Theoretical Modeling and Simulation of XACT Based on the VIGAS

Le résumé fourni par la source

X-ray-induced acoustic computed tomography (XACT) is a novel hybrid imaging modality that uses short X-ray pulses to generate ultrasonic waves, combining the high contrast of X-ray absorption with the high resolution of ultrasound. We explore the feasibility and resolution of$\mathrm{X} / \gamma$-ray-induced acoustic computed tomography using the Very compact Inverse Compton scattering Gamma-ray Source (VIGAS), which provides quasi-monochromatic$<4.8 \text{MeV}$photon pulses of \~{} 10 ps duration. A theoretical model is developed for the acoustic wave generation by a pulsed X-ray, assuming Gaussian temporal and spatial energy deposition. Analytical formulas for the induced pressure and its frequency spectrum are derived, yielding expressions for characteristic frequency content and resolution limits. A simple simulation with a phantom model is built to examine the relationship between acoustic bandwidth and image resolution. The results indicate that the ultrashort 10 ps pulses from VIGAS enables sub-millimeter or even$10 \mu ~\mathrm{m}$spatial resolution in XACT with board acoustic spectrum. And the high photon energy allows a deep penetration and an extension of detectable depth. We discuss how the broad bandwidth improves image sharpness, and the trade-offs involving detector frequency response. In conclusion, VIGAS-driven XACT shows significant potential for deep, high-resolution imaging in medical diagnostics and nondestructive testing, leveraging the source's short pulses and tunable high energy.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.