Collimator with Varying Column Heights for SPECT Imaging
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Solution Overview
Problem
Conventional radiation detection systems using variable collimators for SPECT imaging face challenges such as redundancy in acquired images, reduced image quality, and reconstruction artifacts due to repetitive information and complex system configurations.
Innovation Solution
A scan unit with a pixelated radiation detector and a collimator featuring a 2D array of columns with varying heights and septa, allowing for lateral displacement to produce unique scanning angles, reducing redundancy and improving image quality through non-forward looking tilted scanning angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple images are acquired using variable collimators with different collimations, then the sensitivity of the imaging system is improved, but significant redundancy of information is created reducing image quality
Solution Approach 1:
The collimator is made dynamically adjustable with multiple collimation settings that can be changed during the imaging process. This allows the system to adaptively select optimal collimation configurations for different imaging scenarios, enabling acquisition of diverse information while maintaining image quality by avoiding redundant measurements.
Solution Approach 2:
The system varies collimation parameters (aperture size, shape, and orientation) to acquire images with different information content. By strategically changing these parameters, the system optimizes the information-to-redundancy ratio, ensuring that each acquired image contributes unique data to the reconstruction process.
2Measurement precision
If the collimator height is changed to produce different viewing angles, then the sensitivity is improved, but the system complexity increases
Solution Approach 1:
The collimator is divided into multiple independent collimation elements that can be individually adjusted. This segmentation allows for simplified control mechanisms, as each element can be moved independently along a single axis without requiring complex multi-axis positioning systems, thereby reducing overall system complexity while maintaining sensitivity.
Solution Approach 2:
The variable collimator mechanism serves multiple functions: it adjusts viewing angles, optimizes sensitivity for different depths, and enables diverse collimation patterns. This multi-functionality consolidates what would otherwise require separate systems into a single device, reducing overall system complexity.
3Measurement precision
If the collimator is moved laterally relative to the radiation source, then unique scanning angles are produced improving image reconstruction, but the scanning time increases
Solution Approach 1:
The collimator performs rapid periodic lateral movements to acquire projections at multiple angles. This periodic scanning approach allows the system to efficiently collect the necessary data for image reconstruction by systematically cycling through required angular positions, optimizing the balance between coverage and time efficiency.
Solution Approach 2:
The system pre-plans and pre-position the collimator at optimal scanning angles before actual data acquisition begins. This preliminary positioning minimizes unnecessary movements during scanning, reducing total scanning time while ensuring that all required angular views are captured for high-quality reconstruction.
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 solution enables high-quality image reconstruction with reduced redundancy and artifacts, achieving high sensitivity and efficient data acquisition for SPECT imaging by varying collimation and scanning angles.
Implementation Method 1
a collimator positioned between the radiation detector and the radiation emitting object, with the collimator including a 2D array of columns having openings and septa forming bores, wherein the columns are arranged in groups along rows of the 2D array of columns and the bores within one of the groups have a different aspect ratio than the bores in another one of the groups
Implementation Method 2
an array of at least one pixelated radiation detector having an imaging surface including a two-dimensional (2D) array of pixels
Data Source
AI summary
Collimators for two-dimensional scans of a radiation sources and methods of scanning are provided. One system includes a scan unit for scanning and collecting ionizing radiation emitted from a radiation emitting object is provided. The scan unit includes an array of at least one pixelated radiation detector having an imaging surface including a two-dimensional (2D) array of pixels. The scan unit also includes a collimator positioned between the radiation detector and the radiation emitting object, with the collimator including a 2D array of columns having openings and septa forming bores, wherein the columns are arranged in groups along rows of the 2D array of columns and the bores within one of the groups have a different aspect ratios than the bores in another one of the groups.