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Improving 90Y PET Scan Image Quality Through Optimized Reconstruction Algorithms.

Pei Ing Ngam1,2, Eelin Tan3, Gabriel Lim1

  • 1Department of Nuclear Medicine and Molecular Imaging, Singapore General Hospital, Singapore.

Journal of Nuclear Medicine Technology
|November 9, 2022
PubMed
Summary

Optimizing the Yttrium-90 (90Y) PET imaging reconstruction algorithm significantly improved image quality. The new LKYG algorithm enhanced diagnostic accuracy for liver cancer and neuroendocrine tumor treatments.

Keywords:
90Y PETPRRTSIRTimage qualityreconstruction algorithms

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Area of Science:

  • Nuclear Medicine
  • Radiochemistry
  • Medical Imaging

Background:

  • Yttrium-90 (90Y) is a radiometal used in targeted radionuclide therapies for liver cancers.
  • Accurate PET imaging is crucial for dosimetry and treatment monitoring in 90Y-based therapies.
  • Optimizing reconstruction algorithms can enhance the diagnostic quality of 90Y PET images.

Purpose of the Study:

  • To evaluate and compare the effectiveness of different reconstruction algorithms for improving 90Y PET imaging quality.
  • To determine the optimal reconstruction parameters for post-therapeutic 90Y PET/CT scans in patients with liver malignancies.

Main Methods:

  • Ten patients with liver metastases from neuroendocrine tumors or hepatocellular carcinoma underwent post-therapeutic 90Y PET/CT.
  • Three reconstruction algorithms were tested: Algorithm A (VUE Point HD, 6.4mm filter, 24 subsets, 2 iterations), Algorithm B (VUE Point FX, 6.0mm filter, 18 subsets, 3 iterations, TOF), and Algorithm C (VUE Point HD LKYG, 5mm filter, 32 subsets, 1 iteration).
  • Images were semiquantitatively scored by 10 nuclear medicine physicians using a 4-point scale.

Main Results:

  • Algorithm C (LKYG) achieved the highest median quality scores (4/4), significantly outperforming Algorithms A (3/4) and B (2/4) (P < 0.001).
  • 90Y PET scans reconstructed with Algorithm C were diagnostic in 91% of cases.
  • Statistical analysis confirmed significant differences in quality scores among algorithms for both peptide receptor radionuclide therapy and selective internal radiation therapy subgroups.

Conclusions:

  • The VUE Point HD (LKYG) algorithm, characterized by fewer iterations, a reduced filter cutoff, and more subsets, significantly enhances 90Y PET image quality.
  • This optimized algorithm improves diagnostic performance for 90Y-based therapies in liver cancer patients.
  • The findings support the adoption of the LKYG algorithm for improved 90Y PET imaging in clinical practice.