Measuring the Compression Force Required for Vascular Shortening in Ultrasonic Vascular Models.

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Vascular Ultrasound

Background:

• Vascular compression assessment is crucial for deep vein thrombosis (DVT) screening.
• Quantitative pressure analysis of ultrasound vessel models is lacking.
• Current models may not accurately represent venous biomechanics.

Purpose of the Study:

• To compare the compressive force required for 50% diameter reduction in a human popliteal vein and various ultrasound vascular models.
• To provide objective numerical data on the compressibility of ultrasound phantoms.
• To inform the development of more realistic vascular ultrasound training models.

Main Methods:

• Utilized a pressure-sensitive device to measure compressive force.
• Compared four commercially available ultrasound vascular models and one human popliteal vein.
• Standardized compression to achieve a 50% reduction in vessel diameter.

Main Results:

• Human popliteal vein required 191 ± 65 g of force for 50% compression.
• Ultrasound models required significantly higher forces: Blue Phantom (701 ± 8 g), CV Pad II (265 ± 12 g), Training Block (697 ± 20 g), UGP-GEL (745 ± 15 g).
• The ultrasound training block and UGP-GEL required 2.6 times more force than the CV Pad II, despite similar gel materials.

Conclusions:

• Objective compressive force values are necessary for evaluating ultrasound vascular models.
• Existing models do not accurately replicate the compressibility of human veins.
• Modifications like removing vascular structures or using thinner tubing are needed for realistic vein compressibility simulation.