Clinical experience transitioning from IMRT to VMAT for head and neck cancer

Studenski, Matthew T.; Bar‐Ad, Voichita; Siglin, Joshua; Cognetti, David M.; Curry, Joseph M.; Tuluc, Madalina; Harrison, A

doi:10.1016/j.meddos.2012.10.009

Cited by 37 publications

(47 citation statements)

References 15 publications

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“…Several studies suggested that V 5 [11–14], V 10 [12, 14, 15], and MLD [14, 15, 17, 18] were correlated with radiation pneumonitis, although the determination of the contributors to radiation pneumonitis was challenging, since a variety of treatment/patient-related factors appeared to influence this risk.…”

Section: Discussionmentioning

confidence: 99%

“…There were several studies demonstrating that VMAT could reduce delivery time and MUs compared with IMRT [12–15]. Reduction of delivery time could decrease the possibility of the intrafraction patient motion that leads to target underdosage and/or worse OARs sparing.…”

Section: Discussionmentioning

confidence: 99%

“…However, a larger volume of lung receiving lower dose ( V 5 and V 10 ) in VMAT has been reported [10]. Dose volume histogram parameters of V 5 [11–14] and V 10 [12, 14, 15] have been showed to be the predictors of the radiation pneumonitis.…”

Section: Introductionmentioning

confidence: 99%

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An IMRT/VMAT Technique for Nonsmall Cell Lung Cancer

Zhao

Yang

Wang

et al. 2015

BioMed Research International

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The study is to investigate a Hybrid IMRT/VMAT technique which combines intensity modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT) for the treatment of nonsmall cell lung cancer (NSCLC). Two partial arcs VMAT, 5-field IMRT, and hybrid plans were created for 15 patients with NSCLC. The hybrid plans were combination of 2 partial arcs VMAT and 5-field IMRT. The dose distribution of planning target volume (PTV) and organs at risk (OARs) for hybrid technique was compared with IMRT and VMAT. The monitor units (MUs) and treatment delivery time were also evaluated. Hybrid technique significantly improved the target conformity and homogeneity compared with IMRT and VMAT. The mean delivery time of IMRT, VMAT, and hybrid plans was 280 s, 114 s, and 327 s, respectively. The mean MUs needed for IMRT, VMAT, and hybrid plans were 933, 512, and 737, respectively. Hybrid technique reduced V 5, V 10, V 30, and MLD of normal lung compared with VMAT and spared the OARs better with fewer MUs with the cost of a little higher V 5, V 10, and mean lung dose (MLD) of normal lung compared with IMRT. Hybrid IMRT/VMAT can be a viable radiotherapy technique with better plan quality.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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An IMRT/VMAT Technique for Nonsmall Cell Lung Cancer

Zhao

Yang

Wang

et al. 2015

BioMed Research International

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“…[1][2][3] IMRT modulates www.ksmp.or.kr rotations of gantry around a patient. 4,5) By virtue of these capability of IMRT and VMAT to deliver the superior dose distributions to those of the conventional 3D conformal radiation therapy (3D-CRT) technique, IMRT and VMAT have been adopted in the clinic rapidly and widely.…”

Section: Introductionmentioning

confidence: 99%

Gamma Evaluation with Portal Dosimetry for Volumetric Modulated Arc Therapy and Intensity-Modulated Radiation Therapy

et al. 2017

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“…Furthermore, the delivery times for VMAT treatments are shorter compared to IMRT treatments,5 potentially reducing the intra‐fractional patient movement during deliveries 6. VMAT deliveries require a complex treatment plan, involving three key dynamic components; (a) gantry rotation, (b) dose rate modulation, and (c) multi‐leaf collimator (MLC) motion, which are all simultaneously varied during the delivery 2, 3, 4, 5, 6, 7…”

Section: Introductionmentioning

confidence: 99%

A novel and independent method for time‐resolved gantry angle quality assurance for VMAT

Fuangrod

Greer

Zwan

et al. 2017

J Applied Clin Med Phys

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Volumetric‐modulated arc therapy (VMAT) treatment delivery requires three key dynamic components; gantry rotation, dose rate modulation, and multi‐leaf collimator motion, which are all simultaneously varied during the delivery. Misalignment of the gantry angle can potentially affect clinical outcome due to the steep dose gradients and complex MLC shapes involved. It is essential to develop independent gantry angle quality assurance (QA) appropriate to VMAT that can be performed simultaneously with other key VMAT QA testing. In this work, a simple and inexpensive fully independent gantry angle measurement methodology was developed that allows quantitation of the gantry angle accuracy as a function of time. This method is based on the analysis of video footage of a “Double dot” pattern attached to the front cover of the linear accelerator that consists of red and green circles printed on A4 paper sheet. A standard mobile phone is placed on the couch to record the video footage during gantry rotation. The video file is subsequently analyzed and used to determine the gantry angle from each video frame using the relative position of the two dots. There were two types of validation tests performed including the static mode with manual gantry angle rotation and dynamic mode with three complex test plans. The accuracy was 0.26° ± 0.04° and 0.46° ± 0.31° (mean ± 1 SD) for the static and dynamic modes, respectively. This method is user friendly, cost effective, easy to setup, has high temporal resolution, and can be combined with existing time‐resolved method for QA of MLC and dose rate to form a comprehensive set of procedures for time‐resolved QA of VMAT delivery system.

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Clinical experience transitioning from IMRT to VMAT for head and neck cancer

Cited by 37 publications

References 15 publications

An IMRT/VMAT Technique for Nonsmall Cell Lung Cancer

An IMRT/VMAT Technique for Nonsmall Cell Lung Cancer

Gamma Evaluation with Portal Dosimetry for Volumetric Modulated Arc Therapy and Intensity-Modulated Radiation Therapy

A novel and independent method for time‐resolved gantry angle quality assurance for VMAT

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