XR-RV3 胶片校准条件对介入放射学中皮肤峰值剂量测量的影响。

Impact of the calibration conditions of XR-RV3 films on peak skin dose measurements in interventional radiology.

作者信息

Greffier J, Van Ngoc Ty C, Agelou M, Coulot J, Ledermann B, Ovtchinnikoff S, Pereira F, Beregi J P, Bonniaud G

机构信息

Department of Radiology, Nîmes University Hospital, Medical Imaging Group Nîmes, EA 2415, Bd Prof Robert Debré 30029 Nîmes Cedex, France.

Esprimed, 1, mail du Pr Georges Mathé, 94800 Villejuif, France.

出版信息

Radiat Prot Dosimetry. 2017 Apr 25;174(2):207-215. doi: 10.1093/rpd/ncw116.

DOI:10.1093/rpd/ncw116

PMID:27150522

Abstract

In this study, the impact of radiochromic films' (XR-RV3) calibration on PSD measurements was investigated under various peak kilovoltage (kVp) and additional filtration conditions. Films were calibrated free-in-air for six beam qualities with Allura Xper FD20 system (Philips). Six calibration curves (CCs) were constructed. Each beam quality was characterized in terms of mean energy (ME) in the air, with table, with table and water phantom using Monte Carlo simulations. A cohort of 155 patient films from cardiology (37) and vascular (118) procedures were read with each CC. Routine calibration beam quality was taken as reference (DoseNorm). Overall, it was observed that for a wider ME difference between the exposed film and the CC used, a larger deviation (from -28% to +41%) was observed. The choice of beam quality for the calibration is a key point when additional filtration and kVp are automatically controlled in clinical conditions.

摘要

在本研究中，研究了在各种峰值千伏（kVp）和附加滤过条件下，放射变色胶片（XR-RV3）校准对表面剂量（PSD）测量的影响。使用Allura Xper FD20系统（飞利浦）在空气中对胶片进行六种射束质的校准。构建了六条校准曲线（CCs）。使用蒙特卡罗模拟，对每种射束质在空气中、有体模、有体模和水模体中的平均能量（ME）进行了表征。使用每条校准曲线读取了来自心脏病学（37例）和血管造影（118例）程序的155份患者胶片。将常规校准射束质作为参考（剂量归一化）。总体而言，观察到对于曝光胶片与所使用校准曲线之间更大的平均能量差异，观察到更大的偏差（从-28%到+41%）。在校准射束质的选择是临床条件下自动控制附加滤过和kVp时的关键点。