X-ray Diagnostic Apparatus CRFP Index for Image Quality
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Solution Overview
Problem
Current x-ray diagnostic apparatuses lack a comprehensive method to ensure image quality, particularly for clinically relevant objects like guide wires and stents, as existing measurement methods only address isolated technical issues and not the overall clinical relevance of the system.
Innovation Solution
A measuring device is introduced that calculates the Clinical Relevant Fluoroscopy Performance (CRFP) index by determining the reproduction quality of clinically relevant objects, calculating local noise variances, and taking the ratio of output values from the x-ray detector signals, incorporating a prediction stage, lookup table, subtraction stage, and Hough transformation to quantify image quality under standardized conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional measurement methods (DQE, resolution tests) are used, then isolated technical parameters are measured, but the overall clinical relevance of the system is not assessed
Solution Approach 1:
The patent applies universality by creating a comprehensive measurement system that evaluates multiple aspects of x-ray image quality simultaneously. The CRFP index integrates reproduction quality, noise variance, and contrast measurements into a single standardized metric that assesses both technical performance and clinical relevance, making the measurement system versatile for evaluating different x-ray equipment and clinically relevant objects together
2Adaptability or versatility
If different x-ray equipments and clinically relevant objects are compared, then standardized comparison is achieved, but the complexity of the measurement system increases
Solution Approach 1:
The patent applies merging by combining multiple measurement components into an integrated system. The first device for determining reproduction quality, the second device for calculating noise variance, and the ratio calculation device are merged into a unified measuring system that produces a single CRFP index value, enabling standardized comparison while managing complexity through integration
3Reliability
If the visibility of clinically relevant objects is improved, then image quality is enhanced, but the complexity of image processing increases
Solution Approach 1:
The patent applies preliminary action by performing background subtraction and noise variance calculation before final image evaluation. The system pre-processes the x-ray images by removing background components and calculating local noise characteristics in advance, which simplifies the subsequent visibility assessment of clinically relevant objects like guide wires and stents
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 enables standardized image quality certification for guide wires and stents, ensuring a minimum visibility quality and allowing comparison of different x-ray equipment and clinically relevant objects, thereby improving the visibility and detectability of these objects in x-ray images.
Implementation Method 1
an x-ray radiator with an x-ray tube
Implementation Method 2
an x-ray detector
Data Source
AI summary
The invention relates to an angiographic x-ray diagnostic apparatus with an x-ray radiator having an x-ray tube, with a patient positioning table having a radiation-transparent positioning plate and mattress, with an x-ray detector, with an imaging system, an image processing unit and a measuring device to which the output signals of the x-ray detector are fed and which has a first device for determining a value determining the reproduction quality of clinically relevant objects, a second device for determining local variances of the noise in a homogenous image region of different x-ray images and a device for taking the ratio of the output values of the two devices.