Experimental evaluation and visualization of scattered X-ray with compact MiniPIX Timepix3 CdTe sensor in diagnostic radiology

초록

Scattered X-rays are a critical factor influencing both patient dose and image quality. This study aimed to evaluate scattered X-ray imaging in the diagnostic energy range using a MiniPIX Timepix3 detector equipped with a CdTe sensor. Irradiation conditions were set using a water phantom, with tube voltages ranging from 50 to 130 kVp and field sizes of 10 & times; 10, 20 & times; 20, and 25 & times; 25 cm2. Pixel regions centered within the X-ray field and phantom were analyzed, with region of interest (ROI) dimensions adapted based on the full width at half maximum (FWHM) of the lateral scatter profile. The backscattering factor (BSF) was measured using an ionization chamber and compared with Monte Carlo simulation and reference values from IAEA TRS-457. Additionally, the air kerma-area product (PKA) was measured and correlated with image-derived summed pixel values. The results confirmed that the MiniPIX detector, due to its high sensitivity and consistent correlation with dosimetric parameters, is suitable for scattered X-ray imaging. This study proposes a novel image-based approach for quantitative scatter evaluation and dose estimation, with potential applications in patient-specific quality control during clinical diagnostic radiology.

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