Myocardial first-pass perfusion assessment using rotational long-axis MRI

Area of Science:

• Cardiovascular imaging
• Magnetic Resonance Imaging (MRI)
• Myocardial perfusion

Background:

• First-pass myocardial perfusion imaging is crucial for diagnosing various cardiac conditions.
• Conventional short-axis imaging techniques may have limitations in fully visualizing the entire myocardium, particularly the basal and apical segments.
• Optimizing imaging protocols is essential for accurate assessment of myocardial perfusion.

Purpose of the Study:

• To evaluate a novel rotational long-axis (RLA) first-pass myocardial perfusion imaging method.
• To assess the ability of RLA imaging to improve myocardial coverage and delineate basal and apical regions.
• To compare RLA imaging with conventional parallel short-axis (PSA) imaging.

Main Methods:

• The rotational long-axis (RLA) method was investigated in 12 healthy volunteers.
• RLA and conventional parallel short-axis (PSA) first-pass perfusion images were acquired using identical TrueFISP parameters.
• Image analysis focused on contrast-to-noise ratio (CNR), relative signal upslope, and myocardial coverage.

Main Results:

• RLA imaging demonstrated an average of 30% improvement in total myocardial area imaged compared to PSA.
• Basal and apical myocardial segments were visualized with RLA but not with PSA.
• Mean CNR and relative signal upslope were comparable between RLA and PSA techniques.

Conclusions:

• The rotational long-axis (RLA) perfusion imaging technique offers superior myocardial coverage compared to conventional PSA.
• RLA imaging provides better delineation of the basal and apical regions of the left ventricle.
• This RLA approach enhances the diagnostic potential of first-pass myocardial perfusion imaging.