Confronting our mistakes: A comprehensive evaluation of radiographic errors in digital chest radiography among adult population in a public sector hospital
Abstract:Objective: To find out the various types of radiographic errors in digital chest radiography and their effect on image quality leading to image rejection.
Material and Methods: This cross-sectional study was carried out in Radiology department of Pakistan Institute of Medical Sciences for a period of One month, September 2019. The study included 1560 digital Chest X-Rays, reaching the Picture Archive and Communication System (PACS), fulfilling the inclusion criteria. All these X-rays were analyzed by two… Show more
“…(5) where µx The average of x,µy The average of y, σx 2 The variance of x, σy 2 The variance of y σ XY The covariance of x and y, C1, C2 To keep a division with a weak denominator stable, use two variables.…”
Section: Image Performance Metricsmentioning
confidence: 99%
“…Besides, the environment's illumination is deficient, providing low light, uneven brightness, nighttime, backlight, shadowed background, etc. Because the accepted quality of these images must be improved for better analysis, interpretation, and explanation, lowlight image enhancement methods must be used to reveal the hidden information [2]. The main goal of lowlight enhancement techniques is to restore well-perceived images to a high enough quality that the majority of their essential information is given without causing unexpected artifacts.…”
Computed tomography (CT) is used to diagnose diseases and tumors. A special dye called contrast material is used in CT scans to assist emphasize the parts of the body being examined. Therefore, an enhancement technique to improve CT images' degradation is needed. This paper aims to present a method to enhance the quality of Ct-Scan images based on discrete wavelets transform and the Retinex algorithm. The proposed methods are based on the Retinex algorithm parameters or Dark Channel Prior algorithm parameters, according to the output image from preprocessing and discrete wavelets algorithm steps to increase the lightness degree of an image, remove possible noise from the image improve the contrast. The results of experiments of the enhanced image outputted from the Retinex model compared with one outputted from the Dark Channel Prior method. Hence, image quality based on the DCP method is a higher degree of enhanced rate and reasonable rate of noise removal-based enhancement measures, which were SI, MSE, IQI, SNR, and SNR, but was very attentive to the percentage values of IQI and SI. So the DCP with WT was recorded as the highest rate of enhancement.
Index Terms— Dark Channel Prior, Image quality assessment, Liver CT, Retinex model, Wavelet Transform.
“…(5) where µx The average of x,µy The average of y, σx 2 The variance of x, σy 2 The variance of y σ XY The covariance of x and y, C1, C2 To keep a division with a weak denominator stable, use two variables.…”
Section: Image Performance Metricsmentioning
confidence: 99%
“…Besides, the environment's illumination is deficient, providing low light, uneven brightness, nighttime, backlight, shadowed background, etc. Because the accepted quality of these images must be improved for better analysis, interpretation, and explanation, lowlight image enhancement methods must be used to reveal the hidden information [2]. The main goal of lowlight enhancement techniques is to restore well-perceived images to a high enough quality that the majority of their essential information is given without causing unexpected artifacts.…”
Computed tomography (CT) is used to diagnose diseases and tumors. A special dye called contrast material is used in CT scans to assist emphasize the parts of the body being examined. Therefore, an enhancement technique to improve CT images' degradation is needed. This paper aims to present a method to enhance the quality of Ct-Scan images based on discrete wavelets transform and the Retinex algorithm. The proposed methods are based on the Retinex algorithm parameters or Dark Channel Prior algorithm parameters, according to the output image from preprocessing and discrete wavelets algorithm steps to increase the lightness degree of an image, remove possible noise from the image improve the contrast. The results of experiments of the enhanced image outputted from the Retinex model compared with one outputted from the Dark Channel Prior method. Hence, image quality based on the DCP method is a higher degree of enhanced rate and reasonable rate of noise removal-based enhancement measures, which were SI, MSE, IQI, SNR, and SNR, but was very attentive to the percentage values of IQI and SI. So the DCP with WT was recorded as the highest rate of enhancement.
Index Terms— Dark Channel Prior, Image quality assessment, Liver CT, Retinex model, Wavelet Transform.
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