Kudoh H, Masai N, Ichida T, Kubota T, Nakamura K, Yamada R
Department of Radiology, Osaka City University Medical School, Osaka, Japan.
Radiat Med. 1998 May-Jun;16(3):229-32.
Recent advancement in IVR by the catheterization technique has raised the problem of increased X-ray exposure dose. To minimize this problem, we developed an X-ray fluoroscopy system with which the operator can select the X-ray dose according to the required image quality. The optical system features an optical iris that adjusts the amount of light input to the camera tube (the optical iris is usually fixed). If a rough fluoroscopic image with low S/N is acceptable, the optical iris is opened and the fluoroscopic dose is automatically reduced. This reduces exposure dose to 30-60% of the conventional dose.
通过导管插入技术实现的交互式语音应答（IVR）的最新进展引发了X射线照射剂量增加的问题。为了将这个问题降到最低，我们开发了一种X射线荧光透视系统，操作人员可以根据所需的图像质量选择X射线剂量。该光学系统的特点是有一个光学可变光阑，可调节输入摄像管的光量（光学可变光阑通常是固定的）。如果低信噪比的粗略荧光透视图像可以接受，就打开光学可变光阑，荧光透视剂量会自动降低。这样可将照射剂量降低到传统剂量的30%至60%。
