2019 Fiscal Year Research-status Report
Novel imaging technique using Compton cameras and polarized-entangled gamma photons
| Project/Area Number |
19K23436
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Caradonna Pietro 東京大学, カブリ数物連携宇宙研究機構, 特任研究員 (10846520)
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| Project Period (FY) |
2019-08-30 – 2021-03-31
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| Keywords | Compton PET / Entanglement |
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| Outline of Annual Research Achievements |
It has been shown that in PET, 75 to 80 percent of scattered coincidence are single scatters. The objective is to design a proof of concept experiment which will show that it is possible to obtain anatomical imaging using these single scatters if Compton cameras are used. The idea is based on using the cross-polarization entanglement of 511 keV photons, and the Compton cones generated by Compton cameras. There are 3 key stages which need to be accomplished in order to meet the objective. 1)Develop the Compton scattering theory of entangled 511 keV photons which can be used in simulations to find the scattering sites. (80 percent complete) 2)Develop the Geant4 simulation which can be used to write the algorithm for analysing the real data 3)Design the real-life experiment. The summary of my research achievements will now be summarized in point form for your convenience. 1)A Matrix Method of Compton scattering for entangled photons has been developed in order to determine the probability of certain scattering patterns which will yield anatomical information. The results of this work is contained in a paper titled (Probing entanglement in Compton interactions) published in Journal of Physics Communications, Oct. 2019, and a second paper currently under review by Journal of Physics Communications titled (Compton scattering of hard X-ray Bell state photons created by spontaneous parametric down-conversion) 2)Obtained preliminary equation for the triple Compton collision differential cross section for cross-polarization entangled photons.
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
Developing the theory that will provide analytical solutions has taken a little longer than expected which has caused some delay. We also found unexpected results which we felt important enough to submit it for publications. These results have to do with X-ray entangled photons. Writing this 2nd paper has proved to be very important to help in understanding the rules of applying the Matrix Theory for Compton PET technology.
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| Strategy for Future Research Activity |
1) I am now ready to focus on establishing the analytical solution for the triple Compton collision cross section, and publish the theoretical results. 2) In parallel to this, I am designing the geant4 simulation which simulates the passage of cross polarization entangled photons through matter. It has been shown that in PET, 75 to 80 percent of scattered coincidence are single scatters, with the exact percentage depending on the source and attenuator geometries. The simulation is based on finding these single scatters. 3) Write a program that can use these photons to find the location of the scattering sites and generate a 3D map which shows the locations of all these sites. 4) Use the simulation to determine the optimal experimental parameters to perform such an experiment and use the program to find the actual scattering sites.
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| Causes of Carryover |
The unused amount of 217,868 yen is set aside to pay for the cost of publication for a paper titled "Compton scattering of hard X-ray Bell state photons created by spontaneous parametric down-conversion". This paper was planned to be submitted before the end of the financial year FY2019. These unused funds are still planned for paying for the cost of publication for this paper which is still under review by the Journal of Physics Communications.
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Research Products
(2 results)
