Clinical evaluation of two new unshielded and shielded silicon diode detectors in external photon beam radiation therapy: SunSILICON and SunSILICON P
Abstract
Background: Advanced external photon beam radiotherapy requires dosimetry detectors with high spatial resolution and minimal perturbation effects. Silicon diode detectors are widely used due to their high sensitivity and small sensitive volumes, but fluence perturbation effects and energy dependence can affect performance and depend on detector construction. Shielded and unshielded configurations are used to address these challenges, but their clinical performance and limitations require systematic evaluation.
Purpose: This study aims to evaluate the clinical performance of two newly developed silicon diode detectors-SunSILICON (unshielded) and SunSILICON P (shielded)-for relative dosimetry in external photon beam radiotherapy. The detectors' response behaviors are compared to established detectors across the full clinical range of field sizes and beam energies, focusing on percentage depth dose (PDD) and lateral beam profile measurements.
Methods: PDD and lateral beam profile measurements across the full range of clinical field sizes were performed on Varian TrueBeam and Elekta Versa HD clinical linear accelerators with photon energies ranging from 4 to 25 MV, as well as a Nordion Eldorado 6 60Co unit, using various types of motorized water phantoms. Comparative measurements were performed with ionization chambers, as well as other silicon and diamond detectors. Over 600 scans were analyzed, and gamma analysis was applied to assess agreement using 0.5%/0.5 mm for PDDs and…
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