2024年12月29日 · MR vessel wall imaging (VW-MRI) refers to MRI techniques used to evaluate for disease within the walls of arteries, beyond the luminal abnormalities depicted on angiographic imaging.

In theory, dark-blood MRA has some unique advantages compared to bright-blood techniques. Flow separation and turbulence, which cause unwanted signal losses and overestimation of stenoses on bright-blood MRA, paradoxically improve image quality on dark-blood MRA.

Dark ("black") blood MRA techniques suppress signal from flowing blood while maintaining high signal in the surrounding stationary tissues, thus rendering the vessels black. The dark blood effect may be achieved by accentuating flow-related dephasing or exploiting the T1 and T2 properties of blood.

Black blood MRI of intracranial vessel walls can help in a range of pathologies with differing pathophysiology, including intracranial atherosclerosis, aneurysms, vasculitis and vasculopathy, moyamoya disease, dissection and vertebrobasilar hypoplasia.

Double inversion recovery (DIR) is a type of "black blood" technique useful for visualizing the walls of the cardiac chambers and blood vessels (including the coronary arteries). As the name implies, the sequence involves application of two RF-inversion pulses in …

2019年5月9日 · Black-blood MRI findings were evaluated by 2 independent and blinded neuroradiologists. Large-vessel intracranial arterial segments were graded on a 3-point scale (grades 0–2) for intraluminal baseline T1 hyperintensity and contrast enhancement.

Black-blood MRA, also known as spatial presaturation MRI, is an alternative MRA technology. Black-blood MRA is able to convert the lumen into a low signal and display the vessel walls with increased image clarity.

In this review we cover the physics of black-blood contrast and different techniques to achieve blood suppression, from methods intrinsic to the imaging readout to magnetization preparation pulses that can be combined with arbitrary readouts, including flow-dependent and flow-independent techniques.

Background: Bright-blood MRI is the reference standard for imaging cardiac structures and coronary arteries, whereas black-blood excels in visualizing the myocardium, atrial and vessel walls. Additionally, quantitative myocardial tissue characterization provides valuable information on the presence of myocardial fibrosis, oedema, or inflammation.

Black Blood imaging can help us to noninvasively visualize vessel wall thickening and enhancement patterns that occur in vasculitis, and help us distinguish it from atherosclerotic lesions.