=== Generating (published_papers) === === Generating (teaching_experience) === === Generating (committee_memberships) === === Generating (awards) === === Generating (association_memberships) === === Generating (presentations) === ==== begin registerFile(/WWW/pub2/data/ERD/person/338966/researchmap/published_papers.jsonl) ==== line:1, {"insert":{"user_id":"R000044701","type":"published_papers","id":"45581678"},"force":{"see_also":[{"@id":"https://rdcu.be/dyt9b","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/118973","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=405060","label":"url"}],"paper_title":{"en":"Combined visual and quantitative assessment of somatostatin receptor scintigraphy for staging and restaging of neuroendocrine tumors","ja":"Combined visual and quantitative assessment of somatostatin receptor scintigraphy for staging and restaging of neuroendocrine tumors"},"authors":{"en":[{"name":"Yuya UEKI"},{"name":"Otsuka Hideki"},{"name":"Otani Tamaki"},{"name":"Kasai Ryosuke"},{"name":"Otomi Youichi"},{"name":"Ikemitsu Daiki"},{"name":"Azane Shota"},{"name":"Kunikane Yamato"},{"name":"Bandoh Takanori"},{"name":"Matsuda NORITAKE"},{"name":"Okada Yasuyuki"},{"name":"Takayama Tetsuji"},{"name":"Harada Masafumi"}],"ja":[{"name":"植木 勇弥"},{"name":"大塚 秀樹"},{"name":"大谷 環樹"},{"name":"笠井 亮佑"},{"name":"音見 暢一"},{"name":"池光 大貴"},{"name":"阿實 翔太"},{"name":"国金 大和"},{"name":"板東 孝典"},{"name":"松田 憲武"},{"name":"岡田 泰行"},{"name":"高山 哲治"},{"name":"原田 雅史"}]},"publication_date":"2024-02-12","publication_name":{"en":"Japanese Journal of Radiology","ja":"Japanese Journal of Radiology"},"volume":"Vol.42","number":"No.2","languages":["eng"],"referee":true,"identifiers":{"issn":["1867-1071"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:2, {"insert":{"user_id":"R000044701","type":"published_papers","id":"46257842"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=407417","label":"url"}],"paper_title":{"en":"徳島大学病院歯科放射線科における過去10年間のX線撮影件数・内容の分析","ja":"徳島大学病院歯科放射線科における過去10年間のX線撮影件数・内容の分析"},"authors":{"en":[{"name":"Suito Hideki"},{"name":"Hosoki Hidehiko"},{"name":"Kasai Ryosuke"},{"name":"久米 芳生"},{"name":"Yoshihara Hozumi"},{"name":"Yoshida Midori"},{"name":"Maeda Naoki"},{"name":"Honda Eiichi"}],"ja":[{"name":"水頭 英樹"},{"name":"細木 秀彦"},{"name":"笠井 亮佑"},{"name":"久米 芳生"},{"name":"吉原 穂積"},{"name":"吉田 みどり"},{"name":"前田 直樹"},{"name":"誉田 栄一"}]},"publication_date":"2023-09-30","publication_name":{"en":"Dental Radiology","ja":"歯科放射線"},"volume":"Vol.63","number":"No.1","starting_page":"25","ending_page":"34","languages":["jpn"],"referee":true,"identifiers":{"issn":["0389-9705"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:3, {"insert":{"user_id":"R000044701","type":"published_papers","id":"41756145"},"force":{"see_also":[{"@id":"https://www.mdpi.com/2075-4418/13/6/1111#","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/118070","label":"url"},{"@id":"https://www.ncbi.nlm.nih.gov/pubmed/36980419","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=394548","label":"url"}],"paper_title":{"en":"Noise Reduction Using Singular Value Decomposition with Jensen-Shannon Divergence for Coronary Computed Tomography Angiography","ja":"Noise Reduction Using Singular Value Decomposition with Jensen-Shannon Divergence for Coronary Computed Tomography Angiography"},"authors":{"en":[{"name":"Kasai Ryosuke"},{"name":"Otsuka Hideki"}],"ja":[{"name":"笠井 亮佑"},{"name":"大塚 秀樹"}]},"description":{"en":"Coronary computed tomography angiography (CCTA) is widely used due to its improvements in computed tomography (CT) diagnostic performance. Unlike other CT examinations, CCTA requires shorter rotation times of the X-ray tube, improving the temporal resolution and facilitating the imaging of the beating heart in a stationary state. However, reconstructed CT images, including those of the coronary arteries, contain insufficient X-ray photons and considerable noise. In this study, we introduce an image-processing technique for noise reduction using singular value decomposition (SVD) for CCTA images. The threshold of SVD was determined on the basis of minimization of Jensen-Shannon (JS) divergence. Experiments were performed with various numerical phantoms and varying levels of noise to reduce noise in clinical CCTA images using the determined threshold value. The numerical phantoms produced 10% higher-quality images than the conventional noise reduction method when compared on a quantitative SSIM basis. The threshold value determined by minimizing the JS-divergence was found to be useful for efficient noise reduction in actual clinical images, depending on the level of