Geometric unsharpness: a. Occurs because X-ray photons are emitted fr

1.	Geometric unsharpness: a. Occurs because X-ray photons are emitted from an area of finite size rather than from a point sourceb. Increases with focal spot size c. Decreases with shortening of the object-to-film distance d. Increases with shortening of the focus-to-film distance e. Decreases towards the anode side of the image
Answer» a. True. b. True. The larger the focal spot size, the larger the penumbra (image blur around the edges of an object). c. True. The closer the object to the detector, the less unsharpness. d. True. The closer the focus to the film, the more geometric unsharpness. In summary, geometric unsharpness depends on the focal spot size (f ), object-to-film distance (h) and focus-to-film distance (FFD) and is given by the formula U_g = fh/(FFD – h). e. True. This is because the projected focal spot decreases in size towards the anode side.

Geometric unsharpness: a. Occurs because X-ray photons are emitted from an area of finite size rather than from a point sourceb. Increases with focal spot size c. Decreases with shortening of the object-to-film distance d. Increases with shortening of the focus-to-film distance e. Decreases towards the anode side of the image

Answer»

a. True.

b. True. The larger the focal spot size, the larger the penumbra (image blur around the edges of an object).

c. True. The closer the object to the detector, the less unsharpness.

d. True. The closer the focus to the film, the more geometric unsharpness. In summary, geometric unsharpness depends on the focal spot size (f ), object-to-film distance (h) and focus-to-film distance (FFD) and is given by the formula U_g = fh/(FFD – h).

e. True. This is because the projected focal spot decreases in size towards the anode side.

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