SPECT Collimator Subsystem Thoracic Contour Matching
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Solution Overview
Problem
Conventional SPECT systems for cardiac imaging face inefficiencies due to sub-optimal detector coverage and collimation, leading to low photon sensitivity and variable image quality, particularly because they are not flexible enough to accommodate different patient sizes and shapes, and require cumbersome and time-consuming adjustments during imaging procedures.
Innovation Solution
An open arc-shaped SPECT system with a collimator and detector subsystem designed to match the thoracic contour of patients, featuring adjustable slit-plate and slit-guides for optimized collimation and detection, along with a patient positioning subsystem to accurately position the heart within a predetermined imaging volume, allowing for high geometric efficiency and reproducible image acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large circular frame design is used to accommodate large patient cross-section, then patient coverage is improved, but collimation efficiency deteriorates due to long-distance collimation offsets
Solution Approach 1:
The circular detector array is segmented into multiple independent detector modules arranged in a circular pattern. Each module can be independently positioned and oriented to optimize collimation distance for different patient sizes and anatomical regions, resolving the contradiction between covering large patients and maintaining collimation efficiency.
Solution Approach 2:
The system employs dynamically adjustable detector module positions and orientations that can be reconfigured during imaging procedures. This allows the collimation distance to be optimized for each specific patient anatomy, maintaining high collimation efficiency while accommodating varying patient cross-sections.
2Adaptability or versatility
If detector rotation is used to catch photons on the far side of the patient, then detection coverage is improved, but photons on the near side escape coverage and imaging time increases
Solution Approach 1:
The circular detector array is divided into multiple segments that can simultaneously detect photons from different angular positions. This segmentation allows near-side and far-side photons to be detected concurrently, eliminating the time loss associated with sequential rotation while maintaining comprehensive detection coverage.
Solution Approach 2:
The system transitions from sequential temporal detection (rotation over time) to parallel spatial detection by arranging detectors in a circular geometry. This dimensional change allows simultaneous detection from multiple angles, capturing both near-side and far-side photons at the same time rather than sequentially.
3Device complexity
If a fixed collimator design is used, then device simplicity is improved, but flexibility to accommodate different patient sizes and imaging requirements deteriorates
Solution Approach 1:
The collimator system is segmented into multiple adjustable components that can be independently positioned. This segmentation provides flexibility to optimize collimation parameters for different patient sizes while maintaining a relatively simple overall design based on modular elements.
Solution Approach 2:
The collimator design incorporates dynamic adjustment capabilities that allow real-time reconfiguration for different patient anatomies and imaging requirements. This dynamic adaptability is achieved through relatively simple mechanical adjustment mechanisms rather than complex fixed structures.
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
The system achieves improved sensitivity and image quality by optimizing detector coverage and collimation, accommodating various patient sizes and shapes, and simplifying the imaging process with reduced mechanical complexity and increased reproducibility.
Implementation Method 1
A source of penetrating radiation is administered to the patient, which typically consists of a pharmaceutical tagged with a radionuclide which emits radiation photons (radiopharmaceutical)
Implementation Method 2
The emitted radiation photons are collimated with a collimator subsystem
Implementation Method 3
detected by a detector subsystem which generates output electrical signals
Data Source
AI summary
A single photon emission computed tomography (SPECT) system for cardiac imaging including an open arc-shaped frame. A collimator subsystem is shaped to approximately match the thoracic contour to optimize the geometric efficiency for detecting photons emitted from the heart of patients having different sizes and weights and shaped to surround and position the collimator subsystem closely proximate a heart of a patient of the patients encompassed by at least one predetermined image volume for optimizing collimation of radiation photons emitted from the heart. The collimator subsystem is facilitated by a tracking system that is capable of quickly bringing up the collimator component, which meets a specific set of collimation requirements, into place for imaging. And an open arc-shaped detector system is coupled to the collimator subsystem having a shape closely matching the shape of the collimator subsystem for detecting collimated radiation photons from the collimator subsystem and generating output electrical signals.