noise.","ja":"Coronary computed tomography angiography (CCTA) is widely used due to its improvements in computed tomography (CT) diagnostic performance. Unlike other CT examinations, CCTA requires shorter rotation times of the X-ray tube, improving the temporal resolution and facilitating the imaging of the beating heart in a stationary state. However, reconstructed CT images, including those of the coronary arteries, contain insufficient X-ray photons and considerable noise. In this study, we introduce an image-processing technique for noise reduction using singular value decomposition (SVD) for CCTA images. The threshold of SVD was determined on the basis of minimization of Jensen-Shannon (JS) divergence. Experiments were performed with various numerical phantoms and varying levels of noise to reduce noise in clinical CCTA images using the determined threshold value. The numerical phantoms produced 10% higher-quality images than the conventional noise reduction method when compared on a quantitative SSIM basis. The threshold value determined by minimizing the JS-divergence was found to be useful for efficient noise reduction in actual clinical images, depending on the level of noise."},"publication_date":"2023-03-13","publication_name":{"en":"Diagnostics","ja":"Diagnostics"},"volume":"Vol.13","number":"No.6","languages":["eng"],"referee":true,"identifiers":{"doi":["10.3390/diagnostics13061111"],"issn":["2075-4418"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:4, {"insert":{"user_id":"R000044701","type":"published_papers","id":"40487476"},"force":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/118919","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=392801","label":"url"}],"paper_title":{"en":"Image reconstruction algorithm using weighted mean of ordered-subsets EM and MART for computed tomography","ja":"Image reconstruction algorithm using weighted mean of ordered-subsets EM and MART for computed tomography"},"authors":{"en":[{"name":"Abou Al-Ola Omar"},{"name":"Kasai Ryosuke"},{"name":"Yamaguchi Yusaku"},{"name":"Kojima Takeshi"},{"name":"Yoshinaga Tetsuya"}],"ja":[{"name":"アボウ アルオラ オマル"},{"name":"笠井 亮佑"},{"name":"山口 雄作"},{"name":"兒島 雄志"},{"name":"吉永 哲哉"}]},"publication_date":"2022-11-14","publication_name":{"en":"Mathematics","ja":"Mathematics"},"volume":"Vol.10","number":"No.22","starting_page":"4277","ending_page":"4277","languages":["eng"],"referee":true,"identifiers":{"doi":["10.3390/math10224277"],"issn":["2227-7390"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:5, {"insert":{"user_id":"R000044701","type":"published_papers","id":"40393915"},"force":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/117228","label":"url"},{"@id":"https://www.ncbi.nlm.nih.gov/pubmed/34931431","label":"url"},{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-85121471034&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=383337","label":"url"}],"paper_title":{"en":"Differences in image density adjustment parameters on the image matching accuracy of a floor-mounted kV X-ray image-guided radiation therapy system","ja":"Differences in image density adjustment parameters on the image matching accuracy of a floor-mounted kV X-ray image-guided radiation therapy system"},"authors":{"en":[{"name":"Sakuragawa Kanako"},{"name":"Sasaki Motoharu"},{"name":"Kamomae Takeshi"},{"name":"Michihiro Yokoishi"},{"name":"Kasai Ryosuke"},{"name":"Akimi KAJINO"},{"name":"Ikushima Hitoshi"}],"ja":[{"name":"櫻川 加奈子"},{"name":"佐々木 幹治"},{"name":"加茂前 健"},{"name":"Michihiro Yokoishi"},{"name":"笠井 亮佑"},{"name":"梶野 晃未"},{"name":"生島 仁史"}]},"description":{"en":"This study aimed to investigate the effect of two different image density adjustment parameters on the results of image matching at six degrees of freedom using radiographic images generated by the ExacTrac X-ray system in brain stereotactic radiosurgery (SRS). This study comprised 32 patients who underwent brain SRS at our hospital from January 2020 to December 2020. In this study, (1) the default parameter (an image density parameter between \"tissue\" and \"bone\") was an image density parameter for digitally reconstructed radiograph (DRR) generation used at many facilities, and (2) the bone parameter was the steepest contrast parameter used at our hospital. Of the 32 patients, 24 (75%) had a couch angle of 0.5 mm or more in the translational direction or 0.5° or more in the rotational direction, and 10 (31%) had a couch angle of 1.0 mm or more in the translational direction or 1.0° or more in the rotational direction. Among the 131 cases of all couch angles, 46 (35%) cases had a translational direction of 0.5 