Modeling and simulation of ultrasonic backscattering effects as intrabody communication application based on PMUT arrays
Başlık çevirisi mevcut değil.
- Tez No: 852120
- Danışmanlar: Belirtilmemiş.
- Tez Türü: Yüksek Lisans
- Konular: Metalurji Mühendisliği, Metallurgical Engineering
- Anahtar Kelimeler: Acoustic Backscattering, Time of Flight (TOF), Implantable Medical Devices (IMD), Intrabody Communication (IBC), Piezoelectric Micromachined Ultrasonic Transducers (PMUTs), Neural Dust, Ultrasound
- Yıl: 2022
- Dil: İngilizce
- Üniversite: Politecnico di Milano
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 100
Özet
Recent developments in biomedical engineering have brought forward an urgent need for effective wireless communication and power delivery technologies. Collectively known as Intrabody Communication (IBC), these technologies utilize various methods to deliver data such as electromagnetic waves, photons, and ultrasound. This study proposes a unidirectional communication system that exploits the scattering properties of ultrasound waves; in order to transfer data from the implanted medical device (IMD) to an external transducer array. The external acoustic wave transmission and reception are done through Microelectromechanical Systems (MEMS) ultrasonic transducers, which are employed as an array of Piezoelectric Micromachined Ultrasonic Transducers (PMUTs). While the IMD is selected to be the neural dust that records peripheral nerve activity, this method of data transfer applies to various implants that adopt ultrasonic IBC. In the peripheral nervous system, the neural messages are transferred through an electrochemical polarization called the action potential. These neural action potential voltages are then approximated and imposed on the simulated neural dust piezoelectric material. This communication scheme aims to transfer this implant voltage data to the external probe as accurately as possible. The proposed model tries to achieve this flow of information by sending an excitation signal to induce an acoustic echo and estimate the input action potential voltages using the ultrasonic backscattering wave collected by the external PMUT array. The total time traveled by the backscattering echo is called the time of flight (TOF). Using the frequency and phase content of the acoustic echo, various TOF values are collected throughout the full span of the neural dust input voltage. Distinct data points collected using this method can then be interpolated to estimate the behavior of the neuron.
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