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An MRI pulse sequence in magnetic resonance imaging (MRI) is a particular setting of pulse sequences and pulsed field gradients, resulting in a particular image appearance. [ 1 ] A multiparametric MRI is a combination of two or more sequences, and/or including other specialized MRI configurations such as spectroscopy .
Standard foundation and comparison for other sequences Proton density weighted: PD: Long TR (to reduce T1) and short TE (to minimize T2). [4] Joint disease and injury. [5] High signal from meniscus tears. [6] (pictured) Gradient echo (GRE) Steady-state free precession: SSFP: Maintenance of a steady, residual transverse magnetisation over ...
Modern 3 Tesla clinical MRI scanner.. Magnetic resonance imaging (MRI) is a medical imaging technique mostly used in radiology and nuclear medicine in order to investigate the anatomy and physiology of the body, and to detect pathologies including tumors, inflammation, neurological conditions such as stroke, disorders of muscles and joints, and abnormalities in the heart and blood vessels ...
Magnetic resonance angiography (MRA) is a group of techniques based on magnetic resonance imaging (MRI) to image blood vessels. Magnetic resonance angiography 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.
A conventional gradient echo T2*-weighted image (left, TE=20 ms) shows some low-signal foci associated with CAA. On the other hand, an SWI image (center, with a resolution of 0.5 mm x 0.5 mm x 2.0 mm, projected over 8mm) shows many more associated low-signal foci. Phase images were used to enhance the effect of the local hemosiderin build-up.
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In magnetic resonance imaging (MRI), the k-space or reciprocal space (a mathematical space of spatial frequencies) is obtained as the 2D or 3D Fourier transform of the image measured. It was introduced in 1979 by Likes [ 1 ] and in 1983 by Ljunggren [ 2 ] and Twieg.
A study performed by Laubrock et al. [28] demonstrated that RT-MRI produced higher quality images with a higher SNR than cine CMR with a bSSFP sequence and radial k-space sampling. RT-MRI also removes the need for breath-holding while imaging, leading to a more comfortable experience for the patient as well.