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Balance indicates equal quantities of positive and negative lobes. The recorded signal simultaneously cumulates the free induction signal (FID) and that of the spin/stimulated echo. The contrast varies according to T2/T1 ratio.
1 wrz 2009 · T2 * relaxation is one of the main determinants of image contrast with GRE sequences and forms the basis for many magnetic resonance (MR) applications, such as susceptibility-weighted (SW) imaging, perfusion MR imaging, and functional MR imaging.
4 wrz 2022 · An MRI sequence is a number of radiofrequency pulses and gradients that result in a set of images with a particular appearance. This article presents a simplified approach to recognizing common MRI sequences, but does not concern itself with the particulars of each sequence.
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Balanced sequences are particularly useful in cardiac MRI. Because this form of sequence is extremely dependent on field homogeneity, it is essential to run a shimming prior the acquisition. Usually the gray and white matter contrast is poor, making this type of sequence unsuited for brain MRI.
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14 wrz 2024 · MRI artifacts are numerous and give an insight into the physics behind each sequence. Some artifacts affect the quality of the MRI exam, while others do not affect the diagnostic quality but may be confused with pathology.
