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This chapter summarizes the current state of carotid magnetic resonance angiography (MRA) and deals with the technical aspects of the various types of MRA, including time-of-flight (TOF), phase-contrast (PC) and contrast-enhanced MRA. TOF MRA can be performed as either multiple 2D single slice acquisitions or as a 3D volumetric flow compensated acquisition. Multiple overlapping thin slab acquisition (MOTSA) method aims to reduce the saturation effect by reducing the thickness of the 3D slabs, but maintains the volume coverage by using multiple slabs. Phase-contrast MRA relies on detecting changes in the phase of blood's transverse magnetization as it moves along a magnetic field gradient. Gadolinium-based contrast agents have been used with TOF MRA in order to improve the signal-to-noise ratio (SNR) of carotid angiograms. Amongst the various types of MRA available, 2D TOF and PC techniques are suitable for screening but they suffer from a number of technical limitations.
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