X-ray Diagnostic Apparatus Parametric Imaging Secondary Peak Analysis
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Solution Overview
Problem
Conventional X-ray diagnostic apparatuses face limitations in rendering images based on parametric imaging, particularly in displaying color images corresponding to secondary peaks of lower signal intensity, which are crucial for observing blood flow in tissues and deeper structures like those in stroke or cerebral aneurysm cases.
Innovation Solution
The X-ray diagnostic apparatus includes a calculating module that extracts feature quantities from the temporal transition of contrast material signal intensity in X-ray images, allowing for the definition of specific sections within the time density curve to calculate parameter values for each pixel, enabling the generation of color images that reflect these values accurately, even for secondary peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional parametric imaging is used to calculate parameter values for each pixel, then blood flow information can be rendered, but secondary peaks of lower signal intensity cannot be accurately displayed
Solution Approach 1:
The time density curve is divided into multiple sections corresponding to different peaks (primary peak and secondary peak). The calculating module calculates parameter values separately for each section, enabling accurate rendering of both primary and secondary peak information that would otherwise be lost in conventional single-section processing.
Solution Approach 2:
The patent introduces a temporal section dimension to the parametric imaging process. By defining multiple time sections within the TDC and calculating parameters for each section separately, the system adds a dimensional layer that preserves information about multiple peak events, transforming single-value pixel rendering into multi-value rendering capability.
2Productivity
If only primary peaks are processed in conventional parametric imaging, then processing is simplified, but blood flow information in tissues and deeper structures is lost
Solution Approach 1:
The processing is segmented by time sections, with the calculating module handling different temporal intervals separately. This allows efficient processing of multiple peaks without requiring complete reprocessing of the entire TDC, maintaining productivity while capturing additional blood flow information from secondary peaks corresponding to tissue and deeper structure perfusion.
Solution Approach 2:
The system performs preliminary identification and extraction of peak sections from the TDC before calculating parameter values. This preliminary segmentation enables the system to process only the relevant temporal intervals for each peak, avoiding unnecessary computation on irrelevant periods and maintaining processing efficiency while capturing comprehensive blood flow information.
3Ease of manufacture
If conventional parametric imaging is used, then standard processing is maintained, but color image generation does not accurately reflect secondary peak characteristics
Solution Approach 1:
The color image generation is segmented by temporal sections, with distinct color mappings applied to different peak characteristics. The generator creates separate color representations for primary and secondary peak information, maintaining the simplicity of conventional processing while significantly improving rendering accuracy for multi-phase blood flow information.
Solution Approach 2:
Different color information is assigned to different temporal sections of the TDC based on their specific characteristics. The generator applies local quality differentiation by using distinct color mappings for primary peak regions versus secondary peak regions, enabling accurate visual representation of varying blood flow dynamics without complicating the overall processing architecture.
Data Source
AI summary
An X-ray diagnostic apparatus in embodiments includes a calculating module, a generator, and a changing module. The calculating module calculates feature quantity concerning a flow of a contrast material for each pixel in a predetermined section based on temporal transition in signal intensity of the contrast material in a predetermined section of a plurality of X-ray images radiographed with time by using the contrast material. The generator generates a first color image in which color information corresponding to the feature quantity concerning the flow of the contrast material in a first section as the predetermined section is reflected in each pixel. The changing module changes the predetermined section to a second section that is within the first section. the generator generates a second color image in which color information corresponding to the feature quantity concerning the flow of the contrast material in the second section is reflected in each pixel based on the color information corresponding to the second section out of the color information corresponding to the feature quantity concerning the flow of the contrast material in the first section and the feature quantity calculated in the second section.