MR-angiography with non-cartesian signal acquisition

Abstract

In a method and apparatus for the creation of an MR image of a vascular structure of an examination region, the spins in the examination region are saturated by the irradiation of at least one RF saturation signal, which delivers a lower signal intensity as spins in a subsequent MR signal recording for the creation of the MR angiographic image, which flow through at least one blood vessel into the examination region, and are not saturated by the RF saturation pulse. Raw data space of the MR angiographic image is read out with a non-Cartesian trajectory in the MR signal acquisition for the creation of the MR angiographic image.

Description

technical field [0001] The invention relates to a method for generating an MR image of a vessel structure of an examination region and an MR system for the method. The term “angiographic image” is used generally below: it does not necessarily describe only a single two-dimensional image, but, depending on the context, optionally also an angiographic image dataset of a desired volume. Background technique [0002] In the field of MR angiography, methods that work without contrast agents are gaining increasing importance. Methods in this class attempt to take advantage of the pulsatile nature of arterial blood flow. Ideally, extinction of the arterial signal is obtained by signal acquisition with flow-sensitive sequences at moments of rapid flow velocity (systole). By recording the signal at the moment of the cardiac cycle (diastole) at which the velocity is at a minimum or zero, ideally an artery with a bright signal is obtained. By subtracting the two recorded data, the s...

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Problems solved by technology

But the problem here is that no efficiency can be gained here because the time used to encode the 3D partition is the same as the time used to get the 2D layer

So in order to improve a resolution of eg 3mm in the z direction to 0.75mm a measurement time 4 times longer has to be used

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