QA of intensity-modulated beams using dynamic MLC log files

Kumar, Mukesh; Thirumavalavan, Nannan; Krishna, D Venugopal; Babaiah, M.

doi:10.4103/0971-6203.25668

Cited by 24 publications

(11 citation statements)

References 5 publications

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“…The correlation, then, between ArcCheck/film and PerFraction is of interest and has not yet been reported for any MLC log‐file‐based system for SBRT spine. Past investigations of PerFraction have been limited to its EPID dosimetry capabilities30, 31, 32 and some work has been performed on other MLC log‐file‐based systems, demonstrating good agreement between conventional QA and MLC log‐file‐based patient QA 33, 34, 35, 36. Discrepancies have been demonstrated between actual and intended MLC leaf delivery for low MU control points, with good agreement shown between MLC log‐file and diode array assessment methods 37.…”

Section: Discussionmentioning

confidence: 99%

Improving accuracy for stereotactic body radiotherapy treatments of spinal metastases

Rijken

Jordan

Crowe

et al. 2018

J Applied Clin Med Phys

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PurposeUse of SBRT techniques is now a relatively common recourse for spinal metastases due to good local control rates and durable pain control. However, the technique has not yet reached maturity for gantry‐based systems, so work is still required in finding planning approaches that produce optimum conformity as well as delivery for the slew of treatment planning systems and treatment machines.MethodsA set of 32 SBRT spine treatment plans based on four vertebral sites, varying in modality and number of control points, were created in Pinnacle. These plans were assessed according to complexity metrics and planning objectives as well as undergoing treatment delivery QA on an Elekta VersaHD through ion chamber measurement, ArcCheck, film‐dose map comparison and MLC log‐file reconstruction via PerFraction.ResultsAll methods of QA demonstrated statistically significant agreement with each other (r = 0.63, P < 0.001). Plan complexity and delivery accuracy were found to be independent of MUs (r = 0.22, P > 0.05) but improved with the number of control points (r = 0.46, P < 0.03); with use of 90 control points producing the most complex and least accurate plans. The fraction of small apertures used in treatment had no impact on plan quality or accuracy (r = 0.29, P > 0.05) but rather more complexly modulated plans showed poorer results due to MLC leaf position inaccuracies. Plans utilizing 180 and 240 control points produced optimal plan coverage with similar complexity metrics to each other. However, plans with 240 control points demonstrated slightly better delivery accuracy, with fewer MLC leaf position discrepancies.ConclusionIn contrast to other studies, MU had no effect on delivery accuracy, with the most impactful parameter at the disposal of the planner being the number of control points utilized.

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Section: Discussionmentioning

confidence: 99%

Improving accuracy for stereotactic body radiotherapy treatments of spinal metastases

Rijken

Jordan

Crowe

et al. 2018

J Applied Clin Med Phys

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“…Kumar et al. shows that log files can carry out IMRT QA with the same accuracy as film . Log files are also a viable method of VMAT QA for both phantom and patient geometries .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of machine log files/MC‐based treatment planning and delivery QA as compared to ArcCHECK QA

et al. 2018

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“…Methods for analysis and presentation of machine log files have been previously reported for linear accelerator‐(linac‐) based external beam radiation therapy (EBRT) treatments 9 , 10 , 11 , 12 , 13 . The MLC dynamic log files are available on Varian linac treatment machines (14) and have been utilized at the authors' institution and by other groups to validate the accuracy and completeness of the treatment deliveries 15 , 16 , 17 , 18 , 19 , 20 , 21 .…”

Section: Introductionmentioning

confidence: 99%

A software tool to automatically assure and report daily treatment deliveries by a cobalt‐60 radiation therapy device

Yang

Wooten

Green

et al. 2016

J Applied Clin Med Phys

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The aims of this study were to develop a method for automatic and immediate verification of treatment delivery after each treatment fraction in order to detect and correct errors, and to develop a comprehensive daily report which includes delivery verification results, daily image‐guided radiation therapy (IGRT) review, and information for weekly physics reviews. After systematically analyzing the requirements for treatment delivery verification and understanding the available information from a commercial MRI‐guided radiotherapy treatment machine, we designed a procedure to use 1) treatment plan files, 2) delivery log files, and 3) beam output information to verify the accuracy and completeness of each daily treatment delivery. The procedure verifies the correctness of delivered treatment plan parameters including beams, beam segments and, for each segment, the beam‐on time and MLC leaf positions. For each beam, composite primary fluence maps are calculated from the MLC leaf positions and segment beam‐on time. Error statistics are calculated on the fluence difference maps between the plan and the delivery. A daily treatment delivery report is designed to include all required information for IGRT and weekly physics reviews including the plan and treatment fraction information, daily beam output information, and the treatment delivery verification results. A computer program was developed to implement the proposed procedure of the automatic delivery verification and daily report generation for an MRI guided radiation therapy system. The program was clinically commissioned. Sensitivity was measured with simulated errors. The final version has been integrated into the commercial version of the treatment delivery system. The method automatically verifies the EBRT treatment deliveries and generates the daily treatment reports. Already in clinical use for over one year, it is useful to facilitate delivery error detection, and to expedite physician daily IGRT review and physicist weekly chart review.PACS number(s): 87.55.km

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QA of intensity-modulated beams using dynamic MLC log files

Cited by 24 publications

References 5 publications

Improving accuracy for stereotactic body radiotherapy treatments of spinal metastases

Improving accuracy for stereotactic body radiotherapy treatments of spinal metastases

Evaluation of machine log files/MC‐based treatment planning and delivery QA as compared to ArcCHECK QA

A software tool to automatically assure and report daily treatment deliveries by a cobalt‐60 radiation therapy device

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