A novel extrapolation method using OSL detectors for very small field output factor measurement for stereotactic radiosurgery

Huang, Te-An Polly; Morales, Johnny; Butson, Ethan; Johnson, A.C.; Butson, Martin J; Hill, Robin

doi:10.1007/s13246-020-00859-2

Cited by 2 publications

(4 citation statements)

References 34 publications

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“…6,7 Many publications reported experimental dosimetric data of conical collimators for stereotactic radiosurgery. [8][9][10][11][12][13][14][15][16][17][18] However, in most of those publications, the reported dosimetric data were acquired in a diversity of setups, which makes difficult to establish comparisons. Moreover, in the light of the current knowledge, these reports have limitations such as: (i) OF are uncorrected in some publications.…”

Section: Introductionmentioning

confidence: 99%

“…13,14,16,19 There are several published works devoted to study the dosimetry of conical collimators using Monte Carlo simulations. 9,10,13,15,18,20 From those, and to the best of our knowledge, the work by Cheng et al 13 is the only one addressing the dosimetry of cones with a FFF beam. However, those authors only studied the cones manufactured by Varian Medical Systems (Palo Alto, CA).…”

Section: Introductionmentioning

confidence: 99%

“…One of the most critical parameters is the output factor (OF), which is especially sensitive to the detector used and to the field size 6,7 . Many publications reported experimental dosimetric data of conical collimators for stereotactic radiosurgery 8–18 . However, in most of those publications, the reported dosimetric data were acquired in a diversity of setups, which makes difficult to establish comparisons.…”

Section: Introductionmentioning

confidence: 99%

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Monte Carlo simulation of conical collimators for stereotactic radiosurgery with a 6 MV flattening‐filter‐free photon beam

Hermida-López

Sánchez-Artuñedo

Rodríguez³

et al. 2021

Medical Physics

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Purpose: Conical collimators, or cones, are tertiary collimators that attach to a radiotherapy linac and are suited for the stereotactic radiosurgery treatment of small brain lesions. The small diameter of the most used cones makes difficult the acquisition of the dosimetry data needed for the commissioning of treatment planning systems. Although many publications report dosimetric data of conical collimators for stereotactic radiosurgery, most of the works use different setups, which complicates comparisons. In other cases, the cone output factors reported do not take into account the effect of the small cone diameter on the detector response. Finally, few data exist on the dosimetry of cones with flattening-filter-free (FFF) beams from modern linac models. This work aims at obtaining a dosimetric characterization of the conical collimators manufactured by Brainlab AG (Munich, Germany) in a 6 MV FFF beam from a TrueBeam STx linac (Varian Medical Systems). Methods: Percentage depth dose curves, lateral dose profiles and cone output factors were obtained using Monte Carlo simulations for the cones with diameters of 4,

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Monte Carlo simulation of conical collimators for stereotactic radiosurgery with a 6 MV flattening‐filter‐free photon beam

Hermida-López

Sánchez-Artuñedo

Rodríguez³

et al. 2021

Medical Physics

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“…Numerous studies have availed the MC simulation technique for dosimetric evaluation of CCC from different vendors. [6][7][8][9] The works published by Cheng et al 6 are the well-known set of data published related to the dosimetry of the SRS cone for 6MV flattening filter-free (FFF) beam from Varian. However, Cheng et al work is limited to the comparison of simulated and measured output cone factors.…”

Section: Introductionmentioning

confidence: 99%

Modelling and commissioning validation of eclipse conical cone collimator for stereotactic radiosurgery using Monte Carlo simulation

Shende,

Dhoble,

Saroj

et al. 2024

J Radiother Pract

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Purpose: The miniaturized conical cones for stereotactic radiosurgery (SRS) make it challenging in measurement of dosimetric data needed for commissioning of treatment planning system. This study aims at validating dosimetric characteristics of conical cone collimator manufactured by Varian using Monte Carlo (MC) simulation technique. Methods & Material: Percentage depth dose (PDD), tissue maximum ratio (TMR), lateral dose profile (LDP) and output factor (OF) were measured for cones with diameters of 5mm, 7·5mm, 10mm, 12·5 mm, 15 mm and 17·5 mm using EDGE detector for 6MV flattening filter-free (FFF) beam from Truebeam linac. Similarly, MC modelling of linac for 6MVFFF beam and simulation of conical cones were performed in PRIMO. Subsequently, measured beam data were validated by comparing them with results obtained from MC simulation. Results: The measured and MC-simulated PDDs or TMRs showed close agreement within 3% except for cone of 5mm diameter. Deviations between measured and simulated PDDs or TMRs were substantially higher for 5mm cone. The maximum deviations at depth of 10cm, 20cm and at range of 50% dose were found 4·05%, 7·52%, 5·52% for PDD and 4·04%, 7·03%, 5·23% for TMR with 5mm cone, respectively. The measured LDPs acquired for all the cones showed close agreement with MC LDPs except in penumbra region around 80% and 20% dose profile. Measured and MC full-width half maxima of dose profiles agreed with nominal cone size within ± 0·2 mm. Measured and MC OFs showed excellent agreement for cone sizes ≥10 mm. However, deviation consistently increases as the size of the cone gets smaller. Findings: MC model of conical cones for SRS has been presented and validated. Very good agreement was found between experimentally measured and MC-simulated data. The dosimetry dataset obtained in this study validated using MC model may be used to benchmark beam data measured for commissioning of SRS for cone planning.

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A novel extrapolation method using OSL detectors for very small field output factor measurement for stereotactic radiosurgery

Cited by 2 publications

References 34 publications

Monte Carlo simulation of conical collimators for stereotactic radiosurgery with a 6 MV flattening‐filter‐free photon beam

Monte Carlo simulation of conical collimators for stereotactic radiosurgery with a 6 MV flattening‐filter‐free photon beam

Modelling and commissioning validation of eclipse conical cone collimator for stereotactic radiosurgery using Monte Carlo simulation

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