3D Imaging via Annihilation Photon Tagging for Single-Sided Detection
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Solution Overview
Problem
Current imaging technologies using scattered photons lack accurate three-dimensional resolution due to limitations in radiation detector timing resolution and require access to both sides of the target, resulting in inferior image quality, contrast, and penetration.
Innovation Solution
The method employs electron-positron annihilation coincidence photons to 'tag' outgoing probe photons with direction and time, allowing for precise localization of scattering events using a return-scatter directional detector on a single side, thereby improving image quality and contrast by distinguishing single-scatter events and reconstructing three-dimensional images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time-of-flight information is used to localize scattering events, then three-dimensional imaging capability is achieved, but timing resolution limitations reduce measurement precision
Solution Approach 1:
The patent introduces an intermediary mechanism using annihilation coincidence photons to tag outgoing probe photons with precise direction and time information. This tagging system acts as a mediator that transfers temporal and spatial information from the source to the scattered photons, enabling accurate localization without being limited by detector timing resolution alone.
Solution Approach 2:
The patent adds temporal dimension to the imaging system by utilizing time-coincidence detection of annihilation photon pairs. By measuring the time difference between detection of the two annihilation photons, the system localizes scattering events along the line of response, effectively adding a time dimension that enables three-dimensional localization.
2Ease of operation
If single-sided imaging is implemented, then ease of operation is improved, but image quality and contrast deteriorate due to inability to detect scattered photons from all directions
Solution Approach 1:
The patent applies preliminary action by pre-tagging outgoing probe photons with direction and time information using annihilation coincidence photons before they interact with the target. This pre-marking enables the detector to identify and locate scattered photons even when detecting from a single side, as the tag information provides prior knowledge about the photon's origin and trajectory.
Solution Approach 2:
The system uses feedback from the detected annihilation coincidence photons to reconstruct the trajectories and localization of scattered photons. By continuously measuring and processing the coincidence events, the system refines its understanding of photon paths and scattering locations, improving image quality through iterative reconstruction based on detected signals.
Data Source
AI summary
Systems and methods are described herein for performing three-dimensional imaging using backscattered photons generated from a positron-electron annihilation. The systems and methods are implemented using the pair of photons created from a positron-electron annihilation. The trajectory and emission time of one of the photons is detected near the annihilation event. Using this collected data, the trajectory of the second photon can be determined. The second photon is used as a probe photon and is directed towards a target for imaging. The interaction of the second probe photon with the target produces back scattered photons that can be detected and used to create a three-dimensional image of the target. The systems and methods described herein are particularly advantageous because they permit imaging with a system from a single side of the target, as opposed to requiring imaging equipment on both sides of the target.