Multiple-readout selective inversion recovery angiography

✍ Scribed by Samuel J. Wang; Dwight G. Nishimura; Albert Macovski

• Publisher: John Wiley and Sons
• Year: 1991
• Tongue: English
• Weight: 444 KB
• Volume: 17
• Category: Article
• ISSN: 0740-3194
• DOI: 10.1002/mrm.1910170127

✦ Synopsis

We have developed a variation of selective inversion recovery (SIR) angiography that allows us to obtain a collection of several angiograms within the same acquisition time previously required to obtain a single image. In basic SIR, a single readout is performed after the tagging inversion pulse. In multiple-readout SIR, a succession of readout pulses is applied following the inversion pulse. By varying the gradients appropriately during the successive readouts, we can obtain a set of multiple projection-angle angiograms, or, by appropriately spacing the readouts throughout the cardiac cycle, we can obtain a set of time-resolved angiograms. This technique allows us to obtain additional spatial or temporal information without increasing total scan time. A sequence of increasing flip-angle read pulses is used to maintain a constant signal level across the images. A trade-off exists between SNR and the number of images acquired.