. A patient comes in describing hand pain and says that he injured his hand when

Question

. A patient comes in describing hand pain and says that he injured his hand when playing football. You decide to use screen-film radiography to take an x-ray of the hand, suspecting a hairline fracture.

Describe ideal x-ray setting including: intensifying-screen thickness, film speed, cathode filament size, and object-detector distance. Only use the words: large, small, fast, slow, close or far to express your decision with a couple words describing the consequences. Briefly summarize your overall logic by each decision (i.e., your motivation behind your selections).

Explanation / Answer

Screen thickness:

As screen thickness increases, image blur increases. Thin screens absorb a relatively small fraction of the x-ray photons; thicker screens absorb a greater fraction and thus require less x-radiation. So to see hair line fracture, Thinscreen will be preferred.

Film speed:

Screen's ability to produce density within a given exposure to x-ray, there are 3 major speed categories- a) high speed b) mediunm speed and c) slow speed. As speed decreases, fine detail of x-ray clarity and fineness increases. So in this case, slow speed will be preferred.

Cathode filament size:

X-ray tubes that have very small cathode filament sizes produce very high-resolution images typically below 50 µm in diameter. Therefore to see hair line fracture, small cathode flament size will be preferred.

Object-detector distance:

The object-detector distance is usually kept as small as possible to help minimize unsharpness. So in this case object-detector distance will be kept minimum to see hairline fracture clearly.

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