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Medical Physics / Volume 37 / Issue 9 / NUCLEAR MEDICINE PHYSICS

Med. Phys. 37, 4861 (2010); http://dx.doi.org/10.1118/1.3480965 (7 pages)

Radiation dose estimation using preclinical imaging with 124I-metaiodobenzylguanidine (MIBG) PET

Chang-Lae Lee1, Hilla Wahnishe2, George A. Sayre2, Hyo-Min Cho1, Hee-Joung Kim1, Miguel Hernandez-Pampaloni3, Randall A. Hawkins3, Shorouk F. Dannoon3, Henry F. VanBrocklin3, Melissa Itsara4, William A. Weiss5, Xiaodong Yang6, Daphne A. Haas-Kogan6, Katherine K. Matthay4, and Youngho Seo7

1Department of Radiology and Biomedical Imaging, UCSF Physics Research Laboratory, University of California, San Francisco, San Francisco, California 94143 and Department of Radiological Science and Research Institute of Health Science, Yonsei University, Wonju 220-710, Korea
2Department of Radiology and Biomedical Imaging, UCSF Physics Research Laboratory, University of California, San Francisco, San Francisco, California 94143
3Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, California 94143
4Department of Pediatrics, University of California, San Francisco, San Francisco, California 94143
5Department of Neurology, University of California, San Francisco, San Francisco, California 94143
6Department of Radiation Oncology, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, California 94143
7Department of Radiology and Biomedical Imaging, UCSF Physics Research Laboratory, University of California, San Francisco, San Francisco, California 94143; Department of Radiation Oncology, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, California 94143; and Joint Graduate Group in Bioengineering, University of California, San Francisco/Berkeley, San Francisco, California 94143

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(Received 4 May 2010; accepted 29 July 2010; revised 28 July 2010; published online 20 August 2010)

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Purpose: A pretherapy 124I-metaiodobenzylguanidine (MIBG) positron emission tomography (PET)/computed tomography (CT) provides a potential method to estimate radiation dose to normal organs, as well as tumors prior to 131I-MIBG treatment of neuroblastoma or pheochromocytoma. The aim of this work was to estimate human-equivalent internal radiation dose of 124I-MIBG using PET/CT data in a murine xenograft model.
Methods: Athymic mice subcutaneously implanted with NB1691 cells that express high levels of human norepinephrine transporter (n = 4) were imaged using small animal microPET/CT over 96 h (approximate imaging time points: 0.5, 2, 24, 52, and 96 h) after intravenous administration of 3.07–4.84 MBq of 124I-MIBG via tail vein. The tumors did not accumulate 124I-MIBG to a detectable level. All four animals were considered as control and organ radiation dosimetry was performed. Volumes of interest were drawn on the coregistered CT images for thyroid, heart, lung, liver, kidney, and bladder, and transferred to PET images to obtain pharmacokinetic data. Based on tabulated organ mass distributions for both mice and adult male human, preclinical pharmacokinetic data were extrapolated to their human-equivalent values. Radiation dose estimations for different age groups were performed using the OLINDA|EXM software with modified tissue weighting factors in the recent International Commission on Radiological Protection (ICRP) Publication 103.
Results: The mean effective dose from 124I-MIBG using weighting factors from ICRP 103 to the adult male was estimated at 0.25 mSv/MBq. In different age groups, effective doses using values from ICRP 103 were estimated as follows: Adult female: 0.34, 15-yr-old: 0.39 mSv/MBq, 10-yr-old: 0.58 mSv/MBq, 5-yr-old: 1.03 mSv/MBq, 1-yr-old: 1.92 mSv/MBq, and newborn: 3.75 mSv/MBq. For comparison, the reported effective dose equivalent of 124I-NaI for adult male (25% thyroid uptake, MIRD Dose Estimate Report No. 5) was 6.5 mSv/MBq.
Conclusions: The authors estimated human-equivalent internal radiation dose of 124I-MIBG using preclinical imaging data. As a reference, the effective dose estimation showed that 124I-MIBG would deliver less radiation dose than 124I-NaI, a radiotracer already being used in patients with thyroid cancer.

© 2010 American Association of Physicists in Medicine

ACKNOWLEDGMENTS

The authors acknowledge the following funding supports: National Cancer Institute Grant No. K25 CA114254 (G.A.S. and Y.S.), National Cancer Institute Grant No.R01 CA102321 (W.A.W.), Designated Grant from V Foundation (K.K.M., D.A.H., M.I., W.A.W., and Y.S.), and Dougherty Foundation and Alex Lemonade Foundation (K.K.M.).

Article Outline

  1. INTRODUCTION
  2. METHODS AND MATERIALS
    1. 124I -MIBG and Animal Models
    2. Small animal PET/CT
    3. Dosimetric calculations
  3. RESULTS
  4. DISCUSSION
  5. CONCLUSION
Digital Object Identifier
http://dx.doi.org/10.1118/1.3480965

KEYWORDS and PACS

Keywords

dosimetry, image registration, positron emission tomography, tumours, neuroblastoma, metaiodobenzylguanidine (MIBG), iodine-124, PET, dosimetry

PACS

PUBLICATION DATA

ISSN

0094-2405 (print)  

Publisher

$abstract.society.value is a Member of CrossRef American Association of Physicists in Medicine

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