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A preliminary study: Cast-off bloodstain pattern analysis with HemoVision.

Savita Brickman-Maxwell¹, Eugene Liscio²

¹University of Toronto Mississauga, 3359 Mississauga Rd, Mississauga, ON L5L 1C6, Canada.

Forensic Science International

|April 22, 2026

Summary

This summary is machine-generated.

HemoVision software accurately estimates bloodstain patterns from crime scenes. This bloodstain pattern analysis (BPA) tool helps determine the area where a bloody weapon was swung.

Keywords:

Automated Bloodstain pattern analysis Cast-off bloodstain pattern HemoVision Software

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Area of Science:

Forensic Science
Biomechanical Analysis

Background:

Bloodstain pattern analysis (BPA) is crucial in forensic investigations.
Automated BPA software like HemoVision aids in documenting and analyzing bloodstains.

Purpose of the Study:

To evaluate the accuracy of HemoVision's cast-off bloodstain pattern analysis feature.
To assess HemoVision's ability to estimate the three-dimensional swing path of a weapon.

Main Methods:

Controlled cast-off bloodstain patterns were created using a wooden rig.
HemoVision software analyzed 36 patterns, including six blind trials.
Estimated swing path parameters (center of swing, radius) were compared to known values.

Main Results:

HemoVision demonstrated accuracy in estimating the center of swing across different trial types.
The x-axis (horizontal) estimation was most accurate, while the y-axis (vertical) was least accurate.
The software's tubular swing path envelope (TSPE) contained the actual swing path in all trials.

Conclusions:

HemoVision BPA software provides accurate estimations for cast-off bloodstain patterns.
The software can reliably define the area of weapon swing in forensic investigations.