Off-focus radiation is best described as due to: A) Mutual repulsion of electrons that causes spreading of the electron beam B) Production of secondary electrons from the anode that increase the effective focal spot X-rays produced at a large angle and that don't exit the X-ray tube window D) Defocusing of electrons by the cathode focusing cup E) The space charge effect at low voltage and high currents the Heel Effect and 4. Fill the blanks: Increasing the anode angle _the apparent source size. A) Decreases; Has no effect on B) Increases; Increases Decreases; Increases D) Increases; Decreases E) Decreases; Decreases

Off-focus radiation is best described as due to: A) Mutual repulsion of electrons that causes spreading of the electron beam B) Production of secondary electrons from the anode that increase the effective focal spot X-rays produced at a large angle and that don't exit the X-ray tube window D) Defocusing of electrons by the cathode focusing cup E) The space charge effect at low voltage and high currents the Heel Effect and 4. Fill the blanks: Increasing the anode angle _the apparent source size. A) Decreases; Has no effect on B) Increases; Increases Decreases; Increases D) Increases; Decreases E) Decreases; Decreases