Pixelated Anode Detector DOI Determination
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Solution Overview
Problem
Conventional methods for determining the depth of interaction (DOI) in Nuclear Medicine imaging systems are complex and inaccurate due to the use of cathodes, which produce noisy signals and require additional hardware, reducing the accuracy and effectiveness of signal correction.
Innovation Solution
A radiation detector assembly with semiconductor detectors and pixelated anodes generates primary and secondary signals, allowing a processor to determine the DOI using the negative value of the secondary signal, eliminating the need for cathode signals and reducing hardware complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods use cathode signals to determine DOI, then DOI determination can be achieved, but the system complexity increases and signal accuracy decreases due to noisy cathode signals
Solution Approach 1:
The invention extracts and utilizes only the necessary signal information from the semiconductor detector - specifically the primary signal from the pixelated anode and the secondary signal from neighboring pixels. By eliminating the cathode signal requirement entirely, the system removes the source of noise and hardware complexity while retaining the essential DOI determination capability through charge sharing analysis between adjacent anodes.
Solution Approach 2:
The semiconductor detector performs self-service by using its own internal charge sharing characteristics to determine DOI. The primary signal and secondary signal are both generated within the same detector element, eliminating the need for separate cathode hardware. The detector essentially uses its own signal distribution pattern across adjacent pixels to self-determine the depth of interaction.
2Reliability
If cathode signals are used for DOI determination, then DOI can be measured, but signal noise increases reducing measurement effectiveness
Solution Approach 1:
The invention converts the charge sharing phenomenon, which was previously considered a source of signal loss or noise, into a useful measurement tool. By analyzing the secondary signal generated in neighboring pixels from charge sharing, the system determines DOI with high accuracy. The charge that would have been lost is now utilized to provide depth information through the ratio of primary to secondary signals.
3Measurement precision
If additional hardware is added to collect and process cathode signals, then DOI determination is enabled, but the overall system complexity increases
Solution Approach 1:
The pixelated anode structure serves multiple functions simultaneously: it collects the primary signal for energy measurement, generates secondary signals in neighboring pixels for DOI determination, and provides spatial localization information. This multi-functionality eliminates the need for separate cathode hardware, as the same anode structure performs all necessary measurement functions through its charge sharing characteristics.
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 improves the sensitivity and energy resolution of the detector system, leading to enhanced image quality by accurately determining the DOI without relying on cathode signals, thus simplifying the detection process.
Implementation Method 1
Each pixelated anode is configured to generate a primary signal responsive to reception of a photon by the pixelated anode
Implementation Method 2
generate at least one secondary signal responsive to an induced charge caused by reception of a photon by at least one surrounding anode
Data Source
AI summary
A radiation detector assembly is provided that includes a semiconductor detector, plural pixelated anodes, and at least one processor. The semiconductor detector has a surface. The plural pixelated anodes are configured to generate a primary signal responsive to reception of a photon by the pixelated anode and to generate at least one secondary signal responsive to an induced charge caused by reception of a photon by at least one surrounding anode. The at least one processor is configured to: acquire a primary signal from one of the anodes responsive to reception of a photon; acquire at least one secondary signal from at least one neighboring pixel of the one of the anodes, the at least one secondary signal defining a negative value; and determine an energy correction factor for the reception of the photon using the negative value of the at least one secondary signal.