The Growing Problem of Humanizing Robots

Abstract

T(1)-shortening contrast agents have been widely used in time-resolvedmagnetic resonance angiography. To match imaging data acquisitionwith the short time period of the first pass of contrast agent, temporalresolution and/or spatial resolution have to be compromised in manycases. In this study, a novel non-contrast-enhanced technique wasdeveloped for time-resolved magnetic resonance angiography. Alternatingmagnetization preparation was applied in two consecutive acquisitionsof each measurement to eliminate the need for contrast media. Withoutthe constraint of contrast media kinetics, temporal resolution isdrastically improved from the order of a second as in conventionalcontrast-enhanced approach to tens of milliseconds (50.9 msec) inthis study, without compromising spatial resolution. Initial resultsfrom volunteer studies demonstrate the feasibility of this methodto depict anatomic structure and dynamic filling of main vesselsin the head.