{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,6,14]],"date-time":"2025-06-14T15:48:36Z","timestamp":1749916116578},"reference-count":22,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2022,9,19]],"date-time":"2022-09-19T00:00:00Z","timestamp":1663545600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["aapm.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Medical Physics"],"published-print":{"date-parts":[[2022,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>Measurement of the dwell time and moving speed of a high\u2010activity iridium\u2010192 (Ir\u2010192) source used for high\u2010dose\u2010rate (HDR) brachytherapy is important for estimating the precise dose delivery to a tumor. For this purpose, we used a cerium\u2010doped yttrium aluminum perovskite (YA1O<jats:sub>3<\/jats:sub>:YAP(Ce)) gamma camera system, combined with a list\u2010mode data acquisition system that can acquire short\u2010time sequential images, and measured the dwell times and moving speeds of the Ir\u2010192 source.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Gamma photon imaging was conducted using the gamma camera in list mode for the Ir\u2010192 source of HDR brachytherapy with fixed dwell times and positions. The acquired list\u2010mode images were sorted to millisecond\u2010order interval time sequential images to evaluate the dwell time at each position. Time count rate curves were derived to calculate the dwell time at each source position and moving speed of the source.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>We could measure the millisecond\u2010order time sequential images for the Ir\u2010192 source. The measured times for the preset dwell times of 2 s and 10 s were 1.98 to 2.00 s full width at half maximum (FWHM) and 10.0 s FWHM, respectively. The dwell times at the first dwell position were larger than those at other positions. We also measured the moving speeds of the source after the dwells while moving back to the afterloader and found the speed increased with the distance from the edge of the field of view to the last dwell position.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>We conclude that millisecond\u2010order time sequential imaging of the Ir\u2010192 source is possible by using a gamma camera and is useful for evaluating the dwell times and moving speeds of the Ir\u2010192 source.<\/jats:p><\/jats:sec>","DOI":"10.1002\/mp.15957","type":"journal-article","created":{"date-parts":[[2022,9,5]],"date-time":"2022-09-05T13:02:35Z","timestamp":1662382955000},"page":"7703-7714","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Technical note: Short\u2010time sequential high\u2010energy gamma photon imaging using list\u2010mode data acquisition system for high\u2010dose\u2010rate brachytherapy"],"prefix":"10.1002","volume":"49","author":[{"given":"Jura","family":"Nagata","sequence":"first","affiliation":[{"name":"Department of Integrated Health Science Nagoya University Graduate School of Medicine Nagoya Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seiichi","family":"Yamamoto","sequence":"additional","affiliation":[{"name":"Faculty of Science and Engineering Waseda University Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takuya","family":"Yabe","sequence":"additional","affiliation":[{"name":"Department of Integrated Health Science Nagoya University Graduate School of Medicine Nagoya Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Katsunori","family":"Yogo","sequence":"additional","affiliation":[{"name":"Department of Integrated Health Science Nagoya University Graduate School of Medicine Nagoya Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kohei","family":"Nakanishi","sequence":"additional","affiliation":[{"name":"Department of Integrated Health Science Nagoya University Graduate School of Medicine Nagoya Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yumiko","family":"Noguchi","sequence":"additional","affiliation":[{"name":"Department of Radiological Technology Nagoya University Hospital Nagoya Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kuniyasu","family":"Okudaira","sequence":"additional","affiliation":[{"name":"Department of Radiological Technology Nagoya University Hospital Nagoya Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kei","family":"Kamada","sequence":"additional","affiliation":[{"name":"New Industry Creation Hatchery Center (NICHe) Tohoku University Sendai Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Akira","family":"Yoshikawa","sequence":"additional","affiliation":[{"name":"New Industry Creation Hatchery Center (NICHe) Tohoku University Sendai Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jun","family":"Kataoka","sequence":"additional","affiliation":[{"name":"Faculty of Science and Engineering Waseda University Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2022,9,19]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"crossref","unstructured":"AshtonLP CossetJM LevinV et\u00a0al.Prevention of high\u2010dose\u2010rate brachytherapy accidents. in:International Commission on Radiological Protection Publication 97.Annals ICRP2005;35:1\u201051.","DOI":"10.1016\/j.icrp.2005.05.001"},{"key":"e_1_2_8_3_1","unstructured":"NishimuraT.Event reports on high\u2010dose\u2010rate remote afterloader treatment.In: Dokiya T The Guidance Working Group for microSelectron HDR study group Eds High\u2010Dose\u2010Rate Brachytherapy Guidance Using MicroSelectron HDR 2013 (in Japanese). 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