電子的放射線治療照合装置（Ｅｌｅｃｔｒｏｎｉｃ　ｐｏｒｔａｌ　ｉｍａｇｉｎｇ　ｄｅｖｉｃｅ，ＥＰＩＤ）による患者設定誤差の評価

DOI 被引用文献4件 参考文献12件

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  • Evaluation of Patients' Setup Error Using an Electronic Portal Imaging Device.

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An electronic portal imaging device (EPID) has been applied for clinical use at Kyoto University Hospital since 1993. The EPID is a liquid-filled ionization chamber system (Portal Vision, Varian Associates). Portal images of 104 treatment fields from 93 patients were taken using a treatment beam and were verified with simulation images. The range of setup deviation was almost within 5 mm for head and neck, and pelvic fields, while within 10 mm for thoracic fields. In both a transverse direction and a longitudinal direction, the mean setup deviation was larger in thoracic fields than in head and neck, and pelvic fields. There are still some problems to be solved with this EPID system. The time taken for image acquisition is more than 6.5 seconds and the image quality is not satisfactory for accurate verification. However, the real time monitoring of patients' position during treatment which enables quick detection of major setup errors or block placement errors is a great advantage of the EPID. The EPID will play an important role in modern radiation therapy in terms of increasing the accuracy of treatments, although further development of both hardware and software is required.

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