A Study on Image Distortion by Contrast Agent Concentration according to 1.5T and 3.0T in Diffusion Weighted Image

Abstract

The correlation between the readout segment and the GeneRalized Auto Calibrating Partial Parallel Acquisition (GRAPPA) acceleration factor in the Read out segmentation of long variable echo-trains Diffusion Weighted Image (RESOLVE DWI) after enhancement was analyzed to investigate the effects of the signal intensity and the image distortion on the difference of the main field and contrast agent concentration. Twenty - four phantoms were prepared for each concentration of contrast agent, and signal intensity and image distortion were evaluated. At 1.5T and 3.0T, images were acquired using Readout segment, GRAPPA acceleration factor and echo spacing parameters, and Roundness (%) was measured using Regions Of Interest Contours. As the readout segment increased, signal strength and image distortion decreased. As the GRAPPA acceleration factor increased, signal strength increased and image distortion decreased. In RESOLVE DWI, it is helpful to minimize the distortions and artifacts caused by the signal intensity detection in the contrast agent phantom experiment and confirm the correlation between the readout segment and the GRAPPA acceleration factor depending on the main field, thereby making it possible to produce images with high diagnostic value.