CT Collimator Correction Coefficient Determination
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Solution Overview
Problem
Current CT systems face challenges in efficiently determining correction coefficients for image data modification based on collimation width, which affects imaging quality, as existing methods require scanning with the target collimation width, making the process time-consuming and inefficient.
Innovation Solution
A system and method that adjust the collimator's collimation width, determine correction coefficients using relationships between collimation widths and radiation intensities, and modify image data accordingly, allowing for efficient determination of target correction coefficients without scanning with the target collimation width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If correction coefficients are determined by scanning with the target collimation width, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The system performs preliminary scanning with a reference collimation width to obtain reference image data before actual scanning. Correction coefficients are calculated in advance based on this reference data, so that when actual scanning occurs, the pre-calculated coefficients can be directly applied or adjusted, avoiding the need to scan specifically for coefficient determination and thus reducing time loss.
Solution Approach 2:
The system uses reference image data obtained from scanning with a reference collimation width as a substitute or copy for what would be obtained with the target collimation width. By calculating correction coefficients based on this reference copy rather than requiring actual scanning with the target width, the system achieves acceptable precision without the time penalty of separate calibration scans.
2Adaptability or versatility
If the collimator's collimation width is adjusted to different values, then adaptability is improved, but device complexity increases
Solution Approach 1:
The system changes the collimation width parameter of the collimator to different predetermined values (reference collimation width and target collimation width) depending on the scanning requirements. By implementing a discrete set of adjustable collimation widths with corresponding pre-calculated correction coefficients, the system achieves adaptability for different imaging scenarios while managing device complexity through standardized parameter settings rather than continuous adjustment mechanisms.
Data Source
AI summary
The present disclosure relates to systems and methods for image data processing. A first correction coefficient corresponding to a first collimation width of a collimator of a scanner may be obtained. The collimator may have a collimation width being adjustable. A relationship between scattered radiation intensities and collimation widths may be obtained. A relationship between correction coefficients and collimation widths may be determined based on the first correction coefficient, the first collimation width, and the relationship between scattered radiation intensities and collimation widths. A target collimation width of the collimator may be obtained. A target correction coefficient may be determined based on the target collimation width and the relationship between correction coefficients and collimation widths.