ICH Volume Calculator

The calculator relies on standard radiological formulas to estimate three-dimensional blood volume from two-dimensional CT or MRI scans. Depending on the chosen hemisphericity or shape factor (HemShape), the calculation incorporates the length, width, slice thickness, and number of slices. A common method for approximation uses the formula: Volume = (Length × Width × Slice Width × Number of Slices) / HemShape. For ellipsoid hemorrhages, the divisor is typically 2, correcting for the rounded boundaries of the bleed.

Imagine a patient with a CT scan showing an intracerebral hemorrhage. The radiologist measures a maximum length of 5.0 cm and a maximum width of 3.0 cm across the axial slices. The scan utilizes a slice width of 0.5 cm, spanning 4 slices through the core of the hematoma. Assuming a standard ellipsoid correction factor (HemShape = 2), the calculation proceeds as follows: First, multiply length by width by slice width and number of slices (5.0 × 3.0 × 0.5 × 4 = 30). Next, divide by the HemShape factor of 2. The resulting estimated ICH volume is 15 cubic centimeters (cc) or milliliters.

Ensure that all linear measurements are converted to the same unit of measurement, typically centimeters, before initiating the calculation. Always verify the slice width setting directly from the DICOM metadata of the neuroimaging study to prevent scaling errors. Remember that automated or manual volume estimations serve as supportive clinical indicators and must be evaluated alongside the patient's neurological exam and overall clinical presentation.