Lutz W R, Bjarngard B E
Int J Radiat Oncol Biol Phys. 1985 Mar;11(3):631-4. doi: 10.1016/0360-3016(85)90200-7.
A test object has been designed for evaluation of the image quality of portal films in high energy photon radiation therapy. It consists of a pattern of notched polyvinyl chloride cylinders, fastened to a plastic sheet and immersed in water during exposure. In a pilot experiment, films produced with the test object were evaluated by a panel of observers. The results indicate that the use of the test object simulates the clinical application of portal films well. It is concluded that the test object can simplify studies of the efficacy of various methods to produce and view portal films.
已设计出一种测试物体，用于评估高能光子放射治疗中射野片的图像质量。它由一系列带缺口的聚氯乙烯圆柱体组成，固定在塑料片上，并在曝光期间浸入水中。在一项初步实验中，一组观察者对用该测试物体制作的射野片进行了评估。结果表明，使用该测试物体能很好地模拟射野片的临床应用。得出的结论是，该测试物体可以简化对各种制作和观察射野片方法的效果研究。
