Measuring medium-sized muscular arteries using a novel broadband 15-MHz linear array probe

Area of Science:

• Medical Imaging
• Ultrasound Technology
• Vascular Ultrasound

Background:

• Current ultrasound probes have limitations in resolving fine vascular structures.
• Accurate measurement of arterial diameter and intima-media thickness (IMT) is crucial for cardiovascular risk assessment.
• Interobserver variability can affect the reliability of vascular measurements.

Purpose of the Study:

• To evaluate the performance of a newly developed wideband 15-MHz linear array probe (15 M) for vascular imaging.
• To compare the resolution and measurement variability of the 15 M probe against 7.5-MHz and 10-MHz probes.
• To assess the intraobserver variability of the 15 M probe in measuring percent flow-mediated dilatation (%FMD).

Main Methods:

• A phantom model was used to assess axial and lateral resolution of the 15 M probe.
• Two observers independently acquired brachial and radial artery images from 17 male volunteers using 7.5 M, 10 M, and 15 M probes.
• Measurements included arterial diameter and intima-media thickness (IMT).
• Intraobserver variability for %FMD was assessed using the 15 M probe.

Main Results:

• The 15 M probe demonstrated better axial and lateral resolution than the 10-MHz probe.
• Coefficients of variation (CV) for diameter measurements were significantly lower with the 15 M probe (brachial artery: 1.5%, radial artery: 3.2%) compared to older probes.
• CV for IMT measurements of the brachial artery far wall was also reduced with the 15 M probe (8.5%).
• The CV for %FMD measurement using the 15 M probe was 4.6%.

Conclusions:

• The new 15-MHz ultrasound probe provides enhanced resolution and reduced measurement variability for medium-sized muscular arteries.
• The 15 M probe is suitable for accurate evaluation of arterial morphology and function.
• This technology has the potential to improve the reliability of vascular ultrasound assessments.