This is a composite image of various 3D/4D ultrasound instruments This is a composite image of various 3D/4D ultrasound instruments. Window (A) shows a traditional off-line system setup where the main 2DUS machine (2) connects via its video-out port to a computer workstation (1) equipped with a video frame grabber card. Volumes are acquired manually (free-hand method) with the 2DUS machine via its 2D transducer, and post-processed and displayed at the off-line workstation (1). A position-sensing device, seen on the examination table, is externally attached to the 2D transducer to improve the registration process. Window (B) shows a dedicated volume ultrasound machine (3) where the volumes are acquired automatically with a mechanically swept transducer and later processed and displayed in the same unit. Window (C) shows several 2D and volume probes: (4) is a 2D matrix array probe; (5) is a conventional 2D probe. Note the small footprint of the matrix array transducer even though it packs a large amount of transducer elements; (6) is a transvaginal volume probe; and (7) a conventional 2D transvaginal probe. Note that both probes are of roughly the same size even though the volume transvaginal probe is housing a motor to sweep the transducer elements. Window (D) shows from left to right volume probes for transvaginal (8), transfontanelar for neonatal head imaging (9), transabdominal (10), and breast imaging (11). Source: VOLUME SONOGRAPHY: CORE CONCEPTS FOR CLINICAL PRACTICE, Sonography in Obstetrics and Gynecology: Principles & Practice, 7e Citation: Fleischer AC, Toy EC, Lee W, Manning FA, Romero RJ. Sonography in Obstetrics and Gynecology: Principles & Practice, 7e; 2014 Available at: https://obgyn.mhmedical.com/DownloadImage.aspx?image=/data/books/1414/fle_ch43_f018.png&sec=76397154&BookID=1414&ChapterSecID=76397115&imagename= Accessed: October 11, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved