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Respiratory gating in [18F]fluorocholine PET/CT for hyperparathyroidism: a quantitative proof-of-concept study.

Mwinbele S Hien1,2,3, Hind Ait Talhiq1,4, Philippe Baltzinger5

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Respiratory gating significantly improves [18F]fluorocholine PET/CT imaging for hyperparathyroidism by reducing motion blur. This technique enhances quantitative PET parameters and visual assessment of parathyroid glands.

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Area of Science:

  • Nuclear Medicine
  • Radiopharmacology
  • Medical Imaging

Background:

  • The impact of respiration on [18F]fluorocholine parathyroid uptake remains unevaluated.
  • Hyperparathyroidism diagnosis relies on accurate parathyroid visualization.

Purpose of the Study:

  • To assess the feasibility of respiratory-gated [18F]fluorocholine PET/CT.
  • To evaluate the effect of respiratory motion correction on quantitative PET parameters.

Main Methods:

  • Respiratory-gated [18F]fluorocholine PET/CT utilized a thoracic pressure-sensitive belt.
  • Quantitative analysis included SUVmax, SUVpeak, and full-width-at-half-maximum (FWHM) of uptake.
  • Statistical comparison between gated and ungated scans was performed using Wilcoxon signed-rank and Mann-Whitney U tests.

Main Results:

  • Respiratory gating significantly increased SUVmax and SUVpeak compared to ungated scans (P<0.001).
  • Mean blurring extent was 13.7 mm axially, reduced significantly by gating (P<0.001).
  • Gating showed a more pronounced SUVmax increase in inferior parathyroid glands.

Conclusions:

  • Respiratory gating enhances [18F]fluorocholine PET/CT image quality by reducing blurring.
  • Improved imaging aids visual assessment of hyperfunctioning parathyroid glands.
  • Further studies are needed to confirm the clinical diagnostic impact, especially for indeterminate ungated scans.