Noninvasive measurement of temperature for simulated tissue based on piezoelectric micromachined ultrasonic transducers

Abstract

This paper reports a noninvasive measurement of temperature for simulated tissue based on an AlN piezoelectric micromachined ultrasonic transducer (PMUT) array. Polydimethylsiloxane (PDMS) and a built-in heating plate are used to simulate the thermal therapy of human tissue. Based on time-of-flight (ToF) from the simulated tissue surface to the heating plate surface and corresponding temperature data, the piecewise linear fitting method is used to fit the ToF-temperature curve, and its sensitivity is 41.5 ns/℃ (below 50 ℃) and 30.5 ns/℃ (from 50 ℃ to 65 ℃). The average error of real-time temperature measurements is 0.58 ℃ for temperatures below 65 ℃. The proposed method can provide a good solution for temperature detection during thermal therapy.

Innovative Non-Invasive and Non-Intrusive Precision Thermometry in Stainless-Steel Tanks Using Ultrasound Transducers

“…Ultrasound has demonstrated its effectiveness in the scientific literature and industrial applications for measuring distance [ 13 ], flow velocity in pipes [ 14 ], and fluid levels in containers [ 15 ]. Ultrasound is commonly employed in medical applications, particularly for temperature imaging to diagnose carotid artery disease [ 16 ] and monitoring temperature during medical treatments like high-intensity focused ultrasound [ 17 , 18 ]. In certain industrial applications, furnaces are frequently utilized, and it is possible to visualize temperature distributions using acoustic tomography to ensure combustion stability [ 19 , 20 , 21 ].…”