乳房攝影射束品質與劑量評估

近來乳房攝影的品質控制是台灣相當熱門的議題。美國放射線學會所訂定之品質控制作業程序目前亦被相當多的機構或大學所廣為推行，我們知道乳腺組織相較於皮膚、脂肪或乳暈對於放射線較易有致癌的反應，且乳腺往往是最容易引起惡性腫瘤的主要組織，所以有關乳腺劑量必須做個別的計算及監控。由於計算乳腺劑量非常複雜，也因為個體乳房之乳腺密度均不同，所以無法針對臨床之乳房計算出乳腺劑量，因此我們採用美國放射線學會之標準假體並計算乳房表面劑量，藉由不同的靶／濾片組合測得半值層，最後再依表面劑量及半值層求得平均乳腺劑量。應用美國放射線學會的乳腺劑量計算方法，我們可以比較三種不同靶／濾片（鉬／鉬、鉬／銠、鎢／銠）模式的差異性，並且評估其不同及優缺點，最後我們可以驗證正確的參數設定（電壓、靶／濾片）並且可以有效的減少乳腺劑量。

關鍵字

乳房攝影；品質控制；乳腺劑量

並列摘要

Recently mammography quality control issue is more popular in Taiwan. American College of Radiology (ACR) quality control procedures also have been introduced by some institutions or colleges. We know the breast glandular tissue is more vulnerable to radiation carcinogenesis than the skin, adipose tissue, or areola, and also the major tissue which induced tumor cancer, so glandular dose must be calculated and monitored by individual procedure. Due to the complicated calculations in glandular dose, the computed method was simplified by using standard phantom to estimate breast entrance dose in this work. On measuring half value layer, HVL, and entrance dose by using different type of target/filter combination, we compared three modes of target/filter (Mo/Mo, M/Rh, W/Rh) combinations, and evaluated the differences and benefits. Finally, we proved the proper parameter settings (kV、Target/Filter) can reduce large amount of breast dose.

並列關鍵字

mammography ； quality control ； glandular dose

國際替代計量

乳房攝影射束品質與劑量評估

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