## An Improved Receiver for Harmonic Motion Microwave Doppler Imaging

14th European Conference on Antennas and Propagation, EuCAP 2020, Copenhagen, Denmark, 15 - 20 March 2020

#### Abstract

© 2020 EurAAP.Harmonic motion microwave Doppler imaging is a novel imaging modality that combines focused ultrasound and radar techniques to obtain data based on mechanical and electrical properties of the tissue. In previous experimental studies, the Doppler component of the scattered signal is sensed and used to create 2D images of a tumor inside a homogeneous fat phantom. Due to the drawbacks of the receiver configuration, scanning time was high, the signal-to-noise ratio was low, and the multi-frequency operation was limited. In this study, we improved the receiving system with a low noise amplifier which led to an increase in signal-to-noise ratio and a decrease in data acquisition time. A breast phantom containing a cylindrical tumor of size 3 mm \times 3 mm inside a homogeneous fat was built to perform 2D scans. An area of 40 mm \times 40 mm is scanned in 45 minutes which is approximately 50% of the previous scanning time. Multiple vibration frequencies between 15 Hz - 60 Hz are used to create 2D images. With the enhancement of the signal-to-noise ratio, vibration frequencies higher than 35 Hz are used for the first time. Increase in the vibration frequency resulted in the improvement of resolution; however, signal-to-noise ratio deteriorated due to the decrease in the vibration amplitude.