Technical Note: Evaluation of plastic scintillator detector for small field stereotactic patient‐specific quality assurance

Qin, Y; Gardner, Stephen; Kim, Joshua; Huang, Yimei; Doemer, Anthony; Chetty, Indrin J.

doi:10.1002/mp.12471

Cited by 14 publications

(24 citation statements)

References 27 publications

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“…PSD have been shown to produce less perturbations in the charged particle fluence and are therefore appropriate detectors for small field measurements. 8,9 Moreover, the small active volume (0.002 cc) of the PSD avoids volume averaging effects and the measured output values agreed well (within 3%) with the dose calculated from Monte Carlo (MC) simulations. [10][11][12] In contrast to diode detectors, PSD are energy independent and hence no daisy chain method was necessary.…”

Section: A Commissioning Mobiussupporting

confidence: 59%

Refinement of MLC modeling improves commercial QA dosimetry system for SRS and SBRT patient‐specific QA

2018

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Section: A Commissioning Mobiussupporting

confidence: 59%

Refinement of MLC modeling improves commercial QA dosimetry system for SRS and SBRT patient‐specific QA

2018

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“…The W1 is similar to the W2 but is 3 mm long. Qin et al found that the W1 agreed with RCF to within 3%, with an average difference of 0.31 ± 1.20% …”

Section: Discussionmentioning

confidence: 94%

“…Miniature plastic scintillators have been developed that are nearly water equivalent . A commercial version of the detector described by Beddar et al, having dimensions 1 mm diameter and 3 mm long, has been investigated for measurements of depth dose and profiles of small fields, determination of field size correction factors for other detector types, small‐field dose measurements in heterogeneous media, and for patient‐specific QA of small‐field SRS plans . Recently, a second generation has been developed that is smaller, 1 mm instead of 3 mm length.…”

Section: Introductionmentioning

confidence: 99%

Use of a plastic scintillator detector for patient‐specific quality assurance of VMAT SRS

Snyder

Sullivan

et al. 2019

J Applied Clin Med Phys

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Purpose To evaluate a scintillator detector for patient‐specific quality assurance of VMAT radiosurgery plans. Methods The detector was comprised of a 1 mm diameter, 1 mm high scintillator coupled to an acrylic optical fiber. Sixty VMAT SRS plans for treatment of single targets having sizes ranging from 3 mm to 30.2 mm equivalent diameter (median 16.3 mm) were selected. The plans were delivered to a 20 cm × 20 cm x 15 cm water equivalent plastic phantom having either the scintillator detector or radiochromic film at the center. Calibration films were obtained for each measurement session. The films were scanned and converted to dose using a 3‐channel technique. Results The mean difference between scintillator and film was ‒0.45% (95% confidence interval ‒0.1% to 0.8%). For target equivalent diameter smaller than the median, the mean difference was 1.1% (95% confidence interval 0.5% to 1.7%). For targets larger than the median, the mean difference was ‒0.2% (95% confidence interval ‒0.7% to 0.1%). Conclusions The scintillator detector response is independent of target size for targets as small as 3 mm and is well‐suited for patient‐specific quality assurance of VMAT SRS plans. Further work is needed to evaluate the accuracy for VMAT plans that treat multiple targets using a single isocenter.

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“…19,20 Several studies have reported the dosimetric characteristics of scintillation detectors and their use as dosimeters for quality assurance (QA) in proton therapy. [21][22][23][24][25][26][27][28][29][30] These studies showed that scintillator-based dosimetry systems offered a fast response and could be used as high-resolution dosimeter tools if the quenching effects were corrected. A commercially available scintillator-based dosimeter tool, Lynx (IBA Dosimetry, Louvain-la-Neuve, Belgium), has been used in proton beam measurements.…”

Section: Introductionmentioning

confidence: 96%

“…Several studies have reported the dosimetric characteristics of scintillation detectors and their use as dosimeters for quality assurance (QA) in proton therapy . These studies showed that scintillator‐based dosimetry systems offered a fast response and could be used as high‐resolution dosimeter tools if the quenching effects were corrected.…”

Section: Introductionmentioning

confidence: 99%

Feasibility study of a plastic scintillating plate‐based treatment beam fluence monitoring system for use in pencil beam scanning proton therapy

et al. 2019

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Purpose The purpose of this study was to describe a plastic scintillating plate‐based gantry‐attachable dosimetry system for pencil beam scanning proton therapy to monitor entrance proton beam fluence, and to evaluate the dosimetric characteristics of this system and its feasibility for clinical use. Methods The dosimetry system, consisting of a plastic scintillating plate and a CMOS camera, was attached to a dedicated scanning nozzle and scintillation during proton beam irradiation was recorded. Dose distribution was calculated from the accumulated recorded frames. The dosimetric characteristics (energy dependency, dose linearity, dose rate dependency, and reproducibility) of the gantry‐attachable dosimetry system for use with therapeutic proton beams were measured, and the feasibility of this system during clinical use was evaluated by determining selected quality assurance items at our institution. Results The scintillating plate shortened the range of the proton beam by the water‐equivalent thickness of the plate and broadened the spatial profile of the single proton spot by 11% at 70 MeV. The developed system functioned independently of the beam energy (<1.3%) and showed dose linearity, and also functioned independently of the dose rate. The feasibility of the system for clinical use was evaluated by comparing the measured quality assurance dose distribution to that of the treatment planning system. The gamma passing rate with a criterion of 3%/3 mm was 97.58%. Conclusions This study evaluated the dosimetric characteristics of a plastic scintillating plate‐based dosimetry system for use with scanning proton beams. The ability to account for the interference of the dosimetry system on the therapeutic beam enabled offline monitoring of the entrance beam fluence of the pencil beam scanning proton therapy independent of the treatment system with high resolution and in a cost‐effective manner.

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Technical Note: Evaluation of plastic scintillator detector for small field stereotactic patient‐specific quality assurance

Cited by 14 publications

References 27 publications

Refinement of MLC modeling improves commercial QA dosimetry system for SRS and SBRT patient‐specific QA

Refinement of MLC modeling improves commercial QA dosimetry system for SRS and SBRT patient‐specific QA

Use of a plastic scintillator detector for patient‐specific quality assurance of VMAT SRS

Feasibility study of a plastic scintillating plate‐based treatment beam fluence monitoring system for use in pencil beam scanning proton therapy

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