摘要
The term of dose creep describes the phenomenon of being unaware of increasing the radiation dose to pursue better image quality. To verify this phenomenon, we chose Fuji's FCR system which provides the S number to be a standard value for evaluation. Based on this value, we divided the collected data into three groups which are optimal-, over-, and under-exposure. From January 2020 to March 2022, 8913 S number of KUB views were gathered, and in the following six months, we improved the radiation dose control. During the six months, 1669 S number of KUB views were gathered. Furthermore, we analyzed these data in two directions. One of them is directly using the S number to determine whether the phenomenon of dose creep exists and to observe the results of amelioration. Another is based on the S number to calculate the number of times which was belonged to optimal-, over-, and under-exposure. Compared with the results of the data gathering phase, we could analyze the effect of amelioration. In the results, although we did not observe the phenomenon of dose creep in our department and the average value of S number was roughly kept at the same level, we had been able to reduce the number of non-optimal exposure times.
並列摘要
劑量潛變一詞所描述的是為了追求更好的影像品質，而在不經意中增加了所使用的輻射劑量。為了驗證此一現象的存在與否，我們選擇使用富士的FCR系統，此系統提供了S值作為評估的標準。基於這個數值，我們把搜集的數據資料分成適當暴露、過度暴露及暴露不足三組。從2020年1月到2022年3月，總共蒐集8913筆的KUB之S值。接著我們進行六個月的輻射劑量改善期，在這6個月當中則有1669筆KUB的S值。我們將這些資料更進一步的以兩個方向做分析，首先我們直接使用S值來觀察劑量潛變的現象是否存在，並了解改善的結果。另外一方面，則是利用S值來決定單筆檢查屬於適當暴露、過度暴露及暴露不足中的哪一組，並計算出各組的次數。藉此比較資料搜集期跟改善期各組的次數，進而分析改善的效果。根據結果而言，雖然我們並沒有觀察到在我們部門當中有劑量潛變的現象，每月的平均S值大約都維持在相同的水準範圍，但我們能夠減少不適當暴露的次數。