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English

صفحه اصلی / سی و دومین کنفرانس ملی و دهمین کنفرانس بین المللی مهندسی زیست پزشکی ایران

Fast Reflection-Mode Ultrasound Computed Tomography Versus Conventional Pulse-Echo Technique

نویسندگان :

Elnaz Rostami Siahpoush¹ Haniye Fathi² Zahra Kavehvash³

1- ُSharif University of Technology 2- Sharif University of Technology 3- Sharif University of Technology

کلمات کلیدی :

(Reflection ultrasound computed tomography (RUCT،pulse-echo ultrasound (US)،dual-probe phased arrays،diverging-wave transmission،Delay-and-Sum beamforming

چکیده :

Conventional pulse–echo ultrasound limits boundary depiction and contrast. We propose a dual-probe, phased-array reflection ultrasound computed tomography (RUCT) scheme in which one probe transmits diverging waves and the opposing probe records oblique echoes, providing near 360 ° angular coverage. The approach is evaluated in numerical simulations on generic heterogeneous 2-D phantoms under matched acquisition budgets. Images are reconstructed with delay-and-sum beamforming and compared with linear and single-probe phased acquisitions. The dual-probe, diverging configuration yields crisper delineation of convex and concave boundaries, stronger target-to-background separation, and more uniform intraregion intensity. The region-of-interest SNR and CNR increase consistently, while the diverging transmission reduces the number of shots, thereby decreasing the scan time and data volume required for comparable coverage. Although limited to simulations, the results indicate a practical route to fast, high contrast reflection tomography compatible with clinical arrays.