Gamma Ray Detector Signal Path Inductance Reduction
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Solution Overview
Problem
Existing gamma ray detectors, particularly those using silicon photomultipliers, face complexity and inefficiency due to large numbers of small pixels, leading to increased channel count, cross-talk, and transit time spread, which complicates signal communication and reduces timing resolution in applications like Positron Emission Tomography (PET) systems.
Innovation Solution
The implementation of a gamma ray detector system with a scintillator block and light sensors featuring microcells, where signal traces are arranged to form a summing signal path with pin-outs, optimizing signal communication by reducing inductance and improving fill factors, allowing for better timing resolution and reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large number of small area silicon photomultipliers are used to cover a large detection area, then the detection area coverage is improved, but the device complexity and number of readout channels increases
Solution Approach 1:
Multiple small photomultiplier pixels are merged into a single monolithic device with integrated readout. The patent combines multiple photodetector elements into one unified structure with a shared anode, eliminating the need for separate readout channels for each pixel while maintaining large area coverage.
Solution Approach 2:
The monolithic device performs multiple functions: it detects gamma rays across a large area, sums signals from multiple pixels, and provides a single readout channel. The device integrates detection, signal summation, and readout functions into one universal component.
2Device complexity
If monolithic devices with larger areas are used to reduce the number of channels, then the number of readout channels is reduced, but cross-talk through inductive and capacitive electric coupling increases
Solution Approach 1:
The patent extracts and removes the problematic readout traces from the monolithic device structure. By eliminating the internal trace network that causes inductive and capacitive coupling, the design prevents cross-talk while maintaining the benefits of a monolithic architecture.
Solution Approach 2:
The patent introduces an intermediary approach by using a different device architecture that avoids direct electrical coupling between pixels through traces. The signal summation is achieved through a different mechanism that does not rely on traditional conductive traces, thereby eliminating the cross-talk pathway.
3Device complexity
If larger pixels are used in monolithic devices, then the number of pixels is reduced, but transit time spread increases due to size and signal summing point location
Solution Approach 1:
The patent extracts and eliminates the signal summing point from the internal device structure. By removing the traditional signal convergence point where traces meet, the design eliminates the variable path lengths that cause transit time spread.
Solution Approach 2:
The patent creates equipotential conditions for signal collection by using a design where all pixels have equal distance to the readout interface. This ensures that signals from different pixels arrive at the same time, eliminating transit time spread caused by varying path lengths.
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 configuration enhances timing optimization, lowers inductance, and increases fill factors, improving the signal-to-noise ratio and image quality in PET systems by reducing the number of channels and minimizing signal travel time, thereby localizing gamma ray sources more accurately.
Implementation Method 1
a scintillator block having a plurality of scintillator crystals
Implementation Method 2
a plurality of light sensors coupled to the scintillator crystals
Data Source
AI summary
Methods and systems for signal communication in gamma ray detectors are provided. One gamma ray detector includes a scintillator block having a plurality of scintillator crystals and a plurality of light sensors coupled to the scintillator crystals and having a plurality of microcells. Each of the plurality of light sensors has a first set of signal traces connected to the microcells and a second set of signal traces connected along the first set of signal traces and together forming a signal path to a summing signal trace. Each of the plurality of light sensors also has a pin-out connected to the summing signal trace.