Cardiac CT: are we underestimating the dose? A radiation dose study utilizing the 2007 ICRP tissue weighting factors and a cardiac specific scan volume

被引：71

作者：

Gosling, O. ^{[1
]}

Loader, R. ^{[1
]}

Venables, P. ^{[1
]}

Rowles, N. ^{[1
]}

Morgan-Hughes, G. ^{[1
]}

Roobottom, C. ^{[2
]}

机构：

[1] Derriford Hosp, Plymouth Hosp NHS Trust, Plymouth PL6 8DH, Devon, England

[2] Univ Plymouth, Peninsula Coll Med & Dent, Plymouth PL4 8AA, Devon, England

来源：

CLINICAL RADIOLOGY | 2010年 / 65卷 / 12期

关键词：

TOMOGRAPHY CORONARY-ANGIOGRAPHY; COMPUTED-TOMOGRAPHY; REDUCTION; RADIOLOGY;

D O I：

10.1016/j.crad.2010.08.001

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

AIM: To calculate the effective dose from cardiac multidetector computed tomography (MDCT) using a computer-based model utilizing the latest International Commission on Radiation Protection (ICRP) 103 tissue-weighting factors (2007), to compare this dose with those calculated with previously published chest conversion factors and to produce a conversion factor specific for cardiac MDCT. MATERIALS AND METHODS: An observational study of 152 patients attending for cardiac MDCT as part of their usual clinical care in a university teaching hospital. The dose for each examination was calculated using the computer-based anthropomorphic ImPACT model (the imaging performance assessment of CT scanners) and this was compared with the dose derived from the dose length product (DLP) and a chest conversion factor. RESULTS: The median effective dose calculated using the ImPACT calculator (4.5 mSv) was significantly higher than the doses calculated with the chest conversion factors (2.2-3 mSv). CONCLUSION: The use of chest conversion factors significantly underestimates the effective dose when compared to the dose calculated using the ImPACT calculator. A conversion factor of 0.028 would give a better estimation of the effective dose from prospectively gated cardiac MDCT. (C) 2010 The Royal College of Radiologists. Published by Elsevier Ltd. All rights reserved.

引用

页码：1013 / 1017

页数：5

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