A Narrow PMUT Array for Wearable Ultrasound Imaging
A compact 64-element micromachined ultrasound array was evaluated on phantoms and in volunteer imaging demonstrations.
A small array with a specific trade-off
Piezoelectric micromachined ultrasonic transducers (PMUTs) are attractive for compact imaging because they can be fabricated using microelectromechanical systems processes. Arrays still need a uniform response across their elements, adequate bandwidth, and enough aperture to form useful images.
In Microsystems & Nanoengineering, researchers modeled mutual acoustic coupling between array cells and used that analysis to guide the layout of a narrow aluminum-nitride PMUT array.
Reported device performance
The prototype contained 64 elements in a 1 cm by 0.15 cm footprint. The paper reports a centre frequency of 7 MHz, fractional bandwidth above 60%, and image contrast near 50 dB. Measured lateral and axial resolutions were about 0.26 mm and 0.25 mm, respectively. The team also showed real-time images of superficial structures—including the carotid artery, thyroid, and dorsalis pedis artery—in volunteers.
These demonstrations show that the array can form images in a compact configuration. They do not establish diagnostic accuracy, long-term wearable performance, or clinical benefit for a particular disease.
What should be evaluated next
Future work can compare this form factor with standard probes for defined clinical tasks, across more participants and operators. It should report image quality under motion, coupling changes, and practical attachment conditions, not only acoustic measures.
The paper links array geometry to acoustic uniformity and device integration. That engineering connection is valuable, while the volunteer images remain an early feasibility step.
Source and credit
Independent summary of “High-uniformity miniaturized PMUT array with broadband and high-sensitivity for wearable ultrasound imaging,” Microsystems & Nanoengineering, published 22 May 2026. Original paper, DOI: 10.1038/s41378-026-01331-z. Source article license: CC BY-NC-ND 4.0. No source figures or tables are reproduced here.
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