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The ambient dose equivalent was calculated using an optically stimulated luminescence dosemeter at heights of 1600\u00a0mm (eye lens height), 1200\u00a0mm (chest height), and 800\u00a0mm (pelvis height) from the floor. The minimum ambient dose equivalent was observed at 180\u00b0 for the head and at 90\u00b0 for the chest and abdomen. Similar results were obtained when calculating the physician\u2019s upper extremities. The use of a lead shielding drape reduced radiation exposure by 72% on the head, 73% on the chest, and 33% on the pelvis. In CT-guided IVR of the lung, the use of a lead shielding drape and half-scan is important, depending on the procedural situation.<\/jats:p>","DOI":"10.1093\/rpd\/ncag016","type":"journal-article","created":{"date-parts":[[2026,2,6]],"date-time":"2026-02-06T12:53:02Z","timestamp":1770382382000},"page":"793-803","source":"Crossref","is-referenced-by-count":0,"title":["Reducing the radiation exposure of physicians during computed tomography\u2013guided biopsy using an adjustable X-ray beam angular range"],"prefix":"10.1093","volume":"202","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8244-8911","authenticated-orcid":false,"given":"Hiroaki","family":"Hasegawa","sequence":"first","affiliation":[{"name":"School of Health Sciences at Narita, Department of Radiological Sciences, International University of Health and Welfare , 4-3 Kozunomori, Narita, Chiba 286-8686 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