X-ray CT Apparatus Dual-Dose Image Superimposition
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Solution Overview
Problem
X-ray computed tomography (CT) scans using low radiation doses result in images with significant noise and deteriorated quality, making diagnostic reading difficult and increasing dependency on operator skill, which can hinder the certainty and safety of CT fluoroscopy and monitoring scans.
Innovation Solution
An X-ray CT apparatus that switches between two radiation doses, using a higher dose for pre-scanning and a lower dose for monitoring, and superimposes a reference image from the higher dose scan onto the real-time image from the lower dose scan, adjusting the color and weight of the reference image based on the intensity distribution to enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a low radiation dose is used for monitoring scan, then the radiation dose to the subject is minimized, but the image quality deteriorates with significant noise making diagnostic reading difficult
Solution Approach 1:
A pre-scan is performed before the monitoring scan to acquire reference image data. This preliminary action allows the system to have high-quality reference images available before the low-dose monitoring scan, which can then be used to compensate for the poor quality of the low-dose images through image processing and combination techniques.
Solution Approach 2:
Reference image data from a pre-scan acts as an intermediary to improve the quality of low-dose monitoring images. The system combines the low-dose monitoring scan data with the reference image data through various processing methods (such as subtraction, combination, or overlay) to produce images that have both the low radiation dose benefit and improved diagnostic quality.
2Object-affected harmful factors
If a low radiation dose is used for monitoring scan, then the radiation dose to the subject is minimized, but diagnostic reliability decreases due to image noise and deterioration
Solution Approach 1:
The pre-scan is executed beforehand to establish reference image data that captures the subject's anatomy in detail. This preliminary high-quality data serves as a foundation for improving the reliability of subsequent low-dose monitoring images, allowing diagnostic readings to be performed with greater confidence despite the low dose conditions.
Solution Approach 2:
The system uses the reference image data to evaluate and enhance the monitoring scan images in real-time. By comparing the low-dose monitoring images against the reference images and applying corrective processing, the system provides feedback that improves image quality and ensures diagnostic reliability is maintained throughout the monitoring procedure.
3Object-affected harmful factors
If a low radiation dose is used for monitoring scan, then the radiation dose to the subject is minimized, but operator skill dependency increases making results less reproducible
Solution Approach 1:
The system performs automatic image processing and enhancement using the reference image data and monitoring scan data. Algorithms automatically adjust image parameters, combine images, and optimize display characteristics, reducing the need for manual intervention and operator skill. This makes the diagnostic process more reproducible and less dependent on individual operator expertise.
Solution Approach 2:
The reference image data serves as an intermediary that automatically compensates for variations in operator skill. By providing a standardized reference framework that all operators work from, the system reduces subjectivity and variability in image interpretation, making results more consistent and reproducible across different operators.
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
Improves the visibility and reproducibility of images obtained with low radiation doses, reducing human error and enhancing diagnostic reliability and safety by providing a clearer representation of the scanned area without relying solely on operator skill.
Implementation Method 1
an X-ray generator includes an X-ray tube, a high-voltage generator, an X-ray detector, The high-voltage generator generates a tube voltage to be applied to the X-ray tube. The X-ray detector detects X-rays irradiated from the X-ray tube and transmitted through a subject.
Data Source
AI summary
According to an embodiment, X-ray CT apparatus includes X-ray generator includes X-ray tube, high-voltage generator, detector, controller and circuitry. High-voltage generator generates tube voltage to be applied to X-ray tube. Detector detects X-rays irradiated from X-ray tube and transmitted through a subject. Controller controls high-voltage generator to scan the subject with first radiation dose and with second radiation dose lower than first radiation dose. Circuitry generates first image based on projection data acquired by scan at first radiation dose, generates second image based on projection data acquired by scan at second radiation dose, and displays first image and second image in common window.