Taheri M, Movafeghi A, Rastkhah N
National Radiation Protection Department, Iranian Nuclear Regulatory Authority, Tehran, Iran.
Radiat Prot Dosimetry. 2011 Mar;144(1-4):239-42. doi: 10.1093/rpd/ncq553. Epub 2011 Jan 2.
In this research work, a semi-automatic densitometry system has been developed for large-scale monitoring services by use of film badge dosemeters. The system consists of a charge-coupled device (CCD)-based scanner that can scan optical densities (ODs) up to 4.2, a computer vision algorithm to improve the quality of digitised films and an analyser program to calculate the necessary information, e.g. the mean OD of region of interest and radiation doses. For calibration of the system, two reference films were used. The Microtek scanner International Color Consortium (ICC) profiler is applied for determining the colour attributes of the scanner accurately and a reference of the density step tablet, Bundesanstalt für Materialforschung und-prüfung (BAM) is used for calibrating the automatic conversion of gray-level values to OD values in the range of 0.2-4.0 OD. The system contributes to achieve more objectives and reliable results. So by applying this system, we can digitise a set of 20 films at once and calculate their relative doses less than about 4 min, and meanwhile it causes to avoid disadvantages of manual process and to enhance the accuracy of dosimetry.
在这项研究工作中，已开发出一种半自动密度测定系统，用于通过使用胶片剂量计进行大规模监测服务。该系统由一个基于电荷耦合器件（CCD）的扫描仪组成，该扫描仪可扫描高达4.2的光学密度（OD），一种用于提高数字化胶片质量的计算机视觉算法，以及一个用于计算必要信息（例如感兴趣区域的平均OD和辐射剂量）的分析程序。为了校准该系统，使用了两张参考胶片。Microtek扫描仪国际色彩联盟（ICC）配置文件用于准确确定扫描仪的颜色属性，密度阶跃片的参考标准，德国联邦材料研究与测试机构（BAM）用于校准灰度值到0.2 - 4.0 OD范围内OD值的自动转换。该系统有助于实现更多目标并获得可靠结果。因此，通过应用此系统，我们可以一次数字化一组20张胶片，并在不到约4分钟的时间内计算出它们的相对剂量，同时避免了手动过程的缺点并提高了剂量测定的准确性。