mm or more or a rotational direction of 0.5° or more, and 15 (11%) had a translational direction of 1.0 mm or more or a rotational direction of 1.0° or more. The results of this study indicate the usefulness of using appropriate DRR parameters for each case, rather than using the default settings. The use of appropriate DRR parameters can lead to accurate position matching results, leading to fewer image-guided radiation therapy shots and a lower imaging dose.","ja":"This study aimed to investigate the effect of two different image density adjustment parameters on the results of image matching at six degrees of freedom using radiographic images generated by the ExacTrac X-ray system in brain stereotactic radiosurgery (SRS). This study comprised 32 patients who underwent brain SRS at our hospital from January 2020 to December 2020. In this study, (1) the default parameter (an image density parameter between \"tissue\" and \"bone\") was an image density parameter for digitally reconstructed radiograph (DRR) generation used at many facilities, and (2) the bone parameter was the steepest contrast parameter used at our hospital. Of the 32 patients, 24 (75%) had a couch angle of 0.5 mm or more in the translational direction or 0.5° or more in the rotational direction, and 10 (31%) had a couch angle of 1.0 mm or more in the translational direction or 1.0° or more in the rotational direction. Among the 131 cases of all couch angles, 46 (35%) cases had a translational direction of 0.5 mm or more or a rotational direction of 0.5° or more, and 15 (11%) had a translational direction of 1.0 mm or more or a rotational direction of 1.0° or more. The results of this study indicate the usefulness of using appropriate DRR parameters for each case, rather than using the default settings. The use of appropriate DRR parameters can lead to accurate position matching results, leading to fewer image-guided radiation therapy shots and a lower imaging dose."},"publication_date":"2022-02-15","publication_name":{"en":"Journal of Applied Clinical Medical Physics","ja":"Journal of Applied Clinical Medical Physics"},"volume":"Vol.23","number":"No.2","starting_page":"e13505","ending_page":"e13505","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1002/acm2.13505"],"issn":["1526-9914"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:6, {"insert":{"user_id":"R000044701","type":"published_papers","id":"40393916"},"force":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/116149","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=377543","label":"url"}],"paper_title":{"en":"Noise-Robust Image Reconstruction Based on Minimizing Extended Class of Power-Divergence Measures","ja":"Noise-Robust Image Reconstruction Based on Minimizing Extended Class of Power-Divergence Measures"},"authors":{"en":[{"name":"Kasai Ryosuke"},{"name":"Yamaguchi Yusaku"},{"name":"Kojima Takeshi"},{"name":"Abou Al-Ola Omar"},{"name":"Yoshinaga Tetsuya"}],"ja":[{"name":"笠井 亮佑"},{"name":"山口 雄作"},{"name":"兒島 雄志"},{"name":"アボウ アルオラ オマル"},{"name":"吉永 哲哉"}]},"publication_date":"2021-07","publication_name":{"en":"Entropy","ja":"Entropy"},"volume":"Vol.23","number":"No.8","starting_page":"1","ending_page":"16","languages":["eng"],"referee":true,"identifiers":{"doi":["10.3390/e23081005"],"issn":["1099-4300"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:7, {"insert":{"user_id":"R000044701","type":"published_papers","id":"40393917"},"force":{"see_also":[{"@id":"https://doi.org/10.2299/jsp.24.183","label":"url"},{"@id":"https://cir.nii.ac.jp/crid/1390566775151534976/","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=366746","label":"url"}],"paper_title":{"en":"Hybrid Euler method for discretizing continuous-time tomographic dynamical system","ja":"Hybrid Euler method for discretizing continuous-time tomographic dynamical system"},"authors":{"en":[{"name":"Kasai Ryosuke"},{"name":"Yamaguchi Yusaku"},{"name":"Kojima Takeshi"},{"name":"Yoshinaga Tetsuya"}],"ja":[{"name":"笠井 亮佑"},{"name":"山口 雄作"},{"name":"兒島 雄志"},{"name":"吉永 哲哉"}]},"publication_date":"2020-07-15","publication_name":{"en":"Journal of Signal Processing","ja":"Journal of Signal Processing"},"volume":"Vol.24","number":"No.4","starting_page":"183","ending_page":"186","languages":["eng"],"referee":true,"identifiers":{"doi":["10.2299/jsp.24.183"],"issn":["1880-1013"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:8, {"insert":{"user_id":"R000044701","type":"published_papers","id":"40393918"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=363557","label":"url"}],"paper_title":{"en":"Hybrid Euler method for discretizing continuous-time