CT Calibration Phantom with Correction Beads
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Solution Overview
Problem
Current computed tomography (CT) systems face geometric errors due to human error or mechanical changes, leading to deviations in image reconstruction, which existing correction methods either require pre-experiment parameter calculation or cannot calculate all geometric parameters synchronously.
Innovation Solution
A combined geometric calibration phantom and loading table device that allows for simultaneous image correction and photography, using a contrast carrier device with front and rear correction beads and a support body to fix the device to the CT system, enabling synchronous geometric parameter calculation and image reconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a specific phantom is used before tomography to check plane deviation, then geometric correction can be performed, but the correction plane may still deviate in long-term operation due to human factors or mechanical actions, and the process requires separate steps for correction and photography
Solution Approach 1:
The patent combines the geometric calibration phantom and loading table into a single integrated device. The phantom is mounted directly on the loading table, allowing both geometric correction and sample photography to be performed in one scanning process, eliminating the need for separate correction and imaging steps, thus saving time while maintaining correction precision
Solution Approach 2:
The integrated device serves multiple functions: it acts as both a geometric calibration phantom for correction and a loading table for sample photography. This multi-functional design allows the same device to perform both correction and imaging tasks, reducing the number of separate operations required
2Measurement precision
If pre-experiment parameter calculation is used for geometric correction, then geometric parameters can be determined, but the gantry may have geometry changes between two scans making the correction outdated
Solution Approach 1:
The patent performs geometric correction at the beginning of each scanning session using the integrated phantom, establishing accurate geometric parameters before actual sample imaging. This preliminary correction ensures that the geometric parameters are current and account for any gantry geometry changes that may have occurred
Solution Approach 2:
The integrated phantom provides continuous geometric reference information during scanning. By incorporating correction beads and reference structures that are scanned simultaneously with samples, the system can detect and compensate for geometric drift in real-time, ensuring correction validity throughout the scanning session
3Productivity
If synchronous geometric correction is performed by scanning the object once, then time is saved, but not all complete geometric parameters can be calculated
Solution Approach 1:
The calibration phantom is divided into multiple functional segments: correction beads for geometric parameter calculation, reference structures for orientation verification, and positioning features for alignment. Each segment contributes specific information needed for complete geometric parameter determination, allowing all parameters to be calculated from a single scan
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 solution enhances image quality by reducing geometric deviations and calculation errors, providing precise and time-efficient geometric correction for CT systems, improving the accuracy of 3D image reconstruction.
Implementation Method 1
The front outer peripheral surface is provided with a front correction bead; a loading table, wherein one end of the loading table is connected with the front ring body; a rear ring body, the rear ring body is oppositely arranged at the other end of the front ring body connected to the loading table, wherein the rear ring body has a rear outer peripheral surface, the rear outer peripheral surface is provided with a rear correction bead
Data Source
AI summary
The invention provides a contrast carrier device with geometric calibration phantom on computed tomography, comprising: a front ring body having a front outer peripheral surface; the front outer peripheral surface is provided with a front correction bead; a loading table, wherein one end of the loading table is connected with the front ring body; a rear ring body is oppositely arranged at the other end of the front ring body connected to the loading table, wherein the rear ring body has an outer peripheral surface, the rear peripheral surface is provided with a rear correction bead; a virtual axis passes through the center of the front ring body and the center of the rear ring body, respectively, and the front correction bead and the rear correction bead. The beads are arranged equidistantly along the virtual axis; and a support body is provided opposite to the other end of the rear ring body connected to the loading table, so that the contrast carrier device is fixed to a tomography scan, and the virtual axis coincide with a scan axis of the tomography device.