Ultrasonic energy-based technique for characterizing atherosclerosis

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Cardiovascular Research

Background:

• Atherosclerosis is a progressive disease affecting the aorta.
• Accurate characterization of atherosclerotic disease is crucial for patient management.
• Existing ultrasonic methods may be susceptible to artifacts.

Purpose of the Study:

• To develop and validate novel ultrasonic indices for characterizing atherosclerotic disease in human aortic specimens.
• To minimize phase cancellation artifacts using energy evaluation of broadband pulsed ultrasound.
• To assess both internal and surface properties of the aorta affected by atherosclerosis.

Main Methods:

• Development of two indices based on energy evaluation of broadband pulsed ultrasound.
• Derivation of indices from the transfer function H(f) of aortic specimens.
• Calculation of the slope of ln H(f) for absorption and scattering assessment.
• Calculation of the integral of ln H(f) for internal and intimal surface property evaluation.

Main Results:

• The developed indices effectively characterize atherosclerotic disease progression.
• Methods evaluating signal loss within aortic thickness are insensitive to surface irregularities and incident angle.
• The indices reflect changes in both aortic thickness and surface acoustic properties.

Conclusions:

• The novel ultrasonic indices provide a robust method for characterizing atherosclerotic disease.
• These indices allow for the complete progression of atherosclerosis to be followed non-invasively.
• The techniques minimize artifacts, offering more reliable assessments of aortic tissue.