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 'Annular Array' 
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Annular ArrayInfoSheet: Probes/Transducers
Intro,
Probes, 
TransducersMRI Resource Directory:<br> - Probes Transducers -
 
Annular arrays are transducer assemblies with circular or ringlike elements, used to focus the beam. Annular arrays must be steered mechanically since they can only be fired in an outward-inward progression due to the rings. Annular arrays reduce section thickness artifacts.
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• Related Searches:
    • Beamforming
    • Slice Thickness Artifact
    • Transducer Assembly
    • Beam Steering
    • Array

 Further Reading:
  Basics:
Physics Tutorial: Ultrasound PhysicsOpen this link in a new window
   by www.physics247.com    
US Resources  
Intravascular - Quality Advice - Databases - Research Labs - UltraSound Technician and Technologist Jobs - Supplies and Accessories
 
ArrayMRI Resource Directory:<br> - Probes Transducers -
 
Arrays are spatial arrangements of transducers or transducer elements.
See also Composite Array.

Array types used in ultrasound imaging:
point annular array - elements arranged in concentric circles;
point curved array - elements arranged along a convex curve;
point linear array - elements are arranged along a line;
point rectangular array - elements arranged in a rectangular pattern.
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 Further Reading:
  News & More:
Ultrasonic Testing Using Phased ArraysOpen this link in a new window
   by www.ndt.net    
US Resources  
UltraSound Technician and Technologist Career - Examinations - Endoscopic - UltraSound Physics - Equipment and Parts - Heart
 
Array TransducerInfoSheet: Probes/Transducers
Intro,
Probes, 
TransducersMRI Resource Directory:<br> - Probes Transducers -
 
An array transducer is composed of multiple piezoelectric crystal elements arranged in an array. Arrays are transducer assemblies with a row of elements, used to focus the beam.

Types of array transducers:
point Linear array transducer = the arrays are arranged along a line.
point Curvilinear or curved transducer = the arrays are arranged along a convex curve. A curved array is similar to a linear array except that the image created is a sector-type.
point Annular array transducer = the arrays are arranged in concentric circles.
point Rectangular array transducer = the arrays are arranged in a rectangular pattern.
See also Amplitude Shading, Transducer Types, and Transducer Assembly.
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 Further Reading:
  Basics:
Transmission Line Matrix (TLM) modelling of medical ultrasound(.pdf)Open this link in a new window
   by www.era.lib.ed.ac.uk    
  News & More:
Ultrasound renal anatomyOpen this link in a new window
   by rad.usuhs.mil    
US Resources  
Preferential Sites - Intravascular - Distributors - Veterinary UltraSound - - Corporations
 
AU5 EPIInfoSheet: - Devices -
Intro, 
TypesMRI Resource Directory:<br> - Devices Machines Scanners Systems -
 
www.esaote.com/products/ultrasound/au5/products1.htm

From ESAOTE S.p.A.;
'The AU5 EPI is an ultrasound system for multi-disciplinary use that incorporates all the transducer technologies (linear, convex, phased array, and annular array) adapted to today's most diverse diagnostic requirements. Furthermore it offers the most modern and advanced techniques available today on the market.'

Specifications for this system will be available soon.

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 Further Reading:
  Basics:
AU5 EPI Product OverviewOpen this link in a new window
   by www.esaote.com    
US Resources  
Fetal - Equipment and Parts - Journals - Cardiac - Carotid - Ultrasound Gel
 
Composite ArrayMRI Resource Directory:<br> - Probes Transducers -
 
Composite arrays are combinations of piezoelectric ceramics and polymers that form a new material with different properties. Piezocomposites improve the performance of usual arrays such as the mechanically scanned annular array and the linear phased array.
Piezocomposites reduce the acoustic impedance with a better impedance match with tissue. The result is a reduction of the reverberation level in the near field. Unwanted surface waves propagating laterally over the transducer are suppressed. The composite materials allow to vary the electromechanical coupling constant, and to give better control over the trade-off between sensitivity and bandwidth.
See also Narrow Bandwidth, Dead Zone, Ultrasound Phantom.
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US Resources  
Breast - RIS - Ultrasound Gel - Endoscopic - Thyroid - Movies
 
Related Searches:
 • Sound Beam
 • Array
 • Slice Thickness Artifact
 • Beamforming
 • Transducer Assembly
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