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Updated: Mar 16, 2026
X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
Published on: September 11, 2011
Effect of the forward-projected model-based iterative reconstruction solution algorithm on image quality and
Yukako Nishiyama1, Keiji Tada2, Yuichi Nishiyama3
1Department of Radiology, Shimane University Hospital, 89-1 Enya-cho, Izumo-shi, Shimane, 693-8501, Japan. nyukako@med.shimane-u.ac.jp.
Background:
Some iterative reconstruction algorithms are useful for reducing the radiation dose in pediatric cardiac CT. A new iterative reconstruction algorithm (forward-projected model-based iterative reconstruction solution) has been developed, but its usefulness for radiation dose reduction in pediatric cardiac CT is unknown.
Objective:
To investigate the effect of the new algorithm on CT image quality and on radiation dose in pediatric cardiac CT.
Materials And Methods:
We obtained phantom data at six dose levels, as well as pediatric cardiac CT data, and reconstructed CT images using filtered back projection, adaptive iterative dose reduction 3-D (AIDR 3-D) and the new algorithm. We evaluated phantom image quality using physical assessment. Four radiologists performed visual evaluation of cardiac CT image quality.
Results:
In the phantom study, the new algorithm effectively suppressed noise in the low-dose range and moderately generated modulation transfer function, yielding a higher signal-to-noise ratio compared with filtered back projection or AIDR 3-D. When clinical cardiac CT was performed, images obtained by the new method had less perceived image noise and better tissue contrast at similar resolution compared with AIDR 3-D images.
Conclusion:
The new algorithm reduced image noise at moderate resolution in low-dose CT scans and improved the perceived quality of cardiac CT images to some extent. This new algorithm might be superior to AIDR 3-D for radiation dose reduction in pediatric cardiac CT.
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