Silicon strip detector for a novel 2D dosimetric method for radiotherapy treatment verification

Bocci, A.; Cortés-Giraldo, M.A.; Gallardo, M. I.; Espino, J. M.; Arráns, R.; Álvarez, M. A. G.; Abou-Haïdar, Z.; Quesada, J. M.; Vega-Leal, A.P.; Nieto, F.J. Perez

doi:10.1016/j.nima.2012.01.018

Cited by 16 publications

(23 citation statements)

References 26 publications

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“…An ideal dosimeter has perfectly linear response as a function of the dose delivered [21]. To determine linearity, the detectors were irradiated using a medical linac at 'standard conditions', which refers to using a 6 MV linac and placing the detector at 1.5 cm depth in a water equivalent plastic phantom and irradiated by a 10 cm x 10 cm field at 600 …”

Section: E Linearitymentioning

confidence: 99%

“…The equalization factor was obtained by normalizing the response of each individual channel to the flat field (X i ) to the average response of all channels <X>, thus generating the equalization factor F i . To get the data equalized X eq-i , the response of each pixel X i is normalized by the equalization factor F i [21] as shown by (1). Three MP512 detector samples with different p-stop implantation concentrations were irradiated and their uniformity analyzed to evaluate their effect on the detector response.…”

Section: F Uniformitymentioning

confidence: 99%

“…Bocci et al [21] explored the use of a single-sided silicon strip detector (SSSSD) placed in a cylindrical phantom in the axial plane (parallel) to the incident beam in IMRT, to be used for 3D dose reconstruction, and found good agreement between the response of the detector, the reference ionization chamber, and Monte Carlo simulations as a function of beam angle. However the detector, which has been designed for high-energy physics, shows inappropriate spatial resolution for use in small-field dosimetry.…”

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: E Linearitymentioning

confidence: 99%

Section: F Uniformitymentioning

confidence: 99%

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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“…Different groups are working these days on silicon array detectors; taking advantage of their excellent spatial resolution and small size compared with ion chambers, their real‐time measurements compared with EBT3 and TLDs, and their high sensitivity compared with ion chambers and EBT3. In addition, they are less expensive than diamond detectors and have reasonable uniformity and are more practical compared with gel dosimetry.…”

Section: Introductionmentioning

confidence: 99%

“Characterization of ELEKTA SRS cone collimator using high spatial resolution monolithic silicon detector array”

shukaili

Corde

Petasecca

et al. 2018

J Applied Clin Med Phys

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PurposeTo investigate the accuracy of the dosimetry of radiation fields produced by small ELEKTA cone collimators used for stereotactic radiosurgery treatments (SRS) using commercially available detectors EBT3 GafchromicTM film, IBA Stereotactic diode (SFD), and the recently developed detector DUO, which is a monolithic silicon orthogonal linear diode array detector.MethodsThese three detectors were used for the measurement of beam profiles, output factors, and percentage depth dose for SRS cone collimators with cone sizes ranging from 5 to 50 mm diameter. The measurements were performed at 10 cm depth and 90 cm SSD.ResultsThe SRS cone beam profiles measured with DUO, EBT3 film, and IBA SFD agreed well, results being in agreement within ±0.5 mm in the FWHM, and ±0.7 mm in the penumbra region. The output factor measured by DUO with 0.5 mm air gap above agrees within ±1% with EBT3. The OF measured by IBA SFD (corrected for the over‐response) agreed with both EBT3 and DUO within ±2%. All three detectors agree within ±2% for PDD measurements for all SRS cones.ConclusionsThe characteristics of the ELEKTA SRS cone collimator have been evaluated by using a monolithic silicon high spatial resolution detector DUO, EBT3, and IBA SFD diode. The DUO detector is suitable for fast real‐time quality assurance dosimetry in small radiation fields typical for SRS/SRT. This has been demonstrated by its good agreement of measured doses with EBT 3 films.

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“…The equalization factor was obtained by normalising the response of each individual channel to the flat field (X i ) to the average response of all channels < ܺ >, thus generating the equalization factor F i . To get the data equalized X eq-i , the response of each pixel Y i is normalised by the equalisation factor F i [11] as shown by eq. 2.2 below.…”

Section: Dose Calibration and Equalization Proceduresmentioning

confidence: 99%

Characterisation of a cobalt-60 small-beam animal irradiator using a realtime silicon pixelated detector

et al. 2016

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Petasecca, M. (2016). Characterisation of a cobalt-60 small-beam animal irradiator using a realtime silicon pixelated detector. Journal of Instrumentation, 11 (4), P04014-1-P04014-14.Characterisation of a cobalt-60 small-beam animal irradiator using a realtime silicon pixelated detector AbstractThe paper presents a study performed by the Centre for Medical Radiation Physics (CMRP) using a high spatial and temporal resolution silicon pixelated detector named MagicPlate-512. The study focuses on the characterisation of three pencil beams from a low-dose rate, 6 TBq, cobalt-60 source, in terms of percentage depth dose, beam profiles, output factor and shutter timing. Where applicable, the findings were verified against radiochromic EBT3 film and ionization chambers. It was found that the results of the MagicPlate-512 and film agreed within 0.9 mm for penumbra and full-width at half-maximum measurements of the beam profiles, and within 0.75% for percentage depth dose study. The dose rate of the cobalt-60 source was determined to be (10.65±0.03) cGy/min at 1.5 cm depth in Solid Water. A significant asymmetry of the small pencil beam profile was found, which is due to the irregular machining of the small collimator. The average source shutter speed was calculated to be 26 cm/s. The study demonstrates that the MagicPlate-512 dosimetry system, developed at CMRP, is capable of beam characterisation even in cases of very low dose rate sources. ABSTRACT: The paper presents a study performed by the Centre for Medical Radiation Physics (CMRP) using a high spatial and temporal resolution silicon pixelated detector named MagicPlate-512. The study focuses on the characterisation of three pencil beams from a lowdose rate, 6 TBq, cobalt-60 source, in terms of percentage depth dose, beam profiles, output factor and shutter timing. Where applicable, the findings were verified against radiochromic EBT3 film and ionization chambers. It was found that the results of the MagicPlate-512 and film agreed within 0.9 mm for penumbra and full-width at half-maximum measurements of the beam profiles, and within 0.75% for percentage depth dose study. The dose rate of the cobalt-60 source was determined to be (10.65 ± 0.03) cGy/min at 1.5 cm depth in Solid Water. A significant asymmetry of the small pencil beam profile was found, which is due to the irregular machining of the small collimator. The average source shutter speed was calculated to be (65 ± 8) cm/s. The study demonstrates that the MagicPlate-512 dosimetry system, developed at CMRP, is capable of beam characterisation even in cases of very low dose rate sources.

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Silicon strip detector for a novel 2D dosimetric method for radiotherapy treatment verification

Cited by 16 publications

References 26 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

“Characterization of ELEKTA SRS cone collimator using high spatial resolution monolithic silicon detector array”

Characterisation of a cobalt-60 small-beam animal irradiator using a realtime silicon pixelated detector

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