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Use of a Multi-compartment Dynamic Single Enzyme Phantom for Studies of Hyperpolarized Magnetic Resonance Agents

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A new cardiac phantom for dynamic SPECT.

A Krakovich¹, U Zaretsky², I Moalem³

¹Department of Biomedical Engineering, Tel-Aviv University, Tel Aviv, Israel. krakovich@mail.tau.ac.il.

Journal of Nuclear Cardiology : Official Publication of the American Society of Nuclear Cardiology

|January 31, 2020

Summary

A new beating cardiac phantom accurately mimics physiological radiotracer levels for validating myocardial blood flow (MBF) measurements in dynamic single photon emission computerized tomography (SPECT) systems. This innovation enhances the accuracy of SPECT imaging for cardiac diagnostics.

Keywords:

CFR MBF Nuclear medicine SPECT cardiac phantom dynamic phantom heart phantom

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Area of Science:

Medical Imaging
Nuclear Medicine
Cardiovascular Imaging

Background:

Dynamic single photon emission computerized tomography (SPECT) systems have advanced myocardial blood flow (MBF) measurement capabilities.
Existing mechanical phantoms lack features to simulate cardiac beating and physiological radiotracer variations.
This limits the validation of new SPECT system capabilities for cardiac imaging.

Purpose of the Study:

To develop and validate a novel dynamic cardiac phantom for emission tomography.
To mimic physiological radiotracer variations and cardiac beating in a phantom.
To validate myocardial blood flow (MBF) measurements from dynamic SPECT systems.

Main Methods:

Developed a mechanical cardiac phantom simulating left ventricle (LV) and myocardium (M) radiotracer variations with beating motion.
Created a mathematical model for phantom radiotracer concentrations and time-activity curves (TACs).
Utilized a net retention model to compute theoretical MBF for validating SPECT-reported values on a GE Discovery NM 530c system.

Main Results:

The developed phantom successfully mimics physiological radiotracer variations and beating-like motion.
Mathematical models enabled accurate replication of physiological-like time-activity curves (TACs).
SPECT-reported MBF values were validated against known phantom activity, assessing system accuracy.

Conclusions:

A novel dynamic cardiac phantom for emission tomography has been successfully developed.
The phantom can generate diverse TACs mimicking physiological and potentially pathological curves.
This phantom enables accurate validation of MBF measurements from dynamic SPECT systems like the GE Discovery 530c.