在放射治疗中，对需设前、后两照射野而又要用铅块来遮挡照射野内正常组织和重要器官的患者，用源皮距照射，摆位时铅块容易放置，但在俯卧位时，由于俯卧不平，身体易向左或向右倾斜，以致身体与治疗床产生角度，使每次摆位重复性差，费时。我院对４３例患者给予等中心照... In radiation therapy, the need to set before and after the two radiation field but also to block the use of lead to block the exposure of normal tissues and vital organs in patients with the source skin from the irradiation, when placed lead easy to place the lead, but in the prone position , Due to prone position, the body is easy to tilt to the left or right, resulting in the body and the treatment bed angle, so that each bit positioning repeatability, time-consuming. 43 patients in our hospital to give equal center photo ...