In radiotherapy, accuracy and precision are key, and thus, a small deviation in dose
delivered by a treatment machine can be detrimental to patients. For this reason, in any
radiotherapy department, linacs that have been tuned to match each other dosimetrically
require critical assessment and evaluation since patients may be moved between linacs
without any adjustments to treatment plans. The main aim of this study was to assess and
evaluate the photon beam dosimetric accuracy between two beam-matched Elekta HD
linacs (Linac 2 and Linac 3) at St. Olav's Hospital in Norway. The dosimetric photon
beam data measured during the commissioning of the test Linac 2 were relatively
compared to that of Linac 3, which is the reference Linac. Also, as part of this study, the
new quality control data measured for the test Linac 2 has been compared to the annual
quality control data of the reference Linac 3 as well as three other linacs (Linac 4, Linac 5
and Linac 6) installed at the department which have also been tuned to match the
reference, in order to assess and evaluate the degree of deviations among these beammatched linacs. Comparison was also made in absolute dose terms. The photon beam
data (percentage depth doses, beam profiles and output factor) were acquired using an
IBA water phantom during the commissioning of the new test Linac 2. Quality control
tests were also performed to measure the flatness and symmetry of the beam profiles and
the beam quality index (D20/D10). Absolute dose calibration was also performed. These
dosimetric beam data measured for the new test linac were compared to that of the
department’s reference linac to assess and evaluate the degree of accuracy of the tuning
of the test linac and also the consistency among all the linac units.
Edu, F (2021). Assessment And Evaluation OF Photon Beam Dosimetric Accuracy Requirement of Tuning Medical Linear Accelerator. Afribary.com: Retrieved April 11, 2021, from https://afribary.com/works/assessment-and-evaluation-of-photon-beam-dosimetric-accuracy-requirement-of-tuning-medical-linear-accelerator
Frontiers, Edu. "Assessment And Evaluation OF Photon Beam Dosimetric Accuracy Requirement of Tuning Medical Linear Accelerator" Afribary.com. Afribary.com, 07 Apr. 2021, https://afribary.com/works/assessment-and-evaluation-of-photon-beam-dosimetric-accuracy-requirement-of-tuning-medical-linear-accelerator . Accessed 11 Apr. 2021.
Frontiers, Edu. "Assessment And Evaluation OF Photon Beam Dosimetric Accuracy Requirement of Tuning Medical Linear Accelerator". Afribary.com, Afribary.com, 07 Apr. 2021. Web. 11 Apr. 2021. < https://afribary.com/works/assessment-and-evaluation-of-photon-beam-dosimetric-accuracy-requirement-of-tuning-medical-linear-accelerator >.
Frontiers, Edu. "Assessment And Evaluation OF Photon Beam Dosimetric Accuracy Requirement of Tuning Medical Linear Accelerator" Afribary.com (2021). Accessed April 11, 2021. https://afribary.com/works/assessment-and-evaluation-of-photon-beam-dosimetric-accuracy-requirement-of-tuning-medical-linear-accelerator