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

Out-
      side
 



 
 'Image Guidance' 
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
Result : Searchterm 'Image Guidance' found in 0 term [] and 54 definitions []
previous     31 - 35 (of 54)     next
Result Pages : [1 2 3 4 5 6 7 8 9 10 11]
Searchterm 'Image Guidance' was also found in the following service: 
spacer
News  (2)  
 
Partial Volume ArtifactInfoSheet: - Artifacts - 
Case Studies, 
Reduction Index, 
etc.MRI Resource Directory:
 - Artifacts -
 
Quick Overview
Artifact Information
NAME
Partial volume
DESCRIPTION
Loss of contrast between two adjacent tissues
REASON
Insufficient resolution
HELP
Thinner slices
The Partial Volume Artifact is caused by imaging voxel containing two different tissues and therefore possessing a signal average of both tissues.
mri safety guidance
Image Guidance
Take thinner slices (smaller voxel), but this may result in poorer signal to noise ratio in the image.

See Partial Volume Effect.
spacer
 
• Related Searches:
    • Spatial Resolution
    • Water Fat Shift
    • Multiple Overlapping Thin Slab (Slice) Acquisition
    • Partial Volume Averaging
    • Voxel
 
Further Reading:
  Basics:
MRI GLOSSARY
   by fonar.com    
MRI Resources 
Corporations - Shielding - Homepages - Universities - MRCP - Databases
 
Partial Volume EffectInfoSheet: - Artifacts - 
Case Studies, 
Reduction Index, 
etc.
 
The partial volume effect is the loss of contrast between two adjacent tissues in an image caused by insufficient resolution so that more than one tissue type occupies the same voxel (or pixel). That may induce a partial volume artifact, dependent on the size of the image voxel. If fat and water spins occupy the same voxel, their signals interfere destructively. A small amount of water signal may be eliminated by a larger lipid signal from the same voxel, resulting in a voxel that appears to contain only lipid. The partial volume effect is minimal with thin slice thickness and sufficiently high resolution, so that fat and water or other different structures are unlikely to occupy the same voxel.
mri safety guidance
Image Guidance
Take thinner slices, and higher resolution (smaller voxel), but remain this may result in poorer signal to noise ratio in the image.
spacer

• View the DATABASE results for 'Partial Volume Effect' (2).Open this link in a new window

MRI Resources 
Services and Supplies - Claustrophobia - Guidance - Image Quality - Musculoskeletal and Joint MRI - Raman Spectroscopy
 
Phase Encoded Motion ArtifactInfoSheet: - Artifacts - 
Case Studies, 
Reduction Index, 
etc.MRI Resource Directory:
 - Artifacts -
 
Quick Overview
Please note that there are different common names for this artifact.
Artifact Information
NAME
Phase encoded motion, motion, phase effect
DESCRIPTION
Blurring and ghosting
REASON
Movement of the imaged object
HELP
Compensation techniques, more averages, anti spasmodic, presaturation
This artifact is caused by movements of the patient or organic processes taking place in the body of the patient. The artifact appears as bright noise, repeating densities or ghosting in the phase encoding direction.
mri safety guidance
Image Guidance
There are different solutions for reduction of phase encoded motion artifacts.
Cardiac and respiratory gating, breath holding, sedation of the patient, presaturation pulses for flow artifacts (e.g. arterial pulsation, breathing), fast imaging sequences, etc.

See also Motion Artifact, Ghosting Artifact, Motion Compensation Pulse Sequences and Artifact Reduction - Motion.
spacer

• View the DATABASE results for 'Phase Encoded Motion Artifact' (5).Open this link in a new window

Searchterm 'Image Guidance' was also found in the following service: 
spacer
News  (2)  
 
PoleStar™InfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
www.odinmed.com/site/content/system/benefits.asp From Odin Medical Technologies, Inc.;
the PoleStar™ N-10 is a compact, mobile MRI scanner that mounts to a standard operating room table. The magnets raise into position for imaging, but lower to make surgery easier, and the low magnetic field makes it possible to use many conventional surgical instruments.
When not in use, the PoleStar™ is stored in a nearby closet that allows the room to be used for conventional surgical procedures. The PoleStar™ N-10 is supplied with a fully integrated image guidance system that utilizes intraoperatively acquired images.
The successor, the new PoleStar™ N20 sets a new standard in intraoperative magnetic resonance imaging.
Device Information and Specification
CLINICAL APPLICATION
Intraoperative
CONFIGURATION
Semi-portable open MRI
MAGNET WEIGHT
500 kg
H*W*D
97x139x110 cm
5-GAUSS FRINGE FIELD
1.5 m
spacer

• View the DATABASE results for 'PoleStar™' (2).Open this link in a new window

MRI Resources 
MRI Centers - MRI Training Courses - Knee MRI - Developers - Chemistry - Implant and Prosthesis
 
Quadrupole ArtifactInfoSheet: - Artifacts - 
Case Studies, 
Reduction Index, 
etc.MRI Resource Directory:
 - Artifacts -
 
Quick Overview
Artifact Information
NAME
Quadrupole artifact
DESCRIPTION
Signal loss, intensity variations
REASON
B1 disturbance
HELP
Fat suppression (SPIR or FatSat) is very critical to the magnetic field homogeneity. Eddy currents in the patient results in B1 disturbance from left to right and from anterior to posterior. The artifact is seen as signal intensity variations with SPIR, like a signal intensity loss diagonal in the image. The short T1 inversion recovery (STIR) sequence is due to another type of fat suppression insensitive to this artifact.
mri safety guidance
Image Guidance
spacer
MRI Resources 
Spectroscopy pool - Safety Products - Artifacts - Software - Jobs - Education pool
 
previous      31 - 35 (of 54)     next
Result Pages : [1 2 3 4 5 6 7 8 9 10 11]
 Random Page
 
Share This Page
FacebookTwitterLinkedIn

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



How AI will impact MRI :
only diagnostics 
saving time 
reducing cost 
makes planning obsolete 
reduce human knowledge 
not at all 

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. [ 28 March 2024]
Terms of Use | Privacy Policy | Advertising
 [last update: 2024-02-26 03:41:00]