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 'Color Saturation' 
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Preferential Sites - Renal - Quality Advice - Veterinary UltraSound - Thyroid - Abdominal
 
Color SaturationMRI Resource Directory:<br> - UltraSound Physics -
 
Color saturation is a characteristic used for example to describe the vividness of a color, or the gradation of hue from unsaturated (white) to fully saturated (100% of the given color).
See also Directional Indicators, and Power Map.
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Kidney - - Obstetric - 4d UltraSound - Heart - Service and Repair
 
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    
US Resources  
Artifacts - 3d UltraSound - Fetal - Directories - Prenatal - Developers
 
Color Flow ImagingInfoSheet: - Modes - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:<br> - Modes -
 
(CFI) Color flow imaging is based on pulsed ultrasound Doppler technology. With this technique multiple sample volumes among multiple planes are detected and a color map for direction and velocity flow data is displayed.
Common mapping formats are BART (Blue Away, Red Towards) or RABT (Red Away, Blue Towards). Enhanced or variance flow maps show saturations and intensities that indicate higher velocities and turbulence or acceleration. Some maps utilize a third color (green) to indicate accelerating velocities and turbulence.
Color flow Doppler imaging is not as precise as conventional Doppler and is best used to scan a larger area and then use other Doppler modes to obtain more precise data.
See also Color Amplitude Imaging, Color Priority, and Color Saturation.
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Endoscopic - Vaginal - Directories - Prenatal - Safety - Intravascular
 
Color MapMRI Resource Directory:<br> - Doppler UltraSound -
 
In a color map, colors are allocated to Doppler shift frequencies corresponding to flow. Color (colour, Brit.) maps may also display Doppler amplitude, signal power, variance, or the gray levels of the B-mode image.
See also Color Amplitude Imaging, Color Priority, and Color Saturation.
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Examinations - Resources - General - Corporations - Contrast Agents - History of UltraSound
 
PersistenceInfoSheet: - Contrast Agents - 
Intro, 
Historical Development, 
Microbubbles,
etc.MRI Resource Directory:<br> - Contrast Agents -
 
The persistence of microbubbles is depended of the shell stability and the density of the gas.
This is defined by the equation:
(R x d)/(DIFS x constsat)
where R is the bubble radius, d the gas density, DIFS the gas diffusivity and constsat the saturation constant.
Microbubbles are stabilized with thin coatings of substances such as palmitic acid or by encapsulation in microspheres made with albumin, lipids, or polymers. Low-solubility low-diffusibility gases dramatically improve the persistence. Most recently developed ultrasound contrast agents combine these two approaches to prolong contrast enhancement.
Persistence is also a type of temporal smoothing used in both gray scale and color Doppler imaging. Successive frames are averaged as they are displayed to reduce the variations in the image between frames, hence lowering the temporal resolution of the image.
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