FWHM measurement
Pronunciation: F-W-H-M
Full width at half maximum quantification used in nuclear cardiology to assess myocardial perfusion defect size and severity.
Full Definition
Full Width at Half Maximum (FWHM) measurement is a quantitative technique used in nuclear cardiology to objectively assess the size and severity of myocardial perfusion defects. The measurement determines the width of a perfusion abnormality at half of its maximum intensity, providing standardized defect quantification. FWHM analysis is particularly valuable in SPECT and PET imaging for comparing serial studies, assessing treatment response, and research applications. This method reduces subjective interpretation variability and provides reproducible measurements for tracking changes in perfusion patterns over time. FWHM values are typically expressed in degrees or as a percentage of the left ventricular circumference.
Usage
Usage note: Include units (degrees or percentage) when reporting FWHM values.
In Context
- "FWHM measurement of the anterior perfusion defect was 45 degrees, indicating moderate extent." — Nuclear cardiology report
- "Serial FWHM measurements demonstrated progressive improvement following revascularization therapy." — Follow-up imaging study