Gamma Ray Detector Light Sensor Summing Architecture

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Solution Overview

Problem

Gamma ray detectors in PET systems face challenges with high complexity and power requirements due to numerous small silicon photomultipliers, leading to increased capacitance, signal pulse stretching, and decreased timing performance.

Innovation Solution

Implementing a gamma ray detector with a scintillator block and light sensors having local and main summing points, where signals are uniformly transmitted, reducing overall capacitance and optimizing timing performance.

Engineering Contradictions & Design Principles

VSEngineering 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 is increased, but the device complexity and number of readout channels increase

Engineering Contradiction:
Improvedetection areaVSAvoiddevice complexity
Core Design Contradiction:
Area of stationary objectVSDevice complexity

Solution Approach 1:

Multiple small silicon photomultiplier signals are merged into a single readout channel through capacitive summing. The patent combines signals from multiple SiPMs by connecting their anodes to a common summing node, allowing large detection area coverage while reducing the number of readout channels from many individual channels to a single channel per detector element.

Inventive Principle:
Principle #5Merging (Combining)

2Device complexity

If larger sized silicon photomultipliers are used to reduce the number of channels, then the number of readout channels is reduced, but the total capacitance increases and signal pulses are stretched

Engineering Contradiction:
Improvenumber of readout channelsVSAvoidsignal pulse duration
Core Design Contradiction:
Device complexityVSDuration of action of moving object

Solution Approach 1:

The patent segments the total capacitance into multiple smaller capacitance contributions from individual silicon photomultipliers. By connecting multiple small SiPMs in parallel with their signals summed capacitively, the total capacitance is distributed across multiple small units rather than concentrated in one large SiPM, thereby reducing signal pulse stretching while maintaining large detection area.

Inventive Principle:
Principle #1Segmentation

3Device complexity

If larger sized silicon photomultipliers are used to reduce channel count, then the number of channels is reduced, but timing performance deteriorates due to increased capacitance and signal transit time spread

Engineering Contradiction:
Improvenumber of channelsVSAvoidtiming performance
Core Design Contradiction:
Device complexityVSMeasurement precision

Solution Approach 1:

The patent merges signals from multiple small silicon photomultipliers at a common summing node, combining the timing information from all detectors while maintaining the fast timing response of small SiPMs. This approach preserves timing performance by summing signals from small detectors rather than using a single large SiPM with inherently slower response.

Inventive Principle:
Principle #5Merging (Combining)

4Area of stationary object

If many small silicon photomultipliers are used to cover large area, then the detection area is increased, but power requirements increase

Engineering Contradiction:
Improvedetection areaVSAvoidpower requirements
Core Design Contradiction:
Area of stationary objectVSUse of energy by moving object

Solution Approach 1:

The patent merges multiple small silicon photomultiplier signals into a single readout channel, reducing the total number of active electronic channels required. This signal summation approach reduces power consumption by eliminating the need for separate low-noise high-bandwidth amplifiers for each individual SiPM, while still maintaining large detection area coverage.

Inventive Principle:
Principle #5Merging (Combining)

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 signal amplitude, reduces signal variation, and improves timing resolution in PET systems, leading to better image localization and signal-to-noise ratio.

Implementation Method 1

a scintillator block having a plurality of scintillator crystals and a plurality of light sensors coupled to the scintillator crystals

Methodology Applied
Scientific EffectScintillation: Scintillation

Data Source

PatentUS9182506B2Methods and systems for signal communication in gamma ray detectors
Publication Date: 2015.11.10 GE PRECISION HEALTHCARE LLC
  • US9182506B2 patent drawing
  • US9182506B2 patent drawing
  • US9182506B2 patent drawing

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 have a local summing point in each of a plurality of signal summing regions, wherein the local summing points are connected to the plurality of microcells. The plurality of light sensors also each include a main summing point connected to the plurality of local summing points, wherein the main summing point is located a same distance from each of the local summing points.