Strengths and Weaknesses of a Planar Whole-Body Method of (153)Sm Dosimetry for Patients with Metastatic Osteosarcoma and Comparison with Three-Dimensional Dosimetry

Détails

ID Serval
serval:BIB_404A6953930C
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Strengths and Weaknesses of a Planar Whole-Body Method of (153)Sm Dosimetry for Patients with Metastatic Osteosarcoma and Comparison with Three-Dimensional Dosimetry
Périodique
Cancer Biotherapy and Radiopharmaceuticals
Auteur⸱e⸱s
Plyku D., Loeb D.M., Prideaux A.R., Baechler S., Wahl R.L., Sgouros G., Hobbs R.F.
ISSN
1557-8852 (Electronic)
ISSN-L
1084-9785
Statut éditorial
Publié
Date de publication
2015
Peer-reviewed
Oui
Volume
30
Numéro
9
Pages
369-379
Langue
anglais
Notes
Publication types: Clinical Trial, Phase I ; Comparative Study ; Journal Article ; Research Support, N.I.H., Extramural Publication Status: ppublish
Résumé
PURPOSE: Dosimetric accuracy depends directly upon the accuracy of the activity measurements in tumors and organs. The authors present the methods and results of a retrospective tumor dosimetry analysis in 14 patients with a total of 28 tumors treated with high activities of (153)Sm-ethylenediaminetetramethylenephosphonate ((153)Sm-EDTMP) for therapy of metastatic osteosarcoma using planar images and compare the results with three-dimensional dosimetry.
MATERIALS AND METHODS: Analysis of phantom data provided a complete set of parameters for dosimetric calculations, including buildup factor, attenuation coefficient, and camera dead-time compensation. The latter was obtained using a previously developed methodology that accounts for the relative motion of the camera and patient during whole-body (WB) imaging. Tumor activity values calculated from the anterior and posterior views of WB planar images of patients treated with (153)Sm-EDTMP for pediatric osteosarcoma were compared with the geometric mean value. The mean activities were integrated over time and tumor-absorbed doses were calculated using the software package OLINDA/EXM.
RESULTS: The authors found that it was necessary to employ the dead-time correction algorithm to prevent measured tumor activity half-lives from often exceeding the physical decay half-life of (153)Sm. Measured half-lives so long are unquestionably in error. Tumor-absorbed doses varied between 0.0022 and 0.27 cGy/MBq with an average of 0.065 cGy/MBq; however, a comparison with absorbed dose values derived from a three-dimensional analysis for the same tumors showed no correlation; moreover, the ratio of three-dimensional absorbed dose value to planar absorbed dose value was 2.19. From the anterior and posterior activity comparisons, the order of clinical uncertainty for activity and dose calculations from WB planar images, with the present methodology, is hypothesized to be about 70%.
CONCLUSION: The dosimetric results from clinical patient data indicate that absolute planar dosimetry is unreliable and dosimetry using three-dimensional imaging is preferable, particularly for tumors, except perhaps for the most sophisticated planar methods. The relative activity and patient kinetics derived from planar imaging show a greater level of reliability than the dosimetry.
Mots-clé
Bone Neoplasms/pathology, Bone Neoplasms/radionuclide imaging, Imaging, Three-Dimensional/methods, Organometallic Compounds/pharmacokinetics, Organophosphorus Compounds/pharmacokinetics, Osteosarcoma/radionuclide imaging, Osteosarcoma/secondary, Radiometry/methods, Radiopharmaceuticals/therapeutic use, Radiotherapy Planning, Computer-Assisted/methods, Whole Body Imaging/methods
Pubmed
Web of science
Création de la notice
11/10/2016 15:30
Dernière modification de la notice
20/08/2019 13:38
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