Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1993-04-14
1994-07-12
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
G01R 3320
Patent
active
053292316
ABSTRACT:
In a presaturation period, a radio-frequency (RF) pulse for selectively tilting only spins outside an imaging region is applied while a slice selective gradient field Gs is applied, and a spoiler gradient field Gsp for saturating transverse magnetization outside the imaging region is subsequently applied to selectively presaturate the spins outside the imaging region. In a high-speed imaging period after the presaturation period, a sequence TR constituted by an operation of applying a very short rectangular non-selective excitation pulse RF for tilting spins in a slice by a predetermined angle, an operation of applying phase encoding and readout gradient fields Gp and Gr (without applying the slice selective gradient field Gs), and an operation of acquiring an MR signal is performed many times while the amplitude of the phase encoding gradient field Gp is changed, thereby acquiring a one-slice MR signal. In some cases, an operation of applying the spoiler gradient field Gsp is added after the operation of acquiring an MR signal.
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Hatta Jun-ichi
Machida Yoshio
Kabushiki Kaisha Toshiba
Tokar Michael J.
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