Abstract Archives of the RSNA, 2012
LL-PHS-WE2D
Effect of Adaptive Statistical Iterative Reconstruction Technique on CT Imaging Measurement of Emphysema
Scientific Informal (Poster) Presentations
Presented on November 28, 2012
Presented as part of LL-PHS-WEPM: Physics Afternoon CME Posters
Jian-Xing Qiu MD, Presenter: Nothing to Disclose
Xiaoying Wang MD, Abstract Co-Author: Nothing to Disclose
Xiaochao Guo, Abstract Co-Author: Nothing to Disclose
Rui Wang PhD, Abstract Co-Author: Nothing to Disclose
To assess the effect of adaptive statistical iterative reconstruction(ASiR) technique on quantitative measurement derived from computed tomography(CT) lung images of patients with emphysema.
Fifteen patients(10 men and 5 women; range 62-86ys) clinically diagnosed as COPD, underwent a thoracic CT imaging protocol using GE Discovery CT750HD. Institutional review board approval and written informed consent were obtained before CT scanning. CT image raw data sets were reconstructed with filtered back projection(FBP) and ASiR-FBP composites at 10%, 30%, 50%, 70%, 90%. All images were reconstructed with a standard algorithm. Density mask(RA-950) and volume measurements from different ASiR-FBP composites were compared with FBP reconstruction. K related samples test (Friedman Type) was used to analysis the variance of density mask and volume measurements from FBP and different ASiR-FBP composites reconstruction.
Comparison with FBP, reconstruction with ASiR compsites at 10%, 30%, 50%, 70%, 90% did not yielded effect on the total lung volume measurements(P=0.057), but underestimated emphysema %(RA-950)(P<0.001) and emphysema volume(P<0.001). ASiR 90% yield an average shift of -15.1% in emphysema % and -15.0% in emphysema volume.
CT image raw data reconstruction with ASiR may effect density mask results, but not effect total lung volume.
CT image raw data sets;were usually reconstructed with ASiR;to reduce noise in low radiation dose scanning,but ARiR technique may underestimate emphysema % and emphysema volume.
Qiu, J,
Wang, X,
Guo, X,
Wang, R,
Effect of Adaptive Statistical Iterative Reconstruction Technique on CT Imaging Measurement of Emphysema. Radiological Society of North America 2012 Scientific Assembly and Annual Meeting, November 25 - November 30, 2012 ,Chicago IL.
http://archive.rsna.org/2012/12043873.html