PSIR
Also written as: PSIR — Phase-Sensitive Inversion Recovery
Phase-sensitive inversion recovery sequence that optimizes contrast between normal myocardium and scar tissue in cardiac MRI.
Full Definition
Phase-sensitive inversion recovery (PSIR) is an advanced MRI pulse sequence used in cardiac imaging to enhance the contrast between normal myocardium and areas of fibrosis or scar tissue. Unlike conventional inversion recovery sequences, PSIR maintains phase information, allowing for better nulling of normal myocardium and improved visualization of pathological tissue. This sequence is particularly valuable in delayed enhancement imaging for detecting subtle areas of myocardial damage that might be missed with standard techniques.
Usage
Usage note: Always capitalize as PSIR when using the acronym.
In Context
- "PSIR sequences demonstrated subtle subendocardial enhancement not visible on standard imaging." — Cardiac MRI protocol
- "The PSIR technique improved detection of small areas of myocardial fibrosis." — Technical imaging note