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題 名 | 光激發光劑量計應用於乳房X光攝影之劑量評估=Dose Evaluation of Mammography Using Optically Stimulated Luminescence Dosimeter |
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作 者 | 賴毓嵐; 賴律翰; 林招膨; | 書刊名 | 臺灣應用輻射與同位素雜誌 |
卷 期 | 11:4 2015.12[民104.12] |
頁 次 | 頁1209-1216 |
分類號 | 416.226 |
關鍵詞 | 光激發光劑量計; 乳房X光攝影; 平均乳腺劑量; 皮膚曝露; Optically stimulated luminescence dosimeter; Mammography; Mean glandular dose; Entrance skin exposure; |
語 文 | 中文(Chinese) |
中文摘要 | 乳癌為我國婦女癌症發生率之第一位、死亡率第四位,其依據衛生福利部國民健康署,提供45-69歲婦女兩年一次乳房攝影篩檢,可早期發現、儘早治療並可降低三成乳癌死亡率。乳房X光攝影是使用低X光透視乳房組織的一種檢查,可用來偵測乳房的鈣化點或微小腫瘤,是目前醫學證實最有效的乳癌篩檢工具。因此其影像品質及劑量問題即為本文之研究重點。本文使用平板式游離腔及光激發光劑量計(Optically Stimulated Luminescence Dosimeter, OSLD)作為輻射劑量測量之工具,再由InLightTM MicroStarTM 計讀儀測量。藉由劑量計量測美國放射線醫學會標準假體之入射皮膚曝露(entrance skin exposure, ESE)後,接著利用轉換因子換算成平均乳腺劑量(mean glandular dose, MGD)以評估輻射所致之乳房風險。另外在乳房及壓迫板之間增加bolus降低入射皮膚曝露,研究其降低劑量同時是否影響影像品質。測量結果在光激發光劑量計和平板式游離腔之測量結果相符合,其平均乳腺劑量結果也符合美國放射線醫學會(American College of Radiology, ACR)規定之平均乳腺劑量須低於3 mGy。其增加bolus可有效降低入射皮膚曝露,但影像品質較不加bolus差,但差距在影像判別範圍內可忽視。輻射風險評估結果為每十萬人口0.8-1.05,和2014年衛生福利部統計女性乳癌死亡率之每十萬人口11.94相比,劑量測量之風險評估範圍低於此值,因此民眾可安心的接受乳房X光攝影檢查。 |
英文摘要 | The incidence and mortality of breast cancer is increasing in Taiwan. Taiwan Bureau of National Health Insurance providing women 45 to 69 years old free breast mammogram every two years. It's can early detection, early treatment and reduce breast cancer mortality rate thirty percent. Mammography uses X-ray to examine breast tissue, it can be used to detect breast calcifications or small tumor. Mammography is nowadays the proven useful tool for breast cancer detection. Therefore the image quality and dose are the study purpose. The study used flat panel ionization chamber and optically stimulated luminescence dosimeter (OSLD) as radiation dose measurement tools. OSLD used InLight^(TM) MicroStar^(TM) reader to read the dose. Used dosimeter to measure ACR phantom entrance skin exposure (ESE), then used mean glandular dose (MGD) to evaluate breast radiation risk. The other between the breast and paddle added bolus to reduce the incidence of skin exposure, and research if reduce the dose will affect image quality. OSLD and flat panel ionization chamber measure results are same, and MGD result also conform ACR provision need below 3 mGy. Increased bolus can effectively reduce ESE and the image quality is worse than not added bolus. But the difference is within the range of image discrimination can be ignored. Compared to the radiation risk assessment 0.8-1.05 per 100,000 population and mortality of breast cancer 11.94 per 100,000 populations, the risk assessment of dose measurement range well below this value, so people can be at ease received mammography. |
本系統中英文摘要資訊取自各篇刊載內容。