Radiation dose in cardiac CT angiography: protocols and image quality

被引：6
|
作者：
Oliveira, L. C. G. [1 ]
Gottlieb, I. [2 ]
Rizzi, P. [2 ]
Lopes, R. T. [1 ]
Kodlulovich, S. [3 ]
机构：
[1] Univ Fed Rio de Janeiro, COPPE, LIN, Ctr Tecnol,Ilha Fundao, BR-21949900 Rio de Janeiro, RJ, Brazil
[2] Clin Diagnost Imagem CDPI, BR-22649900 Rio De Janeiro, RJ, Brazil
[3] CNEN, IRD, BR-22780160 Rio De Janeiro, RJ, Brazil
来源：
RADIATION PROTECTION DOSIMETRY | 2013年 / 155卷 / 01期
关键词：
NONINVASIVE CORONARY-ANGIOGRAPHY; AXIAL SCANNING TOMOGRAPHY; BODY-MASS INDEX; COMPUTED-TOMOGRAPHY; EXPOSURE; OPTIMIZATION; MODULATION; REDUCTION; RADIOLOGY; IMPACT;
D O I：
10.1093/rpd/ncs313
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
This paper aims to evaluate the radiation dose exposure of patients submitted to cardiac computed tomography angiography. The effective dose was obtained from the product of doselength product values and the conversion factor established in the European Working Group for Guidelines on Quality Criteria in CT. The image noise and contrast- and signal-to-noise ratios were obtained for all images. Sixty-four- and 256-slice CT angiographies were used in 211 (68.5 ) and 97 (31.5 ) patients, respectively. The calculated mean effective dose with prospective CT angiography was 6.01.0 mSv and the retrospective mode was 8.41.2 mSv. The mean image noise values were 38.59.5 and 21.4 5.3 for prospective and retrospective modes, respectively. It was observed that the image noise increased by 44.4 using a prospective mode. Prospective CT angiography reduces radiation dose by 29 compared with the retrospective mode, while maintaining diagnostic image quality and the ability to assess obstructions in patients.
引用
收藏
页码：73 / 80
页数：8
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