phase-sensitive reconstruction
MRI post-processing technique that restores signal polarity in inversion recovery sequences, improving contrast resolution.
Full Definition
Phase-sensitive reconstruction (PSR) is an advanced MRI post-processing method that recovers the polarity of signals in inversion recovery sequences, particularly valuable in late gadolinium enhancement (LGE) imaging. Traditional magnitude reconstruction loses phase information, making it difficult to distinguish between normal myocardium and tissues with intermediate T1 values. PSR restores positive and negative signal phases, creating images where normal myocardium appears dark gray, scar tissue appears bright white, and tissues with intermediate enhancement appear black. This technique significantly improves contrast-to-noise ratio and enables better detection of subtle enhancement patterns, particularly useful for identifying small infarcts and diffuse fibrosis.
Usage
Usage note: Specify when PSR is used in LGE imaging protocols for technical accuracy.
In Context
- "Phase-sensitive reconstruction improved visualization of the small subendocardial enhancement in the lateral wall." — Cardiac MRI technical report
- "The LGE images were processed using phase-sensitive reconstruction to optimize scar detection." — Imaging protocol description