1：Experimental Design and Method Selection:

The study involved measuring dose linearity, dose rate dependence, output factors (OF), percentage depth doses (PDD), and off center ratio (OCR) for small photon beams using a CyberKnife system and comparing results with other detectors (PinPoint ionization chamber, diamond detector, microLion liquid ionization chamber, diode detector).

2：Sample Selection and Data Sources:

Measurements were performed on 6 different collimator sizes (5 mm to 30 mm) in a CyberKnife system, with data collected using a water phantom.

3：List of Experimental Equipment and Materials:

Equipment included PTW 60019 microDiamond detector, PTW 31014 PinPoint chamber, PTW 60003 diamond detector, PTW 31018 microLion, PTW 60008 diode detector, PTW MP3-XS water phantom, PTW UNIDOSE electrometer, and a linear accelerator (Clinac iX, Varian) for some measurements.

4：Experimental Procedures and Operational Workflow:

Dose linearity was measured at 100 cm SSD, 10x10 cm2 field, 5 cm depth with varying MU. Dose rate dependence was measured similarly with varying MU/min. OF was measured at 80 cm SAD, 1.5 cm depth for collimator sizes 5-60 mm. PDD was scanned from water surface to 25 cm depth at 80 cm SSD. OCR was measured at 80 cm SAD, 5 cm depth with lateral scans. All measurements were repeated three times for reliability.

5：5 cm depth for collimator sizes 5-60 mm. PDD was scanned from water surface to 25 cm depth at 80 cm SSD. OCR was measured at 80 cm SAD, 5 cm depth with lateral scans. All measurements were repeated three times for reliability. Data Analysis Methods:

5. Data Analysis Methods: Data were normalized and compared using linear fit functions for dose linearity, and differences were calculated in percentages for dose rate dependence, OF, PDD ratios, and penumbra sizes.