Surgery – Diagnostic testing – Detecting nuclear – electromagnetic – or ultrasonic radiation
Patent
1997-09-02
1999-04-27
Smith, Ruth S.
Surgery
Diagnostic testing
Detecting nuclear, electromagnetic, or ultrasonic radiation
600419, 600509, 600528, A61B 5055
Patent
active
058974962
ABSTRACT:
According to the present invention, during performing an MRA sequence comprising a plurality (N) of pulse sequence units each of which gives blood flow a different phase rotation, one sequence unit is repeated a given number (L) of times in every cardiac cycle gated by ECG or pulse wave signals of the object under examination. A measurement of N cardiac cycles, as one round, is repeated to collect data completely filling a k-space for each sequence unit. In this repetition, the order of phase encoding magnetic fields is controlled so that data in the low frequency region of k-space are acquired at the cardiac phase corresponding to the diastolic phase of one cardiac cycle and data in the high frequency region are acquired at the cardiac phase corresponding to the systolic phase. The MRA of the present invention is not likely to be affected by the changes in blood flow caused by heart beats and does not prolong the time for measurement.
REFERENCES:
patent: 4777957 (1988-10-01), Wehrli et al.
patent: 5251628 (1993-10-01), Foo
patent: 5329925 (1994-07-01), Nessaiver
patent: 5477144 (1995-12-01), Rogers JR.
Hitachi Medical Corporation
Smith Ruth S.
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