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Skin Depth
 
Time-dependent electromagnetic fields are significantly attenuated by conducting media (including the human body); the skin depth gives a measure of the average depth of penetration of the RF field. A high power frequency tunable RF source can be rapidly switched on and off. This produces a large RF field perpendicular to the magnetic field. This RF field is focused by the body coil. The RF source and coils must be tunable in both frequency and impedance to 'match the impedance' of the patient's body.
mri safety guidance
MRI Safety Guidance
The skin depth may be a limiting factor in MR imaging at very high frequencies (high magnetic fields). The skin depth also affects the Q of the coils.
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Further Reading:
  News & More:
Magnetic resonance-guided motorized transcranial ultrasound system for blood-brain barrier permeabilization along arbitrary trajectories in rodents
Thursday, 24 December 2015   by www.ncbi.nlm.nih.gov    
Skin PatchesMRI Resource Directory:
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Pharmaceutical products in transdermal skin patches may cause burns due to the absorption of RF energy.
mri safety guidance
MRI Safety Guidance
Such patches must be removed prior to MR examinations.
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MRI Resources 
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SlabForum -
there are related threads
 
Exited measurement volume for 3D imaging. Slices are defined by a second phase encoded axis, which divides the volume into partitions without a gap.
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• View the DATABASE results for 'Slab' (28).Open this link in a new window

Slew RateForum -
there are related threads
 
The gradient slew rate is the speed rate of ascent or descent of a gradient from zero to its maximum amplitude, either positive or negative. Which is the amplitude divided by the rise time in msec. Measured in mT/m/msec or T/m/sec. The shorter the rise time, the faster the gradients and therefore echo spacing. Gradients with a shorter echo spacing will have a better resolution and more slices per TR.
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• View the NEWS results for 'Slew Rate' (1).Open this link in a new window.

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

SliceForum -
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The term describing the planar region or the image slice selection region.
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• View the NEWS results for 'Slice' (2).Open this link in a new window.

• View the DATABASE results for 'Slice' (177).Open this link in a new window

 
Further Reading:
  Basics:
What MRI Sequences Produce the Highest Specific Absorption Rate (SAR), and Is There Something We Should Be Doing to Reduce the SAR During Standard Examinations?
Thursday, 16 April 2015   by www.ajronline.org    
MRI Resources 
Libraries - Diffusion Weighted Imaging - Colonography - Service and Support - Raman Spectroscopy - Knee MRI
 
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