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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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Ultrasonic Testing Using Phased ArraysOpen this link in a new window
   by www.ndt.net    
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Phased ArrayMRI Resource Directory:<br> - Probes Transducers -
 
A phased array probe applies voltage pulses to all elements as a group but with small time differences (phasing). The time difference is changed each time so that the sound pulses will be sent out in different directions.
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 Further Reading:
  Basics:
Ultrasonic Testing Using Phased ArraysOpen this link in a new window
   by www.ndt.net    
US Resources  
Calculation - PACS - Resources - History of UltraSound - Prenatal - Software
 
Annular ArrayInfoSheet: Probes/Transducers
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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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  Basics:
Physics Tutorial: Ultrasound PhysicsOpen this link in a new window
   by www.physics247.com    
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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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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    
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Ultrasound renal anatomyOpen this link in a new window
   by rad.usuhs.mil    
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Modes - Gynecology - UltraSound Technician and Technologist Jobs - Research Labs - Musculoskeletal and Joint -
 
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