Optimization of scanning parameters for 64-slice volume CT digital subtraction angiography

FANG Wen-hao; et al

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Optimization of scanning parameters for 64-slice volume CT digital subtraction angiography

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- Optimization of scanning parameters for 64-slice volume CT digital subtraction angiography
- Journal of Chongqing Medical University Vol. 34, Issue 11, Pages: 1542-1545(2009)
- 作者机构：
  
  1. 重庆医科大学附属第一医院放射科
  2. 重庆医科大学附属第一医院神经内科
- 作者简介：
- 基金信息：
- DOI：
  CLC： R816.1
- Published：2009，
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[1]房文皓,吕发金,张志伟,张丽娟,谢鹏.64层容积CT数字减影血管造影扫描参数优化的实验研究[J].重庆医科大学学报,2009,34(11):1542-1545.

FANG Wen-hao, et al. Optimization of scanning parameters for 64-slice volume CT digital subtraction angiography. [J]. Journal of Chongqing Medical University 34(11):1542-1545(2009)
[1]房文皓,吕发金,张志伟,张丽娟,谢鹏.64层容积CT数字减影血管造影扫描参数优化的实验研究[J].重庆医科大学学报,2009,34(11):1542-1545. DOI：

FANG Wen-hao, et al. Optimization of scanning parameters for 64-slice volume CT digital subtraction angiography. [J]. Journal of Chongqing Medical University 34(11):1542-1545(2009) DOI：

摘要

目的:探讨管电流（mA）、管电压（kV）、层厚及螺距变化对64层容积CT数字减影血管造影（Volume computed tomograp hic digital subtraction angiography

VCTDSA）图像质量和辐射剂量的影响。方法:对颅骨标本采用VCTDSA扫描方法进行扫描

不同mA（100、85、75、65、50、25、10mA）、kV（两次扫描同步变化140、120、100、80kV;不同步变化120～140、100～140、80～140、100～120、80～120、80～100 kV）、层厚（0.625、1.25、2.5、3.75、5 mm）和螺距（0.531、0.969）的变化组合进行扫描

用Add/Sub软件进行减影

测量减影后全图CT值反映图像噪声

减影后图像行3D容积重建（3D Volume rendering

3D VR）评价减影图像质量。结果:变化mA、同步与非同步变化kV、变化层厚和同步变化螺距减影后图像质量均为Ⅰ级（100%）

非同步变化螺距减影后图像质量为Ⅲ级（100%）。随mA、kV、层厚降低和螺距增大

减影后全图CT值增大

图像噪声增加而图像质量降低。非同步变化kV的双能量减影

随kV的增加

减影后全图CT值降低

图像噪声降低而图像质量提高。结论:应用双能量、厚层采集薄层重建、降低毫安和增加螺距

不仅能保证VCTDSA的图像质量

同时可降低X线辐射剂量。

Abstract

Objective:To investigate the influence of scanning parameters(including mA

slice thickness and pitch)on image quality and radiation dose of volume computed tomographic digital subtraction angiography(VCTDSA).Methods:VCTDSA were performed on a skull specimen.Scans were obtained with different scanning parameters

including current of 100

25 and 10 mA

synchronic voltage modification of 140

120

100 and 80 k V

non-synchronic voltage modification of 120~140

100~140

80~140

100~120

80~120 and 80~100 kV

slice thickness of 0.625

1.25

2.5

3.75 and 5 mm

and pitch of 0.531

0.969.CT numbers of the overall view were measured on subtraction images obtained from Add/Sub software.The image quality of subtraction images were analyzed

which were reformatted and displayed with 3D volume rendering(3D VR).Results:Except subtracted image qualitys were evaluated gradeⅢ(100%)with non-synchronic pitch

other subtracted image qualitys were evaluated grade Ⅰ(100%)undergoing different scanning parameters(mA

slice thickness and synchronic pitch).With the decrease of mA

slice thickness and the increase of pitch

CT numbers and imaging noise increased

and imaging quality after subtraction decreased.Image quality was improved and noise was reduced by dual energy subtraction.With the increase of k V

CT numbers increased.Conclusion:Image quality was improved and radiation dose was reduced by dual energy subtraction technique

thick collection and reconstruction in thin slice

decreasing mA and increasing pitch.

关键词

血管造影数字减影血管造影体层摄影术X线计算机辐射剂量

Keywords

Angiographydigital subtraction angiographytomographyX-ray computerradiation dose

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