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Original Research Minimizing Dead-Periods in Flow-Encoded

Summary: Original Research
Minimizing Dead-Periods in Flow-Encoded
or -Compensated Pulse Sequences While Imaging
in Oblique Planes
Bradley D. Bolster, Jr., MSE1 and Ergin Atalar, PhD2*
A technique is developed to minimize magnetic resonance
pulse sequence dead-periods, with first and higher moment
requirements, while imaging in oblique planes. Dead-
period requirements of starting amplitude, ending ampli-
tudes, area, and other moment requirements are trans-
formed from the image coordinate system to the physical
gradient coordinate system, where the waveforms are then
designed. With this technique, the full capabilities of the
gradient hardware are utilized. An online algorithm is
presented to perform dead-period minimization and gradi-
ent waveform design when the first moment and area of the
dead-period are specified. The algorithm is then used to
implement three-axis flow-compensation in a fast spoiled
gradient-echo sequence. This results in a minimal increase
in TE and TR over an equivalent non-flow-compensated


Source: Atalar, Ergin - Department of Electrical and Electronics Engineering, Bilkent University


Collections: Engineering; Biology and Medicine