ECG Chart Digitization via Grid Detection and Waveform Extraction

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

There is a need for an efficient method to convert paper ECGs into digital ECGs, driven by the healthcare industry's shift towards digital technologies and impending regulatory guidelines, which require a standardized digital format for ECG records.

Innovation Solution

A method involving scanning ECG charts, detecting the grid, and digitizing the waveform using active contours and dynamic programming to create a digital representation of the ECG, allowing for the conversion of paper ECGs to digital ECGs, which can be stored and analyzed digitally.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If paper ECG charts are converted to digital format using scanning and manual digitization methods, then digital ECG files can be created for storage and analysis, but the conversion process is time-consuming and labor-intensive

Engineering Contradiction:

Improveconversion speedVSAvoiddigitization time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent replaces manual mechanical digitization processes with an automated computer-based system that uses image processing algorithms to detect grid lines and extract waveform data, thereby eliminating the need for manual tracing and significantly reducing conversion time

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system performs self-service by automatically detecting grid patterns, scaling axes, and extracting ECG waveforms without requiring manual intervention, enabling the conversion process to be completed autonomously by the software

Inventive Principle:

Principle #25Self-service

2Adaptability or versatility

If standardized digital ECG formats are implemented across the healthcare industry, then data exchange and analysis efficiency are improved, but the cost of converting existing paper records to digital format increases

Engineering Contradiction:

Improvedigital format compatibilityVSAvoidconversion resources

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent creates a universal digital ECG format that can be used across different healthcare systems and applications, enabling standardized data exchange while the automated conversion process efficiently handles the transformation of existing paper records with minimal resource requirements

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If automated algorithms are used to detect grid lines and scale axes in scanned ECG images, then conversion accuracy is improved, but the complexity of the processing system increases

Engineering Contradiction:

Improvewaveform digitization accuracyVSAvoidimage processing complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the image processing task into distinct stages: grid line detection, axis scaling, and waveform extraction. Each stage uses specialized algorithms that work independently, improving overall accuracy while managing system complexity through modular processing

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS7424137B2Method and system for converting paper ECG printouts to digital ECG files

Publication Date: 2008.09.09 AMPS

AI summary

A method for digitizing a two-dimensional ECG chart includes scanning the ECG chart. The ECG chart includes an ECG waveform that appears on a background grid having generally horizontal and generally vertical grid lines. The background grid is detected, and the number of pixels between grid lines is determined. The vertical axis of the scanned ECG chart is scaled in units of volts per pixel and the horizontal axis of the scanned ECG chart is scaled in units of time per pixel.