Accelerated x-ray scatter projection imaging using multiple continuously moving pencil beams

Christopher Dydula; George Belev; Paul C. Johns

doi:10.1117/12.2253720

9 March 2017 Accelerated x-ray scatter projection imaging using multiple continuously moving pencil beams

Christopher Dydula, George Belev, Paul C. Johns

Proceedings Volume 10132, Medical Imaging 2017: Physics of Medical Imaging; 101324J (2017) https://doi.org/10.1117/12.2253720
Event: SPIE Medical Imaging, 2017, Orlando, Florida, United States

Abstract

Coherent x-ray scatter varies with angle and photon energy in a manner dependent on the chemical composition of the scattering material, even for amorphous materials. Therefore, images generated from scattered photons can have much higher contrast than conventional projection radiographs. We are developing a scatter projection imaging prototype at the BioMedical Imaging and Therapy (BMIT) facility of the Canadian Light Source (CLS) synchrotron in Saskatoon, Canada. The best images are obtained using step-and-shoot scanning with a single pencil beam and area detector to capture sequentially the scatter pattern for each primary beam location on the sample. Primary x-ray transmission is recorded simultaneously using photodiodes. The technological challenge is to acquire the scatter data in a reasonable time. Using multiple pencil beams producing partially-overlapping scatter patterns reduces acquisition time but increases complexity due to the need for a disentangling algorithm to extract the data. Continuous sample motion, rather than step-and-shoot, also reduces acquisition time at the expense of introducing motion blur. With a five-beam (33.2 keV, 3.5 mm2 beam area) continuous sample motion configuration, a rectangular array of 12 x 100 pixels with 1 mm sampling width has been acquired in 0.4 minutes (3000 pixels per minute). The acquisition speed is 38 times the speed for single beam step-and-shoot. A system model has been developed to calculate detected scatter patterns given the material composition of the object to be imaged. Our prototype development, image acquisition of a plastic phantom and modelling are described.

Citation Download Citation

Christopher Dydula, George Belev, and Paul C. Johns "Accelerated x-ray scatter projection imaging using multiple continuously moving pencil beams", Proc. SPIE 10132, Medical Imaging 2017: Physics of Medical Imaging, 101324J (9 March 2017); https://doi.org/10.1117/12.2253720

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