logging in or signing up Ultrasound Safety and Recent Advances vb311 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 285 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: January 24, 2012 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript ULTRASOUND SAFETY AND RECENT ADVANCES : ULTRASOUND SAFETY AND RECENT ADVANCES Dr. Varun Babu MD Resident Dept. of Radiology AIMS, Cochin June 9, 2011 Ultrasound Safety : No study has shown any damaging effect of pulsed US at diagnostic intensities when applied to the intact fetus in utero There is no place in medicine for a ‘quick (inadequate) ultrasound’, or for ‘just to have a look’ (e.g. at a fetus) European Federation of Societies for Ultrasound in Medicine and Biology www.efsumb.org Ultrasound Safety Safety – some terms : Ultrasound intensity Energy flowing across a surface in unit time (W/cm2) B mode imaging ~ 175 m W/cm2 Spectral Doppler ~ 1600 m W/cm2 2 indices Mechanical Index (MI) Probability of mechanically induced damage MI of 1 warns possible damage Thermal Index (TI) Heating of tissues TIS and TIB TIS of 1 = tissue gets heated to a max. of 10C Safety – some terms 3D Ultrasound : 3D Ultrasound 3D and 4D Ultrasonography : Data can be acquired rapidly enough to allow display in real-time at low frame rates Display of complex anatomy like fetal face and the heart Most parts of the body don’t have clean surfaces for 3D rendering However reslicing in other planes help in some situations Viewing uterus in coronal plane for developmental anomalies 3D and 4D Ultrasonography Elastography : Elastography Elastography : Elasticity imaging – offers high contrast between tumors and host tissue Principle: obtain signals before and after applying a distorting force that creates an image of the tissue’s response (strain) Role in breast and prostate The need for antiviral therapy in hepatitis – assessed by measuring the liver elasticity (a measure of fibrosis) Elastography Contrast Ultrasound - Hemangioma : Contrast Ultrasound - Hemangioma Contrast Sonography : ‘Microbubble’ agents to enhance US signals – perfluorocarbons Allows continuous imaging for 5min after injection Stabilized by encapsulating in a membrane – denatured albumin or phospholipid Contrast Sonography Atherosclerotic plaque : Atherosclerotic plaque Stroke : Stroke Contrast Sonography - Uses : Demonstrate tissue perfusion at infarction sites Identify bleeding points Encorporated into European guidelines for hepatoma detection in cirrhosis As tracers – like radioisotope studies Role in cardiac perfusion studies (negative bolus) Therapeutic: vehicles for DNA, olignoucleotides Contrast Sonography - Uses Ultrasound Therapy : Ultrasound Therapy Ultrasound therapy : Tissue ablative therapy in oncology Principle: Thermal energy Similar to a radiotherapy approach but has more advantages More precise, rapid Easy to handle, no damage to adjacent tissues Can monitor effects with realtime ultrasound Disadvantage Usual limitations of US Ultrasound therapy Slide 16: This has been an attempt to just introduce the basics of ultrasound physics. Try to correlate as you acquire the skills Thank you You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.