Grouped Pinhole Collimator Layout for Sharper Gamma Camera Imaging
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Solution Overview
Problem
Existing gamma camera devices suffer from image blurring and inadequate angular information, particularly at higher photon energies, due to radiation penetration through the collimator material between pinholes and suboptimal pinhole arrangements.
Innovation Solution
The pinholes are arranged in separate groups in a plane perpendicular to the longitudinal axis, with each group having pinholes that form a continuous field of view covering a focus volume, allowing for a higher pinhole density and reduced penetration, while maintaining sufficient angular information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pinholes are arranged in cluster systems with central lines passing through the longitudinal axis, then angular information is obtained, but radiation penetration through collimator material between pinholes causes image blurring and reduced sharpness
Solution Approach 1:
The collimator is divided into multiple groups of pinholes, where each group contains pinholes with central lines that are parallel to each other and offset from the longitudinal axis by a distance between 0.5-2 cm. This segmentation allows each pinhole group to independently capture angular information while reducing radiation penetration through the collimator material between adjacent pinholes.
Solution Approach 2:
Each pinhole group is positioned with its central lines at a specific offset distance from the longitudinal axis, creating localized regions of improved image quality. The offset distance is optimized to balance angular information capture with reduced penetration effects, ensuring that each local region contributes to overall image sharpness while maintaining sufficient angular resolution.
2Measurement precision
If pinhole density is increased to improve resolution, then radiation sensitivity improves, but radiation penetration through collimator material increases causing more blurring
Solution Approach 1:
By segmenting the pinhole arrangement into multiple groups with offset central lines, the system achieves higher effective pinhole density without proportionally increasing radiation penetration. Each group contributes to resolution while the offset positioning minimizes overlapping penetration paths.
Solution Approach 2:
The solution moves from a single-axis symmetric pinhole arrangement to a multi-group arrangement with offset central lines in different positions. This dimensional change allows increased pinhole density while distributing penetration effects across different spatial locations, reducing overall blurring.
3Loss of information
If pinholes are positioned closer to the longitudinal axis, then angular information is improved, but the distance between adjacent pinhole systems must be larger reducing pinhole density
Solution Approach 1:
The collimator is segmented into multiple pinhole groups, each with central lines offset from the longitudinal axis. This segmentation allows pinholes to be positioned closer to the axis for better angular information while maintaining higher overall density through the distributed group structure.
Solution Approach 2:
Multiple pinhole groups with offset central lines are combined in a unified collimator structure. This merging allows the system to achieve both high pinhole density and sufficient angular information by combining the contributions of multiple groups positioned at different offsets from the longitudinal axis.
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 image sharpness and improves angular information collection, increasing radiation sensitivity and resolution by minimizing blurring and penetration effects.
Implementation Method 1
a detection device with at least one detector with a detector surface for detecting, as detector signals, gamma radiation emitted by the object and passing through pinholes of the collimator
Implementation Method 2
the collimator comprises a plurality of groups each of multiple pinholes each having a central line, wherein for each of said groups, the pinholes lie in a plane perpendicular to the longitudinal axis, wherein the pinholes of said groups together see a focus volume
Data Source
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AI summary
A gamma camera device comprises a collimator with pinholes which surrounds an object space for receiving an object, a detector surface for detecting gamma radiation emitted by the object and passing through pinholes of the collimator, and a controller for processing the detector signals into an image of the object. The collimator and the object space have a common longitudinal axis, wherein the collimator comprises a plurality of groups each of multiple pinholes with a central line. In each group, the pinholes lie in a plane perpendicular to the longitudinal axis, wherein the pinholes of the groups together see a focus volume, which focus volume has a geometric center. Within each group, on a rotation around said longitudinal axis, the respective central line of each of said pinholes becomes congruent with the central line of each of the other pinholes of the group.