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Fundamental ImagingMRI Resource Directory:<br> - Modes -
 
Fundamental imaging describes ultrasound imaging and Doppler modes in which the received signal is acquired and processed under the assumption of linear propagation and scattering.
See also Contrast Pulse Sequencing.
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    • Color Flow Imaging
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    • Superharmonic Imaging

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Subharmonic ImagingInfoSheet: - Modes - 
Intro, 
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Ultrasound waves are created at harmonics of the delivered frequency. Subharmonic imaging uses the harmonic oscillation of a system at a frequency that is a simple fraction of its fundamental frequency. The subharmonic response frequencies has half of the fundamental frequency. The second subharmonic has a half fundamental frequency of one half the frequency, and so on.
See also Harmonic Imaging and Superharmonic Imaging.
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Harmonic ImagingOpen this link in a new window
   by www.imasonic.com    
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Intermittent ImagingInfoSheet: - Modes - 
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etc.MRI Resource Directory:<br> - Modes -
 
Contrast microbubbles can be destroyed by intense ultrasound and the scattered signal level can increase abruptly for a short time during microbubble destruction, resulting in an acoustical flash (sudden increase in echogenicity).
Intermittent imaging with high acoustic output utilizes the properties of contrast microbubbles to improve blood-to-tissue image contrast by imaging intermittently at very low frame rates.
The frame rate is usually reduced to about one frame per second, or it is synchronized with cardiac cycles so that enough contrast microbubbles can flow into the imaging site where most microbubbles have been destroyed by the previous acoustic pulse. Because bubbles are destroyed by ultrasound, controlling the delay time between frames produces images whose contrast emphasizes regions with rapid blood flow rate or regions with high or low blood volume.
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Searchterm 'imaging' was also found in the following services: 
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Color Doppler ImagingInfoSheet: - Modes - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:<br> - Modes -
 
(CDI) Color Doppler imaging depicts the mean frequency shifts of the Doppler signal. Color [colour, Brit.] Doppler imaging is a method for visualizing direction and velocity of movement, such as of blood flow within the cardiac chambers or blood vessels. The flow direction and velocity information gathered by Doppler ultrasonography is color coded onto a gray scale cross-sectional image. The sensitivity of Doppler ultrasound is increased in conjunction with the use of vascular contrast agents.
Direction and blood flow velocity are coded as colors and shades:
Red - flow coming nearer to the probe.
Blue - flow coming away of the probe.
See also Bi-directional Illumination, Color Map.
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 Further Reading:
  News & More:
Success Rate of Transcranial Color-Coded Duplex Ultrasonography in Visualizing the Basal Cerebral Arteries in Vascular Patients Over 60 Years of AgeOpen this link in a new window
Thursday, 1 July 1999   by stroke.ahajournals.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    
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Release Burst ImagingInfoSheet: - Modes - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:<br> - Modes -
 
Release burst imaging is a method based on the combination of multiple high frequency, broadband-detection pulses with a separate release burst. Release burst imaging is optimally suited to the characteristic of ultrasound contrast agents.
This method allows to improve both contrast sensitivity and imaging resolution. Imaging and transient enhanced scattering can be optimized separately. The release burst mode can be combined with a Doppler method to remove residual clutter signals from moving tissue.
See also Repetition Rate.
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Three-Stage Approach to Ultrasound Contrast DetectionOpen this link in a new window
Wednesday, 4 July 2001   by folk.ntnu.no    
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