Effect of Reordering on Dynamic Contrast Enhancement

Vibhas Deshpande¹, Gabriel Acevedo-Bolton², Helmuth Schultze-Haakh³, David Saloner², Gerhard Laub³

Various reordering schemes with different benefits can be used for dynamic contrast-enhanced imaging. The effect of the reordering schemes on the contrast dynamics is however unclear. The purpose of this study was to evaluate contrast dynamics with linear, centric and radial centric-out k-space trajectory. Data were acquired in a flow phantom with a gradient-echo sequence and short and long injections. For short injections, radial centric-out trajectory shows artifacts because of varying T1s during the scan. Artifacts are reduced with a longer injection. Contrast-enhancement is less with radial centric-out as compared to linear or centric if T1s vary during the scan.