Capacitive micromachined ultrasound transducer for tomography

• Grant number: 18/00710-1
• Support Opportunities: Scholarships abroad - Research
• Start date: May 01, 2018
• End date: April 30, 2019
• Field of knowledge: Engineering - Biomedical Engineering - Medical Engineering
• Principal Investigator: Chi Nan Pai
• Grantee: Chi Nan Pai
• Host Investigator: Butrus (Pierre) Khuri-Yakub
• Host Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Institution abroad: Stanford University, United States

Abstract

Ultrasound imaging is a non-invasive form to obtain images of human body. Ultrasound tomography is a new type of ultrasound imaging that has been developed by the research group of the proponent, in order to acquire functional images of cardiorespiratory system in thorax, especially for treatment of patients under mechanical ventilation inside Intensive Care Units, and also to acquire morphological images to substitute mammogram, in patients with breast cancer. The proponent of this proposal has experience in development of piezoelectric ultrasound transducers. However, a novel technology, unavailable in Brazil, denominated capacitive micromachined ultrasound transducers, has the potential to be more adequate for the cited applications. The objective of this proposal is to learn this novel technology, with the research group of Prof. Khuri-Yakub, in the Stanford University, so that transducers for ultrasound tomography system can be developed. It is agreed with Prof. Khuri-Yakub that the proponent will be working with graduate students and associate researchers of the laboratory in order to learn the technology. This will be done by modelling, simulating, fabricating and evaluating the transducers required in the existing projects in Stanford. Later, with enough knowledge, transducers for ultrasound tomography will be modelled, simulated and fabricated for lung imaging. The simulation will be done by using the software Field II and considering only the rectangular elements of the transducer, and the fabrication will be performed by cutting deeply the silicon substrate to separate the elements, and by filling the gaps with polydimethylsilozane (PMDS) in order to obtain a flexible transducer.

Scientific publications

(4)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

GU, LEI; STEDMAN, QUINTIN; RASMUSSEN, MORTEN; PAI, CHI-NAN; BRENNER, KEVIN; MA, BO; ERGUN, ARIF SANLI; KHURI-YAKUB, BUTRUS; DAVILA, JUAN RIVAS; IEEE. Multiphase GaN Class-D Resonant Amplifier for High-Intensity Focused Ultrasound. 2019 IEEE 20TH WORKSHOP ON CONTROL AND MODELING FOR POWER ELECTRONICS (COMPEL), v. N/A, p. 6-pg., 2019-01-01. (18/00710-1)

STEDMAN, QUINTIN; GU, LEI; PAI, CHI-NAN; RASMUSSEN, MORTEN; BRENNER, KEVIN; MA, BO; ERGUN, ARIF SANLI; DAVILA, JUAN RIVAS; KHURI-YAKUB, BUTRUS; IEEE. Compact Fast-Switching DC and Resonant RF Drivers for a Dual-Mode Imaging and HIFU 2D CMUT Array. 2019 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS), v. N/A, p. 4-pg., 2019-01-01. (18/00710-1)

KIM, YOUNG HUN; KANG, KI CHANG; KIM, JEONG NYEON; PAI, CHI NAN; ZHANG, YICHI; GHANOUNI, PEJMAN; PARK, KWAN KYU; FIROUZI, KAMYAR; KHURI-YAKUB, BURTUS T.. ATTERNED INTERFERENCE RADIATION FORCE FOR TRANSCRANIAL NEUROMODULATIO. ULTRASOUND IN MEDICINE AND BIOLOGY, v. 48, n. 3, p. 497-511, MAR 2022. (18/00710-1)

HONDA, SATOSHI; OKA, MINAMI; FUKE, KAZUKI; KHURI-YAKUB, PIERRE T. T.; PAI, CHI NAN. Acoustodynamic Covalent Materials Engineering for the Remote Control of Physical Properties Inside Materials. Advanced Materials, v. N/A, p. 9-pg., 2023-07-20. (18/00710-1)