SPECT Imaging Method for Stress Myocardial Perfusion Assessment
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Solution Overview
Problem
Current myocardial perfusion imaging (MPI) protocols are unreliable in assessing heart pumping ability under stress due to delays between stress induction and scanning, allowing hearts to recover before conditions are detected, and require excessive time and radiation exposure.
Innovation Solution
A SPECT diagnostic method that administers a rest radiotracer followed by a stressing agent, then a stress radiotracer, allowing for immediate scanning of heart pumping ability under stress conditions, reducing patient movement and radiation exposure while improving image alignment and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a delay of 30-45 minutes is introduced between stress induction and scanning to allow tracer distribution, then image quality improves, but heart pumping ability information becomes unreliable as the heart recovers from stress
Solution Approach 1:
The patent applies preliminary action by administering the radiotracer at rest before stress induction, allowing the tracer to distribute and fix in the myocardium while the heart is still under stress. This timing strategy captures both the stress state and adequate tracer distribution simultaneously, resolving the contradiction between image quality and physiological accuracy.
2Loss of information
If multiple separate scans are performed for rest perfusion, stress perfusion, and heart pumping ability, then comprehensive diagnostic information is obtained, but scan time increases from minutes to hours
Solution Approach 1:
The patent merges multiple diagnostic functions into a single integrated scan performed during stress. By combining rest perfusion imaging, stress perfusion imaging, and heart pumping ability assessment in one continuous scan session, the method obtains comprehensive diagnostic information while reducing total scan time from hours to minutes.
Solution Approach 2:
The imaging method achieves multi-functionality by using a single scan protocol that simultaneously provides rest perfusion information, stress perfusion information, and heart pumping ability assessment. This universal approach eliminates the need for separate specialized scans for each diagnostic parameter.
3Measurement precision
If multiple radiotracer administrations are performed for rest and stress scans, then diagnostic accuracy improves, but radiation exposure increases
Solution Approach 1:
The patent applies preliminary action by administering the radiotracer at rest before stress induction, allowing the tracer to distribute and fix in the myocardium while the heart is still under stress. This timing strategy captures both the stress state and adequate tracer distribution simultaneously, resolving the contradiction between image quality and physiological accuracy.
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 method provides more accurate assessment of heart pumping ability under stress, reduces scan time from hours to minutes, and minimizes radiation exposure, ensuring that heart conditions are accurately detected and treated.
Implementation Method 1
radiopharmaceuticals (otherwise known as radioactive tracers or radiotracers) are administered to patients
Implementation Method 2
involves directly measuring gamma rays emitted by radionuclides administered to a patient
Implementation Method 3
Single Photon Emission Computed Tomography (referred to in this specification as 'SPECT'), a branch of nuclear medicine, involves directly measuring gamma rays emitted by radionuclides
Data Source
AI summary
A SPECT diagnostic method of performing myocardial perfusion imaging on a patient, consisting of(A) administering a rest radiotracer to the patient while the patient is at rest; then(B) when the rest radiotracer is fixed in a heart of the patient, scanning the heart to obtain rest heart pumping ability information;(C) scanning the heart of the patient to obtain a rest perfusion image;(D) administering a stressing agent to the patient to place the patient's heart under stress;(E) scanning the heart of the patient to obtain stress heart pumping ability information; then(F) administering a stress radiotracer while the heart of the patient is under stress; then(G) when the stress radiotracer is fixed in the heart, scanning the heart to obtain a stress perfusion image.