Method and apparatus for improving the vessel/tissue...

Details Method and apparatus for improving the vessel/tissue... Method and apparatus for improving the vessel/tissue...

2007-04-17

2007-04-17

Casler, Brian L. (Department: 3737)

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

C600S407000, C600S419000

Reexamination Certificate

active

10407676

ABSTRACT:
In a method and apparatus for improving the vessel/tissue contrast in time-of-flight angiography with a magnetic resonance tomography measurement, a sequence of radiofrequency excitation pulses is generated that each have a flip angle and a temporal spacing in the sequence defined by a repetition time, gradient pulses are generated with gradient coils such that, using an analog-to-digital converter, the magnetic resonance response signals are sampled in the frequency domain (k-space) in a slice referred to as a k-matrix, the k-matrix is sampled such that the respective distances of the measuring points from the center of the k-matrix are continuously increased (or decreased), and the repetition time is varied during the sampling, and/or the flip angle is varied during the sampling.

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patent: 0 798 566 (2002-01-01), None

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