Jing Zhao, Presenter: Nothing to Disclose

Xinming Zhao, Abstract Co-Author: Nothing to Disclose

To evaluate whether Material Suppressed Iodine (MSI) images derived from CT spectral imaging can replace the conventional non-enhanced (CN) images in liver, and determine which phase is better between arterial phase (AP) and portal venous phase (PVP).

A total of 25 patients underwent examinations of conventional non-enhanced CT and two phases (arterial phase, AP and portal venous phase, PVP) contrast enhanced CT scans. For both AP and PVP, monochromatic images were reconstructed and the MSI images were generated by suppressing iodine on 70keV monochromatic image with a dedicated software (GSI Volume Viewer, Advantage Workstation 4.6).The average CT value, image noise and in the liver, adipose tissue, vertebrae, muscle and pancreas were measured respectively .The subjective image quality score was assessed with 5-point scale. Variables were compared with paired student T-test and rank-sum test.

The average CT values of liver, portal venous, vertebrae, muscle and pancreas were slight higher in MSI of dual-phase images than CN images. The difference was not statistically significant (p>0.05). However, adipose tissues in MSI images of dual-phase images were slight lower than CN images (each p>0.05). MSI of arterial phase images showed remarkable lower average CT values than MSI of portal venous phase images (each p<0.05). Image noise in the liver，portal venous，adipose tissue, vertebrae, muscle and pancreas were significantly higher in MSI of dual-phase images(each p<0.05) than CN images. Image noise of such organs was slightly lower in MSI of arterial phase images than portal venous phase images (each p<0.05). The subjective image quality scores were higher in MSI of arterial phase images than portal venous phase images (p<0.05).

Material Suppressed Iodine (MSI) images are acceptable as replacements for the conventional non-enhanced (CN) images. MSI of arterial phase images show more advantages than MSI of portal venous phase images in replacements of the conventional non-enhanced (CN) images.

Material Suppressed Iodine (MSI) images can replace the conventional non-enhanced (CN) images as an imaging protocol in liver dual-phase examination in clinic.

Zhao, J, Zhao, X, Arterial Phase and Portal Venous Phase, Which Is Better for Material Suppressed Iodine (MSI) Images to Replace Conventional Non-enhanced (CN) Images in Liver CT?.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14045774.html