First experience with monochromatic coronary computed tomography angiography from a 64-slice CT scanner with Gemstone Spectral Imaging (GSI) Tobias A.

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Presentation transcript:

First experience with monochromatic coronary computed tomography angiography from a 64-slice CT scanner with Gemstone Spectral Imaging (GSI) Tobias A. Fuchs, MD, Julia Stehli, MD, Michael Fiechter, MD, PhD, Svetlana Dougoud, MD, Cathérine Gebhard, MD, Jelena R. Ghadri, MD, Lars Husmann, MD, Oliver Gaemperli, MD, Philipp A. Kaufmann, MD Journal of Cardiovascular Computed Tomography Volume 7, Issue 1, Pages 25-31 (January 2013) DOI: 10.1016/j.jcct.2013.01.004 Copyright © 2013 Society of Cardiovascular Computed Tomography Terms and Conditions

Figure 1 Transaxial coronary computed tomography angiography showing attenuation measurement in the aortic root (AO) left main artery (LM), and perivascular tissue (PT) (window width, 1200; window level, 240) of monochromatic reconstructions and different contributions of adaptive statistical iterative reconstruction (ASiR); 60 keV/0% ASiR (A), 75 keV/40% ASiR (B), and 110 keV/80% ASiR (C). Journal of Cardiovascular Computed Tomography 2013 7, 25-31DOI: (10.1016/j.jcct.2013.01.004) Copyright © 2013 Society of Cardiovascular Computed Tomography Terms and Conditions

Figure 2 Multiplanar reformation images of left anterior descending artery reconstructed with 60 keV/0% adaptive statistical iterative reconstruction (ASiR; A), 75 keV/40% ASiR (B), and 110 keV/80% ASiR (C). Journal of Cardiovascular Computed Tomography 2013 7, 25-31DOI: (10.1016/j.jcct.2013.01.004) Copyright © 2013 Society of Cardiovascular Computed Tomography Terms and Conditions

Figure 3 (A) With increasing monochromatic image energy the left main artery attenuation decreases while the perivascular tissue attenuation increases. This convergence of both curves results in a decrease in contrast. The curves represent the reconstructions with 0% adaptive statistical iterative reconstruction (ASiR). However, adding any ASiR contribution did not affect the curves. (B) Increasing values of monochromatic image energy resulted in a decrease in noise, which was further significantly reduced by adding 40% ASiR or more. (C) Compared with conventional polychromatic images contrast-to-noise ratio (CNR) significantly increased with the use of 40% or more ASiR in monochromatic reconstructions. Journal of Cardiovascular Computed Tomography 2013 7, 25-31DOI: (10.1016/j.jcct.2013.01.004) Copyright © 2013 Society of Cardiovascular Computed Tomography Terms and Conditions

Figure 4 Mean image quality of monochromatic reconstructions assed by Likert scale. The horizontal line presents mean image quality of standard images, that is, polychromatic images reconstructed with 0% adaptive statistical iterative reconstruction (ASiR). Journal of Cardiovascular Computed Tomography 2013 7, 25-31DOI: (10.1016/j.jcct.2013.01.004) Copyright © 2013 Society of Cardiovascular Computed Tomography Terms and Conditions