Simultaneous real-time multichannel M-mode and Doppler imaging in a miniature wearable ultrasound device

Le résumé fourni par la source

Wearable ultrasound systems face challenges for simultaneous structural and motion-sensitive imaging due to constraints on size, power, and data throughput. This work presents a miniature wearable ultrasound imaging system integrating simultaneous M-mode and Doppler measurements using time-delay spectrometry (TDS). TDS employs a low-voltage, wideband chirp to establish a deterministic relationship between reflector depth and frequency enabling separation of overlapping echoes in both time and frequency domains, enabling real-time estimation of depth-resolved tissue displacement and velocity from a single transmission sequence. The system architecture combines a single-element transducer, low-power (5V) excitation, and synchronized signal processing to extract M-mode and Doppler-derived tissue velocity profiles at multiple sites. Experiments using string phantoms and musculoskeletal motion demonstrated stable M-mode imaging and repeatable depth-resolved tissue velocity estimates. String phantom experiments demonstrated a strong linear relationship between Doppler frequency shift and true string velocity (Pearson r = 0.999, p < 10−13). Our wearable battery-powered system supports simultaneous M-mode and tissue velocity imaging at four sites at a frame rate of 400 Hz with an average current draw of 200mA. This work represents the first demonstration of a wearable ultrasound system enabling real-time tissue Doppler and M-mode measurements.

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