Myocardial Contraction Fraction (MCF) Calculator
Calculates myocardial contraction fraction (MCF) from echocardiographic measurements.
Parameter(z) Projects
It all started with a question: Is this coronary artery dimension normal? Which then became: "Is this echo normal?
"What is normal?"
That turned into a spreadsheet (before Excel was a thing), which turned into a web page (before the iPhone was a thing), which turned into a domain (www.parameterz.com).
Mine is a special brand of laziness. I would rather spend hours of time up front building a tool to save me moments of time on every echo.
These are some of those tools.
Featured Projects
Ascending Aorta Area & Diameter ULN by CMR
Calculates upper limits of normal for ascending aorta area and diameter based on CMR data from the UK Biobank.
Cardiac Scaling
Explores various methods of scaling cardiac dimensions to body size, including allometric scaling. This is the companion site to a letter to the editors in JASE (2025).
Dilated Aorta Finder (Dilated AF)
Uses both the 2015 ASE GLs and the newer NORRE height-indexed data to identify dilated aortic dimensions in adults.
Normal Values
Ascending Aorta Area & Diameter ULN by CMR
Calculates upper limits of normal for ascending aorta area and diameter based on CMR data from the UK Biobank.
Fetal Echo Z-scores
Uses various publications to provide fetal cardiac z-scores based on EGA or other biometric measurements.
LV Mass Calculator
Calculates LV mass via the ASE formula then looks at various normal values for both pediatric and adults.
Dilated Aorta Finder (Dilated AF)
Uses both the 2015 ASE GLs and the newer NORRE height-indexed data to identify dilated aortic dimensions in adults.
Prosthetic Heart Valves Normal Values
Based on the 2024 JASE Guidelines; values for surgical and trans-catheter valves in all positions.
Echo/Clinical Tools
Myocardial Contraction Fraction (MCF) Calculator
Calculates myocardial contraction fraction (MCF) from echocardiographic measurements.
PAAT-Thing
Calculates PAAT-based estimated pulmonary pressures
Borderline LV Calculations
Calculates various scores (Rhodes, CHSS1 & 2, Discriminant) for the prediction of biventricular vs. uni-ventricular repair in the borderline LV.
Diastology
Algorithm navigator for the assessment of diastolic function according to numerous guidelines.
Teaching
Cardiac Scaling
Explores various methods of scaling cardiac dimensions to body size, including allometric scaling. This is the companion site to a letter to the editors in JASE (2025).
PISA Thing
Interactive calculator for proximal isovelocity surface area (PISA) and regurgitant flow. Also has a related calculator for MR RF via the volumetric method.