1. What is a Prostate Volume Calculator?

Definition: This calculator estimates prostate volume using the ellipsoid formula based on length, width, and height measurements from radiological imaging.

Purpose: It helps radiologists and urologists assess prostate size for diagnostic and treatment planning purposes.

2. How Does the Calculator Work?

The calculator uses the ellipsoid formula:

Where:

• \( V \) — Prostate volume (cm³)
• \( L \) — Length (cm)
• \( W \) — Width (cm)
• \( H \) — Height (cm)

Explanation: The formula approximates the prostate as an ellipsoid shape, which is the standard method in radiological practice.

3. Importance of Prostate Volume Calculation

Details: Accurate volume measurement is crucial for diagnosing benign prostatic hyperplasia (BPH), planning surgical interventions, and assessing cancer risk.

4. Using the Calculator

Tips: Enter the maximum dimensions in three orthogonal planes (typically from TRUS or MRI). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What imaging modalities can provide these measurements?
A: Transrectal ultrasound (TRUS), MRI, and CT scans can all provide the necessary dimensions.

Q2: What is a normal prostate volume?
A: Typically 20-30 cm³ in young men, often increasing with age (may exceed 100 cm³ in BPH).

Q3: How does this compare to the prostate-specific antigen (PSA) density calculation?
A: PSA density is calculated by dividing the PSA level by the prostate volume (PSA ng/mL ÷ volume cm³).

Q4: Why use the ellipsoid formula instead of planimetry?
A: The ellipsoid formula is quicker and sufficiently accurate for clinical purposes, while planimetry is more precise but time-consuming.

Q5: Can this calculator estimate prostate weight?
A: Yes, multiply the volume by 1.05 g/cm³ (approximate tissue density) to estimate weight in grams.