Heo Yeong Cheol, Cho Jae Hwan, Han Dong Kyoon
Department of Radiologic Science, College of Health Science, Eulji University, Seongnam, Korea.
Department of Radiological Technology, Ansan University, Ansan, Korea.
J Korean Med Sci. 2017 Jul;32(7):1083-1090. doi: 10.3346/jkms.2017.32.7.1083.
This is a study on the dose-decreasing effect of the first reversed laser beam collimator (RLBC) for C-arm type angiographic equipment. A laser beam was located at the center of each plane at an oblique angle to the angiographic equipment detector. A field of view, which could be seen with the naked eye, was made by focusing the laser beam in the direction of the X-ray source. The height of the table was fixed at 75 cm and the iron balls were located within 2 mm of the top, bottom, left, and right edges of the output image. The time needed for location fixing, fluoroscopy, and measurement of dose area product (DAP) were compared by having 30 radiologists perform location fixing by looking at the fluoroscopic image while performing location fixing (no radiation) and while the RLBC was turned on. In the next test, the time needed for location fixing, fluoroscopy, and DAP were compared when varying the location of the iron balls from 2 to 10 mm from the edges of the output image. The results showed that the time needed for location fixing, the time needed for fluoroscopy, and DAP decreased, both in the first test and the second test. This study confirmed that the use of a RLBC for C-arm type angiographic equipment decreases both the time needed to perform the procedure and the radiation dose received. It is expected that continuous advancement of RLBC technology will contribute greatly to decreasing the dose of radiation needed and improving convenience during angiography.
这是一项关于用于C型臂血管造影设备的首款反向激光束准直器（RLBC）剂量降低效果的研究。一束激光以与血管造影设备探测器成倾斜角度的方式位于每个平面的中心。通过将激光束聚焦在X射线源的方向上形成一个肉眼可见的视野。检查台高度固定在75厘米，铁球位于输出图像顶部、底部、左侧和右侧边缘2毫米范围内。让30名放射科医生在进行定位固定（无辐射）以及RLBC开启时通过观察透视图像进行定位固定，比较定位固定、透视以及剂量面积乘积（DAP）测量所需的时间。在接下来的测试中，当铁球距离输出图像边缘的位置从2毫米变化到10毫米时，比较定位固定、透视以及DAP所需的时间。结果表明，在第一次测试和第二次测试中，定位固定所需时间、透视所需时间以及DAP均有所降低。本研究证实，将RLBC用于C型臂血管造影设备可减少操作所需时间以及所接受的辐射剂量。预计RLBC技术的不断进步将极大有助于减少所需的辐射剂量并提高血管造影过程中的便利性。
