9/11/2023 0 Comments Cobalt 60 machine![]() ![]() The entrance dose is quantified at the entrance of the beam while the exit dose refers to the radiation dose estimated at the exit point of the photon beam.ĭifferent types of in vivo dosimeters are used in external photon beam radiotherapy. This mode of dosimetry involves the measurement of two types of absorbed doses. In vivo dosimetry may be employed to detect errors in individual patients, assess errors in core procedures, evaluate the quality of specific treatment techniques or quantify the dose in cases where the dose estimation is inaccurate or difficult to calculate. ![]() Dosimeters placed in body cavities or on the patient’s skin measure the absorbed doses. In vivo dosimetry is another method for assuring quality in external photon beam radiotherapy and is performed whilst the patient is receiving treatment. These traditional quality assurance tools are used before radiotherapy, complicating the detection and rectification of treatment errors. These include port films treatment planning systems (TPS) and phantoms (used to simulate the human environment in the provision of scatter). Several tools are used to ensure the radiotherapy process is safe and effective. The radiation treatment process requires the control and assurance of quality in the overall treatment delivery. Image-guided radiotherapy is another type of external beam radiotherapy however, with this technique, the treatment is guided by images obtained from Computed Tomography or Magnetic Resonance Imaging. Compared to fixed beam radiotherapy (where there is no modulation in the beam delivered), with intensity-modulated radiotherapy, modulation of the photon beam involves using multi-leafs collimator and compensators. Several types of external photon beam radiotherapy exist.
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