DANB Radiation Health and Safety (RHS) Practice Exam

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What is the definition of penumbra in radiography?

  1. Magnification of an object

  2. Diverging xrays

  3. Distortion of the shape of an image

  4. Fuzzy outline of a radiographic image

The correct answer is: Fuzzy outline of a radiographic image

The definition of penumbra in radiography is best described as the fuzzy outline of a radiographic image. Penumbra arises due to the geometry of the x-ray beam and the inherent qualities of the imaging system. When x-rays travel from a point source, they spread out, creating a gradient around the edges of an object. This results in a soft, shaded edge rather than a sharp line, producing the characteristic blurry boundary known as the penumbra. Understanding penumbra is crucial for interpreting images accurately, as it can impact the perceived clarity and sharpness of the anatomy being examined.

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