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Single-scan rest∕stress imaging (18)F-labeled flow tracers.

Nathaniel Alpert1, Yu-Hua Dean Fang, Georges El Fakhri

  • 1Department of Radiology, Massachusetts General Hospital, Boston, MA 02114, USA.

Medical Physics
|November 7, 2012
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Summary

This study introduces a new method for measuring myocardial blood flow using a single scan, reducing scan time and improving accuracy. This approach accurately estimates rest and stress blood flow, even with long-lived tracers.

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Area of Science:

  • Nuclear medicine
  • Cardiovascular imaging
  • Pharmacology

Background:

  • Myocardial blood flow (MBF) assessment typically requires separate rest and stress scans due to residual radioactivity.
  • Long-lived tracers complicate rest-stress MBF measurements, necessitating complex protocols.

Purpose of the Study:

  • To develop a novel, single-session strategy for simultaneous rest and stress myocardial blood flow measurement.
  • To enable accurate MBF quantification using long-lived tracers in a shorter scan time.

Main Methods:

  • The study proposes a novel measurement strategy treating rest-stress scans as a single entity with changing flow parameters.
  • Two dual-injection kinetic models were developed to represent pharmacological stress as a transient increase in MBF.
  • The method was applied to (18)F-Flurpiridaz, a new myocardial flow-imaging agent.

Main Results:

  • Accurate and precise MBF estimation was achieved from a single-scan rest/stress study using (18)F-Flurpiridaz.
  • The proposed models demonstrated good accuracy and precision (within 5%) under various vasodilators and ischemic conditions.
  • Time-dependence of kinetic parameters was accounted for, ensuring reliable measurements.

Conclusions:

  • Simulations predict that accurate and precise rest-stress MBF measurements are feasible within a 20-30 minute scan session.
  • This novel method offers a more efficient approach to cardiovascular assessment using PET imaging.