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Result : Searchterm 'Magnetic Resonance Imaging' found in 5 terms [] and 64 definitions []
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T1 TimeForum -
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The T1 relaxation time (also called spin lattice or longitudinal relaxation time), is a biological parameter that is used in MRIs to distinguish between tissue types. This tissue-specific time constant for protons, is a measure of the time taken to realign with the external magnetic field. The T1 constant will indicate how quickly the spinning nuclei will emit their absorbed RF into the surrounding tissue.
As the high-energy nuclei relax and realign, they emit energy which is recorded to provide information about their environment. The realignment with the magnetic field is termed longitudinal relaxation and the time in milliseconds required for a certain percentage of the tissue nuclei to realign is termed 'Time 1' or T1. Starting from zero magnetization in the z direction, the z magnetization will grow after excitation from zero to a value of about 63% of its final value in a time of T1. This is the basic of T1 weighted images.
The T1 time is a contrast determining tissue parameter. Due to the slow molecular motion of fat nuclei, longitudinal relaxation occurs rather rapidly and longitudinal magnetization is regained quickly. The net magnetic vector realigns with B0 leading to a short T1 time for fat.
Water is not as efficient as fat in T1 recovery due to the high mobility of the water molecules. Water nuclei do not give up their energy to the lattice (surrounding tissue) as quickly as fat, and therefore take longer to regain longitudinal magnetization, resulting in a long T1 time.

See also T1 Weighted Image, T1 Relaxation, T2 Weighted Image, and Magnetic Resonance Imaging MRI.
 
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• Related Searches:
    • T1 Relaxation
    • Spin Echo Sequence
    • Paramagnetic Substance
    • Gadolinium
    • Relaxation Effect
 
Further Reading:
  Basics:
IMAGE CONTRAST IN MRI(.pdf)
   by www.assaftal.com    
A practical guideline for T1 reconstruction from various flip angles in MRI
Saturday, 1 October 2016   by journals.sagepub.com    
Magnetic resonance imaging - From Wikipedia, the free encyclopedia.
   by en.wikipedia.org    
  News & More:
New technique could allow for safer, more accurate heart scans
Thursday, 10 December 2015   by www.gizmag.com    
Rockland Technimed: Tissue Viability Imaging
Saturday, 15 December 2007   by www.onemedplace.com    
MRI Resources 
Intraoperative MRI - Abdominal Imaging - Process Analysis - Research Labs - MRI Accidents - Used and Refurbished MRI Equipment
 
T2 TimeForum -
related threads
 
The T2 relaxation time (spin spin relaxation time or transverse relaxation time), is a biological parameter that is used in MRIs to distinguish between tissue types and is termed 'Time 2' or T2. It is a tissue-specific time constant for protons and is dependent on the exchanging of energy with near by nuclei. T2 weighted images rely upon local dephasing of spins following the application of the transverse energy pulse. T2 is the decay of magnetization perpendicular to the main magnetic field (in an ideal homogeneous field).
Due to interaction between the spins, they lose their phase coherence, which results in a loss of transverse magnetization and MRI signal. After time T2 transverse magnetization has lost 63% of its original value. This tissue parameter determines the contrast.
The T2 relaxation is temperature dependent. At a lower temperature molecular motion is reduced and the decay times are reduced.
Fat has a very efficient energy exchange and therefore it has a relatively short T2.
Water is less efficient than fat in the exchange of energy, and therefore it has a long T2 time.

See also T2 Weighted Image and Magnetic Resonance Imaging MRI.
 
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Further Reading:
  News & More:
MYELIN-SELECTIVE MRI: PULSE SEQUENCE DESIGN AND OPTIMIZATION
   by www.imaging.robarts.ca    
MRI Resources 
MRA - Shielding - Safety Products - Libraries - Jobs - Brain MRI
 
Tomographic Imaging
 
Tomography is imaging by sections or sectioning. A device used in tomography is called a tomograph, while the image produced is a tomogram. The mathematical basis for tomographic imaging was laid down by Johann Radon. It is applied in computed tomography and magnetic resonance tomography (MRT) also called magnetic resonance imaging (MRI) to obtain cross-sectional images of slices through the body of patients. Each of that slices is defined by thickness and spatial resolution (see voxel).
 
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Further Reading:
  Basics:
Tomographic Image Reconstruction
   by www.aapm.org    
Image Characteristics and Quality
   by www.sprawls.org    
Magnetic Resonance Imaging, History & Introduction
2000   by www.cis.rit.edu    
  News & More:
Magnetic resonance imaging
   by www.scholarpedia.org    
PET/CT Combination Can Highly Increase Detection Of Colorectal Cancer
Monday, 29 October 2007   by www.sciencedaily.com    
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Voxel
 
A voxel is a volume element (volumetric and pixel) representing a value in the three dimensional space, corresponding to a pixel for a given slice thickness. Voxels are frequently used in the visualization and analysis of medical data. The Magnetic Resonance Imaging MRI pixel intensity is proportional to the signal intensity of the appropriate voxel.

See also Volumetric Imaging.
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• View the DATABASE results for 'Voxel' (35).Open this link in a new window

 
Further Reading:
  Basics:
Magnetic Resonance Imaging, History & Introduction
2000   by www.cis.rit.edu    
Voxel-based structural magnetic resonance imaging (MRI) study of patients with early onset schizophrenia
Monday, 22 December 2008   by 7thspace.com    
  News & More:
Quantity, not just quality, in new Stanford brain scan method
Monday, 4 November 2013   by news.stanford.edu    
MRI Resources 
Contrast Enhanced MRI - Safety Training - Functional MRI - Implant and Prosthesis pool - Brain MRI - Education pool
 
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