CT Scanner Gantry Calibration Phantom Integration
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Solution Overview
Problem
Traditional CT scanners lack integrated calibration phantoms, leading to variability in bone mineral density (BMD) measurements due to phantom placement issues, affecting accuracy and workflow in musculoskeletal imaging.
Innovation Solution
Integration of calibration phantoms within the CT scanner gantry, ensuring they are always within the X-ray field of view, allowing for simultaneous imaging and calibration during patient scans, eliminating the need for additional devices and repositioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration phantoms are placed externally on the scanner bed or in separate calibration tables, then the scanner can perform quantitative imaging, but phantom placement variability degrades BMD accuracy and requires additional workflow steps
Solution Approach 1:
The calibration phantom is integrated directly into the gantry structure, merging the calibration function with the imaging system. This eliminates the need for separate calibration tables or external phantom placement on the scanner bed, thereby simplifying the workflow while maintaining measurement accuracy.
Solution Approach 2:
The calibration phantom is pre-positioned within the gantry at a fixed location before patient scanning begins. This preliminary positioning eliminates the need for manual phantom placement and localization during the scanning process, reducing workflow complexity and potential placement errors.
2Measurement precision
If calibration phantoms are positioned manually for each scan, then BMD calculations can be performed, but user interaction increases and affects accuracy
Solution Approach 1:
The calibration phantom is pre-positioned within the gantry at a fixed, known location before patient scanning begins. This preliminary positioning eliminates the need for manual phantom placement and localization during the scanning process, reducing workflow complexity and potential placement errors.
Solution Approach 2:
The system automatically locates and utilizes the calibration phantom for BMD calculations without requiring user interaction. The integrated phantom's fixed position within the gantry allows the system to automatically perform calibration, eliminating manual intervention and improving both accuracy and automation.
3Quantity of substance
If separate calibration scans are performed, then quantitative imaging data can be obtained, but total scan time increases
Solution Approach 1:
The calibration phantom is integrated into the gantry so that calibration data is acquired simultaneously with patient imaging during the same scan. This merging of calibration and imaging functions eliminates the need for separate calibration scans, thereby reducing total scan time while maintaining quantitative imaging capability.
Solution Approach 2:
The calibration phantom remains in place within the gantry throughout the scanning process, allowing continuous acquisition of both calibration and patient imaging data in a single uninterrupted scan. This eliminates idle time between separate calibration and imaging scans.
4Measurement precision
If additional calibration devices are introduced, then BMD measurements can be derived, but device complexity increases
Solution Approach 1:
The calibration phantom is integrated directly into the gantry structure, merging the calibration function with the existing imaging system. This eliminates the need for separate external calibration devices or add-on components, thereby reducing overall device complexity while maintaining densitometry capability.
Solution Approach 2:
The gantry structure serves multiple functions: it houses the X-ray source and detector for imaging, and simultaneously integrates the calibration phantom for BMD measurements. This multi-functionality eliminates the need for separate dedicated calibration devices, simplifying the overall system configuration.
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 enhances the accuracy of BMD measurements and improves clinical workflow by providing consistent calibration, reducing radiation exposure and scan time, while enabling precise quantitative imaging of bone and joint structures.
Implementation Method 1
An X-ray source is configured to emit X-rays that penetrate the patient or part of a patient. The detector receives the X-rays emitted from the X-ray source.
Data Source
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AI summary
An embodiment in accordance with the present invention provides a device and method for a quantitatively calibrated computed tomography scanner. The device includes a gantry configured for receiving a patient or part of a patient. The gantry includes an X-ray source and a detector positioned opposite said X-ray source, such that said detector receives the X-rays emitted from the X-ray source. Calibration phantoms are integrated with the gantry and/or a device within the scanner so as to allow for calibration in quantitative CT measurements of Hounsfield units and/or bone mineral density.