Effect of the forward-projected model-based iterative reconstruction solution algorithm on image quality and radiation dose in pediatric cardiac computed tomography.

Autor:	Nishiyama, Yukako, Tada, Keiji, Nishiyama, Yuichi, Mori, Hiroshi, Maruyama, Mitsunari, Katsube, Takashi, Yamamoto, Nobuko, Kanayama, Hidekazu, Yamamoto, Yasushi, Kitagaki, Hajime
Předmět:	ITERATIVE methods (Mathematics) IMAGE reconstruction IMAGE reconstruction algorithms IMAGE quality analysis RADIATION doses PEDIATRIC tomography CONGENITAL heart disease diagnosis ALGORITHMS COMPUTED tomography CONGENITAL heart disease HEART DIGITAL image processing IMAGING phantoms RESEARCH evaluation THREE-dimensional imaging
Zdroj:	Pediatric Radiology; Nov2016, Vol. 46 Issue 12, p1663-1670, 8p, 1 Diagram, 1 Chart, 5 Graphs
Abstrakt:	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. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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