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PubMed · 948580

Less radiation, better images.

P Vijlbrief
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Abstract

It is explained in this paper that the use of fast film-screen combinations, despite their greater intrinsic unsharpness, can lead to much better image quality in the case of involuntary movements of the organs to be visualized. It is also demonstrated that in such cases the use of a large focus with high ratings can be preferable. Also discussed is the possible value of the modern intensifying screens, in which compounds of the group of the so-called 'rare earths' are contained in the luminescent layer.

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P Vijlbrief. 1976. Less radiation, better images.. https://pubmed.ncbi.nlm.nih.gov/948580/

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PubMed2005

Performance comparison of an active matrix flat panel imager, computed radiography system, and a screen-film system at four standard radiation qualities.

Four standard radiation qualities (from RQA 3 to RQA 9) were used to compare the imaging performance of a computed radiography (CR) system (general purpose and high resolution phosphor plates of a Kodak CR 9000 system), a selenium-based direct flat panel detector (Kodak Direct View DR 9000), and a conventional screen-film system (Kodak T-MAT L/RA film with a 3M Trimax Regular screen of speed 400) in conventional radiography. Reference exposure levels were chosen according to the manufacturer's recommendations to be representative of clinical practice (exposure index of 1700 for digital systems and a film optical density of 1.4). With the exception of the RQA 3 beam quality, the exposure levels needed to produce a mean digital signal of 1700 were higher than those needed to obtain a mean film optical density of 1.4. In spite of intense developments in the field of digital detectors, screen-film systems are still very efficient detectors for most of the beam qualities used in radiology. An important outcome of this study is the behavior of the detective quantum efficiency of the digital radiography (DR) system as a function of beam energy. The practice of users to increase beam energy when switching from a screen-film system to a CR system, in order to improve the compromise between patient dose and image quality, might not be appropriate when switching from screen-film to selenium-based DR systems.

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