| XIAO Sheng-xiang,MAO Ding-li,CHAI Chun-hua,RUAN Ling-xiang,XIAO Wen-bo,ZHOU Xian-yong.Feasibility study of low-dose scan in 64-slice spiral CT abdominal angiography[J].Chinese Journal of Radiological Medicine and Protection,2010,30(4):480-482 |
| Feasibility study of low-dose scan in 64-slice spiral CT abdominal angiography |
| Received:May 09, 2010 |
| DOI：10.3760/cma.j.issn.0254-5098.2010.04.031 |
| KeyWords:Abdominal angiography Low-dose X-ray computed tomography High contrast resolution Low contrast resolution |
| FundProject: |
| Author Name | Affiliation | | XIAO Sheng-xiang | Departments of Radiology, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China | | MAO Ding-li | 浙江省计量科学研究院 | | CHAI Chun-hua | Departments of Radiology, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China | | RUAN Ling-xiang | Departments of Radiology, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China | | XIAO Wen-bo | Departments of Radiology, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China | | ZHOU Xian-yong | Departments of Radiology, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China |
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| Abstract:: |
| Objective To explore the feasibility and reasonable of low-dose scan on abdominal angiography in 64-slice spiral helical CT. Methods Phantom test: at 120 KV and from 200 mAs to 30 mAs at an interval of 10 mAs in each image acquisition, it was measured standard deviation (SD) of CT number, high contrast resolution and low contrast resolution, and then analyzed the relationship between the three parameters and the mAs values. Three mAs values were chosen to undertake clinical analysis. Clinical analysis: 90 randomly selected objects with abdominal angiography were divided into three groups, scanning with above three mAs values. Measurement of the SD value at the plain scan images was performed and the enhanced low-dose scan images were used post-processing with three-dimensional volume reconstruction (VR). The VR images were classified into three grades (excellent, moderate, bad) with the blind evaluation of three CT radiologists. The quality-correlation analysis was used between the standard deviation (SD) values of plain scan image and abdominal angiography VR image. Results According to the quality-correlation analysis between the standard deviation (SD) value of plain scan image and abdominal angiography VR image, the area under curve in receiver-operated characteristic (ROC) analysis was 0.921, 0.906 and 0.893 in each three group, respectively. Conclusions The low-dose scan of abdominal angiography is feasible. 80mAs can ensure better image quality. The enhanced scan probably can use 60mAs when the SD value is less than 5.78 in the plain scan; but when the SD value of plain scan is greater than 11.8, the enhanced scan is used best 100 mAs or higher. |
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