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Abstract #1657

Detectability of Pulmonary Embolism by contrast-free MR Angiography at 0.55T

Rudy Rizzo1, Radhika Rajeev1, Jacob Richardson1, Yatin Sharma2, Mauricio Stanzione Galizia1, Christopher Fung3, Vikas Gulani1, and Nicole Seiberlich1
1Department of Radiology, University of Michigan, Ann Arbor, MI, United States, 2Siemens Healthineers, Gurugram, India, 3Department of Emergency Medicine, University of Michigan, Ann Arbor, MI, United States

Synopsis

Keywords: Lung, Lung

Motivation: CT Pulmonary Angiography (CTPA) is the gold standard for rapid PE diagnosis, yet an alternative is needed for patients unsuitable for CTPA. Whole-body 0.55T MR scanners may improve MRI accessibility in high-volume settings and, with reduced B0 inhomogeneity, are promising for lung imaging.

Goal(s): Investigate the detectability of PE by non-contrast MR Angiography at 0.55T

Approach: 3D non-contrast free-breathing T2-weighted Turbo Spin Echo sequence imaged one patient. Two cardiothoracic radiologists evaluated the MRA and CTPA modalities, reporting diagnostic confidence.

Results: High diagnostic confidence and image quality in MRA, rating it comparable to CTPA, with good visualization of pulmonary arteries to the segmental level.

Impact: Whole-body 0.55T MR scanners, with reduced air-tissue interface susceptibility, offer a preliminary promising alternative to CTPA for detecting pulmonary embolism (PE) in patients for whom CTPA is unsuitable, potentially enabling non-contrast PE detection in high-volume clinical settings.

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Keywords