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Research ArticleImaging

Comparison of Low-Energy and Medium-Energy Collimators for Thyroid Scintigraphy with 123I

Yuxin Li, Esther Choi, Artineh Hayrapetian, Emmanuel Appiah-Kubi, Jonathan Gershenson, Nazanin H. Asvadi and Gholam R. Berenji
Journal of Nuclear Medicine Technology March 2022, 50 (1) 25-29; DOI: https://doi.org/10.2967/jnmt.121.262517
Yuxin Li
1Department of Radiology, VA Greater Los Angeles Healthcare System, Los Angeles, California;
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Esther Choi
2Department of Radiology, Penn State Health, Milton S. Hershey Medical Center, Hershey, Pennsylvania;
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Artineh Hayrapetian
3UCLA Ahmanson Translational Theranostics Division, Los Angeles, California;
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Emmanuel Appiah-Kubi
4Department of Radiology, Ohio State University Wexner Medical Center, Columbus, Ohio; and
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Jonathan Gershenson
1Department of Radiology, VA Greater Los Angeles Healthcare System, Los Angeles, California;
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Nazanin H. Asvadi
5Department of Radiology, Saint Vincent Hospital, Worcester, Massachusetts
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Gholam R. Berenji
1Department of Radiology, VA Greater Los Angeles Healthcare System, Los Angeles, California;
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Abstract

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123I thyroid scintigraphy can be performed with either a low-energy or a medium-energy (ME) collimator. The high-energy photon emissions from 123I cause septal penetration with scattered photons, which deteriorate image quality. The aim of this study was to evaluate the impact of collimator choice on 123I thyroid scintigraphy in clinical practice. Methods: Forty-seven patients who underwent thyroid planar scintigraphy with both a low-energy, high-resolution (LEHR) collimator and a ME collimator were prospectively recruited using the same imaging protocol. Image quality, collimator sensitivity, and estimation of thyroid size were assessed between LEHR and ME collimators and were compared with thyroid ultrasonography as the gold standard. Results: Images acquired with the ME collimator demonstrated reduced scattered background noise, improved thyroid-to-background contrast, and increased sensitivity in the thyroid gland compared with images acquired by the LEHR collimator. Manual measurement of the thyroid length is more accurate using the ME collimator. Automatic estimation of the thyroid area using the same thyroid threshold is larger in ME collimator images than in LEHR collimator images. Conclusion: Compared with the LEHR collimator, the ME collimator generates cleaner 123I thyroid scintigraphy images with less background noise and has higher collimator sensitivity for thyroid imaging. Different thyroid thresholds should be used to estimate the thyroid area and volume between low and ME collimators.

  • endocrine
  • image processing
  • collimator
  • iodine-123
  • medium energy
  • thyroid scintigraphy

Footnotes

  • Published online September 28, 2021.

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Journal of Nuclear Medicine Technology: 50 (1)
Journal of Nuclear Medicine Technology
Vol. 50, Issue 1
March 1, 2022
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Comparison of Low-Energy and Medium-Energy Collimators for Thyroid Scintigraphy with 123I
Yuxin Li, Esther Choi, Artineh Hayrapetian, Emmanuel Appiah-Kubi, Jonathan Gershenson, Nazanin H. Asvadi, Gholam R. Berenji
Journal of Nuclear Medicine Technology Mar 2022, 50 (1) 25-29; DOI: 10.2967/jnmt.121.262517

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Comparison of Low-Energy and Medium-Energy Collimators for Thyroid Scintigraphy with 123I
Yuxin Li, Esther Choi, Artineh Hayrapetian, Emmanuel Appiah-Kubi, Jonathan Gershenson, Nazanin H. Asvadi, Gholam R. Berenji
Journal of Nuclear Medicine Technology Mar 2022, 50 (1) 25-29; DOI: 10.2967/jnmt.121.262517
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Keywords

  • endocrine
  • image processing
  • collimator
  • iodine-123
  • medium energy
  • thyroid scintigraphy
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