Medical Ultrasound Imaging
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Orientation
If available, some graphic aids can be helpful to show image orientations.
1) A graphic icon of the labeled primary axes (A, L, H) with relative lengths given by direction sines and orientation as if viewed from the normal to the image plane can help orient the viewer, both to identify image plane orientation and to indicate possible in plane rotation.
2) Ingraphic prescription of obliques from other images, a sample original image with an overlaid line or set of lines indicating the intersection of the original and oblique image planes can help orient the viewer.

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The 6 basic scanning surfaces are:
anterior, posterior, right, left, superior and inferior.
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The basic anatomical directions are:
right(R) to left (L), posterior (P) to anterior (A), and feet (F) to head (H).
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The basic orientation are:
transverse, coronal, sagittal.

In all cases the scanning surface is assigned to the top of the image. The orientation of single oblique slices can be specified by rotating a slice in one of the basic orientations toward one of the other two basic orthogonal planes about an axis defined by the intersection of the 2 planes.

See also Histogram.
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