Objective performance measurements versus perceived image quality in intensified fluoroscopic or photospot images.

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Abstract
The relationship between perceived image quality and measurable performance parameters of an intensified fluoroscopic image, viewed via a TV monitor or recorded on 105 mm film, was investigated. Four specially manufactured image tubes differing significantly in X-ray absorption efficiency, spatial resolution and/or contrast resolution were studied. Quantitative measurements of tube performance included the conversion factor, quantum detection efficiency, limiting resolution, contrast ratio and contrast-detail characteristics. The quality of the clinical images was assessed by 2 radiologists working independently and without knowledge of any quantitative results. They rated the noise, lag, resolution and contrast of the images during a variety of fluoroscopic procedures on each tube. Quantitative measurements were usually similar but the radiologists'' perceptions of image quality, noise and contrast performance of an intensifier had greater influence on the radiologists'' judgment of image quality than did resolution.

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