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Updated: Sep 15, 2025
X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
Published on: September 11, 2011
Effects of various tilt angles on radiation dose and image quality in pediatric head computed tomography: A phantom
Hongrong Xu1, Jiawen Zhao1, Zhen Xu1
1Department of Radiology, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Structural Birth Defect and Reconstruction, Children's Hospital of Chongqing Medical University, Chongqing, China.
Background:
Various methods have been employed to reduce radiation dose and improve image quality in head computed tomography (CT); however, the impact of different head tilt angles on these factors remains underexplored.
Objective:
To investigate the effects of different head tilt angles on radiation dose and image quality in head CT.
Materials And Methods:
A pediatric anthropomorphic head phantom was scanned using dual-source CT at 18 different tilt angles, repeated 10 times at each angle. Image quality was assessed using mean CT (CTmean) attenuation values and image noise at six regions of interest (ROIs), while radiation dose was evaluated using volume CT dose index (CTDIvol), size-specific dose estimate (SSDE), and dose-length product (DLP). The scan lengths of the eyes and head were also recorded.
Results:
CTDIvol and SSDE did not exhibit clear variation patterns with changes in head tilt angles, while DLP was in the lower region between -10° and 5°. Head scan lengths were relatively shorter between -10° and 5°, and eye scan lengths were relatively shorter between -10° and 0°. Except for the image noise of the right middle cranial fossa, no significant differences were found in CTmean values and image noise for the other ROIs between -10° and 0°.
Conclusion:
The findings indicated that adjusting the head tilt angle within the range of -10° to 0° reduced both the head and eye scan lengths as well as the radiation dose, while preserving relatively stable image quality.
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