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Technical Note: Impact of Linear Array Transducer Doppler Aperture Location on Spectral Peak Velocity Measurements -
Zaiyang Long1, Nicholas J Hangiandreou1, Thanila A Macedo2
1Department of Radiology, Mayo Clinic, Rochester, MN, USA.
Ultrasound in Medicine & Biology
|June 7, 2024
Summary
Ultrasound Doppler beam steering from linear array transducer edges significantly reduces peak velocity (PV) measurements compared to center apertures. This finding highlights the importance of controlling aperture location for consistent vascular ultrasound velocity assessments.
Area of Science:
- Medical Imaging
- Ultrasound Technology
- Vascular Ultrasound
Background:
- Ultrasound beam steering from linear array transducer edges is crucial for achieving desired Doppler angles in vascular exams.
- Accurate peak velocity (PV) measurements are essential for diagnosing vascular conditions.
Purpose of the Study:
- To evaluate the impact of using edge apertures versus center apertures on peak velocity (PV) measurements in vascular ultrasound.
- To determine if aperture location affects the accuracy of PV measurements.
Main Methods:
- A phantom study was conducted using three ultrasound systems and eight transducers from major vendors.
- Spectral Doppler measurements were performed with apertures at the array edge and center using a flow phantom.
- PVs were compared across four constant flow rates for each scanner-transducer combination.
Main Results:
- Averaged PVs from the center aperture were significantly greater than those from the edge aperture across all tested flow rates (p < 0.001).
- Relative PV differences between center and edge apertures ranged from 6.7% to 19.4%.
Conclusions:
- Consistently lower PVs were observed with the Doppler beam aperture at the array edge compared to the center.
- Variations in Doppler aperture location can influence PV measurements, emphasizing the need for control in clinical applications.
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