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 'Sound Beam' 
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Sound BeamMRI Resource Directory:<br> - UltraSound Physics -
 
(short for ultrasound beam) The sound beam is the confined, directional beam of ultrasound traveling as a longitudinal wave from the transducer face into the propagation medium. The near field and the far field are two separate regions along the beam. Sound beams are either steered mechanically or electrically. Both rapidly sweep sound waves through tissues.
See also Sheer Wave, Beam Vessel Angle, Beam Steering, and Huygens Principle.
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Ultrasonic Testing Using Phased ArraysOpen this link in a new window
   by www.ndt.net    
US Resources  
Preferential Sites - Breast - UltraSound Technician and Technologist Jobs - Doppler UltraSound - Gynecology - Endoscopic
 
2D-ModeInfoSheet: - Modes - 
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etc.MRI Resource Directory:<br> - Modes -
 
The 2D-mode (2-Dimensional-mode) is a spatially oriented B-mode (brightness) ultrasound. The imaged structures are displayed 2 dimensional as a function of depth and width. The brightness level is based on the echo signal amplitude.
Most of the ultrasound devices in medical imaging are 2D real-time scanner. The image is created by a rapidly back and forth swept sound beam over the region of interest.
See also Gray Scale.
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Basic ultrasound for cliniciansOpen this link in a new window
March 2006   by folk.ntnu.no    
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Transmission Line Matrix (TLM) modelling of medical ultrasound(.pdf)Open this link in a new window
   by www.era.lib.ed.ac.uk    
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Research Labs - Prenatal - Modes - History of UltraSound - Image Libraries - UltraSound Training Courses
 
Acoustic WindowMRI Resource Directory:<br> - UltraSound Physics -
 
The acoustic window or field is the area defined by the pathway of the ultrasound beam between the transducer and the acoustic reflector. The sound reflection to skin boundary should be minimized with an ultrasound gel where this gel acts as an acoustic window through which the image is seen.
Acoustic window refers also to the optimal placing of the transducers so that the areas of interest are clearly imaged.
See also Transforaminal Window, Transcranial Window, Transorbital Window and Transtemporal Window.
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Ultrasound renal anatomyOpen this link in a new window
   by rad.usuhs.mil    
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Angle of IncidenceMRI Resource Directory:<br> - UltraSound Physics -
 
(Doppler look angle) The angle of incidence is the angle at which the ultrasound beam strikes an interface, or the angle at which the Doppler beam intersects the blood flow. Doppler signals are best obtained at angles of 60° or less.
See also Snells Law.
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Education pool - Databases - Breast - Developers - Intravascular - Service and Repair
 
AnisotropicMRI Resource Directory:<br> - UltraSound Physics -
 
Anisotropic is an area or structure with varying acoustic properties according to the direction in which they are imaged. For example, the characteristic ultrasound appearances of tendons are hyperechoic, but they appear hypoechoic when the sound beam is not at right angles to the tendon fibers.
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