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 'Doppler Techniques' 
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Result : Searchterm 'Doppler Techniques' found in 1 term [] and 7 definitions [], (+ 10 Boolean[] results)
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Doppler TechniquesInfoSheet: - Modes - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:<br> - Modes -
 
Doppler techniques are dependent on the transducers used. The transducer operating in continuous wave mode utilizes one half of the elements and is continuously sending sound energy while the other half is continuously receiving the reflected signals. If the transducer is being used in a pulsed wave mode, the whole transducer is used to send and then receive the returning signals.
Pulsed wave techniques allow the accurate measurement of blood flow at a specific area in the heart and the detection of both velocity and direction. Measurement is performed by timing the reception of the returning signals giving a view of flows at specific depths. The region where flow velocities are measured is called the sample volume. Errors in the accuracy of the information arise if the velocities exceed a certain speed. The highest velocity accurately measured is called the Nyquist limit.
See also Doppler Velocity Signal and Doppler Effect.
point Continuous Wave Doppler
Used for accurate measurement of high Velocity flow. A disadvantage is the poor range of resolution.
point Pulsed Wave Doppler
Used for the measurement of velocities at a specific location with a good range of resolution. A disadvantage is the imprecise measuring of high velocities.
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• Related Searches:
    • Doppler Ultrasound
    • Medical Imaging
    • Color Flow Imaging
    • Doppler Angle
    • Doppler Shift

 Further Reading:
  Basics:
Doppler ultrasoundOpen this link in a new window
   by www.ob-ultrasound.net    
EXAMINATION TECHNIQUESOpen this link in a new window
   by www.medana.unibas.ch    
  News & More:
Transjugular intrahepatic portosystemic shuntOpen this link in a new window
   by en.wikipedia.org    
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    
US Resources  
Ultrasound Gel - Resources - Portals - Breast - Ultrasound Guided Interventions - Software
 
Abdominal UltrasoundMRI Resource Directory:<br> - Abdominal -
 
(AUS) Abdominal ultrasound, (TAE) transabdominal echography, abdomen sonography, sonogram, (FAST) focused assessment
Ultrasonography is an ideal clinical tool for determining the source of abdominal pain. An abdominal ultrasound includes the liver, gallbladder, biliary tree, pancreas, spleen, kidneys and blood vessels of the abdomen. Conventional ultrasound is cheap, safe, non-invasive and is a practical first line investigation. High resolution ultrasound, endoscopic ultrasound and contrast enhanced Doppler techniques assist in detecting small lesions. The best preparation is nothing to eat or drink from midnight the night before the exam (minimum 8 hours).

Indications:
point abdominal pain;
point stones in the gallbladder or kidneys;
point inflammation;
point cancer, metastasis.

FAST is a rapid diagnostic test of the trauma patient that sequentially detects the presence of free fluid in pericardium (hemopericardium) and in 4 views of the abdomen. These views, the right upper quadrant (RUQ), left upper quadrant (LUQ), the subcostal, and suprapubic views detect a hemoperitoneum in patients with potential truncal injuries. The Morison pouch between the liver and right kidney (RUQ) is a space in which intraperitoneal fluid can accumulate. Emergency abdominal ultrasonography is indicated for the evaluation of aortic aneurysm, appendicitis, and biliary and renal colic, as well as blunt or penetrating abdominal trauma.
See also Pelvic Ultrasound, Pregnancy Ultrasound, Prostate Ultrasound and Pediatric Ultrasound.
Radiology-tip.comAbdomen CT
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Radiology-tip.comAbdominal Imaging
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• View the news results for 'Abdominal Ultrasound' (1).



