Field output correction factors and electron fluence perturbation of the microSilicon and microSilicon X detectors

Delbaere, A.; Younes, T.; Simon, L.; Khamphan, C.; Vieillevigne, L.

doi:10.1088/1361-6560/ac5e5e

Cited by 1 publication

(3 citation statements)

References 20 publications

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“…It is worth noting that the turning point for the microSilicon detector results in an output correction factor larger than unity for 3 mm field size. All previous studies 10 , 11 , 12 , 13 , 14 on the microSilicon detector have analyzed field sizes larger than 4 mm and determined correction factors smaller than unity, which are consistent with our results for larger field diameters.…”

Section: Discussionsupporting

confidence: 92%

“…The detector has been shown to be suitable for small‐field dosimetry in previous studies. 10 , 11 , 12 , 13 , 14 It operates at 0 V and has an active diameter of 1.5 mm. It was orientated parallel to the beam, using the TRUFIX detector positioning system in the water phantom.…”

Section: Methodsmentioning

confidence: 99%

“…In this work, the microSilicon dector (Type 60023, PTW Freiburg, Germany), which is an unshielded silicon diode detector was used. The detector has been shown to be suitable for small‐field dosimetry in previous studies 10–14 . It operates at 0 V and has an active diameter of 1.5 mm.…”

Section: Methodsmentioning

confidence: 99%

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Experimental and Monte Carlo based dosimetric investigation of a novel 3 mm radiosurgery 3 MV beam using the microSilicon detector

Saße,

Albers,

Klassen

et al. 2024

J Applied Clin Med Phys

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BackgroundThe ZAP‐X system is a novel gyroscopic radiosurgical system based on a 3 MV linear accelerator and collimator cones with a diameter between 4 and 25 mm. Advances in imaging modalities to detect small and early‐stage pathologies allow for an early and less invasive treatment, where a smaller collimator matching the anatomical target could provide better sparing of surrounding healthy tissue.PurposeA novel 3 mm collimator cone for the ZAP‐X was developed. This study aims to investigate the usability of a commercial diode detector (microSilicon) for the dosimetric characterization of this small collimator cone; and to investigate the underlying small field perturbation effects.MethodsProfile measurements in five depths as well as PDD and output ratio measurements were performed with a microSilicon detector and radiochromic EBT3 films. In addition, comprehensive Monte Carlo simulations were performed to validate the measurement observations and to quantify the perturbation effects of the microSilicon detector in these extremely small field conditions.ResultsIt is shown that the microSilicon detector enables an accurate dosimetric characterization of the 3 mm beam. The profile parameters, such as the FWHM and 20%–80% penumbra width, agree within 0.1 to 0.2 mm between film and detector measurements. The output ratios agree within the measurement uncertainty between microSilicon detector and films, whereas the comparisons of the PDD results show good agreement with the Monte Carlo simulations. The analysis of the perturbation factors of the microSilicon detector reveals a small field correction factor of approximately 3% for the 3 mm circular beam and a correction factor smaller than 1.5% for field diameters above 3 mm.ConclusionsIt could be shown that the microSilicon detector is well‐suitable for the characterization of the new 3 mm circular beam of the ZAP‐X system.

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