Where does the so-called "heel effect" distribute more radiation intensity?

The "heel effect" refers to the phenomenon in X-ray imaging where there is a variation in radiation intensity across the beam, with more intense radiation being emitted towards the cathode side. This occurs due to the geometry of the X-ray tube and the fact that X-rays must pass through more material on the anode side of the target, leading to a reduction in intensity for that area.

When considering the distribution of radiation intensity, the higher intensity is located on the cathode side of the image receptor. This means that when the image receptor is positioned to receive the X-rays, the area exposed by the cathode side will capture a stronger, more intense image. This concept is crucial because it affects how radiographs are produced and what adjustments might need to be made in positioning both the X-ray tube and the image receptor to ensure optimal image quality.

In contrast, the other options do not accurately reflect where the increased intensity occurs due to the heel effect. Understanding the heel effect is essential for making informed decisions in radiographic techniques and achieving the best possible image quality while minimizing patient exposure.