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 'Duplex' 
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Result : Searchterm 'Duplex' found in 2 terms [] and 8 definitions [])
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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:
    • Doppler Techniques
    • Venous Ultrasound
    • Doppler Angle
    • Intravascular Ultrasound
    • Doppler Ultrasound

 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  
Gall Bladder - Service and Repair - Cardiac - Distributors - Gynecology - Non-English
 
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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US Resources  
3d UltraSound - Safety - Developers - UltraSound Technician and Technologist Jobs - UltraSound Training Courses - UltraSound Technician and Technologist Schools
 
Color DopplerInfoSheet: - Modes - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:<br> - Doppler UltraSound -
 
(CD) Color Doppler is an ultrasound imaging mode, which visualizes the presence, direction and velocity of flowing blood in a wide range of flow conditions. It provides an estimate of the mean velocity of flow within a vessel by color coding the flow and displaying it superimposed on the 2D gray scale image. The flow direction is arbitrarily assigned the color red or blue, indicating flow toward or away from the transducer.
Color (colour, Brit.) Doppler ultrasound is capable of evaluating a wider area than other Doppler modes than for example Duplex or power Doppler, and therefore makes it less likely to miss flow abnormalities. It is also easier to interpret. Color flow is not as precise as conventional Doppler and is best used to scan a larger area and then use conventional Doppler for detailed analysis at a site of potential flow abnormality.

Adjustments for color Doppler in case of too much color:
point decreased color gain;
point increased color velocity scale;
point evaluation of chosen filter.

Adjustments for color Doppler in case of not enough color:
point increased color gain;
point decrease color velocity scale;
point adjust scanning plane and angle to flow;
point decrease sample box size;
point evaluation of chosen filter.
See also Color Power Doppler, Autocorrelation, Color Priority, Triplex Exam and Color Saturation.
Radiology-tip.comCerebral Blood Pool Imaging
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Radiology-tip.comBlood Flow Imaging,  Flow Effects
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• View the news results for 'Color Doppler' (2).



 Further Reading:
  Basics:
Doppler ultrasoundOpen this link in a new window
   by www.ob-ultrasound.net    
  News & More:
Mesenteric Ischemia: ImagingOpen this link in a new window
   by emedicine.medscape.com    
Placental insufficiency and fetal heart: Doppler ultrasonographic and biochemical markers of fetal cardiac dysfunctionOpen this link in a new window
   by herkules.oulu.fi    
Searchterm 'Duplex' was also found in the following services: 
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Compound B-ModeInfoSheet: - Modes - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:<br> - Modes -
 
Compound B-mode imaging takes different forms and refers to different methods of creating the ultrasound image.
Real-time compound ultrasound improves the image quality of B-mode scanning by combining ultrasound information obtained from multiple angles. The used averaging process of compound B-mode reduces artifacts and improves the representation of true image data.
B-mode images and Doppler mode images (see also Duplex) can be compounded on the display to improve the visualization of the anatomical relationships between vessels and the surrounding tissues.
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 Further Reading:
  News & More:
Ultrasound compounding with automatic attenuation compensation using paired angle scans(.pdf)Open this link in a new window
June 2006   by mi.eng.cam.ac.uk    
US Resources  
Renal - Corporations - Journals - Universities - Portable UltraSound - Non-English
 
Doppler UltrasoundInfoSheet: - Modes - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:<br> - Modes -
 
Doppler ultrasound is a medical imaging technique for calculating the relative velocity between two points by measuring the frequency shift of a sound wave transmitted from one point to the other, based on the Doppler effect. Continuous or pulsed Doppler is frequently used to examine cardiovascular blood flow. The combination of routine 2D-mode and Doppler ultrasound allows a complete evaluation of the heart's anatomy and function (including the fetal heart). See also Doppler Fluximetry in Pregnancy.
Doppler ultrasound depends on the fact that if a moving object reflects the ultrasound waves, the echo frequencies are changed. A higher frequency is created if the object is moving toward the probe//transducer and a lower frequency if it is moving away from it. How much the frequency is changed depends upon how fast the object is moving. Doppler ultrasound shows the different rates of blood flow in different colors on a monitor in real time.
The major Doppler parameters are the peak systolic velocity and the end-diastolic velocity. The peak systolic velocity ratio compensates the variability between different patients and instrumentations.

Different Doppler and duplex techniques:
list_point color Doppler;
list_point color power Doppler;
list_point continuous wave Doppler;
list_point contrast enhanced Doppler imaging;
list_point directional color power Doppler;
list_point duplex;
list_point harmonic power Doppler;
list_point pulse inversion Doppler;
list_point pulsed wave Doppler;
list_point spectral Doppler;
list_point transcranial Doppler.
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• View the news results for 'Doppler Ultrasound' (4).



 Further Reading:
  Basics:
Noninvasive Evaluation of Peripheral Arterial DiseaseOpen this link in a new window
   by ej.rsna.org    
  News & More:
Principles in Doppler EchocardiographyOpen this link in a new window
   by www.echoincontext.com    
Evaluation of lower extremity bypass grafts with use of color duplex sonographyOpen this link in a new window
Thursday, 30 June 2005   by radiographics.rsna.org    
Carotid artery color doppler ultrasound: 80-90% stenosis of the proximal internal carotid artery secondary to large atherosclerotic plaquesOpen this link in a new window
   by rad.usuhs.mil    
US Resources  
Vascular - UltraSound Training Courses - Non-English - - 4d UltraSound - Breast
 
Related Searches:
 • Vascular Ultrasound
 • Intravascular Ultrasound
 • Array Transducer
 • Doppler Angle
 • Echo
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