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OtherRadionuclide Therapy (JNMT)

Analysis of residence time, effective half-life and internal dosimetry prior to radioiodine therapy

Caio Vinicius Oliveira, Tatiane Sabriela Camozzato, Patricia Fernanda Dorow and Jéssica Pasqueta
Journal of Nuclear Medicine Technology June 2022, jnmt.121.263502; DOI: https://doi.org/10.2967/jnmt.121.263502
Caio Vinicius Oliveira
Instituto Federal de Santa Catarina, Brazil
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Tatiane Sabriela Camozzato
Instituto Federal de Santa Catarina, Brazil
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Patricia Fernanda Dorow
Instituto Federal de Santa Catarina, Brazil
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Jéssica Pasqueta
Instituto Federal de Santa Catarina, Brazil
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Abstract

Radioiodine therapy has been widely used for ablation of remnant tissue after a surgical procedure for treatment of differentiated thyroid carcinoma (DTC). The use of internal dosimetry procedures provides a new approach in choosing the activity to be administered considering the distribution and retention of 131I individually per patient. This study aims to assess the accumulated activity, internal bone marrow dosimetry and effective half-life of cases undergoing treatment for DTC. This is a quantitative retrospective study with analysis of diagnostic documents and images. The internal dosimetry method used consists of calculating the dose absorbed by the bone marrow per administered activity of 131I. The calculation of the absorbed dose takes into account the accumulated activity obtained through measurements of whole-body images acquired at 4 intervals over a period of 5 days. Dosimetry presented the values of absorbed dose per administered activity, with a mean of 0.101 mGy/MBq (min.: 0.042 - max.: 0.151). The mean whole-body residence time is equal to 23.1 hours (min: 12.6 – max: 39.4). Effective half-life equal to 16.0 hours (min.: 7.6 and max.: 28.2). Internal dosimetry provides information relevant to safe dose limits for application to DTC radioiodine therapy, especially in advanced cases of the disease where the use of greater activities may be necessary.

  • Radiation Therapy Planning
  • Radiobiology/Dosimetry
  • Radionuclide Therapy
  • Dosimetry
  • Iodine radioisotopes
  • Nuclear medicine
  • Radiometry
  • Thyroid gland neoplasms

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Journal of Nuclear Medicine Technology: 50 (2)
Journal of Nuclear Medicine Technology
Vol. 50, Issue 2
June 1, 2022
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Analysis of residence time, effective half-life and internal dosimetry prior to radioiodine therapy
Caio Vinicius Oliveira, Tatiane Sabriela Camozzato, Patricia Fernanda Dorow, Jéssica Pasqueta
Journal of Nuclear Medicine Technology Jun 2022, jnmt.121.263502; DOI: 10.2967/jnmt.121.263502

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Analysis of residence time, effective half-life and internal dosimetry prior to radioiodine therapy
Caio Vinicius Oliveira, Tatiane Sabriela Camozzato, Patricia Fernanda Dorow, Jéssica Pasqueta
Journal of Nuclear Medicine Technology Jun 2022, jnmt.121.263502; DOI: 10.2967/jnmt.121.263502
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Keywords

  • Radiation Therapy Planning
  • Radiobiology/Dosimetry
  • Radionuclide Therapy
  • dosimetry
  • Iodine radioisotopes
  • nuclear medicine
  • Radiometry
  • Thyroid gland neoplasms
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