Surgery – Diagnostic testing – Detecting nuclear – electromagnetic – or ultrasonic radiation
Reexamination Certificate
2006-03-21
2009-12-01
Le, Long V (Department: 3768)
Surgery
Diagnostic testing
Detecting nuclear, electromagnetic, or ultrasonic radiation
C324S307000, C324S309000
Reexamination Certificate
active
07627359
ABSTRACT:
A reduced field-of-view (FOV) imaging technique combines suppression of signals from outer volume and inflowing blood. Both outer volume and blood suppression are achieved using an SFQIR (Small-FOV Quadruple-inversion-Recovery) preparative pulse sequence including two double-inversion pulse pairs separated by appropriate delays. Within each pair, inversion pulses are successively applied to the imaged slice and the slab orthogonal to the imaging plane, with the thickness equal to the FOV size in the phase-encoding direction. Each double-inversion results in a reinversion of the magnetization in a central part of the FOV, while outer areas of the FOV and inflowing blood remain inverted. The SFQIR module was implemented for single-slice and multislice acquisition with a fast spin-echo readout sequence. Timing parameters of the sequence corresponding to the maximal suppression efficiency can be found by minimizing variation of the normalized signal over the entire range of T1occurring in tissues.
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Yarnykh Vasily L.
Yuan Chun
Anderson Ronald M.
Fontenot Nigel
Le Long V
University of Washington
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