Psychophysical evaluation of calibration curve for diagnostic LCD monitor

Uemura, Masanobu; Asai, Yoshiyuki; Yamaguchi, Michihiro; Fujita, Hideki; Shintani, Yuuko; Sanada, Shigeru

doi:10.1007/s11604-006-0085-3

Cited by 8 publications

(3 citation statements)

References 15 publications

(10 reference statements)

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“…Therefore, the initial image is no longer relevant. Other studies have concluded that CIE calibration is a better calibration method, 25 but we were interested in the GSDF of DICOM because DICOM is the gold standard in radiology. In this study, the DICOM calibration was achieved using LUTs incorporated into the viewing software, which produce quantization errors.…”

Section: Resultsmentioning

confidence: 99%

Effects of the DICOM grayscale standard display function on the accuracy of medical-grade grayscale and consumer-grade color displays for telemammography screening

Salazar

Romero²,

Bernal

et al. 2013

SPIE Proceedings

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The aim of this study was to compare the diagnostic accuracy of consumer-grade and medical-grade monitors with very different costs for breast cancer detection when used with and without the Digital Imaging and Communication in Medicine (DICOM) standard calibration. This study was retrospective, with a factorial design and repeated measures, and used 70 digital mammograms (40 benign or normal cases and 30 malignant cases), four radiologists, and three displays with and without display calibration. Film mammograms were included. The readings were classified according to the Breast Imaging Reporting and Data System. One medical-grade grayscale display and two consumer-grade displays were compared. Receiver operating characteristic curves were plotted for nodules, micro calcifications, and the degree of malignancy. The diagnostic accuracy of each device was calculated as the area under the curve, and the accuracy was compared using an analysis of variance. INTRODUCTIONBreast cancer is globally one of the most prevalent diseases among women over 50 years of age and presents the highest rate of cancer mortality in women in almost all countries. To detect this disease in its early stages, screening programs have been developed that include, among other methods, routine annual or biannual mammograms. 1-3 Screening mammography has shown effectiveness in reducing mortality, which is between 9% and 32% in women aged 40 years or older. 4, 5 Telemammography may be a solution to expand the screening coverage in a timely and efficient manner in vulnerable populations. This screening technique requires the use of digital images, but the cost of specialized equipment to generate, digitize and view digital mammograms is very high, resulting in the need for a low-cost alternative in developing countries. Before consumer-grade devices are adopted in the medical field, their diagnostic accuracy should be determined.Radiography is performed by different methods, including conventional X-ray radiography (RX) on film, computed radiography (CR), and direct digital imaging (DDI). Mammography is a special radiography technique for examining the breast, which has evolved rapidly in recent years with the following acquisition modifications: screen-film acquisition and reading in a light box, film digitization, 6 digital CR imaging, and more recently, full-field digital mammography (FFDM). Digital visualization has evolved with specialized 5-megapixel (MP) cathode-ray tube (CRT) monitors 7, 8 and specialized 5-MP liquid crystal display (LCD) monitors 9, 10 A recent study found no statistically significant differences in diagnostic accuracy for detecting nodules and calcifications between a 5-MP and a 3-MP specialized LCD medicalgrade monitor. 11 Emerging technologies are displacing existing ones, and the standards are changing. Currently, CR and FFDM with readings on specialized 5-MP LCD monitors is the standard clinical practice in mammography. LED monitors are replacing LCD monitors, and it is likely that the standard will further change. ...

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Section: Resultsmentioning

confidence: 99%

Effects of the DICOM grayscale standard display function on the accuracy of medical-grade grayscale and consumer-grade color displays for telemammography screening

Salazar

Romero²,

Bernal

et al. 2013

SPIE Proceedings

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“…We must investigate the optimal viewing size for detecting n-GGOs from the viewpoint of the human visual system in the future. Third, other factors were not evaluated such as the display luminance and display function, which also influence observer performance [20][21][22][23]; however, GSDF is recommended as a standard display function for soft-copy diagnosis [24]. Fourth, we did not use a low-dose protocol for lung cancer CT screening.…”

Section: Discussionmentioning

confidence: 99%

Investigation of optimal viewing size for detecting nodular ground-glass opacity on high-resolution computed tomography with cine-mode display

Yamaguchi

Bessho

Inoue

et al. 2010

Radiol Phys Technol

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We evaluated the effect of the displayed image sizes on observers' ability to detect nodular ground-glass opacity (n-GGO) on CT and investigated the optimal viewing size for soft-copy reading at CT screening for lung cancer. A total of 46 patients' high-resolution computed tomography (HRCT) images (22 patients with one GGO; 24 without GGO) were displayed on a monochromatic liquid crystal display monitor at a resolution of 1,200 × 1,600. HRCT was presented on the screen with cine-mode display. We compared two viewing sizes (original size, i.e., the image displayed with a zoom factor of 1 in which each pixel value in the image is displayed as one pixel on the display: 13 cm × 13 cm; fit size, i.e., by zooming the captured image until it occupies the entire screen: 30 cm × 30 cm) in terms of radiologists' performance for detecting n-GGO on HRCT and the viewing times required for soft-copy reading decisions. Observer performance was analyzed in terms of the receiver operating characteristic (ROC) curve. A statistically significant improvement was found with the original size in the average area-under-the-ROC curve values for the accuracy of diagnosis and the viewing times compared to the fit size (P < 0.05). The original size with cine-mode display leads to increased lung GGO detection at CT screening for lung cancer, and the reduced time spent performing the diagnosis offers cost savings.

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“…Additionally, a new grayscale test pattern (NGTP) was developed to adjust the gradient of gray levels in thoracic computed tomography (CT) images [12] . The pattern has also been applied to the psychophysical evaluation of display functions for LCD monitors [13] , [14] .…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Commercial Color LCD and the Medical Monochrome LCD Using Randomized Object Test Patterns

Wu²,

Han

et al. 2012

PLoS ONE

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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 0.717±0.0200 and 0.740±0.0195 for the color monitor and the diagnostic monitor, respectively. The observation time (OT) was 145±27.6 min and 127±19.3 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.

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Psychophysical evaluation of calibration curve for diagnostic LCD monitor

Cited by 8 publications

References 15 publications

Effects of the DICOM grayscale standard display function on the accuracy of medical-grade grayscale and consumer-grade color displays for telemammography screening

Effects of the DICOM grayscale standard display function on the accuracy of medical-grade grayscale and consumer-grade color displays for telemammography screening

Investigation of optimal viewing size for detecting nodular ground-glass opacity on high-resolution computed tomography with cine-mode display

Comparison of the Commercial Color LCD and the Medical Monochrome LCD Using Randomized Object Test Patterns

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