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放射治療設備的品質保証措施之評估

Evaluation of Quality Assurance Program for Radiotherapy Equipment

摘要


品質保證措施計劃,經過多年的實施後,我們把各項實施的結果,在長期多次例行的品質保證措施檢討會中加以討論,並交由相關人員去配合改善。品質保證措施檢討會從1985年開始實施,我們收集至1992年之資料,把這些記錄結論中之每日、每週、每月、每半年及每年所做的結果,按照各臺機器超過標準值的次數予以統計並探討原因,其中以雷射定位器出現異常的次數最多,機器的輸出亦有相當高的頻率超出標準值,在安全性測試中曾發現緊急按鈕失效,凡此種種問題本篇將加以探討說明,並提出改進方式。

並列摘要


A quality assurance (QA) program was established on the basis of the current standards established by the American Association of Medical Physicists, and thorough accumulated experience here, including the frequency of checking items daily, weekly, monthly, semiannually and annually. Criteria of acceptable range for each item were established. The results of the QA program were accumulated, and a regular quality assurance meeting was held every quarter. This was organized by medical physicists to include engineers, technologists and physicians. Complete calibration data was reviewed at these meetings. Full scale QA data, accumulated over the past eight years, were analyzed and evaluated. These results showed any weakness and the main sources of error, enabling rectification and removed of their causes. Most frequently, laser alignment did not meet criteria. The output of linear accelerators was also abnormal many times. The emergency off-button had failed, too. These and several other items were carefully reviewed and corrected in a timely fashion.

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