{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T18:01:05Z","timestamp":1791396065750,"version":"4.3.3"},"reference-count":40,"publisher":"Oxford University Press (OUP)","license":[{"start":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T00:00:00Z","timestamp":1791331200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/pages\/standard-publication-reuse-rights"}],"funder":[{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["24\u00a0K10828"],"award-info":[{"award-number":["24\u00a0K10828"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>This study evaluated fetal-region doses and dose distributions for X-ray pelvimetry (Guthmann and Martius methods) using exposure conditions from a nationwide survey in Japan and compared them with those of a low-dose computed tomography (CT) protocol using a realistic late-pregnancy phantom. A pregnancy model phantom combining an anthropomorphic phantom with a custom-made abdominal phantom was used. Real-time dosimeters were placed at 18 sites across three abdominal levels. The low-dose CT protocol showed a nearly uniform fetal-region dose distribution, whereas the X-ray methods showed heterogeneous distributions depending on beam direction and irradiation field. The reported mean fetal-region doses were 1.16\u00a0mGy for Guthmann, 4.05\u00a0mGy for Martius, 5.21\u00a0mGy for the combined X-ray examinations, and 0.69\u00a0mGy for low-dose CT. These results indicate that the low-dose CT protocol evaluated in this study produced a lower fetal-region dose than the Guthmann and Martius methods evaluated in this study.<\/jats:p>","DOI":"10.1093\/rpd\/ncag119","type":"journal-article","created":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T19:25:48Z","timestamp":1789673148000},"source":"Crossref","is-referenced-by-count":0,"title":["Measured fetal-region dose in X-ray pelvimetry and low-dose computed tomography using a realistic pregnant phantom: a comparative study"],"prefix":"10.1093","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2356-9385","authenticated-orcid":false,"given":"Yuta","family":"Matsunaga","sequence":"first","affiliation":[{"name":"School of Medical Sciences, Fujita Health University , 1-98, Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470-1192 ,","place":["Japan"]},{"name":"Department of Radiological Technology, Faculty of Health Sciences, Tohoku University Graduate School of Medicine , 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575 ,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0273-0755","authenticated-orcid":false,"given":"Masanao","family":"Kobayashi","sequence":"additional","affiliation":[{"name":"School of Medical Sciences, Fujita Health University , 1-98, Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470-1192 ,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0913-2777","authenticated-orcid":false,"given":"Koichi","family":"Chida","sequence":"additional","affiliation":[{"name":"Department of Radiological Technology, Faculty of Health Sciences, Tohoku University Graduate School of Medicine , 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575 ,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9559-4811","authenticated-orcid":false,"given":"Yasuki","family":"Asada","sequence":"additional","affiliation":[{"name":"School of Medical Sciences, Fujita Health University , 1-98, Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470-1192 ,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2026,10,7]]},"reference":[{"key":"2026100713360224100_ref1","first-page":"N154","article-title":"Diagnosis and management of CPD, acta Obstet","volume":"41","author":"Iwasaki","year":"1989","journal-title":"Gynaecol Jpn"},{"key":"2026100713360224100_ref2","doi-asserted-by":"publisher","first-page":"1","DOI":"10.21203\/rs.3.rs-4849671\/v1","article-title":"Prevalence, and associated factors of cephalopelvic disproportion among pregnant women attending delivery Services at Wachemo University, Nigist Elleni Mohammed 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