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Improved MR imaging in extremely inhomogeneous radio-frequency fields

✍ Scribed by Navin Bansal; Ray L. Nunnally

Book ID
103909415
Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
786 KB
Volume
9
Category
Article
ISSN
0730-725X

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✦ Synopsis

An improvement to the method for imaging with extremely inhomogeneous radio-frequency fields is presented which uses a pseudo-noise-modulated selective (PNMS) excitation prepulse to randomize the signal from outside the selected slice. This prepulse reduces the problems that arise from imperfect subtraction involved with the one-dimensional ISIS-type slice selection procedures. The results demonstrate two to three times improvement in the signal-to-noise ratio and reduction in the image artifacts when this prepulse is used.

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## Abstract At 1.5 T, the field strength of most clinical MR imagers, gradient‐echo Imaging Is the primary imaging method for measuring brain activation, as such sequences are highly sensitive to changes in blood oxygenation or T2\* effects. Unfortunately, gradient‐echo sequences are also extremely