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Updated: Aug 16, 2026
Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
Published on: March 11, 2021
An analysis of an implantable dosimeter system for external beam therapy
Robert D Black1, Charles W Scarantino, Gregory G Mann
1Sicel Technologies, Morrisville, NC 27560, USA. bblack@siceltech.com
Background And Purpose:
To review the data from an implantable radiation dosimetry system used in a clinical setting and to examine correlations between dosimeter readings and potential causative error sources.
Materials And Methods:
MOSFET (metal oxide semiconductor field effect transistor) based encapsulated dosimeters were evaluated in a phantom (in vitro) and in a study with 18 patients. The dosimeters were placed in the gross tumor volume or in collateral normal tissue. Predicted dose values were established by imaging the dosimeters in the planning CTs.
Results:
The in vitro study confirmed that bounding cumulative errors due to setup, planning, and machine output within a +/-5% level is achievable. In patients, it was found that deviations from the targeted dose often exceeded the 5% level.
Conclusions:
The use of an implantable dosimeter system could provide an effective empiric check on the dose delivered at depth. Such a tool may have value for institutional quality assurance, as well as for therapy delivered to individual patients.
