heel effect

heel effect,

the x-ray intensity greater at the cathode end of the x-ray field and lower at the anode end because of absorption in the target material.

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effect,

n the result of an action.

effect, heel (anode heel effect),

n the variation of intensity over the cross section of a useful radiographic beam, caused by the angle at which radiographs emerge from beneath the surface of the focal spot, which causes a differential attenuation of photons composing the useful beam.

effect of external radiation on bone,

n See osteoradionecrosis.

effect of function on bone,

n See law, Wolff's.

effect, photoelectric,

n the process by which radiographic images are produced when the energy of an incident photon is absorbed as the result of bound electron ejection.

effect, wedging,

n an effect produced by food impaction that forces the teeth apart.

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heel

1. (rare) in cats and dogs, the hock joint or tarsus.

2. in ungulates, the place at the rear of the hoof or claw where horn and skin meet and where the wall of the hoof turns horizontally to become the sole.

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heel abscess

one of the forms taken by foot abscess in sheep. There is pain and swelling at the affected heel, and separation and discharge of pus occurs at the skin-horn junction. The abscess is caused by infection with Fusobacterium necrophorum and Arcanobacterium pyogenes, the infection resulting from an extension of the infection from an interdigital dermatitis.

heel bug

see trombiculaautumnalis.

heel bulb necrosis

see infectious bulbar necrosis.

contracted heel

the heels of the affected hoof are closer together than normal, the frog is narrow and shrunken and the bars form a narrower angle than in the normal hoof. The horse is usually lame on the leg.

heel easing

trimming the foot so that the heels can spread more.

heel effect

unequal distribution of the x-ray beam intensity emitted from the x-ray tube. Due to angulation of the target, the distribution of the beam intensity decreases rapidly towards the anode due to absorption of the x-ray beam by the target and anode material.

heel fly

see hypoderma.

sheared heel

vertical separation occurs between the heels of a horse's hoof causing lameness. A chronic condition due usually to overuse of one heel because of a conformational imbalance.