Computational design of foldable origami-based compressive ultrasound sensing

Folding paper to see inside the body

Ultrasound scans are a workhorse of modern medicine, from monitoring pregnancies to tracking heart disease. Yet the machines behind these familiar gray images are bulky and expensive because they rely on hundreds of tiny sensors and complex electronics. This study explores a surprising alternative: using foldable origami structures as a single, shape-shifting ultrasound sensor that could one day shrink powerful imaging systems into compact, even wearable devices.

Why ultrasound machines are so complex

Conventional ultrasound systems use large arrays of individual detectors to build up detailed pictures of tissues in real time. As doctors push for more advanced techniques, such as three-dimensional and super‑resolution imaging of blood vessels, the number of channels and the volume of data keep growing. Researchers have tried to simplify the hardware by borrowing ideas from compressed sensing, where smart processing compensates for fewer measurements. Some single-detector approaches already exist, but they rely on scattering sound through complex structures, which tends to waste acoustic energy and dull the sensor’s sensitivity.

Turning a sheet into a smart sound collector

The authors introduce a new concept called Foldable Origami-based Compressive Ultrasound Sensing, or FOCUS. Instead of placing additional scattering material between the body and the detector, FOCUS builds the sensing function into the surface of a foldable origami transducer itself. A thin piezoelectric layer, which converts sound into electrical signals, is attached to an engineered crease pattern. By driving the structure through a series of well‑defined folding states, the device effectively “looks” at the same region of tissue in many different ways using only one electronic readout channel. Each folding state produces a unique acoustic fingerprint of the hidden structures, and a reconstruction algorithm then combines all of these fingerprints into a two‑ or three‑dimensional image.

Designing the best fold for clear pictures

Designing such an origami sheet by intuition alone would miss most of the possible shapes. The team instead treats the crease pattern as a high‑dimensional design space and searches it computationally. They focus on a family of crease patterns that can fold smoothly with a single driving motion while staying relatively flat and compact. For each candidate pattern, computer simulations calculate how ultrasound waves respond at several folding angles and assemble these responses into a large matrix that captures how each point in the tissue influences the single sensor. To judge quality, the researchers use a “minimum coherence” principle: the more independent the responses from different tissue locations are, the easier it is to reconstruct a clear image. This objective can be evaluated efficiently and does not depend on a specific training set of example images.

Testing image quality and robustness

Using this design strategy, the authors obtain an optimized crease pattern and compare it with both a standard, regularly repeating origami layout and with a pattern tuned directly on a fixed training set of synthetic images. In simulations, the minimum‑coherence design reconstructs a diverse set of test targets—including isolated points, vessel‑like structures, and a simple 3D object—with higher structural similarity and more faithful shapes than the alternatives, especially for images it was never explicitly optimized for. The acoustic sensitivity pattern of the optimized device is intentionally irregular rather than repetitive, which helps compressed sensing algorithms distinguish nearby features. The team also shows that image quality degrades only modestly when realistic electrical noise is added or when small geometric imperfections are introduced into the crease pattern, suggesting that the concept can tolerate practical manufacturing and operating conditions.

From simulation to future bedside tools

While this work is purely computational, it charts a path toward single‑channel ultrasound or optoacoustic imagers that are much smaller and simpler than today’s multichannel systems. A future FOCUS device might be built from thin piezoelectric films bonded to a foldable frame and driven by small mechanical actuators, trading sheer speed for portability and lower cost. If realized experimentally, such origami‑based sensors could enable compact or even wearable scanners tailored to long‑term monitoring of chronic diseases, and the same design framework could inspire other foldable devices that capture complex physical fields with minimal hardware.

Citation: Hochuli, N., Wünsch, T., Li, W. et al. Computational design of foldable origami-based compressive ultrasound sensing. Sci Rep 16, 6839 (2026). https://doi.org/10.1038/s41598-026-37215-5

Keywords: ultrasound imaging, compressed sensing, origami transducer, single-pixel imaging, wearable medical devices