T1-insensitive flow suppression using quadruple inversion-recovery.
A new flow suppression method has been proposed for the acquisition of blood-suppressed (black-blood) images in combination with administration of a positive contrast agent. The technique employs the quadruple inversion-recovery (QIR) preparative pulse sequence, which consists of two double-inversion modules followed by two delays. Within each double inversion, a nonselective RF pulse is immediately followed by a slice-selective one. The time intervals of the sequence can be calculated using an algorithm based on minimization of the variation of a signal equation over an entire range of T(1) occurring in blood before and after contrast administration. QIR is highly insensitive to variations of T(1), providing efficient suppression of a flow signal with T(1) in a range of 200-1200 ms. The technique utilizes identical scan parameters for pre- and postcontrast acquisition, and thus allows reliable quantitative interpretation of contrast enhancement (CE). The clinical application of QIR was demonstrated in high-resolution, contrast-enhanced, black-blood imaging of atherosclerotic plzzaque.
Yarnykh
Vasily L
VL
Department of Radiology, University of Washington, Seattle, Washington 98195, USA. yarnykh@u.washington.edu
Yuan
Chun
C
D003287:Contrast Media; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D015636:Magnesium Chloride; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008962:Models, Theoretical; D019047:Phantoms, Imaging
D003287:Contrast Media; D015636:Magnesium Chloride