Comparison of 1.5 and 3.0 T for contrast-enhanced pulmonary magnetic resonance angiography.
Clin Appl Thromb Hemost
; 18(2): 134-9, 2012.
Article
in En
| MEDLINE
| ID: mdl-21993980
ABSTRACT
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.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Pulmonary Embolism
/
Magnetic Resonance Angiography
/
Lung
Type of study:
Guideline
/
Observational_studies
Limits:
Humans
Language:
En
Journal:
Clin Appl Thromb Hemost
Journal subject:
ANGIOLOGIA
Year:
2012
Document type:
Article
Affiliation country: