A two dimensional silicon detectors array for quality assurance in stereotactic radiotherapy: MagicPlate‐512

Aldosari, A. H.; Petasecca, Marco; Espinoza, Anthony A; Newall, Matthew; Fuduli, Iolanda; Porumb, C.; Alshaikh, Sami; Alrowaili, Z.A.; Weaver, Michael; Metcalfe, Peter E; Carolan, Martin G; Lerch, Michael L. F; Perevertaylo, Vladimir; Rosenfeld, Anatoly B.

doi:10.1118/1.4892384

Cited by 48 publications

(73 citation statements)

References 41 publications

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“…DUO array was irradiated up to 140 kGy in steps of 20 kGy. During irradiation, temperature was kept constant at 30 °C and no bias applied, respectively [13]. When a linac with photon energy higher than 10 MV is used, neutrons are produced by photons interacting with high-Z material located in the linac head (primary collimators, jaws, flattening filter) [25][26] [27] and any other material surrounding the beam.…”

Section: G Radiation Damagementioning

confidence: 99%

“…A total dose of 100 cGy has been delivered to achieve a good signal to noise ratio in the film measurements. The film analysis performed in this study is the same adopted by Aldosari et al [13]. Full width at half maximum (FWHM) and 20%-80% studies of the penumbra were performed and compared against the reference EBT3 film.…”

Section: H Charge Collection Efficiency Charge Sharing and Spatial Rementioning

confidence: 99%

“…Small field dosimetry requires instrumentation with very high spatial resolution (2 mm pitch or lower) as demonstrated by a study from Aldosari et al [13], combined with a small sensitive volume [14] and a fast readout mechanism to have a real-time feedback. Monolithic silicon detectors represent a valid alternative to achieve such requirements when compared to radiochromic films or ionization chambers [15].…”

Section: Introductionmentioning

confidence: 99%

“…Silicon detectors reveal a variation in the sensitivity and leakage current with the accumulated dose, as result of radiation damage [13][16] [17]. Charge sharing is also of concern for monolithic detector arrays which limits their spatial resolution due to charge drifting in the direction of neighbor electrodes when an event occurs between pixels [18].…”

Section: Introductionmentioning

confidence: 99%

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Characterisation of Silicon Diode Arrays for Dosimetry in External Beam Radiation Therapy

Porumb

Aldosari

Fuduli

et al. 2016

IEEE Trans. Nucl. Sci.

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Modern stereotactic radiation therapy modalities utilize small beams and large dose gradients to deliver radiation in few fractions, reducing the possibility to correct for mistakes during the treatment process. Therefore, in order to ensure best possible treatment for the patient, quality assurance for such treatments necessitates a stable, linear, and sensitive radiation detector with high spatial resolution and radiation hardness. In this work, two silicon detector arrays with high spatial resolution have been characterized by 6 MV and 18 MV medical LINAC irradiation, and 5.5 MeV He2+ heavy ion microprobe. A maximum discrepancy of 0.6 mm in field size has been found when comparing to two-dimensional radiochromic film dose profile, and charge collection efficiency obtained by means of ion beam induced charge collection (IBICC) is 66% when operating the array in photovoltaic mode. Radiation damage study by photons and photoneutrons is presented.

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Section: G Radiation Damagementioning

confidence: 99%

Section: H Charge Collection Efficiency Charge Sharing and Spatial Rementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterisation of Silicon Diode Arrays for Dosimetry in External Beam Radiation Therapy

Porumb

Aldosari

Fuduli

et al. 2016

IEEE Trans. Nucl. Sci.

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“…The addition of either a second orthogonal array of SV's or a complete 2D array of SV's would also allow for concurrent measurement of point dose and orthogonal beam profiles (or the entire beam profile in the case of a 2D array), which would provide further QA information in pencil beam scanning applications where the size and shape of the proton beam also need to be evaluated. The feasibility of this approach was recently demonstrated by the CMRP in development, characterization, and application of a 2D monolithic silicon pixel array (with submillimeter SVs and a pitch of 2 mm) in dose mapping on a medical linac 26, 27…”

