Skip to content
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
medicine
Dosimetric and mechanical characteristics of a commercial dynamic μmLC used in SRS
Medical Physics, Volume 38, No. 7, Year 2011
Notification
URL copied to clipboard!
Description
Purpose: The aim of this work is to carry out mechanical and dosimetric assessments on a commercial dynamic micromulti leaf collimator system to be used for stereotactic radiosurgery (SRS) and stereotactic radiotherapy (SRT). Mechanical parameters such as leaf position accuracy with different gantry angles and leaf position reproducibility were measured. Also dosimetric measurements of the interleaf leakage, intraleaf transmission, penumbra width, and light field alignment were carried out. Furthermore, measurements of output factors (Scp) and in-air factors (Sc) for the μMLC system will be reported.Methods: EBT2 films were used to assess the leaf position error with gantry angle and after stress test, penumbra width and light field alignment. Leaf leakage was quantified using both EBT2 film and a pinpoint ion chamber. With regard to output factors, the pinpoint chamber was placed in a water phantom at 10 cm depth and 100 cm SSD. For in-air output factor measurements, 0.2 cm of brass was placed above the photon diode as build-up.Results: Measurements of mechanical parameters gave values of 0.05 cm (SD 0.035) for the average leaf position accuracy for different gantry angles and after stress test. Dosimetric measurements, yielded values of 0.22 ± 0.01 and 0.24 ± 0.01 cm, respectively, for side and head leaf penumbras. Also, average leaf abutting, leakage and transmission were found to be 0.65, 0.91, and 0.20%, respectively.Conclusions: (a) The add-on μMLC system in combination with our LINAC has been commissioned to be used for clinical purposes and showed good agreement with published results for different μMLC types. (b) This work has lead to the recommendation that leaves should be recalibrated after ten static beams or after each dynamic arc. © 2011 American Association of Physicists in Medicine.
Authors & Co-Authors
Galal, Mohamed Mahmoud
Ireland, Dublin
Hermitage Medical Clinic
Keogh, Sinéad
Ireland, Dublin
Hermitage Medical Clinic
Egypt, Giza
Faculty of Science
Khalil, Sultan
Ireland, Dublin
Hermitage Medical Clinic
Egypt, Giza
Faculty of Science
Statistics
Citations: 5
Authors: 3
Affiliations: 2
Identifiers
Doi:
10.1118/1.3601018
ISSN:
00942405
Research Areas
Cancer
Environmental
Health System And Policy