 Further Reading:
  Basics:
Starting Abdominal UltrasoundOpen this link in a new window
   by myweb.lsbu.ac.uk    
Bedside Limited Echocardiography by the Emergency Physician Is Accurate During Evaluation of the Critically Ill PatientOpen this link in a new window
2004   by www.ncbi.nlm.nih.gov    
Normal Anatomy of the Abdomen - UltrasoundsOpen this link in a new window
   by rad.usuhs.mil    
  News & More:
Optimizing Doppler and Color Flow US: Application to Hepatic Sonography(.pdf)Open this link in a new window
   by radiographics.rsna.org    
Renal Transplant Imaging and Intervention: Practical Aspects - 2Open this link in a new window
Tuesday, 11 August 1998   by www.radiology.co.uk    
Acute Appendicitis Diagnosed by UltrasoundOpen this link in a new window
   by rad.usuhs.mil    
Cirrhosis, Ultrasound findingsOpen this link in a new window
   by rad.usuhs.mil    
US Resources  
Resources - UltraSound Physics - Portals - Ultrasound Guided Interventions - Cardiac - Portable UltraSound
 
AngiographyMRI Resource Directory:<br> - Vascular -
 
Angiography means the imaging of veins and arteries. Without the need of X-rays, vessels and their surrounding tissue can be depicted with different methods including Doppler techniques to measure blood flow.
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• View the news results for 'Angiography' (1).



Searchterm 'Doppler Techniques' was also found in the following service: 
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Contrast Enhanced UltrasoundInfoSheet: - Contrast Agents - 
Intro, 
Historical Development, 
Microbubbles,
etc.MRI Resource Directory:<br> - Vascular -
 
(CEUS) Contrast agents increase the reflection of ultrasonic energy, improve the signal to noise ratio and caused by that the detection of abnormal microvascular and macrovascular disorders. Contrast enhanced ultrasound is used in abdominal ultrasound (liver sonography) as well as in cerebrovascular examinations e.g., for an accurate grading of carotid stenosis. The used contrast agents are safe and well tolerated.

The quality of the enhancement depends on:
point the concentration of the contrast agent;
point the type of injection, flow rate;
point the patient characteristics;
point the microbubble quality and properties of the filling gas and the shell.
The additional use of ultrasound contrast agents (USCAs) may overcome typical limitations like poor contrast of B-mode imaging or limited sensitivity of Doppler techniques. The development of new ultrasound applications (e.g., blood flow imaging, perfusion quantification) depends also from the development of pulse sequences for bubble specific imaging. In addition, contrast enhanced ultrasound improves the monitoring of ultrasound guided interventions like RF thermal ablation.
See also Contrast Enhanced Doppler Imaging, Contrast Harmonic Imaging, Contrast Imaging Techniques and Contrast Pulse Sequencing.
Radiology-tip.comContrast Enhanced Computed Tomography
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Radiology-tip.comContrast Enhanced MRI
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• View the news results for 'Contrast Enhanced Ultrasound' (1).



 Further Reading:
  Basics:
Guidelines and Good Clinical Practice Recommendations for Contrast Enhanced Ultrasound (CEUS)Open this link in a new window
2008   by www.efsumb.org    
  News & More:
Role of ultrasound and contrast-enhanced ultrasound in patients with cerebrovascular disease(.pdf)Open this link in a new window
Friday, 1 March 2002   by eurheartjsupp.oupjournals.org    
The clinical applications of contrast echocardiography(.pdf)Open this link in a new window
2000   by cme.medscape.com     
US Resources  
Journals - Probes Transducers - Resources - Rental - Databases - Musculoskeletal and Joint
 
Doppler EffectMRI Resource Directory:<br> - UltraSound Physics -
 
Christian Johann Doppler first described the effect of motion of sound sources and the frequency change of the sound to the observer.
Doppler ultrasound uses this effect to detect and measure blood flow, and the major reflector is the red blood cell. Doppler ultrasound depends on the fact that if the reflecting surface is moving in relation to the transducer (blood flowing in a vessel) the frequency of the received ultrasound wave will be different from that of the transmitted wave. If blood cells are moving towards the transducer, they increase the frequency of the returning signal. As cells move away from the transducer, the frequency of the returning signal decreases.
See also Quadrature Detection and Doppler Techniques.
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 Further Reading:
  Basics:
Basic ultrasound for cliniciansOpen this link in a new window
March 2006   by folk.ntnu.no    
  News & More:
Transmission Line Matrix (TLM) modelling of medical ultrasound(.pdf)Open this link in a new window
   by www.era.lib.ed.ac.uk    
US Resources  
Vascular - RIS - UltraSound Training Courses - Examinations - Gynecology - Veterinary UltraSound
 
Related Searches:
 • Doppler Ultrasound
 • Medical Imaging
 • Color Flow Imaging
 • Doppler Angle
 • Doppler Shift
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