Analysis of an Image-Guided Radiation Therapy protocol with fiducial markers in hypofractionated prostate radiotherapy
DOI:
https://doi.org/10.37004/sefm/2023.24.1.003Keywords:
Image-Guided Radiation Therapy, hypofractionation for prostate cancer, fiducial markers, intrafraction movementAbstract
The main objective of this work is to evaluate the validity of the Image-Guided Radiation Therapy (IGRT) protocol implemented in cases of prostate cancer with implantation of fiducial markers, as well as to determine the magnitude of intrafractional displacements during the first five sessions of a group of 32 patients treated throughout one year.
Two weeks prior to the CT adquisition, the patient is implanted with a set of minimum 3 intraprostatic gold fiducial markers. During the treatment, with the combined use of the Auto Beam Hold (ABH) system and the acquisition of paired kV-MV images, we can assess the correct positioning of the area to be treated and the patient.
From the results obtained, we found that certain patients accumulate most of the beam interruptions, which indicate us which ones had problems in the positioning from the beginning, and allows us to evaluate the possible extension of the monitoring in certain cases. The results of the displacements indicate that corrections lower than 5 mm are required in all cases.
The use of the Image-Guided Radiation Therapy (IGRT) protocols in cases of variable anatomies represents an improvement in the correct positioning of the patient and, consequently in the treatment administration.
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