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Research ArticleBasic Science Investigation

Reducing Radiation Exposure from PET Patients

Shorouk F. Dannoon, Saud Alenezi, Naheel Alnafisi, Samar Almutairi, Fatma Dashti, Medhat M. Osman and Abdelhamid Elgazzar
Journal of Nuclear Medicine Technology September 2022, 50 (3) 263-268; DOI: https://doi.org/10.2967/jnmt.121.263223
Shorouk F. Dannoon
1Nuclear Medicine Department, Faculty of Medicine, Kuwait University, Jabryia, Kuwait;
2Nuclear Medicine Department, Mubarak Hospital, Ministry of Health, Jabryia, Kuwait;
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Saud Alenezi
1Nuclear Medicine Department, Faculty of Medicine, Kuwait University, Jabryia, Kuwait;
3Nuclear Medicine Department, Farwania Hospital, Ministry of Health, Farwania, Kuwait; and
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Naheel Alnafisi
1Nuclear Medicine Department, Faculty of Medicine, Kuwait University, Jabryia, Kuwait;
2Nuclear Medicine Department, Mubarak Hospital, Ministry of Health, Jabryia, Kuwait;
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Samar Almutairi
1Nuclear Medicine Department, Faculty of Medicine, Kuwait University, Jabryia, Kuwait;
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Fatma Dashti
3Nuclear Medicine Department, Farwania Hospital, Ministry of Health, Farwania, Kuwait; and
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Medhat M. Osman
4Department of Radiology, Division of Nuclear Medicine, St. Louis University, St. Louis, Missouri
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Abdelhamid Elgazzar
1Nuclear Medicine Department, Faculty of Medicine, Kuwait University, Jabryia, Kuwait;
2Nuclear Medicine Department, Mubarak Hospital, Ministry of Health, Jabryia, Kuwait;
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Abstract

This study measured the typical emitted radiation rate from the urinary bladder of PET patients after their scan and investigated simple methods for reducing the emitted radiation before discharge. Methods: The study included 83 patients (63 18F-FDG and 20 18F-NaF patients). Emitted radiation from the patients’ urinary bladder was measured with an ionization survey meter at a 1-m distance, presuming the urinary bladder to be the primary source of radiation. The measurements were taken at different time points after PET image acquisition: immediate (prevoid 1), voided (postvoid 1), after waiting 30 min in the uptake room while drinking 500 mL of water (prevoid 2), and voided again (postvoid 2). Results: For 18F-FDG patients, the reduction of emitted radiation due to drinking water and voiding alone from prevoid 1 to decay-corrected postvoid 2 was an average of 22.49% ± 7.48% (13.65 ± 3.42 μSv/h to 10.48 ± 2.37 μSv/h, P < 0.001). For 18F-NaF patients, the reduction was an average of 25.80% ± 10.03% (9.83 ± 2.01 μSv/h to 7.23 ± 1.49 μSv/h, P < 0.001). Conclusion: In addition to the physical decay of the radiotracers, using the biologic clearance properties resulted in a significant decrease of the emitted radiation in this study. Implementing additional water consumption to facilitate voiding with 30 min of wait time before discharging certain 18F-FDG and 18F-NaF patients who need to be in close contact with others, such as elderly, caregivers, and inpatients, might facilitate lowering their emitted radiation by an average of 22%–25% due to voiding, not counting in the physical decay that should add an additional 17% reduction.

  • PET/CT
  • public safety
  • radiation exposure
  • ALARA

Footnotes

  • Published online Apr. 19, 2022.

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Journal of Nuclear Medicine Technology: 50 (3)
Journal of Nuclear Medicine Technology
Vol. 50, Issue 3
September 1, 2022
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Reducing Radiation Exposure from PET Patients
Shorouk F. Dannoon, Saud Alenezi, Naheel Alnafisi, Samar Almutairi, Fatma Dashti, Medhat M. Osman, Abdelhamid Elgazzar
Journal of Nuclear Medicine Technology Sep 2022, 50 (3) 263-268; DOI: 10.2967/jnmt.121.263223

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Reducing Radiation Exposure from PET Patients
Shorouk F. Dannoon, Saud Alenezi, Naheel Alnafisi, Samar Almutairi, Fatma Dashti, Medhat M. Osman, Abdelhamid Elgazzar
Journal of Nuclear Medicine Technology Sep 2022, 50 (3) 263-268; DOI: 10.2967/jnmt.121.263223
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Keywords

  • PET/CT
  • public safety
  • radiation exposure
  • ALARA
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