Department of Vascular and Interventional Radiology, Baylor University Medical Center, Dallas, Texas 75246, USA.
J Vasc Interv Radiol. 2011 Apr;22(4):437-42. doi: 10.1016/j.jvir.2010.12.016. Epub 2011 Feb 26.
To evaluate the radiation protective characteristics of a system designed to enhance operator protection while eliminating weight to the body and allowing freedom of motion.
Radiation doses to a mock interventionalist were measured with calibrated dosimeters in a clinical interventional suite. A standard lead apron (SLA; Pb equivalent, 0.5 mm) was compared with a suspended radiation protection system (ZeroGravity; Zgrav) that shields from the top of the head to the calves (except the right arm and left forearm) with a complex overhead motion system that eliminates weight on the operator and allows freedom of motion. Zgrav included a suspended lead apron with increased lead equivalency, greater length, proximal left arm and shoulder coverage, and a wraparound face shield of 0.5 mm Pb equivalency. A 26-cm-thick Lucite stack (ie, mock patient) created scatter during 10 controlled angiography sequences of 120 exposures each. Parameters included a field of view of 40 cm, table height of 94 cm, 124 cm from the tube to image intensifier, 50 cm from the image center to operator, 66 kVp, and 466-470 mA.
Under identical conditions, average doses (SLA vs Zgrav) were 264 versus 3.4 (ratio, 78) to left axilla (P < .001), 456 versus 10.2 (ratio, 45) to left eye (P < .001), 379.4 versus 6.6 (ratio, 57) to right eye (P < .005), and 18.8 versus 1.2 (ratio, 16) to gonad (P < .001).
Relative to a conventional lead apron, the Zgrav system provided a 16-78-fold decrease in radiation exposure for a mock interventionalist in a simulated clinical setting.
评估一种旨在增强操作人员保护、减轻身体负担并允许自由运动的系统的辐射防护特性。
在临床介入套房中，使用校准剂量计测量模拟介入医生的辐射剂量。将标准铅围裙（SLA；Pb 当量，0.5 毫米）与悬浮辐射防护系统（ZeroGravity；Zgrav）进行比较，该系统通过复杂的头顶运动系统屏蔽从头顶到小腿（除右臂和左前臂外），消除操作员的重量并允许自由运动。Zgrav 包括一个悬浮铅围裙，具有更高的 Pb 当量、更长的长度、近端左手臂和肩部覆盖范围以及 0.5 毫米 Pb 当量的环绕式面罩。一个 26 厘米厚的有机玻璃堆（即模拟患者）在 10 个 120 次曝光的控制血管造影序列中产生散射。参数包括 40 厘米的视野、94 厘米高的桌子、从管到影像增强器 124 厘米、从影像中心到操作员 50 厘米、66 kVp 和 466-470 mA。
在相同条件下，左侧腋窝的平均剂量（SLA 与 Zgrav）分别为 264 与 3.4（比值，78）（P<0.001），左眼为 456 与 10.2（比值，45）（P<0.001），右眼为 379.4 与 6.6（比值，57）（P<0.005），以及性腺为 18.8 与 1.2（比值，16）（P<0.001）。
与传统的铅围裙相比，在模拟临床环境中，Zgrav 系统为模拟介入医生提供了 16-78 倍的辐射暴露减少。
