The method has been applied for the in-vivo dosimetry of 30 patients, treated with conformed beams for pelvic tumor, checking: anterior-posterior or posterior-anterior irradiations and lateral-lateral irradiations. Dating back to 1896, BJR ’s history is radiology’s history, and the journal has featured some landmark papers such as. BJR is the international research journal of the British Institute of Radiology and is the oldest scientific journal in the field of radiology and related sciences.
#Bjr supplement 25 pdf pdf#
This way, it is therefore possible to compare the dose, D m, TPS, obtained by a treatment planning system, with the in-vivo dose D m value, both defined at density middle point (identified along the beam central axis, where the thick material, in terms of g cm −2, above and below, is the same). BRITISH JOURNAL OF RADIOLOGY SUPPLEMENT 25 PDF Reliable. The method here proposed is based on the determination of the water-equivalent thickness of the patient, along the beam central axis, by the treatment planning system that makes use of the electron densities obtained by a computer tomography scanner, that works with calibrated Hounsfield numbers. Several tests were carried out in phantoms with asymmetric inhomogeneities. The method makes use of a set of correlation functions obtained by the S t and D m ratios, determined by irradiating a water-equivalent phantom with 6 MV, 10 MV and 5 MV X-ray beams. The use of a stable ion-chamber reduces many of the disadvantages associated to the use of diodes as their periodic recalibration and time consuming positioning.
#Bjr supplement 25 pdf free#
This work reports a practical method for the determination of the middle dose value, D m, on the central beam axis, using a signal S t, obtained by a small thimble ion-chamber positioned at the center of the electronic portal imaging device, and irradiated by the X-ray beam transmitted through the patient. Request PDF SU-E-T-536: Is BJR Supplement 25 Recommendation for Megavoltage Energy Independent Scatter Factor Still Valid for Flattening Filter Free Photon. As all methods for in-vivo dosimetry require special efforts many physicists are often discouraged in verifying the middle dose in a patient along the beam central axis. BJROpen is the international, fully open access, online research journal covering the whole of the radiological sciences, including radiology, radiation.
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