RESEARCH Is the in vivo dosimetry w r in

In vivo dosimetry, recommended by various national and international organizations is a Quality Assurance tool to measure radiation dose delivered to patients dur-ing radiotherapy [1-5]. These measurements can be compared to the planned doses specified by the oncologist and calculated by the Treatment Planning System (TPS) for the target and critical organs (e.g. rec-tum or spinal cord). In this way set-up, calculation, mo-tion or transcription errors, that may have gone unnoticed during pre-treatment check, can be recovered. In the absence of errors, routine in vivo dose measure-ments document that the treatment was delivered correctly. Detectors commonly used for in vivo measurements are thermoluminescence dosimeters (TLDs), semicon