Comparison of Color LCD and Medical-grade Monochrome LCD Displays in Diagnostic Radiology (original) (raw)
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La Radiologia medica, 2018
To evaluate the effects of display pixel pitch and maximum luminance on intra- and inter-observer reproducibility and observer performance when evaluating chest lesions and bone fractures. This was a multi-institutional study for a retrospective interpretation of selected digital radiography images. Overall, 82 images were selected by senior radiologists, including 50 cases of chest lesions and 32 cases of bone fractures. These images were displayed at two pixel pitches (0.212 and 0.165 mm size pixels) and two maximum luminance values (250 and 500 cd/m) and reviewed twice by senior and junior radiologists. All the observers had to indicate the likelihood of the presence of the lesions and to rate the relative confidence of their assessment. Cohen Kappa statistic was computed to estimate the reproducibility in correctly identifying lesions; for multi-reader-multi-case (MRMC) analysis, weighted Jackknife Alternative Free-response Receiver Operating Characteristic (wJAFROC) statistical...
Australasian Physics & Engineering Sciences in Medicine, 2007
A study to compare performance of the following display monitors for application as PACS CR diagnostic workstations is described. 1. Diagnostic quality, 3 Mega Pixel, 21 inch monochrome LCD monitors -Planar C3i. 2. Clinical review quality, 2 Mega Pixel, 21 inch colour LCD monitors -Planar PX212. Two sets of seventy radiological studies were presented to four senior radiologists on two occasions, using different displays on each occasion. The clinical condition used for this investigation was to query for the presence of a solitary pulmonary nodule. Receiver Operating Characteristic (ROC) curves were constructed for diagnostic performance for each presentation. Areas under the ROC curves (AUC) for diagnosis using different monitors were compared and the following results obtained: Monochrome AUC = 0.813 +/-0.02, Colour AUC = 0.801 +/-0.021. These results indicate that there is no statistically significant difference in the performance of these monitor types at a 95% confidence level.
Medical Imaging Displays and Their Use in Image Interpretation
RadioGraphics, 2013
The adequate and repeatable performance of the image display system is a key element of information technology platforms in a modern radiology department. However, despite the wide availability of high-end computing platforms and advanced color and gray-scale monitors, the quality and properties of the final displayed medical image may often be inadequate for diagnostic purposes if the displays are not configured and maintained properly. In this article-an expanded version of the Radiological Society of North America educational module "Image Display"-the authors discuss fundamentals of image display hardware, quality control and quality assurance processes for optimal image interpretation settings, and parameters of the viewing environment that influence reader performance. Radiologists, medical physicists, and other allied professionals should strive to understand the role of display technology and proper usage for a quality radiology practice. The display settings and display quality control and quality assurance processes described in this article can help ensure high standards of perceived image quality and image interpretation accuracy. Abbreviations: AAPM = American Association of Physicists in Medicine, ACR = American College of Radiology, CCFL = cold-cathode fluorescent lamp, COTS = commercial off-the-shelf, DDL = digital driving level, DICOM = Digital Imaging and Communications in Medicine, GSDF = gray-scale standard display function, HVS = human visual system, JND = just noticeable difference, LCD = liquid crystal display, LED = light-emitting diode, PACS = picture archiving and communication system, SIIM = Society for Imaging Informatics in Medicine, SOS = satisfaction of search, TG18 = Task Group 18 RadioGraphics 2013; 33:275-290 • Published online 10.1148/rg.331125096 • Content Codes:
PLoS ONE, 2012
Workstations and electronic display devices in a picture archiving and communication system (PACS) provide a convenient and efficient platform for medical diagnosis. The performance of display devices has to be verified to ensure that image quality is not degraded. In this study, we designed a set of randomized object test patterns (ROTPs) consisting of randomly located spheres with various image characteristics to evaluate the performance of a 2.5 mega-pixel (MP) commercial color LCD and a 3 MP diagnostic monochrome LCD in several aspects, including the contrast, resolution, point spread effect, and noise. The ROTPs were then merged into 120 abdominal CT images. Five radiologists were invited to review the CT images, and receiver operating characteristic (ROC) analysis was carried out using a five-point rating scale. In the high background patterns of ROTPs, the sensitivity performance was comparable between both monitors in terms of contrast and resolution, whereas, in the low background patterns, the performance of the commercial color LCD was significantly poorer than that of the diagnostic monochrome LCD in all aspects. The average area under the ROC curve (AUC) for reviewing abdominal CT images was 0.71760.0200 and 0.74060.0195 for the color monitor and the diagnostic monitor, respectively. The observation time (OT) was 145627.6 min and 127619.3 min, respectively. No significant differences appeared in AUC (p = 0.265) and OT (p = 0.07). The overall results indicate that ROTPs can be implemented as a quality control tool to evaluate the intrinsic characteristics of display devices. Although there is still a gap in technology between different types of LCDs, commercial color LCDs could replace diagnostic monochrome LCDs as a platform for reviewing abdominal CT images after monitor calibration.
