SU-E-T-104: Evaluation of the Dosimetric Properties of a Synthetic Single Crystal Diamond Detector in Clinical Proton Beams

Mandapaka, A; Verona-Rinati, G.; Ghebremedhin, A; Patyal, B

doi:10.1118/1.4814539

Cited by 3 publications

(4 citation statements)

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“…Model A (figure 2) of PTW-60019 microDiamond detector was based on available manufacturer specifications and reported geometrical details (Ciancaglioni et al 2012, Pimpinella et al 2012, Mandapaka et al 2013. Model B includes extra metallic pins ) that were assumed to be made of aluminum.…”

Section: Derivingmentioning

confidence: 99%

Output and ($k_{{{Q}_{{\rm clin},}}{{Q}_{{\rm msr}}}}^{{{\,f}_{{\rm clin},}}{{f}_{{\rm msr}}}}$ ) correction factors measured and calculated in very small circular fields for microDiamond and EFD-3G detectors

Alhakeem

Zavgorodni

2018

Phys. Med. Biol.

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The purpose of this work was to obtain [Formula: see text] factors for microDiamond and EFD-3G detectors in very small (less than 5 mm) circular fields. We also investigated the impact of possible variations in microDiamond detector design schematics on the calculated [Formula: see text] factors. Output factors (OF's) of 6 MV beams from TrueBeam linac collimated with 1.27-40 mm diameter cones were measured with EBT3 films, microDiamond and EFD-3G detectors as well as calculated (in water) using Monte Carlo (MC) methods. Based on EBT3 measurements and MC calculations [Formula: see text] factors were derived for these detectors. MC calculations were performed for microDiamond detector in parallel and perpendicular orientations relative to the beam axis. Furthermore, [Formula: see text] factors were calculated for two microDiamond detector models, differing by the presence or absence of metallic pins. The measured OFs agreed within 2.4% for fields ⩾10 mm. For the cones of 1.27, 2.46, and 3.77 mm maximum differences were 17.9%, 1.8% and 9.0%, respectively. MC calculated output factors in water agreed with those obtained using EBT3 film within 2.2% for all fields. MC calculated [Formula: see text] factors for microDiamond detector in fields ⩾10 mm ranged within 0.975-1.020 for perpendicular and parallel orientations. MicroDiamond detector [Formula: see text] factors calculated for the 1.27, 2.46 and 3.77 mm fields were 1.974, 1.139 and 0.982 with detector in parallel orientation, and these factors were 1.150, 0.925 and 0.914 in perpendicular orientation. Including metallic pins in the microDiamond model had little effect on calculated [Formula: see text] factors. EBT3 and MC obtained [Formula: see text] factors agreed within 3.7% for fields of ⩾3.77 mm and within 5.9% for smaller cones. Including metallic pins in the detector model had no effect on calculated [Formula: see text] factors. Our results show that microDiamond and EFD-3G detectors can be used in very small (1.27-3.77 mm) fields once [Formula: see text] corrections determined in this work are applied. Expected uncertainty of such measurements will be in the range of 8%-2.5%.

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Section: Derivingmentioning

confidence: 99%

Output and ($k_{{{Q}_{{\rm clin},}}{{Q}_{{\rm msr}}}}^{{{\,f}_{{\rm clin},}}{{f}_{{\rm msr}}}}$ ) correction factors measured and calculated in very small circular fields for microDiamond and EFD-3G detectors

Alhakeem

Zavgorodni

2018

Phys. Med. Biol.

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Section: Introductionmentioning

confidence: 99%

“…It has a 0.004 mm 3 cylindrical sensitive volume with a thickness of 1 μm and radius of 1.1 mm constituting it an ideal candidate for minibeam dosimetry. It has been extensively studied for use in photon, electron, and proton beam small fields [18][19][20][21][22][23] and has been used in micro-and minibeam measurements. 24,25 The presence of the PTW microDiamond detector in a small field can introduce perturbations, and radiation quality correction factors might be necessary to correct for the perturbations and improve dosimetric accuracy, especially in the case of reference dosimetry.…”

Section: Introductionmentioning

confidence: 99%

Radiation quality correction factors for improved dosimetry in preclinical minibeam radiotherapy

