UltraSound - Technology Information PortalThursday, 18 April 2019
Info
  Sheets



Out-
      side
 




 
 'Sampling Rate' 
SEARCH FOR   
 
  12345ABCDEFGHIJKLMNOPQRSTUVWZ
Result : Searchterm 'Sampling Rate' found in 1 term [] and 3 definitions [], (+ 3 Boolean[] results)
1 - 5 (of 7)     next
Result Pages : [1]  [2]
US Resources  
Obstetric - Portable UltraSound - Education - Used and Refurbished UltraSound Equipment - Veterinary UltraSound - Rental
 
Sampling RateMRI Resource Directory:<br> - UltraSound Physics -
 
The sampling rate is the number of samples taken per unit of time. In digital signal processing (Nyquist theory) it is necessary to sample twice as fast as the highest frequency component.
spacer
• Related Searches:
    • Fahrenheit
    • Poiseulles Law
    • Blood Flow Velocity
    • Source Level
    • Pulse Repetition Frequency

 Further Reading:
  Basics:
Transmission Line Matrix (TLM) modelling of medical ultrasound(.pdf)Open this link in a new window
   by www.era.lib.ed.ac.uk    
Searchterm 'Sampling Rate' was also found in the following service: 
spacer
Radiology  (2) Open this link in a new window
Fast Fourier TransformationMRI Resource Directory:<br> - UltraSound Physics -
 
(FFT) The fast Fourier transformation is a particularly fast and efficient computational method of performing a Fourier transformation, which is the mathematical process by which raw data is processed into a usable image.
The fast Fourier transform analyzer is a common device that performs spectral analysis in ultrasound instruments. In this case, it displays different quadrature Doppler frequencies or reflector velocities when a sample volume cursor is used along time. The Doppler frequency is proportional to the spectral reflector velocity.
See also Proportionality Constant, and Sampling Rate.
spacer

 Further Reading:
  Basics:
Ultrasound and k-space K-space transforms of elementary geometriesOpen this link in a new window
   by dukemil.egr.duke.edu    
US Resources  
Rental - Safety - Heart - Image Quality - Ultrasound Gel - Manufacturers
 
Nyquist FrequencyMRI Resource Directory:<br> - UltraSound Physics -
 
The Nyquist frequency describes the highest frequency that can be sampled in a pulsed ultrasound system. To record higher frequencies the zero baseline can be shifted in the desired direction.
See also Nyquist Limit, and Sampling Rate.
spacer

 Further Reading:
  Basics:
Basic ultrasound for cliniciansOpen this link in a new window
March 2006   by folk.ntnu.no    
  News & More:
Ultrasound in diagnostic and therapyOpen this link in a new window
   by www.anst.uu.se    
US Resources  
Gall Bladder - Breast - Patient Information - Intravascular - Gynecology - Endoscopic
 
Nyquist LimitMRI Resource Directory:<br> - UltraSound Physics -
 
According to Shannon's sampling theorem, the sampling frequency should be twice the frequency being sampled. The nyquist frequency is the maximum frequency that can be sampled without aliasing. In ultrasound imaging, it is defined as half of the pulse repetition frequency.
NF = PRF/2 (nyquist frequency = pulse repetition frequency/2)
This is the so-called Nyquist limit. If the velocity of flow exceeds the Nyquist limit, the direction and velocity are inaccurately displayed and appear to change direction. Color flow Doppler capitalizes on this effect. This allows detecting flow disturbances from laminar to turbulent flow.
See also Aliasing Artifact, Repetition Rate, and Sampling Rate.
spacer

Searchterm 'Sampling Rate' was also found in the following service: 
spacer
Radiology  (2) Open this link in a new window
M-ModeInfoSheet: - Modes - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:<br> - Modes -
 
The M-mode (Motion-mode) ultrasound is used for analyzing moving body parts (also called time-motion or TM-mode) commonly in cardiac and fetal cardiac imaging. The application of B-mode and a strip chart recorder allows visualization of the structures as a function of depth and time. The M-mode ultrasound transducer beam is stationary while the echoes from a moving reflector are received at varying times.
A single beam in an ultrasound scan is used to produce the one-dimensional M-mode picture, where movement of a structure such as a heart valve can be depicted in a wave-like manner. The high sampling frequency (up to 1000 pulses per second) is useful in assessing rates and motion, particularly in cardiac structures such as the various valves and the chamber walls.
spacer

 Further Reading:
  Basics:
Basic ultrasound for cliniciansOpen this link in a new window
March 2006   by folk.ntnu.no    
  News & More:
ULTRASOUND MEASUREMENT OF THE EFFECT OF TEMPERATURE ON MICROPERFUSION IN THE EYEOpen this link in a new window
Thursday, 25 April 2002   by www.ncbi.nlm.nih.gov    
US Resources  
Service and Repair - Used and Refurbished UltraSound Equipment - Veterinary UltraSound - Movies - DICOM - Jobs
 
Related Searches:
 • Histogram
 • Center Frequency
 • Directional Indicators
 • Hemoglobin
 • Enhancement
SEARCH FOR   
 
  12345ABCDEFGHIJKLMNOPQRSTUVWZ
     1 - 5 (of 7)     next
Result Pages : [1]  [2]
 Random Page
 
Share This Page
FacebookTwitterLinkedIn

US-TIP    
Community   
User
Pass
Forgot your UserID/Password ?  


Look
      Ups



UltraSound - Technology Information Portal
Member of SoftWays' Medical Imaging Group - MR-TIP • Radiology-TIP • US-TIP • 
Copyright © 2006 - 2018 SoftWays. All rights reserved.
Terms of Use | Privacy Policy | Advertising
 [last update: 2015-03-04 09:17:02]