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Gamma camera-specific reference standards for radioactive iodine uptake measurements.

Jurgen E M Mourik1, Mark Derks2, Erik T Te Beek3

  • 1Department of Nuclear Medicine, Franciscus Gasthuis & Vlietland Hospital, Kleiweg 500, 3045 PM, Rotterdam, The Netherlands. J.Mourik@franciscus.nl.

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Summary

This study reveals significant technical variations in radioiodine uptake (RAIU) testing. Implementing camera-specific standards could standardize RAIU measurements and improve radioactive iodine therapy dosing.

Keywords:
Gamma cameraIsotope formulationRAIURadioiodine uptake testReference standardRegion-of-interest

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Area of Science:

  • Nuclear Medicine
  • Medical Imaging Technology

Background:

  • Current radioiodine uptake (RAIU) test guidelines permit variations in equipment, isotopes, activity, and region-of-interest (ROI) selection.
  • This study investigates the prevalence and impact of these variations in clinical practice.
  • It also explores the development and application of gamma camera-specific reference standards.

Purpose of the Study:

  • To assess the extent of technical variability in RAIU testing across Dutch nuclear medicine departments.
  • To evaluate the influence of specific variations (e.g., isotope formulation, ROI method) on RAIU outcomes.
  • To determine the feasibility and accuracy of using camera-specific reference standards for RAIU measurements.

Main Methods:

  • Questionnaires were distributed to nuclear medicine departments to gather data on RAIU testing protocols.
  • A neck phantom study was conducted to compare count measurements using different isotope formulations (capsule vs. water-dissolved) and ROI techniques (automatic vs. square box).
  • Clinical RAIU data from 2015-2018 were analyzed, and camera-specific reference standards were calculated and compared with original measurements.

Main Results:

  • Significant variations were found in isotope choice, formulation, activity, phantom use, reference measurement frequency, collimator distance, background measurement, and ROI delineation.
  • Water-dissolved isotope formulations yielded higher counts than capsules, and square box ROIs resulted in higher counts than automatic ROIs.
  • RAIU calculations using camera-specific reference standards were feasible and showed good correlation with original measurements.

Conclusions:

  • Considerable technical variation exists in clinical RAIU measurements, potentially affecting radioactive iodine therapy dose calculations.
  • Phantom studies confirm that formulation and ROI differences impact count measurements.
  • Camera-specific reference standards offer a promising method to reduce variability in RAIU testing, potentially replacing individual reference measurements.