Needle position during 125I seed implantation: accurately recognized by sagittal transrectal ultrasonography期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Needle position during 125I seed implantation: accurately recognized by sagittal transrectal ultrasonography

Authors:	Hiromichi Ishiyama Shouko Kotani Takefumi Satoh Mineko Uemae Shiro Baba Kazushige Hayakawa

Affiliation:	1. Department of Radiology, Kitasato University School of Medicine, 1-15-1 Kitasato, Sagamihara, 228-8555, Japan 2. Department of Urology, Kitasato University School of Medicine, Sagamihara, Japan 3. Division of Radiation Oncology, Kitasato University Hospital, Sagamihara, Japan

Abstract:	Purpose The aim of this study was to assess the variation of probe rotation angles for detecting a single needle using sagittal images of transrectal ultrasonography (TRUS). Materials and methods A phantom study was performed. One needle was inserted through each of 10 holes of the template, and variations in the probe rotation angles for detecting the needle were measured. Results The mean variation of probe rotation for detecting a single needle was 17.0° (range 4°–25°). Slightly broader variation was seen for the needle in holes farther away from the probe. Conclusion Probe rotation angles for detecting a single needle displayed considerable variation. Seed locations recognized on sagittal imaging by TRUS are thus indeterminate, and real-time dose calculations using TRUS for ¹²⁵I seed implantation should be used with care.

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