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.
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.
Authors: Mannudeep K Kalra; Mischa Woisetschläger; Nils Dahlström; Sarabjeet Singh; Maria Lindblom; Garry Choy; Petter Quick; Bernhard Schmidt; Martin Sedlmair; Michael A Blake; Anders Persson Journal: J Comput Assist Tomogr Date: 2012 May-Jun Impact factor: 1.826
Authors: Matthias Renker; Ashok Ramachandra; U Joseph Schoepf; Rainer Raupach; Paul Apfaltrer; Garrett W Rowe; Sebastian Vogt; Thomas G Flohr; J Matthias Kerl; Ralf W Bauer; Christian Fink; Thomas Henzler Journal: J Cardiovasc Comput Tomogr Date: 2011-05-25
Authors: Frédéric A Miéville; François Gudinchet; Francis Brunelle; François O Bochud; Francis R Verdun Journal: Phys Med Date: 2012-01-02 Impact factor: 2.685