Wearable Photoacoustic Imaging System.
Open Access
- Author:
- Datta, Gaurav Ramesh
- Graduate Program:
- Electrical Engineering
- Degree:
- Master of Science
- Document Type:
- Master Thesis
- Date of Defense:
- April 09, 2019
- Committee Members:
- Sri - Rajasekhar Kothapalli, Thesis Advisor/Co-Advisor
Mehdi Kiani, Committee Member
Zhiwen Liu, Committee Member - Keywords:
- Photoacoustic imaging
wearable
biomedical imaging
ultrasound transducers
portable
analog front end
bioinstrumentation
functional imaging - Abstract:
- Photoacoustic imaging is an emerging modality of imaging that combines advantages of high imaging depth of ultrasound and rich molecular contrast of optical imaging. Photoacoustic imaging employs a pulsed laser source of a known wavelength shined upon bio molecules or target that absorb the incoming photons from laser, undergoing thermo - elastic expansion, thereby generating pressure signals which manifest themselves in the form of ultrasound. The strength of ultrasound signal generated depends upon the optical fluence rate from the source, optical absorption coefficient of the target and intensity of incident light. In this project, we present a wearable sized photoacoustic imaging system that uses photoacoustic imaging modality to image phantoms. The device consists of a compact photoacoustic probe that consists of a custom - made ultrasound transducer and fiber coupled laser diode, coupled with various other compact sized components such as laser driver, pulse generator and power module. We perform photoacoustic imaging with the bench top wearable system on custom – made phantoms. Our current device is designed for a single A line scan channel, with future work being targeted for multiple channels as well as moving further in the direction of wearable technology by incorporating features such as wireless data transfer and developing ASICS.