MR imaging apparatus using a devised MTC pulse waveform

Details MR imaging apparatus using a devised MTC pulse waveform MR imaging apparatus using a devised MTC pulse waveform

1995-05-23

1997-11-04

Lateef, Marvin M.

Surgery

Truss

Pad

324307, 324309, A61B 5055

Patent

active

056828918

ABSTRACT:
An MR imaging apparatus using NMR phenomenon includes a main magnet, a first, a second and a third gradient field coils, a RF coil, a gradient field controller connected to the first, second and third gradient field coils, a RF controller connected to the RF coil, a waveform generator, a carrier wave generator, an amplitude modulator, a RF controller connected to the RF coil, and a data processor. The waveform generator generates a modulating signal expressed by F(t)=A {cos (.omega.t)-cos (E.omega.t)}/t, where A is an amplitude coefficient, .epsilon. is a non-excitation band coefficient, and .omega. is a frequency of the modulating signal. The RF controller causes the RF coil, in each pulse sequence, to transmit a RF signal and to apply, to the RF signal, a modulated wave output from the amplitude modulator as an MTC pulse having a frequency component slightly offset from a resonance frequency of free water protons, and a resonance frequency component of free water protons. The data processor collects data from the NMR signal detected by the RF coil, and reconstructs a sectional image from the data.

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