Dipolar weighted MR imaging in-vivo
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United States of America Patent
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Sep 6, 1994
Grant Date -
N/A
app pub date -
Mar 16, 1993
filing date -
Mar 16, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An RF pulse sequence (40, 42, 44) is applied to generate magnetic resonance in which a dipolar or bound spin system component of the magnetic resonance has a quadrature or 90.degree. phase offset from a Zeeman or free spin system component of the magnetic resonance. The resultant resonance signal is encoded with magnetic field gradients (50, 52, 54) and sampled during a dipolar spin system resonance echo (46). The process is repeated altering the relative phase of the three RF pulses (40', 42', 44') and of a digital radio frequency receiver (28) such that the sampled dipolar and Zeeman spin system components are again in quadrature, but 90.degree. offset in the opposite sense. The two resonance signals with their Zeeman components out of phase in the opposite sense are combined (64) such that the dipolar spin system components add and the Zeeman spin system components cancel. The combined or dipolar weighted resonance signals are collected in a data memory (66) with a plurality of different phase encodings and reconstructed (70) into an image representation (72) for selective display on a video monitor (76).
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