tomographic dynamical system","ja":"Hybrid Euler method for discretizing continuous-time tomographic dynamical system"},"authors":{"en":[{"name":"Kasai Ryosuke"},{"name":"Yamaguchi Yusaku"},{"name":"Kojima Takeshi"},{"name":"Yoshinaga Tetsuya"}],"ja":[{"name":"笠井 亮佑"},{"name":"山口 雄作"},{"name":"兒島 雄志"},{"name":"吉永 哲哉"}]},"publication_date":"2020-02-21","publication_name":{"en":"Proc. of NCSP'20","ja":"Proc. of NCSP'20"},"starting_page":"73","ending_page":"76","languages":["eng"],"referee":true,"published_paper_type":"scientific_journal"},"priority":"input_data"} line:9, {"insert":{"user_id":"R000044701","type":"published_papers","id":"40393919"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=360639","label":"url"}],"paper_title":{"en":"Continuous-time image reconstruction based on Hellinger distance minimization for medical X-ray CT imaging","ja":"Continuous-time image reconstruction based on Hellinger distance minimization for medical X-ray CT imaging"},"authors":{"en":[{"name":"Yamaguchi Yusaku"},{"name":"Kudo Moe"},{"name":"Kasai Ryosuke"},{"name":"Kojima Takeshi"},{"name":"Yoshinaga Tetsuya"}],"ja":[{"name":"山口 雄作"},{"name":"工藤 萌"},{"name":"笠井 亮佑"},{"name":"兒島 雄志"},{"name":"吉永 哲哉"}]},"publication_date":"2019-10-22","publication_name":{"en":"Basic & Clinical Pharmacology & Toxicology (Abstracts)","ja":"Basic & Clinical Pharmacology & Toxicology (Abstracts)"},"volume":"Vol.125","number":"No.S5","starting_page":"30","ending_page":"31","languages":["eng"],"referee":true,"published_paper_type":"scientific_journal"},"priority":"input_data"} line:10, {"insert":{"user_id":"R000044701","type":"published_papers","id":"40393920"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=360637","label":"url"}],"paper_title":{"en":"Hybrid of ML-EM and MART algorithms for X-ray CT image reconstruction","ja":"Hybrid of ML-EM and MART algorithms for X-ray CT image reconstruction"},"authors":{"en":[{"name":"Kasai Ryosuke"},{"name":"Yamaguchi Yusaku"},{"name":"Kojima Takeshi"},{"name":"Yoshinaga Tetsuya"}],"ja":[{"name":"笠井 亮佑"},{"name":"山口 雄作"},{"name":"兒島 雄志"},{"name":"吉永 哲哉"}]},"publication_date":"2019-10-22","publication_name":{"en":"Basic & Clinical Pharmacology & Toxicology (Abstracts)","ja":"Basic & Clinical Pharmacology & Toxicology (Abstracts)"},"volume":"Vol.125","number":"No.S5","starting_page":"31","ending_page":"32","languages":["eng"],"referee":true,"published_paper_type":"scientific_journal"},"priority":"input_data"} line:11, {"insert":{"user_id":"R000044701","type":"published_papers","id":"40393921"},"force":{"see_also":[{"@id":"https://doi.org/10.1117/12.2521185","label":"url"},{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-85063894959&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=350244","label":"url"}],"paper_title":{"en":"Hybrid algorithm of maximum-likelihood expectation-maximization and multiplicative algebraic reconstruction technique for iterative tomographic image reconstruction","ja":"Hybrid algorithm of maximum-likelihood expectation-maximization and multiplicative algebraic reconstruction technique for iterative tomographic image reconstruction"},"authors":{"en":[{"name":"Kasai Ryosuke"},{"name":"Yamaguchi Yusaku"},{"name":"Kojima Takeshi"},{"name":"Yoshinaga Tetsuya"}],"ja":[{"name":"笠井 亮佑"},{"name":"山口 雄作"},{"name":"兒島 雄志"},{"name":"吉永 哲哉"}]},"publication_date":"2019-03-22","publication_name":{"en":"Proceedings Volume 11049, International Workshop on Advanced Image Technology (IWAIT) 2019","ja":"Proceedings Volume 11049, International Workshop on Advanced Image Technology (IWAIT) 2019"},"number":"No.110491F","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1117/12.2521185"],"issn":["0277-786X"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:12, {"insert":{"user_id":"R000044701","type":"published_papers","id":"40393922"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=340529","label":"url"}],"paper_title":{"en":"Direct Dose Measurement of Patients during Pediatric Computed Tomography Examination","ja":"Direct Dose Measurement of Patients during Pediatric Computed Tomography Examination"},"authors":{"en":[{"name":"Hayashi Hiroaki"},{"name":"Tomita Emi"},{"name":"Goto Sota"},{"name":"Kimoto Natsumi"},{"name":"Tada Keiji"},{"name":"Kasai Ryosuke"},{"name":"Kanazawa Yuki"},{"name":"Mihara Yoshiki"},{"name":"Asahara Takashi"},{"name":"Okazaki Tohru"},{"name":"Hashizume Takuya"},{"name":"Cruz LE Vergil"}],"ja":[{"name":"林 裕晃"},{"name":"冨田 恵美"},{"name":"Goto Sota"},{"name":"紀本 夏実"},{"name":"Tada Keiji"},{"name":"笠井 亮佑"},{"name":"金澤 裕樹"},{"name":"Mihara Yoshiki"},{"name":"Asahara Takashi"},{"name":"Okazaki