Cardiac CT Post-Processing for Slab Boundary Artifact Correction

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Solution Overview

Problem

Current CT imaging systems face challenges with vessel mis-registration and greyscale de-banding between slabs, leading to artifacts that complicate the visualization and reporting of cardiac images, particularly affecting coronary vessel visualization.

Innovation Solution

A post-processing method that includes a dedicated filter to detect and quantify mis-registration at slab boundaries, applying compensation vectors to correct vessel mis-alignment and using adaptive greyscale de-banding techniques to minimize seam artifacts while preserving vessel integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of stationary object

If multiple heartbeats are used to acquire cardiac imaging data, then the axial length coverage is improved, but slab boundary artifacts and vessel mis-registration occur

Engineering Contradiction:
Improveaxial length coverageVSAvoidslab boundary artifacts
Core Design Contradiction:
Length of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The patent segments the cardiac imaging data acquisition into multiple heartbeats, where each heartbeat generates a separate slab of image data. This segmentation allows comprehensive axial coverage to be achieved by combining multiple slabs, while the invention subsequently addresses the slab boundary artifacts through detection and correction mechanisms that identify and compensate for mis-registration at the interfaces between segmented slabs.

Inventive Principle:
Principle #1Segmentation

2Length of stationary object

If slab boundary artifacts are present, then comprehensive cardiac coverage is achieved, but vessel visualization and reporting accuracy deteriorate

Engineering Contradiction:
Improvecardiac coverageVSAvoidvessel visualization accuracy
Core Design Contradiction:
Length of stationary objectVSMeasurement precision

Solution Approach 1:

The patent implements a feedback mechanism where the system detects slab boundary artifacts and vessel mis-registration in the reconstructed images, quantifies the extent of mis-alignment, and then applies corrective transformations. This closed-loop feedback process continuously refines the image quality by identifying artifacts and applying compensatory corrections to restore vessel visualization accuracy while preserving comprehensive cardiac coverage.

Inventive Principle:
Principle #23Feedback

3Measurement precision

If post-processing correction is applied, then vessel mis-registration is reduced, but processing complexity increases

Engineering Contradiction:
Improvevessel alignment accuracyVSAvoidprocessing complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent employs self-service principles where the post-processing system automatically detects slab boundary artifacts, quantifies mis-registration without requiring manual intervention, and applies appropriate corrective transformations. The system serves itself by autonomously identifying problems and implementing solutions, thereby reducing vessel mis-registration while managing processing complexity through automation rather than manual methods.

Inventive Principle:
Principle #25Self-service

Data Source

PatentUS10130325B2System and method of correcting banding artifacts in cardiac CT
Publication Date: 2018.11.20 GE PRECISION HEALTHCARE LLC
  • US10130325B2 patent drawing
  • US10130325B2 patent drawing
  • US10130325B2 patent drawing

AI summary

A CT system includes a gantry having a rotatable base and having an opening for receiving an object to be scanned, an x-ray source, a CT detector, and a computer programmed to detect a mis-registration at a slab boundary between a first slab and a second slab of a reconstructed image, quantify an amount of mis-registration at the slab boundary, and adjust the reconstructed image at the slab boundary based on the quantification.