Cardiac magnetic resonance parallel imaging at 3.0 Tesla: Technical feasibility and advantages
| Autor: | Le Roy Blawat, Kevin F. King, Lisa Angelos, Kiaran P. McGee, Josef Phillip Debbins, Ed Boskamp |
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| Rok vydání: | 2004 |
| Předmět: |
Adult
Male Time Factors Materials science Field strength Sensitivity and Specificity Imaging phantom Magnetics Nuclear magnetic resonance Reference Values Cardiac magnetic resonance imaging medicine Humans Radiology Nuclear Medicine and imaging Analysis of Variance medicine.diagnostic_test Phantoms Imaging business.industry RF power amplifier Specific absorption rate Heart Signal Processing Computer-Assisted Magnetic resonance imaging Image Enhancement equipment and supplies Magnetic Resonance Imaging cardiovascular system Feasibility Studies Parallel imaging Artifacts Nuclear medicine business Cardiac magnetic resonance circulatory and respiratory physiology |
| Zdroj: | Journal of Magnetic Resonance Imaging. 19:291-297 |
| ISSN: | 1522-2586 1053-1807 |
| DOI: | 10.1002/jmri.20015 |
| Popis: | Purpose To quantify changes in signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), specific absorption rate (SAR), RF power deposition, and imaging time in cardiac magnetic resonance imaging with and without the application of parallel imaging at 1.5 T and 3.0 T. Materials and Methods Phantom and volunteer data were acquired at 1.5 T and 3.0 T with and without parallel imaging. Results Doubling field strength increased phantom SNR by a factor of 1.83. In volunteer data, SNR and CNR values increased by factors of 1.86 and 1.35, respectively. Parallel imaging (reduction factor = 2) decreased phantom SNR by a factor of 1.84 and 2.07 when compared to the full acquisition at 1.5 T and 3.0 T, respectively. In volunteers, SNR and CNR decreased by factors of 2.65 and 2.05 at 1.5 T and 1.99 and 1.75 at 3.0 T, respectively. Doubling the field strength produces a nine-fold increase in SAR (0.0751 to 0.674 W/kg). Parallel imaging reduced the total RF power deposition by a factor of two at both field strengths. Conclusions Parallel imaging decreases total scan time at the expense of SNR and CNR. These losses are compensated at higher field strengths. Parallel imaging is effective at reducing total power deposition by reducing total scan time. J. Magn. Reson. Imaging 2004;19:291–297. © 2004 Wiley-Liss, Inc. |
| Databáze: | OpenAIRE |
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