Noncontrast-enhanced renal angiography using multiple inversion recovery and alternating TR balanced steady-state free precession
| Autor: | Dwight G. Nishimura, Shreyas S. Vasanawala, R. Reeve Ingle, Hattie Zhi Chen Dong, Pauline W. Worters, Holden H. Wu |
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| Rok vydání: | 2012 |
| Předmět: |
Adult
Male Heartbeat media_common.quotation_subject Contrast Media Inversion recovery Sensitivity and Specificity Signal Article Renal Circulation Young Adult Renal Artery Nuclear magnetic resonance Renal angiography Image Interpretation Computer-Assisted medicine Humans Contrast (vision) Radiology Nuclear Medicine and imaging Steady state free precession media_common Physics medicine.diagnostic_test Reproducibility of Results Steady-state free precession imaging Image Enhancement Angiography Female Algorithms Blood Flow Velocity Magnetic Resonance Angiography |
| Zdroj: | Magnetic Resonance in Medicine. 70:527-536 |
| ISSN: | 0740-3194 |
| DOI: | 10.1002/mrm.24480 |
| Popis: | Noncontrast-enhanced renal angiography techniques based on balanced steady-state free precession avoid external contrast agents, take advantage of high inherent blood signal from the T 2 / T 1 contrast mechanism, and have short steady-state free precession acquisition times. However, background suppression is limited; inflow times are inflexible; labeling region is difficult to define when tagging arterial flow; and scan times are long. To overcome these limitations, we propose the use of multiple inversion recovery preparatory pulses combined with alternating pulse repetition time balanced steady-state free precession to produce renal angiograms. Multiple inversion recovery uses selective spatial saturation followed by four nonselective inversion recovery pulses to concurrently null a wide range of background T 1 species while allowing for adjustable inflow times; alternating pulse repetition time steady-state free precession maintains vessel contrast and provides added fat suppression. The high level of suppression enables imaging in three-dimensional as well as projective two-dimensional formats, the latter of which has a scan time as short as one heartbeat. In vivo studies at 1.5 T demonstrate the superior vessel contrast of this technique. |
| Databáze: | OpenAIRE |
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