(Tuesday, 7/31/2018) 9:30 AM - 10:00 AM
Room: Exhibit Hall | Forum 8
Purpose: To detect and quantify intensity quantum interference patterns due to the wave nature of high energy 250 MeV proton in radiographic images.
Methods: Radiographic proton images were acquired for the leeds phantom using high energy proton beams from the MEVION-S250 proton therapy machine. The leeds phantom with Gafchromic films and computed tomographic plate were inserted between the slabs of 30cmx30cmx30cm solid-water phantom. Small and large open beams (14 and 25 cm diameter) with beam ranges from 5-35 cm and 2cm range modulation from the double-scattering proton therapy system were used in this study. The depth of the leeds phantom and distance from imager was varied from 1-15 cm separation. The radiographic images of the leeds phantom were acquired at different levels in the phantom that covered upstream, at the Bragg peak and downstream of the proton beam.
Results: Intensity wave interference patterns were detected and quantified in the radiographic images of high energy 250 MeV proton beams. The intensity from dose deposition from protons forms constructive and destructive interference patterns after passing through the leeds phantom where the features varied along the beam path depending on the position of the proton beam source, scattering phantom and the position of the imaging screen. The distance between the different constructive patterns depends on the z-values of the scattering material. A scattering wave model is developed to account for the different features that model the previous different parameters.
Conclusion: High energy protons behave as a wave that produces intensity interference patterns when they scatter on a high z-material in their path. These interference patterns provide valuable composition information about the proton beam quality, composition of the tissues or materials that they pass through, feasibility for quantum imaging with energetic proton beams that can be quantified with radiographic proton imaging.
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