Unsharp masking of low-dosed digital luminiscence radiographs: results of a receiver operating characteristics analysis

Müller, R.-D.; Voss, Michael; Hirche, H.; Buddenbrock, B.; John, V.; Bosch, E.

doi:10.1007/bf00182488

Cited by 3 publications

(1 citation statement)

References 20 publications

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“…Five additional postprocessed images obtained with Gaussian filtering [18] and different combinations of kernel value "S" and weighting factor "k" were also evaluated (Table 1). The actual parameters utilized were chosen based on the results of detail-detection studies using an anthropomorphic phantom of the chest [21].…”

Section: Methodsmentioning

confidence: 99%

Detection of radiographic findings in lung fibrosis using storage phosphor plates

et al. 1997

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The aim of this work was to examine the influence of the filter kernel size on the detectability of differing radiological findings in interstitial lung disease. In 97 patients with confirmed pulmonary fibrosis chest radiographs were obtained with a filmscreen system of speed class 200 and with correspondingly exposed storage phosphorous plates. The size of the filter kernel used for the image postprocessing varied between sigma 5 and sigma 70. The detectability of interstitial lung changes was evaluated independently by eight readers on the basis of a defined rating system. The results were analysed using multifactorial analysis of variance with Scheffé test at a significance level of p = 0.05. Small kernel sizes (S 5, S 10) combined with high edge enhancement were only of benefit in the imaging of septal lines, but reduced the detectability of nodular and reticular structures. Good detail detectability of both micronodules and septal lines was obtained with a medium kernel size of sigma 40. Storage phosphor radiography utilizing the appropriate choice of postprocessing parameters provides equivalent image quality for evaluating interstitial lung changes compared with a modern filmscreen technique.

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Section: Methodsmentioning

confidence: 99%

Detection of radiographic findings in lung fibrosis using storage phosphor plates

et al. 1997

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Roc-Analysisc of Detection Performance by Analogue and Digital Plain Film Systems in Chest Radiography

et al. 1996

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Quantitative assessment of image quality enhancement due to unsharp-mask processing in x-ray fluoroscopy

Jabri

Wilson

2002

J. Opt. Soc. Am. A

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Spatial unsharp-mask processing and its variants are commonly used in x-ray radiography to enhance image contrast. We investigated the effect of three unsharp-masking filter kernels of different sizes on the detection of an advanced guidewire tip in simulated x-ray fluoroscopy image sequences. To isolate the effect of visual temporal processing, we repeated the experiments on single images. Filter gains were selected so that all three kernels increased the contrast of a 0.018-in. (0.457-mm) guidewire by a factor of 2 but had different effects on image noise and signal profiles. There was no statistically significant effect of unsharp masking on human-observer performance in single images. However, all three kernels significantly improved average performance in image sequences, and the guidewire contrast required for detection was reduced by 32%-40%. A prewhitening channelized observer model predicted the disparity between sequences and single images and fitted measurements at different kernel sizes well. A nonprewhitening observer model did not. We conclude that unsharp masking is a simple and effective method of improving guidewire visualization in fluoroscopically guided interventional procedures and that quantitative image quality studies are essential for evaluation of image-processing techniques in sequences such as x-ray fluoroscopy.

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Unsharp masking of low-dosed digital luminiscence radiographs: results of a receiver operating characteristics analysis

Cited by 3 publications

References 20 publications

Detection of radiographic findings in lung fibrosis using storage phosphor plates

Detection of radiographic findings in lung fibrosis using storage phosphor plates

Roc-Analysisc of Detection Performance by Analogue and Digital Plain Film Systems in Chest Radiography

Quantitative assessment of image quality enhancement due to unsharp-mask processing in x-ray fluoroscopy

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