Volume 1 Supplement 1

Proceedings of the 3rd PSMR Conference on PET/MR and SPECT/MR

Open Access

Whole body MR-PET: a new internal dosimetry method for radiation transport calculation from biokinetic model data

  • Ana Nunes1,
  • Francisco Alves1, 2 and
  • Miguel Patrício3
EJNMMI Physics20141(Suppl 1):A78


Published: 29 July 2014

In order to ensure the safe usage of new radiopharmaceuticals in Positron Emission Tomography (PET), it is necessary to quantify the doses delivered to the organs and tissues within the patients’ bodies. A framework that allows estimating the dose delivered by PET has been established by the MIRD Committee [1, 2] and ICRP [3]. Although this covers the most important terms and concepts in Internal Radiation Dosimetry (IRD), it does not provide a detailed guide to assist in the development of a full dosimetric study. We discuss the development, implementation, assessment and validation of an accurate method for IRD studies of PET radiotracers.

We undertook a systematic review [4, 5] of previous PET dosimetry studies to identify the current biodistribution data acquisition and analysis methodologies. The methods reported were compared, particularly in terms of the collection of biokinetic data and the estimation of dose results. As a wide heterogeneity of approaches was found, it is important to assessthe impact of different choices in the internal dose calculation protocol. In particular, we quantify the variation in internal dose with different assumptions regarding organ activity uptake - namely, instantaneous uptake vs. different methods to extrapolate to zero activity at time zero. For that purpose, whole-body 11C-Raclopride PET data have been acquired and the corresponding internal doses estimated.

Authors’ Affiliations

Institute of Nuclear Sciences Applied to Health (ICNAS), University of Coimbra
College of Health Technology - Polytechnic Institute of Coimbra
Laboratory of Biostatistics and Medical Informatics, IBILI – Faculty of Medicine, University of Coimbra


  1. Siegel JA, Thomas SR, Stubbs JB, Stabin MG, Hays MT, Koral KF, Robertson JS, Howel RWl, Wessels BW, Fisher DR: MIRD pamphlet no. 16: techniques for quantitative radiopharmaceutical biodistribution data acquisition and analysis for use in human radiation dose estimates. J. Nucl. Med. 1999,40(2):37–61.Google Scholar
  2. Bolch WE, Eckerman KF, Sgouros G, Thomas SR: MIRD pamphlet no. 21: a generalized schema for radiopharmaceutical dosimetry—standardization of nomenclature. J. Nucl. Med. 2009, 50: 477–484. 10.2967/jnumed.108.056036PubMedView ArticleGoogle Scholar
  3. ICRP: The 2007 Recommendations of the International Commission on Radiological Protection. Ann. ICRP ICRP Publication 103; 2007,37(2.4):2. [http://www.icrp.org/docs/ICRP_Publication_103-Annals_of_the_ICRP_37(2–4)-Free_extract.pdf]
  4. Liberati A, Altman DG, Tetzlaff J, Mulrow C, Gøtzsche PC, Ioannidis JP, Clarke M, Devereaux PJ, Kleijnen J, Moher D: The PRISMA statement for reporting systematic reviews and meta-analyses of studies that evaluate health care interventions: explanation and elaboration. Ann. Intern. Med. 2009.,151(4): 10.1136/bmj.b2700Google Scholar
  5. Moher D, Liberat A, Tetzlaff J, Altman DG: Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement. Ann. Intern. Med. 2009, 151: 264–269. 10.7326/0003-4819-151-4-200908180-00135PubMedView ArticleGoogle Scholar


© Nunes et al; licensee Springer 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.