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Sensors 2014, 14(1), 549-563; doi:10.3390/s140100549
Article

A Novel Encoded Excitation Scheme in a Phased Array for The Improving Data Acquisition Rate

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Received: 8 October 2013 / Revised: 19 December 2013 / Accepted: 19 December 2013 / Published: 31 December 2013
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Spain 2013)
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Abstract

One of the challenges of phased array (PA) ultrasonic imaging systems is their limited capability to deal with real-time applications, such as echocardiography and obstetrics. In its most basic outline, these systems require emitting and receiving with the entire array for each image line to be acquired; therefore, with many image lines, a higher acquisition time and a lower frame rate. This constraint requires one to find alternatives to reduce the total number of emissions needed to obtain the whole image. In this work, we propose a new PA scheme based on the Code Division Multiple Access (CDMA) technique, where a different code is assigned to each steering direction, allowing the array to emit in several directions simultaneously. However, the use of encoding techniques produces a reduction of the image contrast because of the interferences between codes. To solve this, a new scheme based on merging several images is proposed, allowing the system to get close to the theoretical maximum frame rate, as well as to limit the loss of contrast, intrinsic to the technique.
Keywords: ultrasound imaging; phased arrays; CDMA (Code Division for Multiple Access); acquisition rate ultrasound imaging; phased arrays; CDMA (Code Division for Multiple Access); acquisition rate
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Gutiérrez-Fernández, C.; Jiménez, A.; Martín-Arguedas, C.J.; Ureña, J.; Hernández, Á. A Novel Encoded Excitation Scheme in a Phased Array for The Improving Data Acquisition Rate. Sensors 2014, 14, 549-563.

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