Improved visualization of stimulated nodules by adaptive enhancement of digital chest radiography

Academic Radiology
J H KimC W Lee

Abstract

Although digital radiography of the chest has a wide dynamic range, difficulties still remain in visualizing the acquired images faithfully on gray-scale displays (cathode-ray tube [CRT] displays), which have a much lower level of luminance than film view boxes. We propose an adaptive-enhancement algorithm for digital chest radiography that provides faithful visualization of the chest on the CRT. We investigated the contrast sensitivity of a CRT monitor and developed an image processing algorithm that compresses the dynamic range and enhances image contrast selectively in the mediastinal area and that transforms the gray scale to visualize the image by use of the full effective dynamic range of the CRT. We performed a receiver-operating characteristic (ROC) study by using simulated nodules to evaluate the clinical value of the proposed algorithm. The processed images provided improved visualization of both mediastinal and lung regions. The area under the ROC curve for retrocardiac or subdiaphragmatic nodule detection increased significantly (from 0.69 to 0.79; P < 0.05). The area under the ROC curve for lung nodule detection also increased (from 0.64 to 0.75; P < 0.1), although not to the level of statistical significance. The ...Continue Reading

References

Jul 1, 1992·Radiographics : a Review Publication of the Radiological Society of North America, Inc·S J DwyerG J Blaine
May 1, 1989·Radiology·R G FraserC R Merritt
Dec 1, 1985·Investigative Radiology·R H SherrierC E Ravin
Jul 1, 1982·Investigative Radiology·B BaxterR A Normann
Jan 1, 1987·IEEE Transactions on Medical Imaging·R H Sherrier, G A Johnson

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Citations

Sep 16, 2008·Clinical Orthopaedics and Related Research·Itamar Busheri BotserAharon Chechik

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