模拟机是放疗设野的重要工具,但天津理疗仪器厂生产的ＦＭⅠ型模拟定位机在定位时只能看到“+”线和“#”线而没有刻度。设野大小需在皮肤上用尺测量,由于皮肤表面不规则,在测量时会产生误差;同中心定位时野大小是指体内同中心位置的野大小,测量更加困难和不准确。我们设计制作 The simulator is an important tool for radiotherapy field setting, but the FMI analog positioning machine produced by Tianjin Physical Therapy Instrument Factory can only see the “+” line and the “#” line without a scale during positioning. Set the size of the field to be measured on the skin with a ruler. Due to the irregular surface of the skin, an error will occur during measurement. When the center is positioned with the center, the size of the field is the size of the field with the center of the body. Measurement is more difficult and inaccurate. We design