PYP Quantitative Uptake Index (QUI) Calculator
- PYP Quantitative Uptake Index (QUI): Explanation and Clinical Context
The PYP Quantitative Uptake Index (QUI) is a ratio of the radiotracer counts measured in the myocardial region of interest (ROI) to the contralateral chest ROI during 99mTc-Pyrophosphate (PYP) scintigraphy.
It is used to quantify myocardial uptake and improve the diagnostic accuracy for transthyretin cardiac amyloidosis (ATTR-CA).
A higher QUI value indicates more significant myocardial radiotracer accumulation. Typically, a QUI >1.5 is suggestive of clinically relevant myocardial amyloid deposition.
This index provides a reproducible, objective metric that can supplement visual scoring (Perugini grading) in clinical practice, enabling better risk stratification, disease monitoring, and follow-up of patients with suspected ATTR-CA.
Reference:
Falk RH, et al. "Noninvasive Evaluation of Cardiac Amyloidosis Using 99mTc-Pyrophosphate Scintigraphy." Circulation. 2013;127:920–929. doi:10.1161/CIRCULATIONAHA.112.000433
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