乳房攝影對於其他組織輻射劑量影響評估

Evaluations of Radiation Dose with Others Organ in Patients with Mammography

錢信德(Hsin-Te Chian) ； 林芮祁(Reui-Chi Lin) ； 蔡宛庭(Wan-Ting Tsai) ； 柯雅芬(Ya-Fen Ko) ； 吳芝瑩(Chih-Ying Wu) ； 楊雅雯(Ya-Wen Yang) ； 洪思穎(Szu-Ying Hung) ； 董尚倫(Shang-Lung Dong)

《臺灣醫事放射期刊》 5卷2期 (2017/12) Pp. 1-6

https://doi.org/10.6717/JTMRT.201712_5(2).0001

摘要

近年來，數位式乳房X光機已廣泛地運用在乳房攝影檢查。在進行乳房攝影檢查時，乳房主要為直接受照射的器官，除此之外其餘各器官也會受到直接或間接的照射，因此除了評估乳腺所接受到的輻射劑量外，也必須注意到主射束之外散射輻射劑量對於其他器官劑量的影響。本研究將熱發光劑量計(thermoluminescent dosimeter, TLD)黏貼於人形假體表面，依照器官相對位置佈點，評估乳房及甲狀腺與性腺於乳房攝影中劑量分布情形。使用GE Senographe 2000D的數位式乳房攝影X光機進行實驗，右側頭尾向(right craniocaudal, RCC)與右側斜位向(rightmediolateral oblique, RMLO)攝影時右側乳房之表面劑量分別為10.811±0.703與11.261±1.553 mGy，兩者劑量非常接近，此乃因本研究中RCC view與RMLO view攝影時，採用相同的攝影條件，同時乳房壓迫厚度也相同。有關散射劑量在RCC攝影，左側乳房、右甲狀腺、左甲狀腺與性腺TLD量測輻射劑量分別為0.130±0.055、0.044±0.014、0.012±0.005與0.010±0.009 mGy；在RMLO view攝影時，左側乳房、右甲狀腺、左甲狀腺與性腺TLD量測輻射劑量分別為0.037±0.011、0.035±0.010、0.014±0.005與0.040±0.002 mGy。本研究量測結果於對側乳房、甲狀腺與性腺散射輻射劑量皆遠低於攝影部位之乳房劑量，因此在常規乳房攝影程序中接受RCC、LCC、RMLO與LMLO共四次的攝影，其照野外散射劑量應不致造成其他器官劑量過高之疑慮。

關鍵字

乳房攝影 ； 甲狀腺 ； 性腺 ； 輻射劑量

並列摘要

In recent years, digital mammography is widely applied in the examination. Breasts are the main organs that are directly photographed under the examination of mammography. In addition, other organs of a patient are directly or indirectly exposed. Breasts are photographed by digital mammography system in order to evaluate the distribution of the dose of mammography to breasts, thyroids, gonads. Using the digital mammography (GE Senographe 2000D), the standard of dose response curve must be set up through TLD under the evaluation of radiation dose. Right craniocaudal (RCC) and right mediolateraloblique (RMLO) its surface doses are 10.811±0.703 and 11.261±1.553 mGy respectively. As to the dose of scattering radiation, the left side of breast, the dose of TLD of the right side of thyroid, the left side of thyroid and gonads in the photography of RCC view are 0.130±0.055, 0.044±0.014, 0. 012±0.005 and 0.010±0.009 mGy respectively; the dose of TLD of the right side of thyroid, the left side of thyroid and gonads in the photography of RMLO view are 0.037±0.011, 0.035±+0.010, 0.014±0.005 and 0.040±0.002 mGy respectively. In this research, the dose of scattering radiation in the application of TLD to measure contralateral breast, thyroids, and gonads is much lower than that of the surface of photographed breast. Accordingly, the organs exposed to the dose of the scattering radiation in a process of a regular breast photography that covers RCC, LCC, RMLO and LMLO does not result in excessive dose.

並列關鍵字

Mammography ； Thyroids ； Gonads ； Radiation dose