Improved MR imaging in extremely inhomogeneous radio-frequency fields.
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.
Bansal
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Department of Radiology, University of Texas Southwestern Medical Center, Dallas 75235.
Nunnally
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RL
D003198:Computer Simulation; D005583:Fourier Analysis; D006801:Humans; D007089:Image Enhancement / Q000295:instrumentation / Q000379:methods*; D007866:Leg / Q000033:anatomy & histology; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods*; D008280:Magnetics; D008961:Models, Structural; D011846:Radio Waves