The influence of head motion on image quality of 64-slice volume CT digital subtraction angiography
- VernacularTitle:头部运动对容积CT数字减影血管造影图像质量的影响
- Author:
Fajin LV
- Publication Type:Journal Article
- Keywords:
Angiography;
Digitalsubtractionangiography;
Tomographic;
X-raycomputer
- From:
Journal of Chongqing Medical University
1986;0(03):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the influence of the type and extentofhead motion on subtraction image quality of 64-slice volume CT digital subtraction angiography(VCTDSA). Methods:Forty-four consecutive patients(18 male,26 female;mean age,(52.6?17.6) years)underwent VCTDSA for the evaluation of cerebral vascular disorders. We performed the scanning with two different registration methods:test bolus injection without head fixation and registration with rigid head fixation. Imaging data of two different scan modes were then analyzed. The type and extent of head motion between two scan modes as well as the manifestation,degree of artifacts after subtraction were evaluated. Results:There were three forms of head motion during test bolus scan:intra-lamina(r77.3%),inter-lamina(r4.5%)and mixed motion (18.2%). High density motion artifacts of subtraction images were observed near the border of the anatomic structures. Motion artifacts were obviously reduced by head fixation. With head fixation approach,the subtraction angiograms without motion artifact increased from 13.6% to 59.1%,and images with moderately to severe artifacts reduced from 47.1% to 11.4%. Conclusion:There were three forms of head motion without head fixation,and different form motion artifacts were observed after subtraction. Head fixation prevents motion artifacts and greatly improves subtraction image quality.
