Qué hace esta calculadora
Estimates gland volume from three orthogonal dimensions and optionally calculates PSA density.
Enter length, width, height, formula preference, and PSA when available.
Antes del cálculo
- Measure three orthogonal gland dimensions on the same examination and choose the intended geometric formula.
- Use a serum PSA value that belongs to the relevant clinical time point and note recent procedures or inflammation.
Alcance clínico
Use this calculator to estimate prostate volume from three orthogonal dimensions on ultrasound, MRI, or CT and optionally calculate PSA density from serum PSA divided by estimated gland volume.
Aplicabilidad y exclusiones
- Do not mix dimensions from different examinations, planes, or time points.
- Post-surgical anatomy, marked contour irregularity, and segmentation-based volumes may not be represented accurately by a geometric formula.
Método y lógica de cálculo
The ellipsoid estimate multiplies width, length, and height by π/6 (approximately 0.52). PSA density is serum PSA in ng/mL divided by volume in mL. The bullet formula uses a different geometric coefficient and should be identified in the report.
Ellipsoid volume = width × length × height × π/6PSA density = serum PSA (ng/mL) / prostate volume (mL)Tabla de interpretación
| Output | Meaning |
|---|---|
| Volume (mL) | Geometric estimate of gland volume |
| PSA density (ng/mL²) | PSA normalized to estimated volume; interpret in the full clinical pathway |
Errores frecuentes
- Mixing units, planes, or dimensions from different examinations.
- Treating a PSA-density threshold as universal without considering technique, population, MRI, and clinical context.
The volume is a geometric estimate, and PSA density inherits uncertainty from both the volume and PSA measurements.
Ejemplo práctico
Caso: Fictional example: width 50 mm, length 40 mm, height 36 mm, PSA 6 ng/mL.
Cálculo: Ellipsoid volume ≈ 50 × 40 × 36 × 0.523 / 1000 = 37.7 mL; PSA density ≈ 6/37.7 = 0.16 ng/mL².
Interpretación: Report the formula, units, and examination used; do not interpret PSA density without age, PSA trend, MRI, and clinical context.
Cómo usar esta calculadora
- Completa los campos visibles de imagen y medición. Los datos obligatorios están indicados en la herramienta.
- Revisa la categoría, la puntuación, las mediciones y cualquier recomendación o advertencia calculada.
- Copia el texto para el informe solo después de comprobar el resultado con la exploración completa y la guía de referencia.
Preguntas sobre esta calculadora
Why can MRI and ultrasound volumes differ?
Plane selection, caliper placement, gland shape, and the geometric approximation all introduce variability.
Is there one universal PSA-density cutoff?
No. Thresholds depend on the clinical pathway and guideline; use the calculated value with MRI findings and patient factors.
¿Se envían las mediciones de pacientes a RadPhrases?
No. Los datos introducidos y los resultados se procesan en el navegador y esta página no los envía.