A digital sonomicrometer for two-point length and velocity measurements

Area of Science:

• Biomedical Engineering
• Cardiovascular Research
• Medical Instrumentation

Background:

• Accurate measurement of myocardial motion is crucial in experimental cardiology.
• Existing sonomicrometers may have limitations in resolution, cost, or ease of use.

Purpose of the Study:

• To design, fabricate, and test an improved digital sonomicrometer for two-point ultrasound measurements.
• To enhance precision, stability, and operational simplicity for laboratory use.

Main Methods:

• System design incorporating advanced analog and digital circuitry.
• In vitro calibration and evaluation using an open-chest dog model.
• Measurement of myocardial contractile motion.

Main Results:

• The digital sonomicrometer demonstrated capability for analog or digital output.
• Achieved a resolution of +/- 0.15 mm, adjustable to +/- 0.03 mm.
• Exhibited excellent stability, low cost, and ease of operation.

Conclusions:

• The improved digital sonomicrometer is a viable tool for experimental cardiology.
• The device facilitates accurate assessment of cardiac motion with enhanced usability.
• This technology offers a cost-effective solution for ultrasound-based physiological measurements.