SPECT Camera Photon Detection Using Probabilistic Reconstruction
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Solution Overview
Problem
Traditional SPECT cameras utilize collimation to detect photons, resulting in the blocking of 99.9% to 99.99% of incoming photons, leading to inefficient image creation due to the use of only a tiny percentage of available photons.
Innovation Solution
A SPECT camera with a selectively positionable photon detector and a computerized image processor that admits uncollimated photons and uses a probabilistic imaging algorithm to create images, allowing a greater percentage of photons to contribute to the image by accounting for the uncertainty in their trajectories.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If collimation is used to detect photons, then measurement precision is improved, but productivity deteriorates due to blocking 99.9% to 99.99% of incoming photons
Solution Approach 1:
The invention removes the collimator component entirely from the SPECT camera system. By eliminating this physical constraint, the system can detect photons without blocking 99.9% to 99.99% of incoming photons, thereby resolving the contradiction between measurement precision and productivity.
Solution Approach 2:
The invention replaces the mechanical collimation system with a computational approach. Instead of using physical structures to define photon trajectories, the system uses probabilistic algorithms and image reconstruction techniques to achieve the same measurement precision without the productivity penalty of blocking photons.
2Measurement precision
If collimation is used to detect photons, then measurement precision is improved, but loss of substance worsens due to elimination of most photons
Solution Approach 1:
The invention removes the collimator that causes photon elimination. By extracting this component from the system, photons are no longer blocked or eliminated, thus reducing loss of substance while maintaining measurement precision through alternative computational methods.
Solution Approach 2:
The invention converts the previously harmful effect of uncollimated photons (which caused trajectory uncertainty) into a beneficial situation. By accepting all photons and using probabilistic reconstruction algorithms, the system transforms the challenge of photon direction uncertainty into an opportunity to utilize every detected photon for image creation.
3Productivity
If uncollimated photons are admitted, then productivity is improved by increasing photon detection, but measurement precision deteriorates due to trajectory uncertainty
Solution Approach 1:
The invention replaces mechanical collimation with computational trajectory determination. Probabilistic algorithms and image reconstruction techniques are used to infer photon trajectories from detection data, achieving measurement precision without requiring physical collimation that would reduce productivity.
Solution Approach 2:
The system uses iterative image reconstruction algorithms that incorporate feedback from detected photon data to progressively refine trajectory estimates. This feedback mechanism allows the system to achieve accurate trajectory information from uncollimated photons by continuously improving the reconstruction based on accumulated detection data.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly increases the number of photons used in image creation, potentially improving scan speed, spatial resolution, and contrast resolution while reducing radiation doses.
Implementation Method 1
a photon detector, including a detector surface, for (1) detecting photons from the body tissue incident on the detector surface
Data Source
AI summary
A photon detector for use in imaging, comprising a detector surface for detecting photons incident on the detector surface, the detector surface comprising at least one non-flat feature configured such that, during imaging, at least a portion of the photons are blocked from incidence upon at least a portion of the detector surface.