ANODE HEEL EFFECT IN BACHELOR OF MEDICAL IMAGING

THE SLIDES COVERS THE BASIC OF ANODE HEEL EFFECT

1. REVIEW OF X-RAY TUBE 1

2. BIG CONCEPT Bring the attention of your audience over a key concept using icons or illustrations 2

3. W hat is a X-Ray Tube? 3

4. W hat is a X-Ray Tube? 4 Attracts electron

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6. FOCAL SPOT Area that is bombarded by electron stream Larger or smaller in size Is required to produce good radiographic detail 6

7. Line Focus Principal Large focal spot allows greater heat loading which doesn’t produce sharp image This dilemma is solved by the development of line focus principle 7

8. Concept During X-Ray Production Heat will be dissipated uniformly across the focal spot and anode surface Small focal spot is required to produce good radiographic image 8

9. Concept Thus, line focus principle plays a role in the angulation of anode surface resulting in decrease of focal spot size 9

10. ANODE HEEL EFFECT

11. DEFINITION & CAUSES Type of variation in x-ray intensity along the longitudinal axis . Photons formed deeper in anode must pass through the heels of anode Causes “That side” to lose intensity before reaching Object Or Image Receptor Anode Side : Less Intensity Cathode Side : More Intensity (FAT CAT ) “ The larger part should be toward the cathode side to smooth the uneven densities created by the anode heel effect” 11

12. ANODE HEEL EFFECT Done on shoulder and thighs . Photons formed deeper in anode must pass through the heels of anode Causes “That side” to lose intensity before reaching Object Or Image Receptor Anode Side : Less Intensity Cathode Side : More Intensity (FAT CAT ) “ The larger part should be toward the cathode side to smooth the uneven densities created by the anode heel effect” 12

13. ANODE HEEL EFFECT Most Noticeable Steep Bevel Large Focal Spot Short Source Image Distance Large Image Receptor size 13