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Result : Searchterm 'Energy' found in 2 terms [] and 59 definitions []
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Surface CoilForum -
related threadsInfoSheet: - Coils - 
Intro, 
Overview, 
etc.MRI Resource Directory:
 - Coils -
 
A surface coil is essentially a loop of conducting material, such as copper tubing. The in-bore solenoidal sending coil is used as the transmitter of RF energy. This type of receiver coil is placed directly on or over the region of interest for increased magnetic sensitivity. The loop may form various shapes and be bent slightly to conform to the imaged body part. Surface coils have a good SNR for tissues adjacent to the coil and because the signal decrease with the distance, an eligibility homogeneity correction will equalize this over the field of view. A rule of thumb for surface coils is that the sensitivity decreases appreciably beyond a distance equal to the diameter of the coil.
The positioning of the coil is an important determinant of performance. As only the region close to the surface coil will contribute to the signal, there is an improvement in the SNR for these regions, compared to the use of receiver coils that surround the appropriate part of the body. These coils are specifically designed for localized body regions, and provide improved signal to noise ratios by limiting the spatial extent of the excitation or reception.

See also the related poll result: '3rd party coils are better than the original manufacturer coils'
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• Related Searches:
    • Parallel Imaging Technique
    • Receiver Coil
    • Antenna
    • Signal to Noise Ratio
    • Signal Intensity
 
Further Reading:
  Basics:
System Architecture
2003   by www.revisemri.com    
Searchterm 'Energy' was also found in the following services: 
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Radiology  (79) Open this link in a new windowUltrasound  (50) Open this link in a new window
T2 Weighted ImageInfoSheet: - Sequences - 
Intro, 
Overview, 
Types of, 
etc.
 
T2 weighted imaging relies upon local dephasing of spins following the application of the transverse energy pulse. The contrast of a T2 weighted image is predominantly dependent on T2 and the T2 dependence will be increased by using a long echo time.
Fat has a shorter T2 time than water and relaxes or decays more readily than water. Since the amount of transverse magnetization in fat is small, fat generates very little signal on a strong T2 weighted contrast image and appears intermediate to dark. The T2 weighting is stronger with a longer TE. Water has a very high T2 constant, therefore has very high T2 signal and thus appears bright on a T2 contrast image. Cerebral white matter (fat containing) is less intense than grey matter. Flowing blood (flow effects) and haematomas (haemoglobin, haemosiderin) have a variable signal intensity on MR images.
Images created with TR's and TE's to enhance T2 contrast are referred to as T2 weighted images. Both T1 and T2 weighted images are acquired for most medical MRI examinations.
 
Images, Movies, Sliders:
 Lumbar Spine T2 FSE Sagittal  Open this link in a new window
    

Courtesy of  Robert R. Edelman
 Shoulder Axial T2 FatSat FRFSE  Open this link in a new window
    

Courtesy of  Robert R. Edelman
 Lumbar Spine T2 FSE Axial  Open this link in a new window
 
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• View the DATABASE results for 'T2 Weighted Image' (5).Open this link in a new window

 
Further Reading:
  Basics:
MYELIN-SELECTIVE MRI: PULSE SEQUENCE DESIGN AND OPTIMIZATION
   by www.imaging.robarts.ca    
T2* cardiac MRI allows prediction of severe reperfusion injury after STEMI
Tuesday, 9 November 2010   by www.medwire-news.md    
  News & More:
Periodical assessment of four horns of knee meniscus using MR T2 mapping imaging in volunteers before and after amateur marathons
Friday, 15 July 2022   by www.nature.com    
New MRI technique offers faster diagnosis of multiple sclerosis
Monday, 1 February 2016   by medicalxpress.com    
MRI measurement tools to help diagnose veterans' traumatic brain injuries
Wednesday, 18 March 2015   by medicalxpress.com    
New MR sequence helps radiologists more accurately evaluate abnormalities of the uterus and ovaries
Thursday, 23 April 2009   by www.eurekalert.org    
MRI Resources 
Case Studies - Colonography - Education - Lung Imaging - Cardiovascular Imaging - Artifacts
 
Thermal Equilibrium
 
A state in which all parts of a system are at the same effective temperature, in particular where the relative alignment of the spins with the magnetic field is determined solely by the thermal energy of the system (in which case the relative numbers of spins with different alignments will be given by the Boltzmann distribution).
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• View the DATABASE results for 'Thermal Equilibrium' (3).Open this link in a new window

 
Further Reading:
  News & More:
Evaluation of Absorbed Dose by MRI Read-Out
Saturday, 18 November 2017   by www.jstage.jst.go.jp    
Searchterm 'Energy' was also found in the following services: 
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Transverse Magnetization
 
The xy component of the net magnetization vector at right angles to the main magnetic field. The precession of the transverse magnetization at the Larmor frequency is responsible for the detectable MRI signal. In the absence of externally applied RF energy, the transverse magnetization will decay to zero with a characteristic time constant of T2, or more strictly T2*.
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• View the DATABASE results for 'Transverse Magnetization' (43).Open this link in a new window

 
Further Reading:
  Basics:
Measuring T1 and T2 Relaxation - Introductory NMR & MRI from Magritek
   by www.azom.com    
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Radiology  (79) Open this link in a new windowUltrasound  (50) Open this link in a new window
Volt
 
(V) The SI unit of electric potential.
Definition: The amount of potential energy present per unit of charge. 1 volt representing a potential of 1 joule per coulomb of charge.
The unit is named for the Italian scientist Count Alessandro Volta.
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• View the DATABASE results for 'Volt' (17).Open this link in a new window

MRI Resources 
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