PCCT Detector Calibration Using Staged Tube Current Scans
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Solution Overview
Problem
Existing photon counting computed tomography (PCCT) apparatuses face inefficiencies in acquiring calibration data due to the need for manual phantom disposition, leading to suboptimal error correction in output data.
Innovation Solution
A method involving controlled variation of tube current values in multiple stages to generate calibration data for correcting nonlinear errors in radiation detectors, both with and without a subject present, using first and second calibration data to efficiently correct errors in output data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration data is acquired by performing scanning with a phantom disposed manually, then error correction can be performed, but the acquisition process becomes time-consuming and inefficient
Solution Approach 1:
The system performs self-calibration by automatically acquiring calibration data through multiple scans with varying tube current values. The control unit orchestrates the scanning process and data collection without requiring manual phantom disposition, enabling the apparatus to calibrate itself efficiently while maintaining correction accuracy.
Solution Approach 2:
The system performs preliminary calibration scans with different tube current values before actual imaging. By pre-acquiring calibration data through multiple scans with varying currents, the system prepares correction information in advance, which is then applied during actual imaging operations to correct nonlinear errors.
2Measurement precision
If multiple tube current values are used in calibration scanning, then more accurate error correction can be achieved, but the number of scanning times increases
Solution Approach 1:
The system changes the tube current value parameter across multiple calibration scans to capture nonlinear detector response characteristics. By varying the tube current through different stages and using these varied data points to generate correction curves, the system achieves accurate nonlinear error correction while managing the number of required scans.
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 allows for efficient acquisition of calibration data, reducing the time required for error correction and improving the accuracy of tomographic images in PCCT systems.
Implementation Method 1
generate first calibration data for correcting a first error included in output data of the radiation detector in accordance with a nonlinear factor caused by the radiation detector... and generate second calibration data for correcting a second error included in output data of the radiation detector in accordance with a nonlinear factor caused by the radiation transmitted through the subject
Data Source
AI summary
An information processing apparatus generates first calibration data for correcting a first error included in output data of a radiation detector based on first output data output from the radiation detector by making a tube current value set in the radiation source different in a plurality of stages in a state in which a subject is not present between the radiation source and the radiation detector, and generates second calibration data for correcting a second error included in output data of the radiation detector, based on second output data output from the radiation detector in accordance with a tube current value having a smaller number of stages than the plurality of stages in a state in which a phantom is present between the radiation source and the radiation detector.