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Phase contrast MRI is one of the main techniques for magnetic resonance angiography (MRA). This is used to generate images of arteries (and less commonly veins) in order to evaluate them for stenosis (abnormal narrowing), occlusions, aneurysms (vessel wall dilatations, at risk of rupture) or other abnormalities. MRA is often used to evaluate ...
Magnetic resonance angiography (MRA) and venography: Time-of-flight: TOF: Blood entering the imaged area is not yet magnetically saturated, giving it a much higher signal when using short echo time and flow compensation. Detection of aneurysm, stenosis, or dissection [31] Phase-contrast magnetic resonance imaging: PC-MRA
This is the basis of the idea of phase contrast imaging. [2] As an example, consider the setup shown in the figure on the right. A schematic illustrating the ray optics of phase contrast imaging. A probe laser is incident on a phase object. This could be an atomic medium such as a Bose-Einstein Condensate. [3]
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Magnetic resonance angiography (MRA) and venography: Time-of-flight: TOF: Blood entering the imaged area is not yet magnetically saturated, giving it a much higher signal when using short echo time and flow compensation. Detection of aneurysm, stenosis, or dissection [94] Phase-contrast magnetic resonance imaging: PC-MRA
Phase-contrast (PC-MRA) can be used to encode the velocity of moving blood in the magnetic resonance signal's phase. [3] The most common method used to encode velocity is the application of a bipolar gradient between the excitation pulse and the readout. A bipolar gradient is formed by two symmetric lobes of equal area.
The key to Phase-contrast MRI (PC-MRI) is the use of a bipolar gradient. [4] A bipolar gradient has equal positive and negative magnitudes that are applied for the same time duration. The bipolar gradient in PC-MRI is put in a sequence after RF excitation but before data collection during the echo time of the generic MRI modality.
Magnetic resonance angiography (MRA) and venography: Time-of-flight: TOF: Blood entering the imaged area is not yet magnetically saturated, giving it a much higher signal when using short echo time and flow compensation. Detection of aneurysm, stenosis, or dissection [40] Phase-contrast magnetic resonance imaging: PC-MRA