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 27)     next 
H0-Ha     Ha-Ha   He-He   He-Hi   Hi-Hy   Hy-Hy   
MRI Resources 
Mobile MRI - Implant and Prosthesis - Stent - Spectroscopy pool - Implant and Prosthesis pool - Movies
 
H0
 
[H0] Conventional symbol historically used for the constant magnetic field in an MR system; it is physically more correct to use B0.
spacer

• View the DATABASE results for 'H0' (7).Open this link in a new window

H1
 
[H1] H1 is a conventional symbol historically used for the radio frequency magnetic field related to MRI; today B1 is in use.

See B1.
spacer

• View the DATABASE results for 'H1' (2).Open this link in a new window

 
Further Reading:
  News & More:
Nanometer-Scale Magnet Makes Tiny, Powerful MRI
Tuesday, 22 April 2014   by spectrum.ieee.org    
MRI Resources 
Lung Imaging - Universities - Spectroscopy - Colonography - Software - MR Myelography
 
HaemoglobinInfoSheet: - Contrast Agents - 
Intro, Overview, 
Characteristics, 
Types of, 
etc.
 
(Hb) Haemoglobin is the major endogenous oxygen-binding molecule, responsible for binding oxygen in the lung and transporting it to the tissues by means of the circulation. Haemoglobin is contained in very high concentration in the red blood cells.
Haemoglobin is an Fe chelate tightly binding one Fe ion in its II oxidation state where it carries the charge 2+ (ferrous iron). If an oxygen molecule is bound to Hb, Hb is called oxyhaemoglobin, if no oxygen molecule is bound it is called deoxyhaemoglobin. When haemoglobin is oxidized (i.e. in a haematoma), Fe2+ is transformed into Fe3+. The resulting haemoglobin is then called metoxyhaemoglobin (Hb Fe3+).
Deoxyhaemoglobin and metoxyhaemoglobin act as paramagnetic contrast agents in MR, while oxyhaemoglobin is diamagnetic. This partly explains the special appearance of an aging haematoma in MR imaging and is also the basic of the blood oxygenation level dependent contrast (BOLD) used in functional magnetic resonance imaging of the brain (fMRI).
spacer

• View the DATABASE results for 'Haemoglobin' (10).Open this link in a new window

 
Further Reading:
  Basics:
MRI's inside story
Thursday, 4 December 2003   by www.economist.com    
  News & More:
MRI effectively measures hemochromatosis iron burden
Saturday, 3 October 2015   by medicalxpress.com    
Iron overload: accuracy of in-phase and out-of-phase MRI as a quick method to evaluate liver iron load in haematological malignancies and chronic liver disease
Friday, 1 June 2012   by www.ncbi.nlm.nih.gov    
EVALUATION OF HUMAN STROKE BY MR IMAGING
2000
Haemorrhages
 
After a bleeding, blood goes through several transitions regarding magnetic properties, intra- and extracellular distribution and content of proteins and water. Oxyhaemoglobin is degraded to deoxyhaemoglobin and further to methaemoglobin, ferritin and haemosiderin. These molecules can be characterized by their magnetic susceptibility effect. Oxyhaemoglobin is diamagnetic with no practical influence on the magnetic field. All degradation products are paramagnetic (deoxyhaemoglobin, methaemoglobin) or even superparamagnetic (ferritin, haemosiderin).

See also Haemoglobin, Blood Oxygenation Level Dependent Contrast.
spacer

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

 
Further Reading:
  News & More:
Spinal bleeding with brain injury may suggest abuse in young children
Tuesday, 8 November 2011   by www.eurekalert.org    
MRI measurement tools to help diagnose veterans' traumatic brain injuries
Wednesday, 18 March 2015   by medicalxpress.com    
Hahn Echo
 
Production of spin echo by repeated RF pulses. First observed using equal (90°) RF pulses, now commonly used to describe refocusing of transverse magnetization by a 180° RF pulse. By choosing long echo delay times, the spins in a Hahn echo first dephase for a long time, then rephase, which makes the Hahn pulse sequence more susceptible to diffusion effects.
spacer

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

 
Further Reading:
  Basics:
Magnetic resonance imaging
   by www.scholarpedia.org    
MRI Resources 
Hospitals - Equipment - MR Guided Interventions - Resources - MRI Centers - Cochlear Implant
 
    1 - 5 (of 27)      next 
 H0-Ha    Ha-Ha   He-He   He-Hi   Hi-Hy   Hy-Hy   
 Random Page
 
Share This Page
FacebookTwitterLinkedIn

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



Personalized protocols (age, gender, body habitus, etc.) lead to :
more automated planning 
improved patient comfort 
better diagnostics 
optimized image quality 
nothing 

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]