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 'transducer' 
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Result : Searchterm 'transducer' found in 13 terms [] and 169 definitions [])
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Bi-directional IlluminationMRI Resource Directory:<br> - UltraSound Physics -
 
For the flowprobe a vessel is positioned between transducers which generate wide beams of ultrasound to fully illuminate the vessel. The ultrasound beams alternately intersect the flowing blood in upstream and downstream directions. The flowmeter derives an accurate measure of the changes in transit time influenced by the motion of the blood.
See also Bi-directional Flow.
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Blanking DistanceMRI Resource Directory:<br> - UltraSound Physics -
 
The blanking distance is the minimum sensing range in an ultrasound proximity sensor. Blanking distance is a function of the ring down time of the transducer as the transducer must ring down before it can receive the sound reflected from the tissue.
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Bubble Specific ImagingInfoSheet: - Contrast Agents - 
Intro, 
Historical Development, 
Microbubbles,
etc.MRI Resource Directory:<br> - Contrast Agents -
 
Bubble specific imaging methods rely usually on non-linear imaging modes. These contrast imaging techniques are designed to suppress the echo from tissue in relation to that from a microbubble contrast agent.
Stimulated acoustic emission (SAE) and phase / pulse inversion imaging mode (PIM) are bubble specific modes, which can image the tissue specific phase.
In SAE mode bubble rupture is seen as a transient bright signal in B-mode and as a characteristic mosaic-like effect in velocity 2D color Doppler.
PIM are Doppler modes and detect non-linear echoes from microbubbles. In pulse inversion imaging modes the transducer bandwidth extends, resulting in improved spatial resolution and more contrast.
See also Contrast Pulse Sequencing, Microbubble Scanner Modification, Narrow Bandwidth, Contrast Medium, Dead Zone.
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 Further Reading:
  Basics:
Combination of contrast with stress echocardiography: A practical guide to methods and interpretationOpen this link in a new window
2004   by www.cardiovascularultrasound.com    
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Cardiac UltrasoundMRI Resource Directory:<br> - Cardiac -
 
Cardiac ultrasound, also known as echocardiography or echocardiogram, is used to provide several different levels and types of heart testing. Cardiac ultrasound utilizes the same ultrasound principles as used for obstetric and gynecologic evaluations of pregnant women, gallbladder ultrasound and other abdominal structures.
The ultrasound is directed out of a hand held probe which can be moved to image the heart from different positions. Additionally, so that heart events can be timed, ECG leads are placed on the chest. The reflected wave is converted into an actual image of the heart and displayed in a real-time mode or M-mode ultrasound format. M-mode recordings permit measurement of cardiac dimensions and detailed analysis of complex motion patterns depending on transducer angulations. Also the time relationships with other physiological variables such as ECG, heart sounds, and pulse tracings, can be recorded simultaneously. A stress echocardiogram provides information about the cardiac performance.
Two-dimensional tomographic images of selected cardiac sections give more information than M-mode about the shape of the heart and also show the spatial relationships of its structures during the cardiac cycle (diastole to systole).
See also M-Mode Echocardiography, and Myocardial Contrast Echocardiography.
Radiology-tip.comHeart Scintigraphy
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Radiology-tip.comCardiac MRI
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 Further Reading:
  Basics:
SURVEY OF DEVELOPMENTS IN CARDIAC AND CARDIOVASCULAR ULTRASOUND IMAGING(.pdf)Open this link in a new window
   by www.sea-acustica.es    
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Central Processing UnitMRI Resource Directory:<br> - Equipment and Parts -
 
(CPU) The CPU is the brain of the ultrasound machine, the main processor in the computer.
The CPU executes complex computer programs to send electrical currents to the transducer probe to emit sound waves, to receive the electrical pulses from the probes that were created from the returning echoes. The CPU does the calculations, data processing and forms the image on the display. The CPU also stores the processed data and/or image on disk.disk.
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