Magnetic Resonance - Technology Information Portal Welcome to MRI Technology
Info
  Sheets

Out-
      side
 



 
 MRI Database 
SEARCH FOR    
  2 3 5 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
1 - 5 (of 6)     next 
K--Ki     Kn-Kn   
MRI Resources 
Service and Support - Collections - Pacemaker - Stimulator pool - Education - MRI Centers
 
K-SpaceForum -
there are related threads
 
The k-space is an extension of the concept of Fourier space that is well known in imaging. In MR imaging the k-space is a temporary memory of the spatial frequency information in two or three dimensions of an object; the k-space is defined by the space covered by the phase and frequency encoding data.
The relation between K-space data and image data is the Fourier Transformation. The data acquisition matrix contains raw image data before the image processing. In 2 dimensional Fourier transformation imaging, a line of data corresponds to the digitized MRI signal at a particular phase encoding level. The position in k-space is directly related to the gradient across the object being imaged. By changing the gradient over time, the k-space data are sampled in a trajectory through Fourier space at each point until it is filled.

See also Spatial Frequency and Raw Data.
spacer

• View the DATABASE results for 'K-Space' (65).Open this link in a new window

 
Further Reading:
  Basics:
K-space formulation of MRI
Tuesday, 22 March 2005   by www.ebyte.it    
The Basics of MRI
   by www.cis.rit.edu    
  News & More:
Optimal k-Space Sampling for Dynamic Contrast-Enhanced MRI with an Application to MR Renography
Thursday, 5 November 2009   by www.ncbi.nlm.nih.gov    
K-Space Trajectory
 
The path traced in the spatial-frequency domain during data collection as determined by the applied gradients.
spacer

• View the DATABASE results for 'K-Space Trajectory' (4).Open this link in a new window

MRI Resources 
Mass Spectrometry - Functional MRI - Portals - Blood Flow Imaging - Movies - Sequences
 
Kelvin
 
(K) The SI unit of temperature.
Definition: One Kelvin is 1/273.16 of the difference between the triple point of water (at exactly 273.16 K) and absolute zero.
The triple point of water is the temperature at which water can exist simultaneously in the gaseous, liquid, and solid states. Absolute zero is the temperature at which all molecular motion discontinues.
0 K is according to -273,15° Celsius and -459° Fahrenheit.
spacer

• View the DATABASE results for 'Kelvin' (6).Open this link in a new window

KeyholeInfoSheet: - Sequences -
Intro, Overview, 
Types of, 
etc.
 
Keyhole imaging is used for dynamic imaging with contrast medium. The advantage is that the keyhole technique increases temporal resolution without a loss of spatial resolution by limited data acquisition. Keyhole Fourier imaging updates the low spatial frequencies of the original full, high-resolution data set. The high spatial frequency content of the image is constant in time so that its updating would be unnecessary. The high spatial frequency data is acquired from a baseline image, for example, before injection of a contrast agent.
After contrast injection, only the lower spatial frequency data is acquired because, there is no change in the tissue that is responsible for the higher frequency spatial variation in the image.
spacer

• View the NEWS results for 'Keyhole' (1).Open this link in a new window.

• View the DATABASE results for 'Keyhole' (8).Open this link in a new window

 
Further Reading:
  Basics:
Optimal k-Space Sampling for Dynamic Contrast-Enhanced MRI with an Application to MR Renography
Thursday, 5 November 2009   by www.ncbi.nlm.nih.gov    
Kilogram
 
(kg) The base SI unit of mass of the metric system.
Definition: 1 kilogram is defined as the mass of the standard kilogram, a platinum-iridium bar in the custody of the International Bureau of Weights and Measures (BIPM) near Paris, France.
A traditional unit of mass or weight is also the pound (in general use, e.g. in the United States and Great Britain), with the symbol lb (derived from the Latin word libra).
1 kg is 2.204627 pound (lb. av.)
1 pound (lb. av.) is 0.453 kg.
Smaller units are, e.g.
1 000 gram (g) are 1 kg
1 000 milligram (mg) are 1 g
1 000 microgram (μg) are 1 mg
spacer

• View the DATABASE results for 'Kilogram' (8).Open this link in a new window

MRI Resources 
Brain MRI - Pathology - Non-English - Mass Spectrometry - MRI Accidents - Intraoperative MRI
 
    1 - 5 (of 6)      next 
 K--Ki    Kn-Kn   
 Random Page
 
Share This Page
FacebookTwitterLinkedIn

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



Next big thing in MRI will be :
AI 
remote operator 
personalized protocols 
helium-free 
molecular MRI 
portable MRI 

Look
      Ups





MR-TIP.com uses cookies! By browsing MR-TIP.com, you agree to our use of cookies.

Magnetic Resonance - Technology Information Portal
Member of SoftWays' Medical Imaging Group - MR-TIP • Radiology-TIP • Medical-Ultrasound-Imaging • 
Copyright © 2003 - 2024 SoftWays. All rights reserved. [ 18 March 2024]
Terms of Use | Privacy Policy | Advertising
 [last update: 2024-02-26 03:41:00]