A method of beam–couch intersection detection

Muthuswamy, Moorthy S.; Lam, Kwok L.

doi:10.1118/1.598509

Cited by 27 publications

(19 citation statements)

References 5 publications

(3 reference statements)

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“…The solution was fast and elegant, with the known exception of not being patient specific. Several other investigators have since explored this class of solution for the collision avoidance problem with similar results …”

Section: Introductionmentioning

confidence: 92%

“…Additionally, the lack of reliable collision avoidance is a critical barrier to the delivery of advanced trajectory treatments in the future . While accurate collision detection and avoidance in radiotherapy has been investigated in different forms over the last few decades, a solid clinical implementation has not been widely adopted across the community. The goal of this work was to demonstrate and evaluate a fast and accurate patient specific collision avoidance framework for use during the normal simulation process.…”

Section: Introductionmentioning

confidence: 99%

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A priori patient-specific collision avoidance in radiotherapy using consumer grade depth cameras

2017

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

A priori patient-specific collision avoidance in radiotherapy using consumer grade depth cameras

2017

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“…In their study on head-and-neck cancer irradiation with a 6-MV photon beam, Vieira et al [19] measured 15% beam attenuation for a posterior oblique beam. Yorke [23] and Muthuswamy & Lam [14] calculated a range of forbidden gantry angles for specific patient setups. They investigated the extent of the beam attenuation with relation to the angle of beam incidence.…”

Section: Introductionmentioning

confidence: 99%

The Effect of a Carbon-Fiber Couch on the Depth-Dose Curves and Transmission Properties for Megavoltage Photon Beams

et al. 2007

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“…For patient treatments, the couch can both attenuate the treatment beam (and thereby impact the delivered dose) and collide with the treatment head. The problem of detecting beam–couch intersection was investigated by Muthuswamy and Lam; (30) a TPS couch model, such as the model of the kVue couch top in this study, is a useful, but incomplete, first‐order look into this problem.…”

Section: Discussionmentioning

confidence: 99%

Generation and verification of QFix kVue Calypso‐compatible couch top model for a dedicated stereotactic linear accelerator with FFF beams

Gardner

Gulam

Song

et al. 2015

J Applied Clin Med Phys

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This study details the generation, verification, and implementation of a treatment planning system (TPS) couch top model for patient support system used in conjunction with a dedicated stereotactic linear accelerator. Couch top model was created within the TPS using CT simulation images of the kVue Calpyso‐compatible couchtop (with rails). Verification measurements were compared to TPS dose prediction for different energies (6 MV FFF and 10 MV FFF) and rail configurations (rails in and rails out) using: 1) central axis point‐dose measurements with pinpoint chamber in water‐equivalent phantom at 42 gantry angles for various field sizes (2×2 cm2,4×4 cm2,10×10 cm2); and 2) Gafchromic EBT3 film parallel to beam in acrylic slab to assess changes in surface and percent depth doses in PA geometry. To assess sensitivity of delivered dose to variations in patient lateral position, measurements at central axis using the pinpoint chamber geometry were taken at lateral couch displacements of 2, 5, and 10 mm for 6 MV FFF. The maximum percent difference for point‐dose measurements was 3.24% (6 MV FFF) and 2.30% (10 MV FFF). The average percent difference for point‐dose measurements was less than 1.10% for all beam energies and rail geometries. The maximum percent difference between calculated and measured dose can be as large as 13.0% if no couch model is used for dose calculation. The presence of the couch structures also impacts surface dose and PDD, which was evaluated with Gafchromic film measurements. The upstream shift in the depth of dose maximum (dmax) was found to be 10.5 mm for 6 MV FFF and 5.5 mm for 10 MV FFF for ‘Rails In’ configuration. Transmission of the treatment beam through the couch results in an increase in surface dose (absolute percentage) of approximately 50% for both photon energies (6 MV FFF and 10 MV FFF). The largest sensitivity to lateral shifts occurred at the lateral boundary of the rail structures. The mean magnitude (standard deviation) of the deviation between shifted and centered measurements over all field sizes tested was 0.61% (0.61%) for 2 mm shifts, 0.46% (0.67%) for 5 mm shifts, and 0.86% (1.46%) for 10 mm shifts.PACS numbers: 87.56.‐v, 87.56.Da, 87.56.Fc

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A method of beam–couch intersection detection

Cited by 27 publications

References 5 publications

A priori patient-specific collision avoidance in radiotherapy using consumer grade depth cameras

A priori patient-specific collision avoidance in radiotherapy using consumer grade depth cameras

The Effect of a Carbon-Fiber Couch on the Depth-Dose Curves and Transmission Properties for Megavoltage Photon Beams

Generation and verification of QFix kVue Calypso‐compatible couch top model for a dedicated stereotactic linear accelerator with FFF beams

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