Akhilesh Philomina, Kulkarni Arti R, Jamhale Shramika H, Sharma S D, Kumar Rajesh, Datta D
Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, CT&CRS Building, Anushaktinagar, Mumbai 400094, India.
Radiological Safety Division, Atomic Energy Regulatory Board, Niyamak Bhavan, Anushaktinagar, Mumbai 400094, India.
Radiat Prot Dosimetry. 2017 Apr 25;174(2):236-241. doi: 10.1093/rpd/ncw132.
The purpose of this study was to estimate eye lens dose during brain scans in 16-, 64-, 128- and 256-slice multidetector computed tomography (CT) scanners in helical acquisition mode and to test the feasibility of using radiochromic film as eye lens dosemeter during CT scanning. Eye lens dose measurements were performed using Gafchromic XR-QA2 film on a polystyrene head phantom designed with outer dimensions equivalent to the head size of a reference Indian man. The response accuracy of XR-QA2 film was validated by using thermoluminescence dosemeters. The eye lens dose measured using XR-QA2 film on head phantom for plain brain scanning in helical mode ranged from 43.8 to 45.8 mGy. The XR-QA2 film measured dose values were in agreement with TLD measured dose values within a maximum variation of 8.9%. The good correlation between the two data sets confirms the viability of using XR-QA2 film for eye lens dosimetry.
本研究的目的是估计在螺旋采集模式下，16层、64层、128层和256层多排螺旋计算机断层扫描（CT）脑部扫描期间晶状体的剂量，并测试在CT扫描期间使用放射变色胶片作为晶状体剂量计的可行性。使用Gafchromic XR-QA2胶片在一个聚苯乙烯头部模型上进行晶状体剂量测量，该模型的外部尺寸与一名参考印度男性的头部大小相当。通过使用热释光剂量计验证了XR-QA2胶片的响应准确性。在螺旋模式下，使用XR-QA2胶片在头部模型上测量的普通脑部扫描的晶状体剂量范围为43.8至45.8 mGy。XR-QA2胶片测量的剂量值与热释光剂量计测量的剂量值一致，最大变化为8.9%。两组数据集之间的良好相关性证实了使用XR-QA2胶片进行晶状体剂量测定的可行性。
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