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 'Linear Array Transducer' 
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Result : Searchterm 'Linear Array Transducer' found in 1 term [] and 9 definitions [], (+ 9 Boolean[] results)
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Linear Array TransducerInfoSheet: Probes/Transducers
Intro,
Probes, 
TransducersMRI Resource Directory:<br> - Probes Transducers -
 
Linear array transducer elements are rectangular and arranged in a line. Linear array probes are described by the radius of width in mm. A linear array transducer can have up to 512 elements spaced over 75-120 mm. The beam produced by such a narrow element will diverge rapidly after the wave travels only a few millimeters. The smaller the face of the transducer, the more divergent is the beam. This would result in poor lateral resolution due to beam divergence and low sensitivity due to the small element size.
In order to overcome this, adjacent elements are pulsed simultaneously (typically 8 to 16; or more in wide-aperture designs). In a subgroup of x elements, the inner elements pulse delayed with respect to the outer elements. The interference of the x small divergent wavelets produces a focused beam. The delay time determines the depth of focus for the transmitted beam and can be changed during scanning.
Linear arrays are usually cheaper than sector scanners but have greater skin contact and therefore make it difficult to reach organs between ribs such as the heart. One-dimensional linear array transducers may have dynamic, electronic focusing providing a narrow ultrasound beam in the image plane. In the z-plane (elevation plane - perpendicular to the image plane) focusing may be provided by an acoustic lens with a fixed focal zone.
Rectangular or matrix transducers with unequal rows of transducer elements are two-dimensional (2D), but they are termed 1.5D, because the number of rows is much less than the number of columns. These transducers provide dynamic, electronic focusing even in the z-plane.
See also Rectangular Array Transducer.
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 Further Reading:
  Basics:
Ultrasound Physics Main differences between Ultrasound and X-rays, Velocity of sound in some Biological MaterialsOpen this link in a new window
   by www.drgdiaz.com    
  News & More:
Ultrasonic Testing Using Phased ArraysOpen this link in a new window
   by www.ndt.net    
US Resources  
Societies - Endoscopic - Portals - Liver - Developers - UltraSound Reimbursement
 
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  
3d UltraSound - Fetal - Manufacturers - Veterinary UltraSound - Pregnancy - Safety
 
Convex TransducerInfoSheet: Probes/Transducers
Intro,
Probes, 
TransducersMRI Resource Directory:<br> - Probes Transducers -
 
Convex transducers are today standard on every new scanner. A convex surface allows the scanning of a larger area with a smaller array. The method of focusing and beam sweeping of a convex or curvilinear / curved array is similar to a linear array transducer, except of the shape of the probe and the sector format of the created image.
The better fit to the body, caused by the curved shape with smaller convex contact surface, and the wider field of view further from the transducer face are advantages in abdominal ultrasound.
However, also a convex array is often too large to image the heart when probing between the ribs. Caused by combining a large field of view with smallest array size, phased array transducers are the best choice in cardiac ultrasound.
See also Curved Transducer.
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 Further Reading:
  News & More:
Ultrasound renal anatomyOpen this link in a new window
   by rad.usuhs.mil    
Searchterm 'Linear Array Transducer' was also found in the following service: 
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Resources  (3)  
 
DuplexInfoSheet: - Modes - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:<br> - Modes -
 
Duplex ultrasonography (duplex scan) consists of two ultrasound modalities to study blood flow and the perivascular tissue. This includes B-mode / gray scale imaging used in combination with spectral Doppler / pulsed-wave Doppler.
The real-time visualization of the vessels and tissue by the B-mode component improves the PW Doppler positioning and the direction of blood flow can be inferred. The angle between the direction of the PW Doppler signal and the estimated direction of blood flow can be measured.
Duplex techniques are available on phased array, linear array, and mechanical scanners. A phased array probe is able to create nearly simultaneous images and flow information. A linear array transducer can also do this if the Doppler probe is attached separately to one end of the scanhead. A mechanical transducer freeze the image; the crystals must be static to produce a Doppler image. The first two transducers are therefore the best choice for Duplex.
See also Compound B-Mode, and Duplex Scanner.
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 Further Reading:
  Basics:
MR angiography effective for diagnosing carotid artery stenosis - Patient Oriented Evidence That MattersOpen this link in a new window
September 2003   by www.findarticles.com    
Contrast-Enhanced Transcranial Color-Coded Duplex Sonography in Ischemic Cerebrovascular DiseaseOpen this link in a new window
Monday, 1 December 1997   by stroke.ahajournals.org    
  News & More:
Optimizing Doppler and Color Flow US: Application to Hepatic Sonography(.pdf)Open this link in a new window
   by radiographics.rsna.org    
Ultrasonographic fata morganaOpen this link in a new window
2003   by ndt.oxfordjournals.org    
US Resources  
Obstetric - Image Quality - Jobs - UltraSound Technician and Technologist Jobs - Non-English - Prenatal
 
Gallbladder UltrasoundMRI Resource Directory:<br> - Gall Bladder -
 
Sonography of the gallbladder is a reliable technique for diagnosing e.g., gallstones, cholecystitis, tumors, polyps, or ductal obstruction. Patient should be examined with empty stomach and on a low fat diet the night before. Barium studies, endoscopy, ERCP, colonoscopy, and abdominal CT should be performed after this examination.
Gallbladder ultrasound is best performed with a 5 MHz curved array or a linear array transducer in cases of a very superficial gallbladder. In obese patients or in patients with difficult sonographic access, a 3.5 MHz sector or curved linear transducer is advantageous.
Gallbladder and biliary tree are usually imaged in supine and posterior oblique (LPO) positions. Sometimes very small gallstones are better visible in upright and prone position.
Radiology-tip.comBiliary Contrast Agents
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Radiology-tip.comMagnetic Resonance Cholangiopancreaticography
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 Further Reading:
  Basics:
GALLBLADDER ULTRASONOGRAPHY PROCEDURE MANUAL(.pdf)Open this link in a new window
   by www.cdc.gov    
  News & More:
CholecystitisOpen this link in a new window
   by emedicine.medscape.com    
US Resources  
Jobs - 3d UltraSound - Equipment and Parts - UltraSound Technician and Technologist Jobs - Safety - Prenatal
 
Related Searches:
 • Transducer
 • Transducer Types
 • Probe
 • Absorbed Dose
 • Transcranial Doppler
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