Edge-on X-ray Detector Orientation Calibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing x-ray imaging systems, particularly CT systems, face challenges in accurately determining the orientation of edge-on x-ray detectors with respect to the direction of incoming x-rays, leading to issues such as lower detection efficiency, spatial resolution, and impaired image quality due to potential misalignment.
Innovation Solution
A method involving the use of a phantom with directional information embedded in the x-ray field, allowing measurements at multiple positions to determine the orientation of edge-on x-ray detectors, which enables calibration and correction of detector alignment and focal spot positioning through a geometrical model.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If edge-on detectors are used to improve detection efficiency, then detection efficiency is improved, but orientation alignment accuracy deteriorates due to mounting uncertainties
Solution Approach 1:
The patent performs preliminary orientation determination and calibration before actual imaging. A calibration phantom with known geometric features is imaged first to determine the actual orientation of detectors and focal spot position, which then informs corrections applied during subsequent imaging operations
Solution Approach 2:
The patent introduces a calibration phantom as an intermediary object with known geometric features (such as holes, edges, or patterns at specific positions). This phantom serves as a reference to indirectly determine detector orientation and focal spot positioning without requiring direct measurement of the detectors themselves
2Ease of operation
If detector orientation is not corrected to improve ease of operation, then ease of operation is maintained, but image quality deteriorates due to misalignment
Solution Approach 1:
The patent implements a feedback mechanism where measurement data from calibration phantoms is used to determine actual detector orientation and focal spot position, and this information feeds back into the imaging system to enable corrections. The system automatically adjusts or compensates for misalignments based on the determined parameters
Solution Approach 2:
Instead of requiring precise mechanical alignment and physical adjustment of detectors and focal spots, the patent replaces the mechanical alignment system with a computational approach. Software-based corrections are applied to account for misalignments, eliminating the need for precise mechanical positioning
3Measurement precision
If calibration procedures are implemented to improve orientation accuracy, then orientation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent uses a simplified calibration phantom that replicates or copies the essential geometric features needed for orientation determination. Rather than calibrating each detector individually, the system uses a single phantom with known features that provides reference information for the entire detector array
Solution Approach 2:
The calibration phantom serves multiple functions simultaneously: it provides reference for detector orientation, determines focal spot position, and validates the geometric model. This multi-functionality reduces the need for separate calibration procedures and objects, simplifying the overall calibration system
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 effectively improves detection efficiency, spatial resolution, and image quality by accurately determining the orientation of edge-on detectors and predicting the effects of movement, thereby enhancing the overall performance of x-ray imaging systems.
Implementation Method 1
an x-ray source and an x-ray detector array... The x-ray source emits x-rays, which pass through a subject or object to be imaged and are then registered by the detector array
Implementation Method 2
designed to embed directional information in the x-ray field when exposed to x-rays
Data Source
Figure 1
Figure 2
Figure 3
AI summary
There is provided a method for at least partly determining the orientation of an edge- on x-ray detector with respect to the direction of x-rays from an x-ray source. The method comprises obtaining (S1) information from measurements, performed by the x-ray detector, representing the intensity of the x-rays at a minimum of two different relative positions of a phantom in relation to the x-ray detector and the x-ray source, the phantom being situated between the x-ray source and the x-ray detector and designed to embed directional information in the x-ray field when exposed to x-rays. The method also comprises determining (S2) at least one parameter associated with the orientation of the x-ray detector with respect to the direction of x-rays based on the obtained information from measurements and a geometrical model of the spatial configuration of the x-ray detector, x-ray source and phantom.