Design and applications of cold-cathode X-ray imaging systems

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.

Name thesis:degree_name

Doctoral

Department dc:contributor.department

Harvard University--MIT Division of Health Sciences and Technology

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2021

Author dc:creator

• Cramer, Avilash(Avilash Kalpathy)

Advisor dc:contributor.advisor

• Rajiv Gupta.

• Harvard--MIT Program in Health Sciences and Technology.

Statement dc:rights

• MIT theses may be protected by copyright. Please reuse MIT thesis content according to the MIT Libraries Permissions Policy, which is available through the URL provided.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

https://hdl.handle.net/1721.1/130711

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/130711