Intensifying screen | 合法醫療器材資訊網

Intensifyingscreensareusedinthex-raycassettetointensifytheeffect...base;reflectinglayer/absorptivelayer;phosphor:absorbsthex-rayphoton ...

Intensifying screens are used in the x-ray cassette[1] to intensify the effect of the x-ray photon by producing a larger number of light photons. It decreases the mAs[2] required to produce a particular density and hence decreases the patient dose significantly. It also reduces motion blur and x-ray tube loading by reducing exposure time. 

In cassettes, which use double emulsion film[3]s, two screens are used, mounted on both sides of the cassette. In mammography, however, a single screen on the back side and a single emulsion film is used.

The thickness of an intensifying screen is about 0.4 mm. The thickness of the screen affects the screen speed and spatial resolution: thicker screen improves speed but reduces spatial resolution (increased diffusion of light before image formation). 

The intensity factor is a measure of efficiency of intensifying s...