Dynamic Pitch Factor Control for CT Image Quality
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current computed tomography systems face challenges in achieving high image quality and accurate reconstruction, particularly when using incomplete datasets or variable pitch factors, which can lead to artifacts and compromised image quality, especially in radiotherapy planning where precise organ segmentation is critical.
Innovation Solution
A method for operating an imaging X-ray device, such as a computed tomography system, where the pitch factor is dynamically adjusted based on the position and extension of the region to be mapped relative to the center of rotation, allowing for complete set of projection data acquisition and enabling high-quality three-dimensional reconstruction through filtered back projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed pitch factor is used in spiral CT scanning, then the scanning speed and productivity are improved, but the image quality and reconstruction accuracy deteriorate due to incomplete projection data and artifacts
Solution Approach 1:
The pitch factor is changed from a fixed value to a dynamically adjustable parameter that adapts to the specific examination requirements, patient anatomy, and reconstruction needs, allowing optimization of both scanning speed and image quality for each case
Solution Approach 2:
The system enables modification of the pitch factor parameter based on the region of interest, detector configuration, and clinical requirements, transforming it from a static system parameter to a flexible variable that can be optimized for each scanning scenario
2Loss of time
If the pitch factor is increased to reduce acquisition time, then the productivity is improved, but artifacts increase and image quality deteriorates
Solution Approach 1:
The pitch factor is adjusted as a controllable parameter to find the optimal balance between acquisition time and artifact reduction, allowing the system to adapt to different clinical priorities
Solution Approach 2:
The system dynamically adjusts the pitch factor based on real-time considerations of the scanning progress, remaining data requirements, and artifact suppression needs
3Manufacturing precision
If a lower pitch factor is used to improve image quality and reduce artifacts, then the manufacturing precision is improved, but the acquisition time increases reducing productivity
Solution Approach 1:
The pitch factor serves as an adjustable parameter that can be optimized for image quality when needed, or increased for faster scanning when time is the priority
Solution Approach 2:
The system can dynamically change the pitch factor during the scanning process or between different scanning phases to balance quality and speed requirements
4Adaptability or versatility
If the field of view is extended beyond the center of rotation, then the adaptability is improved, but the measurement precision deteriorates due to incomplete projection datasets
Solution Approach 1:
The pitch factor is dynamically adjusted based on the position of the region of interest relative to the center of rotation, allowing extended field of view while maintaining quality through localized optimization
Solution Approach 2:
The system modifies the pitch factor parameter according to the specific anatomical region being scanned and its distance from the rotation center, enabling adaptive optimization for different field of view requirements
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 ensures high image quality and accurate reconstruction by optimizing the pitch factor for the specific region of interest, reducing artifacts and enhancing the ability to segment high-risk organs accurately, while also allowing for longer acquisition times to maintain image quality.
Implementation Method 1
at least one X-ray source emits X-rays, which, after passing through a tunnel-shaped examination region, are acquired by at least one X-ray detector
Data Source
AI summary
A method for operating an imaging X-ray device, and the imaging X-ray device, are disclosed for acquisition of projection images. In an embodiment, X-rays are emitted from at least one X-ray source and, after passing through a tunnel-shaped examination region, acquired by at least one X-ray detector. At least the X-ray source is moved on a circular path or a circular arc section about a center of rotation in a plane of rotation. Herein, a patient couch is moved in a feed direction extending perpendicularly to the plane of rotation. According to at least one embodiment of the invention, a pitch factor is specified characterizing a feed of the patient couch in each unit of time as a function of an at least approximately ascertained position and/or extension of a region to be mapped in the plane of rotation with respect to the center of rotation.