Sotiropoulos

Prezado

2022

Medical Physics

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Background In reference dosimetry, radiation quality correction factors are used in order to account for changes in the detector's response among different radiation qualities, improving dosimetric accuracy. Purpose Reference dosimetry radiation quality corrections factors for the PTW microDiamond were calculated for preclinical X‐ray and proton minibeams, and their impact in dosimetric accuracy was evaluated. Methods A formalism for the calculation of radiation quality correction factors for absolute dosimetry in minibeam fields was developed. Following our formalism, radiation quality correction factors were calculated for the PTW microDiamond detector, using the Monte Carlo method. Models of the detector, and X‐ray and proton irradiation platform, were imported into the TOPAS Monte Carlo simulation toolkit. The radiation quality correction factors were calculated in the following scenarios: (i) reference dosimetry open field to minibeam center of the central peak, (ii) different positions at the minibeam profile (along the peaks and valleys direction) to the center of the central minibeam, and (iii) some representative depth positions. In addition, the radiation quality correction factors needed for the calculation of the peak‐to‐valley dose ratio at different depths were calculated. Results An important overestimation of the dose (about 10%) was found in the case of the open to minibeam field for both X‐rays and proton beams, when the correction factors were used. Smaller differences were observed in the other cases. Conclusions The usage of the PTW microDiamond detector requires radiation quality correction factors in order to be used in minibeam reference dosimetry.

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“…5,[6][7][8][9] Su independencia con la tasa lo hace en principio favorable para medidas en haces sin filtro aplanador. 6,9 La invariancia de su respuesta con la energía ha supuesto también que se haya explorado su uso en otros rangos de energía de fotones, como la braquiterapia 10 e incluso otro tipo de partículas como electrones 3,5 y protones, 8,11 también con resultados satisfactorios.…”

Section: Introductionunclassified

Estudio de idoneidad de un detector basado en diamante sintético para la determinación de la dosis absorbida en tratamientos de arcoterapia de intensidad modulada

et al. 2021

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Se investigan las características de un detector basado en diamante sintético (PTW 60019 microDiamond) para la verificación dosimétrica de tratamientos realizados mediante arcoterapia de intensidad modulada (VMAT), para tres energías diferentes de fotones, 6MV con filtro aplanador, 6 y 10 MV sin filtro. Se contrasta su comportamiento frente a dos cámaras de ionización (PTW 31010 Semiflex, PTW 31016 PinPoint). El detector PTW 60019 presenta una respuesta estable en el tiempo, con variaciones menores a 0.31% en 7 meses. La incertidumbre típica relativa de la dosis absorbida en el punto de medida para las distribuciones asociadas a tratamientos de VMAT se estima en 3% con un nivel de confianza de 96.5% (k = 2.14). Los resultados para este detector muestran consistencia con el sistema de planificación dentro de la incertidumbre de medida en todos los casos salvo uno, mientras que las cámaras de ionización presentan diferencias por encima de 3% en volúmenes de tratamiento inferiores a 5 cm3 asociadas a inhomogeneidades en la distribución. El detector basado en diamante sintético ha demostrado su capacidad para medir dosis absorbida en distribuciones impartidas con VMAT en volúmenes de hasta 3 cm3, para haces de fotones de energías típicas usadas en radioterapia externa, sin presentar efectos de volumen o densidad significativos.

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SU-E-T-104: Evaluation of the Dosimetric Properties of a Synthetic Single Crystal Diamond Detector in Clinical Proton Beams

Cited by 3 publications

References 0 publications

Output and ($k_{{{Q}_{{\rm clin},}}{{Q}_{{\rm msr}}}}^{{{\,f}_{{\rm clin},}}{{f}_{{\rm msr}}}}$ ) correction factors measured and calculated in very small circular fields for microDiamond and EFD-3G detectors

Output and ($k_{{{Q}_{{\rm clin},}}{{Q}_{{\rm msr}}}}^{{{\,f}_{{\rm clin},}}{{f}_{{\rm msr}}}}$ ) correction factors measured and calculated in very small circular fields for microDiamond and EFD-3G detectors

Radiation quality correction factors for improved dosimetry in preclinical minibeam radiotherapy

Estudio de idoneidad de un detector basado en diamante sintético para la determinación de la dosis absorbida en tratamientos de arcoterapia de intensidad modulada

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