New and future developments in ultrasonic imaging

The British Journal of Radiology
T A Whittingham

Abstract

In the first part of the review, recent developments in medical imaging technology are described. Developments in transducer materials and matching, leading to improvements in band-width and sensitivity are discussed. Improvements in dynamic range due to increased transducer sensitivity, lower electronic noise levels and more efficient filtering are then considered. The benefits of the application of digital signal processing (DSP) techniques to radiofrequency (RF) echo signals are described, including more precise filtering and beam forming, synthetic aperture and parallel receive beam forming. Finally, the current situation in regard to 1.5 D arrays, 3 D scanning, ultrasound computed tomography (UCT), harmonic imaging with contrast agents and elastography are discussed. In the second part, some predictions for future developments are made. These will be possible largely due to the power of DSP. Parallel transmissions will make more efficient use of time, allowing greater spatial and temporal resolution, and greater accuracy in Doppler imaging. Adaptive transmission tailoring will be used, where the pulse characteristics to each part of the image field are independently optimized, as will adaptive receive processing in which e...Continue Reading

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