SU-E-T-133: Assessing IMRT Treatment Delivery Accuracy and Consistency On a Varian TrueBeam Using the SunNuclear PerFraction EPID Dosimetry Software

Dieterich, S; Trestrail, E; Holt, R; Saini, S; Pfeiffer, I; Kent, M; Hansen, K

doi:10.1118/1.4924494

Title: SU-E-T-133: Assessing IMRT Treatment Delivery Accuracy and Consistency On a Varian TrueBeam Using the SunNuclear PerFraction EPID Dosimetry Software

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Abstract

Purpose: To assess if the TrueBeam HD120 collimator is delivering small IMRT fields accurately and consistently throughout the course of treatment using the SunNuclear PerFraction software. Methods: 7-field IMRT plans for 8 canine patients who passed IMRT QA using SunNuclear Mapcheck DQA were selected for this study. The animals were setup using CBCT image guidance. The EPID fluence maps were captured for each treatment field and each treatment fraction, with the first fraction EPID data serving as the baseline for comparison. The Sun Nuclear PerFraction Software was used to compare the EPID data for subsequent fractions using a Gamma (3%/3mm) pass rate of 90%. To simulate requirements for SRS, the data was reanalyzed using a Gamma (3%/1mm) pass rate of 90%. Low-dose, low- and high gradient thresholds were used to focus the analysis on clinically relevant parts of the dose distribution. Results: Not all fractions could be analyzed, because during some of the treatment courses the DICOM tags in the EPID images intermittently change from CU to US (unspecified), which would indicate a temporary loss of EPID calibration. This technical issue is still being investigated. For the remaining fractions, the vast majority (7/8 of patients, 95% of fractions, and 96.6%more »« less

Authors:

Dieterich, S ^[1]; Trestrail, E; Holt, R ^[2]; Saini, S ^[3]; Pfeiffer, I ^[4]; Kent, M; Hansen, K ^[5]

UC Davis Medical Center, Sacramento, CA (United States)
Pacific Crest Medical Physics, Chico, CA (United States)
Sun Nuclear Corporation, Melbourne, FL (Australia)
VMTH, UC Davis, Davis, CA (United States)
Surgical and Radiological Sciences, UC Davis, Davis, CA (United States)

Publication Date:: Mon Jun 15 00:00:00 EDT 2015

OSTI Identifier:: 22545259

Resource Type:: Journal Article

Journal Name:: Medical Physics

Additional Journal Information:: Journal Volume: 42; Journal Issue: 6; Other Information: (c) 2015 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-2405

Country of Publication:: United States

Language:: English

Subject:: 60 APPLIED LIFE SCIENCES; 61 RADIATION PROTECTION AND DOSIMETRY; ACCURACY; CALIBRATION; COLLIMATORS; COMPUTER CODES; COMPUTERIZED TOMOGRAPHY; DOGS; DOSIMETRY; IMAGES; MUSCLES; PATIENTS; RADIATION DOSE DISTRIBUTIONS; RADIATION DOSES; RADIOTHERAPY; SHIELDS; TOLERANCE

Citation Formats


                    Dieterich, S, Trestrail, E, Holt, R, Saini, S, Pfeiffer, I, Kent, M, and Hansen, K. SU-E-T-133: Assessing IMRT Treatment Delivery Accuracy and Consistency On a Varian TrueBeam Using the SunNuclear PerFraction EPID Dosimetry Software.  United States: N. p., 2015. 
        Web.  doi:10.1118/1.4924494.

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                    Dieterich, S, Trestrail, E, Holt, R, Saini, S, Pfeiffer, I, Kent, M, & Hansen, K. SU-E-T-133: Assessing IMRT Treatment Delivery Accuracy and Consistency On a Varian TrueBeam Using the SunNuclear PerFraction EPID Dosimetry Software.  United States.  https://doi.org/10.1118/1.4924494

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                    Dieterich, S, Trestrail, E, Holt, R, Saini, S, Pfeiffer, I, Kent, M, and Hansen, K. 2015.  
        "SU-E-T-133: Assessing IMRT Treatment Delivery Accuracy and Consistency On a Varian TrueBeam Using the SunNuclear PerFraction EPID Dosimetry Software".  United States.  https://doi.org/10.1118/1.4924494.

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@article{osti_22545259,

  title        = {SU-E-T-133: Assessing IMRT Treatment Delivery Accuracy and Consistency On a Varian TrueBeam Using the SunNuclear PerFraction EPID Dosimetry Software},

  author       = {Dieterich, S and Trestrail, E and Holt, R and Saini, S and Pfeiffer, I and Kent, M and Hansen, K},

  abstractNote = {Purpose: To assess if the TrueBeam HD120 collimator is delivering small IMRT fields accurately and consistently throughout the course of treatment using the SunNuclear PerFraction software. Methods: 7-field IMRT plans for 8 canine patients who passed IMRT QA using SunNuclear Mapcheck DQA were selected for this study. The animals were setup using CBCT image guidance. The EPID fluence maps were captured for each treatment field and each treatment fraction, with the first fraction EPID data serving as the baseline for comparison. The Sun Nuclear PerFraction Software was used to compare the EPID data for subsequent fractions using a Gamma (3%/3mm) pass rate of 90%. To simulate requirements for SRS, the data was reanalyzed using a Gamma (3%/1mm) pass rate of 90%. Low-dose, low- and high gradient thresholds were used to focus the analysis on clinically relevant parts of the dose distribution. Results: Not all fractions could be analyzed, because during some of the treatment courses the DICOM tags in the EPID images intermittently change from CU to US (unspecified), which would indicate a temporary loss of EPID calibration. This technical issue is still being investigated. For the remaining fractions, the vast majority (7/8 of patients, 95% of fractions, and 96.6% of fields) are passing the less stringent Gamma criteria. The more stringent Gamma criteria caused a drop in pass rate (90 % of fractions, 84% of fields). For the patient with the lowest pass rate, wet towel bolus was used. Another patient with low pass rates experienced masseter muscle wasting. Conclusion: EPID dosimetry using the PerFraction software demonstrated that the majority of fields passed a Gamma (3%/3mm) for IMRT treatments delivered with a TrueBeam HD120 MLC. Pass rates dropped for a DTA of 1mm to model SRS tolerances. PerFraction pass rates can flag missing bolus or internal shields. Sanjeev Saini is an employee of Sun Nuclear Corporation. For this study, a pre-release version of PerFRACTION 1.1 software from Sun Nuclear Corporation was used.},

  doi          = {10.1118/1.4924494},

  url          = {https://www.osti.gov/biblio/22545259},
  journal      = {Medical Physics},

  issn         = {0094-2405},

  number       = 6,

  volume       = 42,

  place        = {United States},

  year         = {Mon Jun 15 00:00:00 EDT 2015},

  month        = {Mon Jun 15 00:00:00 EDT 2015}

}

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