|M.Sc Student||Gat Yonatan|
|Subject||Scattering Tomography using Multiplexed X-Ray Sources|
|Department||Department of Electrical and Computers Engineering||Supervisor||PROF. Yoav Schechner|
|Full Thesis text|
X-ray Computed Tomography (CT) was introduced in the 1970s. CT has saved
many lives over the years, giving the opportunity to diagnose life-threatening medical
emergencies in a short amount of time. However, the radiation used in CT is known to
be ionizing and may increase the risk of developing cancer. A CT scan can take up to
half an hour, depending on the scanned body part and the patient’s physical properties. This leads to queues to obtain a CT scan. Shortening the acquisition time can result in
more patients being treated and scanned every day.
Irradiating by multiple X-ray sources simultaneously has been studied to reduce the
total acquisition time, thus mitigating voluntary and involuntary movement artifacts.
We suggest a multiplexing scheme using a motionless CT machine. A motionless CT
can support arbitrary source multiplexing. The reconstruction we propose exploits
scattered photons. We present a multiplexing code that balances the trade-off between
the total acquisition time and the reconstruction quality. We analyze and compare
how the number of multiplexed sources affects the reconstruction quality, compared
to the acquisition time. Using a physics-based forward model, we create simulations
which demonstrate how the number of acquisitions can be reduced by up to 80% while improving the reconstruction quality compared to previous methods .