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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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• Related Searches:
    • Echo
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    • Intravascular Ultrasound
    • Dwell Time
    • Doppler Angle

 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    
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Duplex ScannerInfoSheet: - Devices -
Intro, 
TypesMRI Resource Directory:<br> - Devices Machines Scanners Systems -
 
Duplex systems often combine a pulsed Doppler with a spectral display and a real time imaging system. A duplex scanner has usually an imaging transducer or a separate transducer used to collect continuous wave or pulsed Doppler signals, either simultaneously with imaging or sequentially.
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Duty FactorMRI Resource Directory:<br> - UltraSound Physics -
 
The duty factor is the product of the pulse duration and the pulse repetition frequency (the lapse of time the transducer is actively transmitting sound).
Most transducers are acting as the receiver 99 % of the time with a duty factor of 1.
See also Dwell Time.
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 Further Reading:
  Basics:
An Introduction to UltrasoundOpen this link in a new window
   by www.cis.rit.edu    
  News & More:
Superthreshold Behavior of Ultrasound-Induced Lung Hemorrhage in Adult RatsOpen this link in a new window
2006   by www.jultrasoundmed.org    
Searchterm 'transducer' was also found in the following services: 
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Dynamic FocusingMRI Resource Directory:<br> - Probes Transducers -
 
Dynamic focusing controls the axial position of the focus of an ultrasound beam. Dynamic focusing is often managed by controlling the phase of the signals detected by a transducer array.
See also Real-Time Transducer.
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 Further Reading:
  News & More:
Ultrasonic Testing Using Phased ArraysOpen this link in a new window
   by www.ndt.net    
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Supplies and Accessories - Non-English - Endoscopic - Rental - Pregnancy - Portals
 
EchoMRI Resource Directory:<br> - UltraSound Physics -
 
The echo is the part of the transmitted ultrasound that is reflected back to the receiving transducer crystal.
See also Sonographic Features.
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