Title:
Reduced-wire readout systems-on-chip for high-frequency intravascular ultrasound imaging
Reduced-wire readout systems-on-chip for high-frequency intravascular ultrasound imaging
Author(s)
Lim, Jaemyung
Advisor(s)
Ghovanloo, Maysam
Editor(s)
Collections
Supplementary to
Permanent Link
Abstract
The objective of the proposed research is to minimize and integrate intravascular ultrasound imaging (IVUS) system on a guidewire and to develop wireless data communication for general capacitive micromachined ultrasonic transducer (CMUT) based ultrasound imaging system. Several innovative system- and circuit-level techniques are proposed towards the development of CMUT modeling, optimizing front-end circuits, wireless data communication, and inductive power transmission to reduce the system size and the required number of interconnections. Since it provides real-time and high-resolution images of the arteries with negligible side effects, intravascular ultra- sound (IVUS) has been a common imaging modality for cardio-vascular interventions. Current solid-state IVUS catheters (3F-8.2F in diameter) are bulky, cannot reach to lesions in narrow arteries, and require an additional catheter exchange, prolonging the critical cardio-vascular procedures. To address this issue, the way to integrate ASIC and CMUT array on a guidewire by reducing the number of connections is proposed in this research. The proposed research presents three approaches to design and implement the reduced-wire IVUS system: 1) optimized the front-end circuit with properly modeled CMUT equivalent circuits, 2) on-chip quadrature sampler with time-division multiplexing (TDM) based on the synthetic aperture imaging algorithm, and 3) impulse-radio pulse width modulation (IR-PWM) for a wireless data acquisition.
Sponsor
Date Issued
2017-04-07
Extent
Resource Type
Text
Resource Subtype
Dissertation