X-ray Diagnostic Apparatus Contrast Profile Correction
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Solution Overview
Problem
Conventional brain perfusion analysis using X-ray CT apparatuses struggles to accurately compare preoperative and postoperative images, leading to potential misdiagnosis of infarctions and inappropriate thrombolytic therapy.
Innovation Solution
An X-ray diagnostic apparatus with processing circuitry that measures and corrects contrast media concentration profiles in regions of interest across two subtraction images, aligning them for accurate comparison by determining a correction factor for misregistration and contrast media effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional brain perfusion analysis is performed using X-ray CT apparatus, then blood perfusion images can be obtained, but accurate comparison between preoperative and postoperative images cannot be achieved due to misregistration and contrast media effects
Solution Approach 1:
The system changes parameters by determining correction factors that account for misregistration and contrast media effects. These correction factors are applied to adjust the subtraction images, enabling accurate comparison between preoperative and postoperative images by compensating for temporal and physiological variations
Solution Approach 2:
The patent replaces manual image comparison methods with automated processing circuitry that performs profile measurement, correction factor determination, and image correction. This substitution of mechanical/manual operations with automated computational methods improves both precision and reliability of the comparison process
2Device complexity
If subtraction images are created without correction, then image processing is simpler, but misdiagnosis of infarctions may occur
Solution Approach 1:
The system performs preliminary actions by measuring profiles and determining correction factors before creating the final comparison. This preliminary processing of the subtraction images ensures that corrections are applied in advance, preventing misdiagnosis while maintaining a systematic workflow that balances complexity with reliability
3Measurement precision
If profiles are measured and correction factors are determined, then accurate image comparison is enabled, but processing time and computational requirements increase
Solution Approach 1:
The system extracts only the essential information by measuring profiles in regions of interest and determining correction factors based on key characteristics. This extraction of critical data rather than processing entire images reduces computational burden and processing time while maintaining measurement precision for blood flow assessment
Data Source
AI summary
An X-ray diagnostic apparatus according to an embodiment includes processing circuitry. The processing circuitry is configured to measure respective profiles on contrast media concentration in regions of interest including blood vessels set at about the same position in two subtraction images of subject's head taken from about the same direction at different radiography times. The processing circuitry is configured to determine a correction factor so that the two profiles measured are approximately matched. The processing circuitry is configured to correct at least one of the two subtraction images on the basis of the correction factor determined. The processing circuitry is configured to control so as to display information based on the two subtraction images that at least one thereof has been corrected on a display.