Estimating organ dose with optimized peak dose index in cone-beam CT scans

Tomonobu Haba, Yusei Nishihara, Yasunori Saito, Takeshi Tomimura, Shuta Ogawa, Kaho Tanabe, Yasuki Asada, Masanao Kobayashi, Shuji Koyama

研究成果: ジャーナルへの寄稿学術論文査読

4 被引用数 (Scopus)

抄録

Purpose: Organ dose evaluation is important for optimizing cone beam computed tomography (CBCT) scan protocols. However, an evaluation method for various CBCT scanners is yet to be established. In this study, we developed scanner-independent conversion coefficients to estimate organ doses using appropriate peak dose (f(0)) indices. Methods: This study included various scanners (angiography scanners and linear accelerators) and protocols for the head and body (thorax, abdomen, and pelvis) scan regions. f(0) was measured at five conventional positions (center position (f(0)c) and four peripheral positions (f(0)p) at 90° intervals) in the CT dose index (CTDI) phantom. To identify appropriate measurement positions for organ dose estimation, various f(0) indices were considered. Organ doses were measured by using optically stimulated luminescence dosimeters positioned in an anthropomorphic phantom. Thereafter, the conversion coefficients were calculated from each obtained f(0) value and organ or tissue dose using a linear fit for all scanners, and the coefficient of variation (CV) of the conversion coefficients was calculated for each organ or tissue. The f(0) index with the minimum CV value was proposed as the appropriate index. Results: The appropriate f(0) index was determined as f(0)c for the body region and a maximum of four f(0)p values for the head region. Using the proposed conversion coefficients based on the appropriate f(0) index, the organ/tissue doses were well estimated with a mean error of 14.2% across all scanners and scan regions. Conclusions: The proposed scanner-independent coefficients are useful for organ dose evaluation using CBCT scanners.

本文言語英語
論文番号103215
ジャーナルPhysica Medica
118
DOI
出版ステータス出版済み - 02-2024

All Science Journal Classification (ASJC) codes

  • 生物理学
  • 放射線学、核医学およびイメージング
  • 物理学および天文学一般

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