In general, an X-ray image amplifier with a large field of view is comparatively poor in resolution. It is, therefor, required to employ a small image amplifier (5 inches or 7 inches) in the studies of small objects, such as diagnosis of coronary arteries. In ordinary diagnosis, on the other hand, a large field of view is required and 9 inch or 11 inch image amplifiers are most commonly employed.
The dual fied X-ray image amplifier has been developed to be used in both of these cases.
This paper refers to the principle, construction, and perforemance of the Shimadzu Dual Field Image Amplifier.

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