VDP Healthy Reference Calculator
129Xe VDP Healthy Reference Calculator
Estimate age- and sex-specific healthy reference values, upper limit of normal, and z-scores for hyperpolarized 129Xe MRI ventilation defect percent across commonly used VDP quantification methods.
Single Subject Calculator
Batch Excel Calculator
Required columns: SubjectID, Age, Sex. Optional: method-specific VDP columns
such as TH60, Kmeans, AKmeans, LBmean, GLBmean, GLB99p,
or one generic VDP column with the selected method.
Reference Curve and Results
Median VDP (%)
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SD (%)
—
ULN (%)
—
z-score
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Z-score interpretation
- z = 0 → exactly average healthy value
- z = 1.64 → approximately the 95th percentile (ULN threshold)
- z > 2 → clearly abnormal
Observed VDP is used only to calculate the z-score. The plot displays the predicted median and ULN curves for the selected method and sex, with values marked at the selected age.