Design and applications of cold-cathode X-ray imaging systems
Name
1251801720-MIT.pdf
Size
30.7 MB
Format
Adobe PDF
Checksum (MD5)
742b65d96542ee143641428c816b1a7b
Author(s)
Cramer, Avilash(Avilash Kalpathy)
Advisor(s)
Rajiv Gupta.
Date Issued
2021
Publisher
Massachusetts Institute of Technology
Abstract
X-ray computed tomography (CT) and planar x-ray imaging are mainstays of modern clinical care. The electron generation mechanism in standard x-ray tubes - specifically, a thermionic cathode - is reliable and capable of high current. However, thermionic cathodes are bulky, and cannot be pulsed quickly. Non-thermionic ('cold-cathode') electron generation can be exploited to make a smaller and rapidly pulsable x-ray source. Such an x-ray source could improve not just the portability of x-ray devices, but would allow for a CT system to operate by pulsing a distributed ring of x-ray sources instead of rotating a single large x-ray source. Furthermore, cold-cathode x-ray sources could allow for new signal acquisition and processing paradigms in the x-ray domain. This includes time-based image acquisition techniques, such as elastography and photon-counting measurements. In this dissertation, I discuss (1) the development of two novel types of cold-cathode x-ray sources: an ultraviolet photocathode-based source, and a silicon field emission chip; (2) novel methods for planar x-ray image acquisition, including a demonstration of dynamic x-ray elastography using a pulsed photocathode x-ray source; and (3) applications of modern signal processing techniques to the tomographic image reconstruction problem. In an epilogue, I discuss our research on N95 respirator sterilization and re-use for crisis situations.
Description
Thesis: Ph. D., Harvard-MIT Program in Health Sciences and Technology, September, February, 2021
Cataloged from the official PDF version of thesis.
Includes bibliographical references (pages 145-159).
Subjects
Harvard--MIT Program in Health Sciences and Technology.
MIT Department
Harvard University--MIT Division of Health Sciences and Technology
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