Evaluation of delivered monitor unit accuracy of gated step‐and‐shoot IMRT using a two‐dimensional detector array

Cheong, Kwang Ho; Kang, Sei-Kwon; Lee, Me-Yeon; Kim, Su SSan; Park, Soah; Hwang, Tae‐Kon; Kim, Kyoung Ju; Oh, Do Hoon; Bae, Hyo-Sang; Suh, Tae-Suk

doi:10.1118/1.3310806

Cited by 9 publications

(8 citation statements)

References 12 publications

(11 reference statements)

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“…1. It mainly comprised three components: (1) a 2D IC array (MatriXX, IBA Dosimetry GmbH, Schwarzenbruck, Germany), 9 (2) a programmable motion table (Quasar, Modus Medical Devices Inc., Ontario, Canada), 10,11 and (3) two target phantoms: a cubic phantom for procedures of 4D modeling and an aperture lead block for MV x-ray irradiation.…”

Section: B Composite Phantom Systemmentioning

confidence: 99%

“…The statistical values of the positional errors obtained from our QA system are presented in column (9), Table IV. The absolute mean difference, sd, and "absolute mean difference + 2 sd" ranged from 0.22 to 0.70, 0.16 to 0.43, and 0.54 to 1.55, respectively (n = 13).…”

Section: B Video Image Analysismentioning

confidence: 99%

“…Table IV presents the statistical values of the 4D modeling function errors in column (8), the QA results for the positional errors in column (9), and the gimbal motion errors in column (10). The statistical error values for the QA results were compared to the 4D modeling function errors and those of the gimbal motion errors.…”

Section: E Comparison Of the Function Errors Gimbal Motion Errorsmentioning

confidence: 99%

“…Comparisons of statistical error values in the phantom QA study. The 4D modeling function errors are presented in column (8), the QA results for the positional errors are presented in column (9), and the gimbal motion errors are presented in column (10). The positional errors in column (9) were compared to the other errors in column (8) and (10).…”

Section: Peakmentioning

confidence: 99%

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Development of a video image‐based QA system for the positional accuracy of dynamic tumor tracking irradiation in the Vero4DRT system

et al. 2015

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The newly developed video image-based QA system, including in-house software, can analyze more than a thousand images (33 frames/s). Positional errors are approximately equivalent to those in ExacTrac log analyses. This system is useful for the visual illustration of the progress of the tracking state and for the quantification of positional accuracy during dynamic tumor tracking irradiation in the Vero4DRT system.

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Section: B Composite Phantom Systemmentioning

confidence: 99%

Section: B Video Image Analysismentioning

confidence: 99%

Section: E Comparison Of the Function Errors Gimbal Motion Errorsmentioning

confidence: 99%

Section: Peakmentioning

confidence: 99%

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Development of a video image‐based QA system for the positional accuracy of dynamic tumor tracking irradiation in the Vero4DRT system

et al. 2015

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“…This system only irradiates tumors in a specified respiratory phase region and uses an infrared reflective marker block placed on the patient's abdomen as an indicator of tumor motion. It has also been used in intensity modulated radiation therapy (IMRT), [1][2][3][4] and many clinics perform the gating method in volumetric modulated arc therapy (VMAT) with RapidArc (Varian Medical Systems, Palo Alto, CA) to reduce the respiratory motion-induced error in the complex treatment process. RapidArc optimizes dose distribution via the combination of gantry rotation speed, dose rate, and the dynamic motion of a multi-leaf collimator (MLC).…”

Section: Introductionmentioning

confidence: 99%

Dosimetric Analysis of Respiratory-Gated RapidArc with Varying Gating Window Times

et al. 2015

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cc This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.The gated RapidArc may produce a dosimetric error due to the stop-and-go motion of heavy gantry which can misalign the gantry restart position and reduce the accuracy of important factors in RapidArc delivery such as MLC movement and gantry speed. In this study, the effect of stop-and-go motion in gated RapidArc was analyzed with varying gating window time, which determines the total number of stop-and-go motions. Total 10 RapidArc plans for treatment of liver cancer were prepared. The RPM gating system and the moving phantom were used to set up the accurate gating window time. Two different delivery quality assurance (DQA) plans were created for each RapidArc plan. One is the portal dosimetry plan and the other is MapCHECK2 plan. The respiratory cycle was set to 4 sec and DQA plans were delivered with three different gating conditions: no gating, 1-sec gating window, and 2-sec gating window. The error between calculated dose and measured dose was evaluated based on the pass rate calculated using the gamma evaluation method with 3%/3 mm criteria. The average pass rates in the portal dosimetry plans were 98.72±0.82%, 94.91±1.64%, and 98.23±0.97% for no gating, 1-sec gating, and 2-sec gating, respectively. The average pass rates in MapCHECK2 plans were 97.80±0.91%, 95.38±1.31%, and 97.50±0.96% for no gating, 1-sec gating, and 2-sec gating, respectively. We verified that the dosimetric accuracy of gated RapidArc increases as gating window time increases and efforts should be made to increase gating window time during the RapidArc treatment process.

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Automatically gated image-guided breath-hold IMRT is a fast, precise, and dosimetrically robust treatment for lung cancer patients

et al. 2016

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Evaluation of delivered monitor unit accuracy of gated step‐and‐shoot IMRT using a two‐dimensional detector array

Abstract: The authors can conclude that gated IMRT is able to deliver an accurate dose to a patient during a procedure. The authors believe that the methodology and results can be transferred to other vendors' devices, particularly those that do not provide MLC log data for a verification purpose.

Cited by 9 publications

References 12 publications

Development of a video image‐based QA system for the positional accuracy of dynamic tumor tracking irradiation in the Vero4DRT system

Development of a video image‐based QA system for the positional accuracy of dynamic tumor tracking irradiation in the Vero4DRT system

Dosimetric Analysis of Respiratory-Gated RapidArc with Varying Gating Window Times

Automatically gated image-guided breath-hold IMRT is a fast, precise, and dosimetrically robust treatment for lung cancer patients

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