Tohru"},{"name":"Hashizume Takuya"},{"name":"Cruz LE Vergil"}]},"publication_date":"2019-01","publication_name":{"en":"Progress in Nuclear Science and Technology","ja":"Progress in Nuclear Science and Technology"},"volume":"Vol.6","starting_page":"18","ending_page":"21","languages":["eng"],"referee":true,"identifiers":{"doi":["10.15669/pnst.6.18"],"issn":["2185-4823"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:13, {"insert":{"user_id":"R000044701","type":"published_papers","id":"40393923"},"force":{"see_also":[{"@id":"https://doi.org/10.1155/2018/8973131","label":"url"},{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/114383","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=340048","label":"url"}],"paper_title":{"en":"Tomographic image reconstruction based on minimization of symmetrized Kullback-Leibler divergence","ja":"Tomographic image reconstruction based on minimization of symmetrized Kullback-Leibler divergence"},"authors":{"en":[{"name":"Kasai Ryosuke"},{"name":"Yamaguchi Yusaku"},{"name":"Kojima Takeshi"},{"name":"Yoshinaga Tetsuya"}],"ja":[{"name":"笠井 亮佑"},{"name":"山口 雄作"},{"name":"兒島 雄志"},{"name":"吉永 哲哉"}]},"publication_date":"2018-07-17","publication_name":{"en":"Mathematical Problems in Engineering","ja":"Mathematical Problems in Engineering"},"volume":"Vol.2018","number":"No.Article ID 8973131","starting_page":"9","ending_page":"pages","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1155/2018/8973131"],"issn":["1024-123X"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:14, {"insert":{"user_id":"R000044701","type":"published_papers","id":"40393924"},"force":{"see_also":[{"@id":"https://www.ncbi.nlm.nih.gov/pubmed/28824089","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=339476","label":"url"}],"paper_title":{"en":"Application of Hamiltonian Monte Carlo Method to Metal Artifact Quantitative Evaluation in Computed Tomography (CT)","ja":"Computed tomography (CT) で生じる金属アーチファクト定量評価へのハミルトニアンモンテカルロ法の適用"},"authors":{"en":[{"name":"Kasai Ryosuke"},{"name":"Yamada Kenji"}],"ja":[{"name":"笠井 亮佑"},{"name":"山田 健二"}]},"description":{"en":"In this study, we propose an evaluation method for Bayesian estimation of Gumbel distribution parameters by the Hamiltonian Monte Carlo method (HMC method), with changing the pixel size of the CT image to investigate streak artifacts, without using a significant difference test. Placed a titanium endcap in the center of the CT dose index (CTDI) measurement phantom and got the CT image by changing the display-field of view (D-FOV) to S, M, L, LL. We compared Gumbel distribution parameters with conventional estimation method and Bayesian estimation method using HMC method. In addition, we evaluated streak artifacts by Bayesian statistical analysis. The difference in streak artifact between D-FOV was more than 90% except between D-FOV M and L. The effect of streak artifacts is small as the pixel size was small. By using the HMC method, we can estimate the Gumbel distribution parameters accurately and objectively, and quantitatively evaluated that the streak artifacts differ in pixel size using Bayesian statistical analysis.","ja":"In this study, we propose an evaluation method for Bayesian estimation of Gumbel distribution parameters by the Hamiltonian Monte Carlo method (HMC method), with changing the pixel size of the CT image to investigate streak artifacts, without using a significant difference test. Placed a titanium endcap in the center of the CT dose index (CTDI) measurement phantom and got the CT image by changing the display-field of view (D-FOV) to S, M, L, LL. We compared Gumbel distribution parameters with conventional estimation method and Bayesian estimation method using HMC method. In addition, we evaluated streak artifacts by Bayesian statistical analysis. The difference in streak artifact between D-FOV was more than 90% except between D-FOV M and L. The effect of streak artifacts is small as the pixel size was small. By using the HMC method, we can estimate the Gumbel distribution parameters accurately and objectively, and quantitatively evaluated that the streak artifacts differ in pixel size using Bayesian statistical analysis."