Comput Math Methods Med - Model for b1 imaging in MRI using the rotating RF field.

Tópicos

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Resumo

Conventionally, magnetic resonance imaging (MRI) is performed by pulsing gradient coils, which invariably leads to strong acoustic noise, patient safety concerns due to induced currents, and costly power/space requirements. This modeling study investigates a new silent, gradient coil-free MR imaging method, in which a radiofrequency (RF) coil and its nonuniform field (B 1 (+)) are mechanically rotated about the patient. The advantage of the rotating B 1 (+) field is that, for the first time, it provides a large number of degrees of freedom to aid a successful B 1 (+) image encoding process. The mathematical modeling was performed using flip angle modulation as part of a finite-difference-based Bloch equation solver. Preliminary results suggest that representative MR images with intensity deviations of <5% from the original image can be obtained using rotating RF field approach. This method may open up new avenues towards anatomical and functional imaging in medicine.

Resumo Limpo

convent magnet reson imag mri perform puls gradient coil invari lead strong acoust nois patient safeti concern due induc current cost powerspac requir model studi investig new silent gradient coilfre mr imag method radiofrequ rf coil nonuniform field b mechan rotat patient advantag rotat b field first time provid larg number degre freedom aid success b imag encod process mathemat model perform use flip angl modul part finitedifferencebas bloch equat solver preliminari result suggest repres mr imag intens deviat origin imag can obtain use rotat rf field approach method may open new avenu toward anatom function imag medicin

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