Cardiac CT Aortic Valve Stenosis Severity Assessment

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Solution Overview

Problem

Current methods for assessing aortic valve stenosis severity, such as echocardiography, face limitations due to dependence on acoustic windows and potential measurement errors, particularly in patients with poor acoustic windows or those who have undergone prosthetic valve implantation, where Doppler-derived velocity measurements can be challenging to obtain.

Innovation Solution

The method involves performing cardiac computed tomography (CT) scans to determine the aortic valve area (AVACT) and left ventricular outflow tract area (LVOT AreaCT), calculating an anatomic dimensionless index (DICT), and using these measurements to assess the severity of aortic valve stenosis, with severity levels determined based on specific thresholds for AVACT and DICT values, and computing the mean aortic valve gradient using a provided equation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If echocardiography is used to assess aortic valve stenosis, then the assessment can be performed non-invasively, but measurement accuracy deteriorates in patients with poor acoustic windows or those who have undergone prosthetic valve implantation

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidacoustic window limitations

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the acoustic-based echocardiography system with a CT imaging system. Instead of using ultrasound waves to visualize the aortic valve and measure stenosis severity, the system uses CT scans to obtain anatomical measurements of the aortic valve area (AVACT) and left ventricular outflow tract area (LVOT AreaCT), thereby eliminating the limitations of acoustic windows and Doppler-derived velocity measurements in patients with poor acoustic windows or prosthetic valves

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an intermediary calculation approach by computing an anatomic dimensionless index (DICT) based on CT-derived area measurements. This intermediary index serves as a bridge between the CT anatomical measurements and the hemodynamic assessment, allowing accurate stenosis evaluation without direct reliance on acoustic windows or Doppler velocity measurements

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If Doppler-derived velocity measurements are used to assess aortic valve stenosis, then the assessment can be performed quickly, but measurement precision deteriorates in patients with poor acoustic windows

Engineering Contradiction:

Improvestenosis severity assessmentVSAvoidDoppler velocity measurement

Core Design Contradiction:

Measurement precisionVSDifficulty of detecting and measuring

Solution Approach 1:

The patent substitutes the Doppler velocity measurement approach with a direct anatomical measurement approach using CT imaging. Instead of measuring blood flow velocity through Doppler ultrasound, the system measures the anatomical areas of the aortic valve and left ventricular outflow tract from CT scans, thereby eliminating the measurement difficulties associated with Doppler velocity acquisition in patients with poor acoustic windows

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If CT scanning is used to assess aortic valve stenosis, then measurement accuracy improves in patients with poor acoustic windows, but the imaging technique complexity increases

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidimaging technique

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent leverages the multi-functionality of CT imaging, which is already widely used in cardiac anatomy assessment, to also evaluate hemodynamic parameters of aortic valve stenosis. By using the same CT scanner and image processing capabilities that are already standard in cardiac imaging, the system avoids introducing entirely new complex technology while expanding the diagnostic capability to include stenosis severity assessment with improved accuracy

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 approach provides a comprehensive and accurate assessment of aortic valve stenosis severity, complementing echocardiography by overcoming limitations related to acoustic windows and measurement errors, and effectively evaluating patients with poor acoustic windows or prosthetic valves, while offering consistent and accurate data for aortic valve area and gradients.

Implementation Method 1

a CT scanner configured to perform a cardiac CT scan of a patient. The CT scanner may comprise a gantry comprising one or more X-ray generators

Methodology Applied

Scientific EffectX-ray: X-Ray

Data Source

PatentUS20250099059A1Hemodynamic assessment of aortic valve stenosis by cardiac computed tomography

Publication Date: 2025.03.27 VALLEY HEALTH SYST

AI summary

Systems and methods for performing hemodynamic assessments of aortic valve stenosis by cardiac computed tomography (CT) scanning are provided. The method may comprise performing a cardiac CT scan of a patient and, using a computing device, determining, via the CT scan, an aortic valve area (AVACT) of the patient and a left ventricular outflow tract area (LVOT AreaCT) of the patient, calculating an anatomic dimensionless index (DICT) based on the aortic valve area (AVACT) and the left ventricular outflow tract area (LVOT AreaCT), and determining, based on the aortic valve area (AVACT), the left ventricular outflow tract area (LVOT AreaCT), and the anatomic dimensionless index (DICT), a severity level of aortic valve stenosis (AS) of the patient.