},"publication_date":"2017-06-10","publication_name":{"en":"Japanese Journal of Radiological Technology","ja":"日本放射線技術学会雑誌"},"volume":"Vol.73","number":"No.8","starting_page":"654","ending_page":"663","languages":["jpn"],"referee":true,"identifiers":{"doi":["10.6009/jjrt.2017_JSRT_73.8.654"],"issn":["0369-4305"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:15, {"insert":{"user_id":"R000044701","type":"published_papers","id":"40393925"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=340531","label":"url"}],"paper_title":{"en":"Basic study for internal dose evaluation during CT examination by means of small-type OSL dosimeter","ja":"Basic study for internal dose evaluation during CT examination by means of small-type OSL dosimeter"},"authors":{"en":[{"name":"Mihara Yoshiki"},{"name":"Hayashi Hiroaki"},{"name":"Yamada Kenji"},{"name":"Kanazawa Yuki"},{"name":"Higashino Kousaku"},{"name":"Yamashita Kazuta"},{"name":"Kasai Ryosuke"},{"name":"Okazaki Tohru"},{"name":"Hashizume Takuya"}],"ja":[{"name":"Mihara Yoshiki"},{"name":"林 裕晃"},{"name":"Yamada Kenji"},{"name":"金澤 裕樹"},{"name":"東野 恒作"},{"name":"Yamashita Kazuta"},{"name":"笠井 亮佑"},{"name":"Okazaki Tohru"},{"name":"Hashizume Takuya"}]},"description":{"en":"[Aims and objectives] We plan to manage the patient dose exposure during computed tomography (CT) examination using a small-type OSL dosimeter. The OSL dosimeter can measure entrance skin dose (ESD) directly, but the internal dose can't be measured. The aim of this study is to clarify the relationship between the ESD and internal dose during the CT examination. [Methods and materials] We constructed an abdominal phantom, in which OSL dosimeters can be implanted in, and used this phantom to measure external and internal doses during CT examination. The typical irradiation conditions were as follow, 64 rows of detectors, 120 kV, 600 mA, PF (pitch factor) = 1.484 in helical scan mode. Additionally, we analyzed the contribution of X-rays, which were generated from different angles to the dosimeter; namely, angular dependences of 0-360 degrees at 45 degree intervals were evaluated experimentally. [Results] The ESDs and internal doses showed similar values, however the deviations between them were completely different; maximum deviation of ESD was found to be 30% and that of internal dose was at the most 5%. The deviation in ESDs is explained by the phenomenon in which some dosimeters were irradiated by direct X-ray and others were not. However, the small deviation between internal doses was explained by the phenomenon in which dosimeters were mainly irradiated by scattered X-rays. [Conclusion] In this study, we analyzed the relationship between ESD and internal dose for direct dose measurement of patient dose undergoing CT examination. The ESDs show relatively large fluctuations, on the other hand, the internal doses show small deviations.","ja":"[Aims and objectives] We plan to manage the patient dose exposure during computed tomography (CT) examination using a small-type OSL dosimeter. The OSL dosimeter can measure entrance skin dose (ESD) directly, but the internal dose can't be measured. The aim of this study is to clarify the relationship between the ESD and internal dose during the CT examination. [Methods and materials] We constructed an abdominal phantom, in which OSL dosimeters can be implanted in, and used this phantom to measure external and internal doses during CT examination. The typical irradiation conditions were as follow, 64 rows of detectors, 120 kV, 600 mA, PF (pitch factor) = 1.484 in helical scan mode. Additionally, we analyzed the contribution of X-rays, which were generated from different angles to the dosimeter; namely, angular dependences of 0-360 degrees at 45 degree intervals were evaluated experimentally. [Results] The ESDs and internal doses showed similar values, however the deviations between them were completely different; maximum deviation of ESD was found to be 30% and that of internal dose was at the most 5%. The deviation in ESDs is explained by the phenomenon in which some dosimeters were irradiated by direct X-ray and others were not. However, the small deviation between internal doses was explained by the phenomenon in which dosimeters were mainly irradiated by scattered X-rays. [Conclusion] In this study, we analyzed the relationship between ESD and internal dose for direct dose measurement of patient dose undergoing CT examination. The ESDs show relatively large fluctuations, on the other hand, the internal doses show small deviations."},"publication_date":"2017-03","publication_name":{"en":"European Congress of Radiology","ja":"European Congress of Radiology"},"starting_page":"C-0005-1","ending_page":"C-0005-22","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1594/ecr2017/C-0005"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:16, {"insert":{"user_id":"R000044701","type":"published_papers","id":"41756146"},"force":{"see_also":[{"@id":"https://repo.lib.tokushima-u.ac.jp/ja/112388","label":"url"},{"@id":"https://www.ncbi.nlm.nih.gov/pubmed/28497053","label":"url"},{"@id":"https://www.scopus.com/record/display.url?eid=2-s2.0-85018836337&origin=inward","label":"url"},{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=330275","label":"url"}],"paper_title":{"en":"Numerical Evaluation of Image Contrast for Thicker and Thinner Objects among Current Intraoral Digital Imaging Systems.","ja":"Numerical Evaluation of Image Contrast for Thicker and Thinner Objects among Current Intraoral Digital Imaging Systems."