Graphic illustration of different volume ultrasound probes, volume acquisitions, and beam characteristics. A: Free-hand acquisition where the probe is.

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Graphic illustration of different volume ultrasound probes, volume acquisitions, and beam characteristics. A: Free-hand acquisition where the probe is physically moved over the area of interest. B: Volume acquisition with a dedicated mechanical sweep. The transducer is maintained stationary, but the transducer elements are mechanically swept in an operator-selected angle of acquisition and speed. C: Graphic illustration of beam shape in a 2D matrix array probe demonstrating the full volume as acquired. Note that the probe is acquiring volumes electronically in both orthogonal directions that make focusing in the elevational plane possible. D: Shows the ability of the 2D matrix array to focus at any direction in 360 degrees. E: Graphic illustration of the scanning ability of 2D matrix arrays to obtain a biplanar image fully focused and rotated it real time. F: Shows lateral tilting ability of this probe. These features are unique to 2D matrix arrays. (Used with permission from Amy M. Lex MS, RT(R), RDMS, Philips Ultrasound, Bothell, WA, USA.) Source: Volume Sonography: Core Concepts for Clinical Practice, Fleischer's Sonography in Obstetrics and Gynecology: Textbook and Teaching Cases, 8e Citation: Fleischer AC, Abramowicz JS, Gonçalves LF, Manning FA, Monteagudo A, Timor IE, Toy EC. Fleischer's Sonography in Obstetrics and Gynecology: Textbook and Teaching Cases, 8e; 2017 Available at: https://obgyn.mhmedical.com/DownloadImage.aspx?image=/data/books/2231/fleischer8_ch45_f017-1a.png&sec=172969854&BookID=2231&ChapterSecID=172969815&imagename= Accessed: December 19, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved