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Updated: Oct 11, 2025

Author Spotlight: Integrating Ultrasound Imaging with Biochemical Markers for Thyroid Disease Diagnosis
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Author Spotlight: Integrating Ultrasound Imaging with Biochemical Markers for Thyroid Disease Diagnosis

Published on: February 9, 2024

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Thyroid Uptake Exceeding 100%: Causes and Prevention.

Dhrumil Naik1, Sarah Ternan2, Renee Degagne2

  • 1University of Ottawa.

Journal of Nuclear Medicine Technology
|December 7, 2021
PubMed
Summary
This summary is machine-generated.

A novel quality control (QC) indicator for probe efficiency improves the accuracy of radionuclide thyroid uptake measurements, preventing errors like uptake exceeding 100%. This method enhances precision and mitigates operator and instrumentation issues in clinical settings.

Keywords:
NeuroendocrineQuality AssuranceQuality controlRadionuclideRadionuclide TherapyThyroid uptake

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Area of Science:

  • Nuclear Medicine
  • Medical Physics
  • Radiopharmacy

Background:

  • Radionuclide thyroid uptake measurements assess thyroid gland metabolic activity.
  • Uptake is calculated as a percentage of retained radioactivity versus administered dose, theoretically ranging from 0% to 100%.
  • Errors can lead to uptake measurements exceeding 100%, necessitating improved quality control.

Purpose of the Study:

  • To review sources of error in radionuclide thyroid uptake measurements.
  • To introduce and evaluate a novel quality control (QC) indicator for probe efficiency.
  • To enhance the accuracy and reliability of clinical thyroid uptake measurements.

Main Methods:

  • Probe efficiency was determined by comparing probe dose counts to independent dose calibrator readings.
  • Nominal probe efficiency (M) and standard deviation (SD) were calculated from multiple readings (n≥20).
  • Warning (M±1.96×SD) and error (M±2.58×SD) levels were established for routine clinical QC.

Main Results:

  • A statistically significant difference in nominal efficiency was observed between old and replacement devices (P=0.01).
  • When technologists were aware of QC, variability was significantly lower (P<0.001) compared to when they were not.
  • The novel QC indicator demonstrated significantly lower variability (P<0.001) when applied.

Conclusions:

  • Incorporating probe efficiency as a QC indicator is a simple method to improve thyroid uptake measurement precision.
  • This QC approach effectively mitigates errors arising from both operators and instrumentation.
  • The study highlights the importance of robust QC for accurate radionuclide uptake diagnostics.