},"authors":{"en":[{"name":"Dashupuntsag Oyunbat"},{"name":"Yoshida Midori"},{"name":"Kasai Ryosuke"},{"name":"Maeda Naoki"},{"name":"Hosoki Hidehiko"},{"name":"Honda Eiichi"}],"ja":[{"name":"Dashupuntsag Oyunbat"},{"name":"吉田 みどり"},{"name":"笠井 亮佑"},{"name":"前田 直樹"},{"name":"細木 秀彦"},{"name":"誉田 栄一"}]},"description":{"en":"The purpose is to evaluate the performance of current intraoral digital detectors in detail using a precise phantom and new method. Two aluminum step wedges in 0.5 mm steps were exposed by two photostimulable phosphor plate (PSP) systems-one with automatic exposure compensation (AEC) and the other without AEC-and a CCD sensor. Images were obtained with 3 doses at 60 kV. The effect of metallic material also was evaluated. The contrast-to-noise ratio (CNR) for thinner steps and the low contrast value (LCV) for thicker steps were obtained. The CCD system was the best under all conditions (P < 0.001), although the Gray value was sensitive to the dose, and the Gray value-dose relation varied greatly. The PSP system with AEC was superior to that without AEC for the LCV (P < 0.001) but was inferior to it regarding the CNR (P < 0.001). CNR and LCV in the PSP system without AEC were not affected by the metallic plate. Intraoral digital imaging systems should be chosen according to their diagnostic purpose. PSP system with AEC may be the best for detecting molar proximal caries, whereas the PSP system without AEC may be better for evaluating small bone regeneration in periodontal disease. The CCD system provided the best performance.","ja":"The purpose is to evaluate the performance of current intraoral digital detectors in detail using a precise phantom and new method. Two aluminum step wedges in 0.5 mm steps were exposed by two photostimulable phosphor plate (PSP) systems-one with automatic exposure compensation (AEC) and the other without AEC-and a CCD sensor. Images were obtained with 3 doses at 60 kV. The effect of metallic material also was evaluated. The contrast-to-noise ratio (CNR) for thinner steps and the low contrast value (LCV) for thicker steps were obtained. The CCD system was the best under all conditions (P < 0.001), although the Gray value was sensitive to the dose, and the Gray value-dose relation varied greatly. The PSP system with AEC was superior to that without AEC for the LCV (P < 0.001) but was inferior to it regarding the CNR (P < 0.001). CNR and LCV in the PSP system without AEC were not affected by the metallic plate. Intraoral digital imaging systems should be chosen according to their diagnostic purpose. PSP system with AEC may be the best for detecting molar proximal caries, whereas the PSP system without AEC may be better for evaluating small bone regeneration in periodontal disease. The CCD system provided the best performance."},"publication_date":"2017-03","publication_name":{"en":"BioMed Research International","ja":"BioMed Research International"},"volume":"Vol.2017","starting_page":"5215413","ending_page":"5215413","languages":["eng"],"referee":true,"identifiers":{"doi":["10.1155/2017/5215413"],"issn":["2314-6141"]},"published_paper_type":"scientific_journal"},"priority":"input_data"} line:17, {"insert":{"user_id":"R000044701","type":"published_papers","id":"40393927"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=394539","label":"url"}],"paper_title":{"en":"口内法X線画像用DICOMファイルの規格化および歯科用Viewerの実用化","ja":"口内法X線画像用DICOMファイルの規格化および歯科用Viewerの実用化"},"authors":{"en":[{"name":"Kasai Ryosuke"},{"name":"Yamada Kenji"},{"name":"多田 章久"},{"name":"Hosoki Hidehiko"},{"name":"Maeda Naoki"},{"name":"Yoshida Midori"},{"name":"Honda Eiichi"}],"ja":[{"name":"笠井 亮佑"},{"name":"山田 健二"},{"name":"多田 章久"},{"name":"細木 秀彦"},{"name":"前田 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{"insert":{"user_id":"R000044701","type":"presentations","id":"40393933"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=340533","label":"url"}],"presentation_title":{"en":"Direct Dose Measurement of Patients during Pediatric Computed Tomography Examination","ja":"Direct Dose Measurement of Patients during Pediatric Computed Tomography Examination"},"presenters":{"en":[{"name":"Hayashi