Comparison of 1.5 and 3.0 T for Contrast-Enhanced Pulmonary Magnetic Resonance Angiography
| Autor: | John G. Weg, Robert L. Eisner, H. Dirk Sostman, Paul D. Stein, Alexander Gottschalk, Suzan E. Lowe, Sarah E. Fowler, Russell D. Hull, Kenneth V. Leeper, Pamela K. Woodard, Charles A. Hales, Frank J. Londy, Thomas L. Chenevert, David P. Naidich, Kathleen A. Jablonski |
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| Rok vydání: | 2011 |
| Předmět: |
medicine.medical_specialty
media_common.quotation_subject Contrast Media Aorta Thoracic Gadolinium Pulmonary Artery Signal-To-Noise Ratio Article Magnetic resonance angiography medicine.artery Retrospective analysis medicine Humans Multicenter Studies as Topic Contrast (vision) Thoracic aorta Lung Retrospective Studies media_common medicine.diagnostic_test business.industry Objective measurement Hematology General Medicine Image Enhancement medicine.disease Pulmonary embolism Magnetic Fields medicine.anatomical_structure Clinical Trials Phase III as Topic Pulmonary Veins Radiology Bolus (digestion) Pulmonary Embolism business Magnetic Resonance Angiography |
| Zdroj: | Clinical and Applied Thrombosis/Hemostasis. 18:134-139 |
| ISSN: | 1938-2723 1076-0296 |
| Popis: | Objective: In a recent multi-center trial of gadolinium contrast-enhanced magnetic resonance angiography (Gd-MRA) for diagnosis of acute pulmonary embolism (PE), two centers utilized a common MRI platform though at different field strengths (1.5T and 3T) and realized a signal-to-noise gain with the 3T platform. This retrospective analysis investigates this gain in signal-to-noise of pulmonary vascular targets. Methods: Thirty consecutive pulmonary MRA examinations acquired on a 1.5T system at one institution were compared to 30 consecutive pulmonary MRA examinations acquired on a 3T system at a different institution. Both systems were from the same MRI manufacturer and both used the same Gd-MRA pulse sequence, although there were some protocol adjustments made due to field strength differences. Region-of-interests were manually defined on the main pulmonary artery, 4 pulmonary veins, thoracic aorta, and background lung for objective measurement of signal-to-noise, contrast-to-noise, and bolus timing bias between centers. Results: The 3T pulmonary MRA protocol achieved higher spatial resolution yet maintained significantly higher signal-to-noise ratio (≥13%, p = 0.03) in the main pulmonary vessels relative to 1.5T. There was no evidence of operator bias in bolus timing or patient hemodynamic differences between groups. Conclusion: Relative to 1.5T, higher spatial resolution Gd-MRA can be achieved at 3T with a sustained or greater signal-to-noise ratio of enhanced vasculature. |
| Databáze: | OpenAIRE |
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