Line focus principle ( x- ray tube) l Radiography simplified l

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Anode heel effect
   • Anode heel effect ( x- ray tube) l Radiogr...  

Today I am posting vedio on.......
Line focus principle:-
Angling the face of the anode target, a large actual focal spot size can be maintained, and a small focal spot can be created.

-It gives relationship between actual and effective focal spot size..

The focal spot is the area of the target upon which the electron beam impinges. The energy of the electrons in the electron beam is mostly converted into heat......... and dissipated uniformly across the focal spot and anode surface.

The x-rays produced at the anode comprise less than one percent of the energy of the electrons in the electron beam.

" It state the relationship between actual focal spot and effective focal spot"

"The effective focal spot is smaller than the actual focus spot"

Focal spot is area where the electron strike the anode surface.

Line focus principle allows for a LARGER area for heating while maintaining a small focal spot
-achieved by angling the target

Effective focal spot-:
origin of the x ray beam
x-ray beam area as seen from the patients perspective
When specifying focal spot sizes, this is the focal spot that is being identified.

The smaller the area, the shaper the image.
For best image quality........keep this as SMALL as possible.

Typically between 6-20 degrees for a general purpose x-ray room.



Limitation--
There are two important aspects to consider with regards to target angle:size of the apparent focal spot
area covered by the x-ray beam
Anode heel effect.
caused by....
-line focus principle
-intensity of radiation on the cathode side of the x-ray field is greater than that on the anode side
.
Factors controls focal spot
1) filament length
2) target angle
3) charge on the focusing cup
4) depth of the filament in focusing cup
4) shape of focusing cup.
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