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Energy window optimization in bremsstrahlung imaging after Yttrium-90 microsphere therapy.

C Kayaş Demirtaş1, M Can1,2, Ö Karadeniz1,3

  • 1Department of Medical Physics, Institute of Health Sciences, Dokuz Eylül University, 35340, İnciraltı, İzmir, Turkey.

Biomedical Physics & Engineering Express
|February 2, 2024
PubMed
Summary

Optimizing the energy window for Yttrium-90 (Y-90) bremsstrahlung imaging significantly improves image quality. The 90-110 keV window provides the best results for Y-90 radioembolization therapy imaging.

Keywords:
%FOVYttrium-90 TAREbremsstrahlung imagingenergy window optimizationimage contrastspatial resolution

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Area of Science:

  • Nuclear Medicine
  • Medical Imaging
  • Radiotherapy

Background:

  • Yttrium-90 (Y-90) bremsstrahlung imaging is crucial for evaluating hepatic cancers.
  • Image quality in Y-90 imaging is highly dependent on the selected acquisition energy window.
  • Bremsstrahlung photons are produced across a wide energy spectrum during Y-90 decay.

Purpose of the Study:

  • To determine the optimal energy window for Yttrium-90 bremsstrahlung imaging.
  • To enhance diagnostic accuracy in patients undergoing Y-90 radioembolization therapy.
  • To improve image quality parameters such as field of view (FOV), contrast, and spatial resolution.

Main Methods:

  • Investigated 48 patients with various hepatic cancers treated with Y-90 radioembolization.
  • Utilized a GE Healthcare Optima NM/CT 640 series gamma camera with a medium energy general-purpose (MEGP) collimator.
  • Acquired planar images using 8 distinct energy windows ranging from 55-400 keV.
  • Statistically analyzed image quality parameters using ANOVA and Tukey tests.

Main Results:

  • The energy window of 90-110 keV was identified as optimal for Y-90 bremsstrahlung imaging.
  • Broader energy ranges, specifically 60-400 keV, resulted in the lowest image quality.
  • Statistical analysis confirmed significant differences in image quality across tested energy windows.

Conclusions:

  • The 90-110 keV energy window significantly enhances image quality for Yttrium-90 bremsstrahlung imaging.
  • Proper energy window selection is critical for accurate assessment in Y-90 radioembolization.
  • This optimization can lead to improved patient management and treatment efficacy.