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Simplified Quantification and Acquisition Protocol for 123I-MIBG Dynamic SPECT.

Jing Wu1, Jean-Dominique Gallezot1, Yihuan Lu1

  • 1Department of Radiology and Biomedical Imaging, Yale University, New Haven, Connecticut.

Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
|February 25, 2018
PubMed
Summary

A simplified method using Likelihood Estimation in Graphical Analysis (LEGA) allows for accurate absolute quantification of dynamic 123I-metaiodobenzylguanidine (123I-MIBG) SPECT imaging. This approach shortens scan times, enabling practical voxel-by-voxel parametric imaging for improved clinical applications.

Keywords:
123I-metaiodobenzylguanidine (123I-MIBG)dynamic SPECTparametric imagingsimplified quantification

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Area of Science:

  • Nuclear Medicine
  • Radiopharmaceutical Imaging
  • Quantitative SPECT

Background:

  • Previous studies confirmed the feasibility of absolute quantification for dynamic 123I-MIBG SPECT.
  • Accurate quantification is crucial for assessing neuroendocrine tumors and cardiac sympathetic innervation.
  • Existing methods often require lengthy acquisition times, limiting clinical practicality.

Purpose of the Study:

  • To report a simplified quantification method for dynamic 123I-MIBG SPECT.
  • To evaluate practical protocols with shortened acquisition times and voxel-by-voxel parametric imaging.
  • To compare a simplified Likelihood Estimation in Graphical Analysis (LEGA) model with a standard 2-tissue (2T) compartment model.

Main Methods:

  • Twelve healthy volunteers underwent dynamic 123I-MIBG SPECT scans with a full protocol (five 15-min scans).
  • Simplified protocols involved a 30-min initial scan plus a 15-min delayed scan.
  • Image-derived input functions were corrected for blood-to-plasma and metabolite effects; LEGA was used for voxel-by-voxel analysis.

Main Results:

  • LEGA demonstrated excellent agreement with the 2T compartment model for volume of distribution (VT) quantification (R2 = 0.997).
  • High-quality VT parametric images were successfully generated using LEGA.
  • Simplified protocols showed good correlation with the full protocol, especially with a longer interval between scans.

Conclusions:

  • LEGA provides a reliable and simplified approach for absolute quantification of dynamic 123I-MIBG SPECT.
  • A simplified protocol (30-min initial scan + 15-min scan ≥180 min post-injection) is effective for ROI-based modeling and parametric imaging.
  • This method enhances the clinical utility of 123I-MIBG SPECT by reducing acquisition time and enabling parametric imaging.