评估辐射防护设备的铅当量作为管电压和光谱成型滤波器的函数。

Evaluation of lead equivalence of radiation protection apparatuses as a function of tube potential and spectral shaping filter.

机构信息

Division of Medical Physics, Department of Radiation Oncology, Virginia Commonwealth University, Richmond, VA, USA.

Department of Radiology, Virginia Commonwealth University, Richmond, VA, USA.

出版信息

J Appl Clin Med Phys. 2019 Dec;20(12):204-209. doi: 10.1002/acm2.12768. Epub 2019 Nov 18.

DOI:10.1002/acm2.12768

PMID:31738469

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6909127/

Abstract

PURPOSE

This study aims to evaluate the lead equivalence (LE) of radiation protective apparatuses under various combinations of tube potentials and spectral shaping filter.

METHOD

In this study, the commercially available 3M™ Lead Foil Tape 421, with nominal lead thickness of 0.1 mm, was employed to determine the LE of four different radiation protective apparatuses. The LE of protective apparatus was determined by utilizing the X-ray transmission curves obtained with the lead foil tape at 60-120 kVp in combination with the spectral shaping filters of 0.1, 0.2, 0.3, 0.6, and 0.9 mmCu. The experimental setup and test method, for the transmission measurements with narrow beam geometry, was performed in accordance to ASTM Designation F2547-18 Standards. All measurements were obtained using cardiovascular interventional angiography system.

RESULTS

A much larger discrepancies between the measured LE and stated (nominal) LE were observed at low tube potential (<70 kVp) for non-lead protective apparatus. At higher tube potentials (>80 kVp) and thicker spectral shaping filters, the measured LE appears to be more consistent with the manufacturer specified nominal thickness for the protective apparatus investigated. On the other hand, for the lead protective eyeglasses, the measured lead equivalence of both the lead side shield and the lens of eyeglasses (0.38 and 0.85 mmPb respectively) are consistent across all tube voltage.

CONCLUSION

The conventional specification of LE without considering spectral shaping filter is a valid measure for tube voltages at and above 80 kVp. The measured LE generally exceed the specifications. The difference is most significant at lower tube potentials, and especially with thicker spectral shaping filters. At higher voltages (>100 kVp), the measured LE and the nominal LE are in good agreement with each other irrespective of the spectral shaping filter thickness.

摘要

目的

本研究旨在评估不同管电压和光谱成型滤光片组合下辐射防护设备的铅当量（LE）。

方法

在这项研究中，使用市售的 3M™Lead Foil Tape 421，标称铅厚度为 0.1mm，来确定四种不同辐射防护设备的 LE。通过利用在 60-120 kVp 下与光谱成型滤光片（0.1、0.2、0.3、0.6 和 0.9mmCu）组合的铅箔带获得的 X 射线透射曲线来确定防护设备的 LE。实验装置和测试方法，用于窄束几何结构的透射测量，是根据 ASTM Designation F2547-18 标准进行的。所有测量均使用心血管介入造影系统进行。

结果

在低管电压（<70kVp）下，对于非铅防护设备，测量的 LE 与标称（名义）LE 之间存在较大差异。在较高管电压（>80kVp）和较厚的光谱成型滤光片下，测量的 LE 似乎更符合所研究的防护设备制造商规定的名义厚度。另一方面，对于铅防护眼镜，眼镜的铅侧屏蔽和镜片的测量铅当量（分别为 0.38 和 0.85mmPb）在所有管电压下都是一致的。