Abstract
Two components relate to the topic of dosimetry in microsphere therapy. Dose (Gy) that is desired to be delivered to tumor tissue in the liver; and the activity (GBq) of yttrium-90 (90Y) delivered to the target organ. Classically, dosimetry is a Radiation Oncology term for the estimation of the absorbed dose expressed in units of Gy of radiation in tissue that will be or has been delivered. For microsphere treatment, it is more appropriate to describe an activity of radiation that will be implanted into the liver tumors, as there is not yet a proven way of preplan or post-plan confirmation of the absorbed dose in the target tissue. In other brachytherapy sites, seeds measuring several millimeters in size can be readily identified on CT scan or plain film and the resultant absorbed dose in the tissue calculated by hand or software solution. Microsphere implantation is a hybrid of interstitial brachytherapy and radioactive liquid therapy which at the present time is more accurately characterized by Nuclear Medicine conventions (Medical Internal Radiation Dose, MIRD) Committee of the Society of Nuclear Medicine [1] MIRD [2-5] and Partition Model [6, 7] than current or historical brachytherapy dose calculation methods (Patterson Parker, Point Source, and Volume Implant Rules).
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Kennedy, A.S., Dezarn, W.A., McNeillie, P. (2008). Posimetry and Dose Calculation. In: Bilbao, J.I., Reiser, M.F. (eds) Liver Radioembolization with 90Y Microspheres. Medical Radiology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-35423-9_6
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DOI: https://doi.org/10.1007/978-3-540-35423-9_6
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