Advanced
Technical
IVT
PSIR
Also written as: PSIR — Phase-Sensitive Inversion Recovery
Phase-sensitive inversion recovery, an MRI sequence optimized for detecting myocardial scar tissue.
Full Definition
Phase-sensitive inversion recovery is an advanced cardiac MRI technique that provides superior contrast between normal myocardium and fibrotic tissue compared to conventional late gadolinium enhancement imaging. PSIR eliminates the need for precise inversion time optimization by using phase information to automatically null normal myocardium signal. This results in consistent image quality and improved detection of subendocardial infarcts and diffuse fibrosis patterns.
Usage
Usage note: Capitalize all letters when used as abbreviation.
In Context
- "PSIR images demonstrated extensive subendocardial enhancement consistent with non-ST elevation myocardial infarction." — Cardiac MRI interpretation
- "The PSIR sequence revealed patchy mid-wall enhancement suggestive of myocarditis." — Radiology report
Also known as
phase-sensitive IR
Don't confuse with
STIR
FLAIR
DIR