Telemedicine journal and e-health : the official journal of the American Telemedicine Association, 2014
Introduction: In teleradiology services and in hospitals, the extensive use of visualization displays requires affordable devices. The purpose of this study was to compare three differently priced displays (a medicalgrade grayscale display and two consumer-grade color displays) for image visualization of digitized chest X-rays. Materials and Methods: The evaluated conditions were interstitial opacities, pneumothorax, and nodules using computed tomography as the gold standard. The comparison was accomplished in terms of receiver operating characteristic (ROC) curves, the diagnostic power measured as the area under ROC curves, accuracy in conditions classification, and main factors affecting accuracy, in a factorial study with 76 cases and six radiologists. Results: The ROC curves for all of the displays and pathologies had similar shapes and no differences in diagnostic power. The proportion of cases correctly classified for each display was greater than 71.9%. The correctness proportions of the three displays were different (p < 0.05) only for interstitial opacities. The evaluation of the main factors affecting these proportions revealed that the display factor was not significant for either nodule size or pneumothorax size (p > 0.05). Conclusions: Although the image quality variables showed differences in the radiologists' perceptions of the image quality of the three displays, significant differences in the accuracy did not occur. The main effect on the variability of the proportions of correctly classified cases did not come from the display factor. This study confirms previous findings that medical-grade displays could be replaced by consumergrade color displays with the same image quality.
AJR. American journal of roentgenology, 2014
M e d ic a l Phy s ic s a n d I n f o r m a t ic s • O r ig i n a l R e s e a rc h I n radiology departments in which digital images are distributed, different types of displays are used, particularly medicalgrade gray-scale displays. In the past, cathode-ray tube (CRT) displays were often used. However, studies showed that the diagnostic accuracy achieved with LCD medicalgrade gray-scale displays [1] was the same as that achieved with CRT medical-grade grayscale displays. Consequently, CRT medicalgrade gray-scale displays were replaced by new LCD medical-grade gray-scale displays. Other research findings showed that 3-megapixel (MP) LCD medical-grade grayscale displays were equivalent to 5-MP LCD medical-grade gray-scale displays. Studies also have been conducted to evaluate the possibility of using color LCD medical-or consumer-grade displays instead of medicalgrade gray-scale displays . In those studies, which were performed with patterns or clinical conditions, no differences be-OBJECTIVE. The purpose of this study was to compare the diagnostic accuracy achieved with and without the calibration method established by the DICOM standard in both medicalgrade gray-scale displays and consumer-grade color displays.
Color and contrast perception in monochrome medical imaging flat-panel displays
Medical Imaging 2001: Image Perception and Performance, 2001
The interpretation of diagnostic grayscale images by human beings relies on luminance discrimination at photopic levels. The observer in his search for abnormality relies on luminance modulation. If this hypothesis is valid, then the color of a monochrome presentation should not affect diagnostic performance when the image luminance is equivalent to grayscale levels. Does observer preference for a particular tint influence his performance defining an ideally colored grayscale? In this paper, we studied the variations in supra-threshold contrast perception when using different colored scales to display psychophysics targets on uniform background. We used targets with six different colored scales based upon the hue and saturation levels, while maintaining a constant luminosity. The six colored scales and the "white" grayscale constituted our set of seven colored scales used in a two-alternative forced choice scheme with random presentation and eighteen observers. All image targets contained the same degree of physical contrast and the same luminance values. We computed the degree of preference for all possible combinations of two colored scales. In spite of large inter-observer variability, we found that green and blue scales result in higher perceived contrast.
Influence of Display Characteristics on Clinical Performance in Digital Pathology
Diagnostic Pathology, 2016
Introduction/ Background Digital Pathology adoption is increasing rapidly. Recent technological advances have resulted in a steep increase in the performance and quality of digital pathology systems. Quality assurance mechanisms are being developed to ensure consistent quality of scanned slide images. However one important component that surprisingly is often overlooked is the display system. Pathologists base their diagnosis on the images presented by the display. The quality of these digital images depends on all of the components in the imaging chain, including the display itself. Even a perfectly scanned high quality image will not be useful if it is visualized on a low quality display. Aims The goal of this paper is to study important display characteristics and to determine what their effect is on percent correct diagnosis, reading time, diagnostic confidence and inter-pathologist-agreement. Furthermore a recommendation will be provided for minimum requirements of a digital pa...
Evaluation of Performance of different display systems used in Nuclear Medicine Imaging
2015
Display is a key component of medical imaging systems as it serves as the final element of the imaging chain. A proper understanding of the display system of an imaging unit is very essential in order to fully utilize its diagnostic capability. Observer's visual response to the display plays a vital role in the final outcome of the imaging procedure. In this study we made an attempt to evaluate the performance of various different display systems used in the nuclear medicine imaging. The method of constant stimuli was used for measuring the response of observers. The concentration ratios have been determined for i) Display records on transparent film ii) Display records on computer screen (chromatic) iii) Photographic color display records. A background intensity that is commonly encountered in routine imaging was used for the study. A cylindrical phantom, 25 cm in diameter and 21 cm in height, was filled with Tc 99m and sufficient time was allowed for the uniform distribution o...