The presence of metallic sources, such as dental implants, orthodontic braces and metallic dental crowns may reduce the image quality of MRI in the maxillofacial region causing large magnetic field distortion
and signal loss.
The new corrector is spec'd with a slightly smaller 44-mm-diameter imaging circle covering 5.9[degrees], rather than the original's 48-mm, but it offers tighter star images and less field distortion
. To check it out, we borrowed the [epsilon]-130D from Texas Nautical Repair, Takahashi's exclusive North American distributor.
Beyond the convenience offered by the continuous measurement of line offset and depth from an arbitrary point in the field, the method effectively deals with field distortion
, one of the biggest problems of conventional electromagnetic line location.
Yet the most challenging environment for electronic compasses is transitory magnetic field distortion
encountered in everyday situations.
Anyone who has ever subscribed to cable television but not to adult film channels has seen the field distortion
screens that block clear transmissions of those adult movies.
The imaged star magnitude is slightly less compared to obtained from the first apparatus, and there is a large field distortion
due to eyepiece projection.
Receptors scattered over the fish's body pick up the field distortion
The field distortion
caused by the additional port coupling element obviously has only a negligible effect.
Since only field distortion
is being measured, the residual field effect of jigs and fixtures can be ignored.
Such a disagreement is determined by the field distortion
and by the assumptions of modeling.
Sudden changes in the pipe diameter, either upstream or downstream of a meter, may also introduce flow field distortion
. Branch flows, such as those produced by meter station headers, control valves, regulators and other flow restrictions or expansions, can also create distortions in the flow.
In our case, fluorophores occupy only a fraction of the surface area; therefore, care has to be taken to correct for optical field distortion
near the particle surface.