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#focal_spot#xray_tube
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X ray tube.
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X ray beam restrictor.
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Automatic processor.
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Bremsstrahlung radiation.
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Characteristics radiation.
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Production of x ray.
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Topic - focal spot (x- ray tube )
It is an area of the anode surface which receives a beam of electron from the cathode filament.
It depends on
1) filament coil ( dimension )
2 focusing cup ( dimention )
3) position of the filament in the focusing cup.
4) The electric field created between cathode and anode.
It influence -:
1) image sharpness-:
Image sharpness is inversely proportional to focal spot.
2) heat dissipation :-
Heat dissipation is directly proportional to focal spot.
Line focus principle "it is state that effective focal spot is always smaller than the actual focal Spot"
Anode angle -: it is defined as an angle of the target surface with respect to the central Ray in the X-ray field.
It influence -:
1) Effective focal spot-:
Effective focal spot is directly proportional to another angle.
2) anode heel effect-:
It state that the intensity of X-Ray beam is greater towards the cathode side in comparison to the anode side.
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