<P> In X-ray tubes , the heel effect or more accurately , the anode heel effect is a variation of the intensity of X-rays emitted by the anode depending on the direction of emission . Due to the geometry of the anode , X-rays emitted towards the cathode are in general more intense than those emitted perpendicular to the cathode -- anode axis . The effect stems from the absorption of X-ray photons before they leave the anode in which they are produced . The probability of absorption depends on the distance the photons travel within the anode material , which in turn depends on the direction of emission . </P>
<P> In X-ray tubes , the heel effect or more accurately , the anode heel effect is a variation of the intensity of X-rays emitted by the anode depending on the direction of emission . Due to the geometry of the anode , X-rays emitted towards the cathode are in general more intense than those emitted perpendicular to the cathode -- anode axis . The effect stems from the absorption of X-ray photons before they leave the anode in which they are produced . The probability of absorption depends on the distance the photons travel within the anode material , which in turn depends on the direction of emission . </P>
the prominent heel effect in mammography is due to a
the prominent heel effect in mammography is due to a
absorption of X-ray photons before they leave the anode in which they are produced
absorption of X-ray photons before they leave the anode in which they are produced