Ultrasound EBME410-1

Ultrasound EBME410-1 - Introduction Ultrasound Imaging...

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1 Ultrasound Imaging David L. Wilson, Ph. D. Department of Biomedical Engineering Case Western Reserve University, Cleveland, OH EBME 410/320 Some slide materials courtesy of Dr. Cheri Deng, U Mich. Introduction PULSE GENERATOR POWER AMPLIFIER TRANSDUCER T/R Switch Medium Basic Ultrasound System Transmit RF AMPLIFIER DIGITIZER Receive Processor to create image
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2 Ultrasound Ultrasound Machines Machines As compared to other medical imaging devices, ultrasound machines are small, portable, and inexpensive. Ultrasound probes come in all shapes and sizes. Here is a cardiac esophogeal probe. Ultrasound Imaging Ultrasound Imaging High-frequency (2-20 MHz) sound waves are used. Images consist of the amplitude of sound reflections from interfaces between internal organs. Reflection -> soft tissue contrast. Ultrasound images have speckle noise because many structures in tissue are the size of a wavelength ( 0.15 - 1.5 mm). Typically, a single sensor emits the high-frequency sound pulse ( send mode) and then listens for its return ( receive mode). Ultrasound devices are relatively inexpensive, tomographic, safe (no ionizing radiation), and fast (30 frames/sec). Sources of Information 1. Text book Chapter 16, and other books 2. Major professional societies/Conferences American Institute of Ultrasound in Medicine (AIUM) Acoustical Society of America (ASA) IEEE Ultrasonics, Ferroelectrics, and Frequency Control Society (IEEE UFFC) 3. Most important scientific journals Ultrasound in Medicine and Biology; IEEE UFFC; Journal of the Acoustical Society of America; Ultrasonics; American J. Cardiol., J. of Am. Soc. Echocardiography; Ultrasound in Medicine; Radiology, Invest. Radiol., Circulation, PNAS, etc 4. Major companies Siemens; GE; Phillips; Boston Scientific; Toshiba; Olympus Ultrasound Basics Sound is alternating regions of compression & rarefaction
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3 Ultrasound λ compression rarefaction Spatial location λ =C/f=sound speed/frequency T=1/f Waves are evident in both space and time!
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Ultrasound EBME410-1 - Introduction Ultrasound Imaging...

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