Week 4 Angles & Beam Centering 18

Week 4 Angles & Beam Centering 18 - Shape...

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Shape Distortion Shape distortion is the misrepresentation of the object compared to the image. Most shape distortion is the result of angulation of the tube or film. This can be beneficial.If we can move overlying anatomy or open disc spaces, shape distortion is good.
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Shape Distortion The ideal x-ray image would be to see the area of interest free of overlying structures. A cephalad tube angle is toward the head. A caudal tube angle is toward the feet. The direction and amount of angulation is determined by the angle of the area of interest.
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Tube Angle: Cephalad Tube angled toward head. Reduce SID one inch for every five degrees of tube angulation. Used to get angled body parts perpendicular to film.
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Cephalad Tube Angle The amount of tube angle is determined by adding the angle to 90 for erect radiographs. Anterior structures are on top of the image. Posterior structures are projected to the bottom of the image.
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This is an A-P Cervical Spine view. The tube angle is 15°
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This note was uploaded on 01/03/2012 for the course LC 232 taught by Professor Wilson during the Fall '08 term at Palmer Chiropractic.

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Week 4 Angles & Beam Centering 18 - Shape...

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