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 'Perivascular' 
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PerivascularMRI Resource Directory:<br> - Vascular -
 
Perivascular is the region around (surrounding) vessels.
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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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 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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Linear ProbeInfoSheet: Probes/Transducers
Intro,
Probes, 
TransducersMRI Resource Directory:<br> - Probes Transducers -
 
A linear probe contains one or more acoustic linear array transducer elements arranged in a line to send pulses of sound into a material. The linear array gives a large probe surface (footprint) and near field. In Doppler mode, a linear probe operates a subset of its elements as a linear phased array and can thus steer the Doppler beam at a selected angle to the imaging beam. This is a popular configuration for peripheral vascular and perivascular scanning.
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  Basics:
Ultrasonic Testing Using Phased ArraysOpen this link in a new window
   by www.ndt.net    
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