Quality control procedures for dynamic treatment delivery techniques involving couch motion

In this study, the authors introduce and demonstrate quality control procedures for evaluating the geometric and dosimetric fidelity of dynamic treatment delivery techniques involving treatment couch motion synchronous with gantry and multileaf collimator (MLC). Tests were designed to evaluate posit...

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Bibliographic Details
Published in:Medical physics (Lancaster) 2014-08, Vol.41 (8Part1), p.081712-n/a
Main Authors: Yu, Victoria Y., Fahimian, Benjamin P., Xing, Lei, Hristov, Dimitre H.
Format: Article
Language:English
Subjects:
60 APPLIED LIFE SCIENCES
ACCURACY
Collimators
couch motion
Dosimetry
dynamic trajectory
FILM DOSIMETRY
Image guided radiation therapy
Kinematics
Linear accelerators
Motion
Multileaf collimators
Quality assurance
QUALITY CONTROL
RADIATION DOSES
radiation therapy equipment
Radiation treatment
Radiography
Radiometry
Radiotherapy - instrumentation
Radiotherapy - methods
Radiotherapy Dosage
ROTATION
Software
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Summary:In this study, the authors introduce and demonstrate quality control procedures for evaluating the geometric and dosimetric fidelity of dynamic treatment delivery techniques involving treatment couch motion synchronous with gantry and multileaf collimator (MLC). Tests were designed to evaluate positional accuracy, velocity constancy and accuracy for dynamic couch motion under a realistic weight load. A test evaluating the geometric accuracy of the system in delivering treatments over complex dynamic trajectories was also devised. Custom XML scripts that control the Varian TrueBeam™ STx (Serial #3) axes in Developer Mode were written to implement the delivery sequences for the tests. Delivered dose patterns were captured with radiographic film or the electronic portal imaging device. The couch translational accuracy in dynamic treatment mode was 0.01 cm. Rotational accuracy was within 0.3°, with 0.04 cm displacement of the rotational axis. Dose intensity profiles capturing the velocity constancy and accuracy for translations and rotation exhibited standard deviation and maximum deviations below 3%. For complex delivery involving MLC and couch motions, the overall translational accuracy for reproducing programmed patterns was within 0.06 cm. The authors conclude that in Developer Mode, TrueBeam™ is capable of delivering dynamic treatment delivery techniques involving couch motion with good geometric and dosimetric fidelity.
ISSN:0094-2405
2473-4209
DOI:10.1118/1.4886757