In-vivo dosimetry in radiotherapy

The modern radiation treatment delivery techniques minimizes dose to the normal tissue and thereby increasing the prescribed dose to the tumor volume. Though there is an increase in the tumor control probability (TCP), the real advantage may be restricted by the probable raise in the normal tissue complication probability (NTCP). This necessitates the need for an accurate treatment delivery and measurement of dose delivered. The in-vivo dosimetry has become an integral part of verifying the treatment delivery to the patient. In-vivo dosimetry (IVD) is a vital component used to identify major deviations in treatment delivery as a part of quality assurance process thereby improving the quality of patient care in radiation therapy and is highly recommended by many international guidelines. The IVD does not imply that the dosimeter should necessarily be placed inside the living object. In EBRT, a dosimeter is normally placed on or near the surface of the patient, inside or in the neighborhood of the external beam