Sacral scintigraphy for bone marrow dosimetry in radioimmunotherapy.

International Journal of Radiation Applications and Instrumentation. Part B, Nuclear Medicine and Biology
J A SiegelD M Goldenberg

Abstract

Myelosuppression has been identified as the dose-limiting toxicity in radioimmunotherapy studies. Accurate bone marrow dosimetry is, therefore, necessary to evaluate bone marrow toxicity which may result from systemic cancer treatment with radiolabeled monoclonal antibodies. Dose to the red marrow was determined in 20 patient studies with 131I labeled anti-carcinoembryonic antigen, anti-alpha-feto-protein, or anti-human chorionic gonadotropin monoclonal antibody for diagnosis or treatment of diverse metastatic carcinomas, using a new technique involving sacral scintigraphy and a previously reported blood-based methodology. For the sacral technique, anterior and posterior gamma camera images of the pelvis were obtained at multiple times. Regions of interest were drawn around the sacrum in order to quantitate activity uptake as a function of time using the conjugate view counting method. Cumulated activity in red marrow was determined by curve integration and division by 0.099, since it has been estimated that 9.9% of the total red marrow is contained in the sacrum of the adult. Red marrow doses were then obtained by multiplying the cumulated activities by the appropriate S factor. These doses were compared to red marrow doses ob...Continue Reading

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Apr 23, 2010·European Journal of Nuclear Medicine and Molecular Imaging·Cecilia HindorfUNKNOWN EANM Dosimetry Committee
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