Section: Discussionmentioning

confidence: 99%

Initial testing of a pixelated silicon detector prototype in proton therapy

Wroe

McAuley

Teran

et al. 2017

J Applied Clin Med Phys

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As technology continues to develop, external beam radiation therapy is being employed, with increased conformity, to treat smaller targets. As this occurs, the dosimetry methods and tools employed to quantify these fields for treatment also have to evolve to provide increased spatial resolution. The team at the University of Wollongong has developed a pixelated silicon detector prototype known as the dose magnifying glass (DMG) for real‐time small‐field metrology. This device has been tested in photon fields and IMRT. The purpose of this work was to conduct the initial performance tests with proton radiation, using beam energies and modulations typically associated with proton radiosurgery. Depth dose and lateral beam profiles were measured and compared with those collected using a PTW parallel‐plate ionization chamber, a PTW proton‐specific dosimetry diode, EBT3 Gafchromic film, and Monte Carlo simulations. Measurements of the depth dose profile yielded good agreement when compared with Monte Carlo, diode and ionization chamber. Bragg peak location was measured accurately by the DMG by scanning along the depth dose profile, and the relative response of the DMG at the center of modulation was within 2.5% of that for the PTW dosimetry diode for all energy and modulation combinations tested. Real‐time beam profile measurements of a 5 mm 127 MeV proton beam also yielded FWHM and FW90 within ±1 channel (0.1 mm) of the Monte Carlo and EBT3 film data across all depths tested. The DMG tested here proved to be a useful device at measuring depth dose profiles in proton therapy with a stable response across the entire proton spread‐out Bragg peak. In addition, the linear array of small sensitive volumes allowed for accurate point and high spatial resolution one‐dimensional profile measurements of small radiation fields in real time to be completed with minimal impact from partial volume averaging.

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Real‐time high spatial resolution dose verification in stereotactic motion adaptive arc radiotherapy

Duncan

Newall

Caillet

et al. 2018

J Applied Clin Med Phys

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PurposeRadiation treatments delivered with real‐time multileaf collimator (MLC) tracking currently lack fast pretreatment or real‐time quality assurance. The purpose of this study is to test a 2D silicon detector, MagicPlate‐512 (MP512), in a complex clinical environment involving real‐time reconfiguration of the MLC leaves during target tracking.Methods MP512 was placed in the center of a solid water phantom and mounted on a motion platform used to simulate three different patient motions. Electromagnetic target tracking was implemented using the Calypso system (Varian Medical Systems, Palo Alto, CA, USA) and an MLC tracking software. A two‐arc VMAT plan was delivered and 2D dose distributions were reconstructed by MP512, EBT3 film, and the Eclipse treatment planning system (TPS). Dose maps were compared using gamma analysis with 2%/2 mm and 3%/3 mm acceptance criteria. Dose profiles were generated in sup‐inf and lateral directions to show the agreement of MP512 to EBT3 and to highlight the efficacy of the MLC tracking system in mitigating the effect of the simulated patient motion.ResultsUsing a 3%/3 mm acceptance criterion for 2D gamma analysis, MP512 to EBT3 film agreement was 99% and MP512 to TPS agreement was 100%. For a 2%/2 mm criterion, the agreement was 95% and 98%, respectively. Full width at half maximum and 80%/20% penumbral width of the MP512 and EBT3 dose profiles agreed within 1 mm and 0.5 mm, respectively. Patient motion increased the measured dose profile penumbral width by nearly 2 mm (with respect to the no‐motion case); however, the MLC tracking strategy was able to mitigate 80% of this effect.Conclusions MP512 is capable of high spatial resolution 2D dose reconstruction during adaptive MLC tracking, including arc deliveries. It shows potential as an effective tool for 2D small field dosimetry and pretreatment quality assurance for MLC tracking modalities. These results provide confidence that detector‐based pretreatment dosimetry is clinically feasible despite fast real‐time MLC reconfigurations.

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A two dimensional silicon detectors array for quality assurance in stereotactic radiotherapy: MagicPlate‐512

Cited by 48 publications

References 41 publications

Characterisation of Silicon Diode Arrays for Dosimetry in External Beam Radiation Therapy

Characterisation of Silicon Diode Arrays for Dosimetry in External Beam Radiation Therapy

Initial testing of a pixelated silicon detector prototype in proton therapy

Real‐time high spatial resolution dose verification in stereotactic motion adaptive arc radiotherapy

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