Photograph of the Optigodevice (Philips Medical Systems, Andover, MA, USA), the hand-held ultrasound system used in the present study

Copyright information: Taken from "Diagnostic ability of hand-held echocardiography in ventilated critically ill patients"Critical Care 2003;7(5):R84-R91.Published online 4 Aug 2003PMCID:PMC270721.Copyright © 2003 Vignon et al, licensee BioMed Central Ltd. This is an Open Access article: verbatim copying and redistribution of this article are permitted in all media for any purpose, provided this notice is preserved along with the article's original URL. A 20 cm ruler is shown at the bottom of the device.