Hiroaki"},{"name":"TOMITA Emi"},{"name":"GOTO Sota"},{"name":"KIMOTO Natsumi"},{"name":"TADA Keiji"},{"name":"Kasai Ryosuke"},{"name":"Kanazawa Yuki"},{"name":"MIHARA Yoshiki"},{"name":"ASAHARA Takashi"},{"name":"OKAZAKI Tohru"},{"name":"HASHIZUME Takuya"},{"name":"CRUZ LE Vergil"}],"ja":[{"name":"林 裕晃"},{"name":"TOMITA Emi"},{"name":"GOTO Sota"},{"name":"KIMOTO Natsumi"},{"name":"TADA Keiji"},{"name":"笠井 亮佑"},{"name":"金澤 裕樹"},{"name":"MIHARA Yoshiki"},{"name":"ASAHARA Takashi"},{"name":"OKAZAKI Tohru"},{"name":"HASHIZUME Takuya"},{"name":"CRUZ LE 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The OSL dosimeter can measure entrance skin dose (ESD) directly, but the internal dose can't be measured. The aim of this study is to clarify the relationship between the ESD and internal dose during the CT examination. [Methods and materials] We constructed an abdominal phantom, in which OSL dosimeters can be implanted in, and used this phantom to measure external and internal doses during CT examination. The typical irradiation conditions were as follow, 64 rows of detectors, 120 kV, 600 mA, PF (pitch factor) = 1.484 in helical scan mode. Additionally, we analyzed the contribution of X-rays, which were generated from different angles to the dosimeter; namely, angular dependences of 0-360 degrees at 45 degree intervals were evaluated experimentally. [Results] The ESDs and internal doses showed similar values, however the deviations between them were completely different; maximum deviation of ESD was found to be 30% and that of internal dose was at the most 5%. The deviation in ESDs is explained by the phenomenon in which some dosimeters were irradiated by direct X-ray and others were not. However, the small deviation between internal doses was explained by the phenomenon in which dosimeters were mainly irradiated by scattered X-rays. [Conclusion] In this study, we analyzed the relationship between ESD and internal dose for direct dose measurement of patient dose undergoing CT examination. The ESDs show relatively large fluctuations, on the other hand, the internal doses show small deviations.","ja":"[Aims and objectives] We plan to manage the patient dose exposure during computed tomography (CT) examination using a small-type OSL dosimeter. The OSL dosimeter can measure entrance skin dose (ESD) directly, but the internal dose can't be measured. The aim of this study is to clarify the relationship between the ESD and internal dose during the CT examination. [Methods and materials] We constructed an abdominal phantom, in which OSL dosimeters can be implanted in, and used this phantom to measure external and internal doses during CT examination. The typical irradiation conditions were as follow, 64 rows of detectors, 120 kV, 600 mA, PF (pitch factor) = 1.484 in helical scan mode. Additionally, we analyzed the contribution of X-rays, which were generated from different angles to the dosimeter; namely, angular dependences of 0-360 degrees at 45 degree intervals were evaluated experimentally. [Results] The ESDs and internal doses showed similar values, however the deviations between them were completely different; maximum deviation of ESD was found to be 30% and that of internal dose was at the most 5%. The deviation in ESDs is explained by the phenomenon in which some dosimeters were irradiated by direct X-ray and others were not. However, the small deviation between internal doses was explained by the phenomenon in which dosimeters were mainly irradiated by scattered X-rays. [Conclusion] In this study, we analyzed the relationship between ESD and internal dose for direct dose measurement of patient dose undergoing CT examination. The ESDs show relatively large fluctuations, on the other hand, the internal doses show small deviations."},"is_international_presentation":true},"priority":"input_data"} line:9, {"insert":{"user_id":"R000044701","type":"presentations","id":"40393936"},"force":{"see_also":[{"@id":"https://web.db.tokushima-u.ac.jp/cgi-bin/edb_browse?EID=394529","label":"url"}],"presentation_title":{"en":"Differences of image Quality among Intraoral Detectors","ja":"Differences of image Quality among Intraoral Detectors"},"presenters":{"en":[{"name":"Shantiningsih Raina Rurie"},{"name":"Yoshida Midori"},{"name":"Yanuaryska Dwi Ryna"},{"name":"Kasai Ryosuke"},{"name":"Honda Eiichi"}],"ja":[{"name":"Shantiningsih Raina Rurie"},{"name":"吉田 みどり"},{"name":"RYNA DWI YANUARYSKA"},{"name":"笠井 亮佑"},{"name":"誉田 栄一"}]},"event":{"en":"The 10th ACOMFR 2014 Bali Indonesia","ja":"The 10th ACOMFR 2014 Bali 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