Surgery – Diagnostic testing – Detecting nuclear – electromagnetic – or ultrasonic radiation
Patent
1996-09-12
1998-08-11
Casler, Brian
Surgery
Diagnostic testing
Detecting nuclear, electromagnetic, or ultrasonic radiation
324306, 600419, A61B 5055
Patent
active
057920540
ABSTRACT:
An off-resonance magnetization transfer contrast (MTC) RF-pulse (54, 64) is used in magnetic resonance angiography (MRA) to suppress the signal of various stationary tissues, such as brain tissue while avoiding significant suppression of signal from blood flowing in a general direction of blood flow into a slice being imaged. Application of a magnetic gradient (55, 65, 85) during the MTC RF-pulse (54, 64) directed in the general direction of blood flow increases the magnetization frequency offset (86) relative to the center frequency of the MTC RF-pulse for points within and feeding blood to the slice. The MTC RF-pulse thus causes only a small signal reduction of the blood flowing into the slice in the general direction of blood flow while producing a saturation of any blood flowing into the slice in the opposite direction. Consequently, both time and RF-power needed for a separate presaturation pulse can now be used for the MTC RF-pulse.
REFERENCES:
patent: 5050609 (1991-09-01), Balaban et al.
patent: 5250898 (1993-10-01), Hu et al.
patent: 5270652 (1993-12-01), Dixon et al.
patent: 5320099 (1994-06-01), Roberts et al.
patent: 5339035 (1994-08-01), Schneider et al.
patent: 5627468 (1997-05-01), Kojima et al.
"Magnetization Transfer Time-of-Flight Magnetic Resonance Angiography", by G.B. Pike, et al, Magnetic Resonance in Medicine 25, 1992, pp. 372-379.
De Boer Rudolf W.
Hofland Lennart
Kouwenhoven Marc
Van Vaals Johannes J.
Casler Brian
Slobod Jack D.
U.S. Philips Corporation
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