![]() assumes an ellipsoid lesion (and thus the more the lesion deviates from this morphology the more inaccurate the calculated volume will be).There are some pitfalls with the ABC/2 method: SHπ/6 (or π/6SH): derived from ABCπ/6, and found to be the second-most accurate formula in one study after SH/2 7.SH/2 (or 1/2SH): derived from ABC/2 with the background theory that S will be slightly less than A x B, found to be the most accurate formula in one study (in comparison to other formulas including ABC/2) 7.formulas using the hematoma area in the maximally involved slice (S) and height (H or C):.2.5ABC/6 (or 2.5/6ABC): created to balance the over-estimation of ABC/2 and the under-estimation of ABC/3, has a greater accuracy than other formulas that use A, B, and C in one study 7.ABC/3 (or 1/3ABC): was created to balance the over-estimation of ABC/2, but tends to under-estimate instead 7. ![]() ![]() ABCπ/6 (or π/6ABC): the precursor formula (Tada formula) to ABC/2 where π is estimated as 3 instead 7.formulas using A, B, and C (as defined above):.In addition to the ABC/2 formula, there are other formulas which have been described and studied to estimate the volume of intracerebral hemorrhage 7: InterpretationĪ baseline intracerebral hemorrhage volume of >50-60 mL is a poor prognostic marker 1,5. If π (Greek letter pi) is approximated to 3, then the formula can be simplified to ABC/2 (in truth, π is an irrational number, starting 3.141.). where A, B and C are the three diameters of the ellipsoid as defined above.The above formula is a simplified version of the formula for the volume of an ellipsoid, which is: The volume does tend to overestimate the true volume, with errors increasing in more irregularly-shaped and larger hemorrhages 7. ![]() If the measurements are made in centimeters (cm), then the volume will be in cubic centimeters (cm 3) or milliliters (mL) (numerically equivalent).
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