MR imaging scan using ECG-prep scan

摘要

An ECU-prep scan is used to set an optimum time phase in both systole and diastole of the heart. At each of the different time phases, an imaging scan is started to acquire a plurality of sets of echo data. An artery/vein visually separated blood flow image is produced from the echo data. The imaging scan uses a half-Fourier technique, for example. This provides high-quality blood flow images with shorter scan time, without injecting a contrast medium. Additionally, with a readout gradient pulse applied substantially parallel with a direction of slowly flowing blood, a scan is performed in synchronism with an optimally determined cardiac time phase. The readout gradient pulse has a dephasing pulse for enhancing differences in a flow void effect depending on blood flow velocities. This enables slow-speed flows, such as blood flows in the inferior limb, to be depicted without fail.

主权项

id="REI-00003" date="20160202" 1. An MRI system for obtaining an image relating to fluid within a region to be imaged of an object, comprising:
a time phase setting unit configured to set two different cardiac time phases falling into a systole and a diastole of a cardiac cycle of the object; a scanning unit configured to perform, toward the region to be imaged of the object, an MR imaging scan starting in turn at each of the two cardiac time pahses set by the time phase setting unit to acquire two sets of echo data, the MR imaging scan comprising a first scan starting at one of the two cardiac time phases falling in the systole and a second scan starting at the other of the two cardiac time phases falling in the diastole, both the first scan and the second scan being based on a half-Fourier technique; and an image producing unit configured to produce, from the two sets of echo data acquired by the scanning unit, the image relating to the fluid.