Application of the Grayscale Standard Display Function to General Purpose Liquid-crystal Display Monitors for Clinical Use

Tanaka, Nobukazu; Naka, Kentaro; Sueoka, Masaki; Higashida, Yoshiharu; Morishita, Junji

doi:10.6009/jjrt.66.25

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…Color images are often used to support image‐based diagnoses and to obtain informed consents from patients. Images displayed and interpreted on a medical monitor are assessed at a gamma setting of GSDF or γ 2.2 . Even if the color number is the same, different hues, chroma and lightness between GSDF and γ 2.2, could result in medical images that will generate quite different impressions depending on the color setting.…”

Section: Discussionmentioning

confidence: 99%

Impact of calibration methods for color medical displays on interpreting brain SPECT images

et al. 2019

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Purpose Color images are visualized on medical monitors that are adjusted by a grayscale standard display function (GSDF) or γ2.2. Although the GSDF is visually displayed as a linear graded grayscale, it does not specify how color medical images should be presented. On the other hand, the usual gamma setting for color images is γ2.2, but it has not been standardized. The color standard display function (CSDF) has recently been proposed as a standardized gamma setting for color medical monitors. However, the influence of various gamma settings on image characteristics should be determined. The present study aimed to identify differences in color‐scale characteristics on nuclear medicine images displayed on medical monitors adjusted by CSDF, GSDF, and γ2.2. Methods Transverse normal (n = 1) and abnormal (n = 5) brain perfusion images were generated using a mathematical digital phantom. Transverse phantom and clinical brain images are shown using the clinically applied eight‐color scale. Five nuclear medicine experts visually assessed phantom and clinical images using a defect severity scale that ranged from zero (no defect) to four (defect). Receiver operating characteristic curves were created and areas under the curves (AUCs) were analyzed. Defect scores for the clinical study were evaluated in the nine segments on basal ganglia slice, and defect scores were summed for each patient. Results The average defect score for color A significantly differed in multiple comparison tests, but not in post hoc tests. The ranges of AUC for CSDF, GSDF, and γ2.2 were 0.86–0.94, 0.82–0.94, and 0.88–0.97, respectively. The AUCs of CSDF in all color scales did not significantly differ from other gamma settings. The summed defect scores of CSDF were similar to those of other gamma settings. Conclusion Nuclear medicine images were equally valid when adjusted by CSDF even at various gamma settings. Nuclear medicine images can be evaluated equally using any gamma setting. Nonetheless, the color gamma setting for medical monitors should be standardized.

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Section: Discussionmentioning

confidence: 99%

Impact of calibration methods for color medical displays on interpreting brain SPECT images

et al. 2019

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“…In Fig. 5, L s represents the ideal output according to the Equation (10). The experimental data L m and calculation data L s corresponding to several typical DDLs are shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…Specifically, the function establishes the relationship between grayscale and luminance, providing a standardized display specification for grayscale images. Existing GSDF in DICOM is currently widely used to calibrate medical image display and printing devices as a display specification [10], [11]. Based on the nonlinear perceptual visual characteristics of human eyes, a compromised GSDF with a brightness of 0.05 cd/m 2 -4000 cd/m 2 is given in the form of a higher-order logarithmic expression, taking the image display characteristics in different luminance ranges into account.…”

Section: Introductionmentioning

confidence: 99%

A Neural Network Processing Method Based on Self-Assembly Equipment for Optical Image Display Standardization

Liu

Jiang

et al. 2019

IEEE Access

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Optical image is a kind of important data for communication because it is a two or three -dimensions data set to express communication information such as geographical signal, medical signal, remote sensing signal, etc. Thus, how to express the optical image properly is critical for the communication analytics. A new display method for optical image is described which is derived from the concept-Grayscale Standard Display Function (GSDF) which has been defined in DICOM, a medical image standard. The method analysis GSDF based on neural network processing which is different to DICOM. And the training data are from a self-assembly Equipment in NIM which is a traceable optical display equipment. Thus, the method has common usage for all optical image display, exceeding medical image. Furthermore, it is suitable for standardization because of the traceability. INDEX TERMSOptical image display Grayscale Standard Display Function (GSDF) neural network standardization.

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“…However, it cannot meet the needs of a wider range of luminance nor current application areas. Notably, the implementation of the standard model is not mandatory, and it is not traceable [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

A Digital Grayscale Generation Equipment for Image Display Standardization

Jiang

Liu

et al. 2020

Applied Sciences

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The standardization of grayscale display is essentially significant for image signal communication, transmission, and terminal reading. The key step of this standardization is establishing a traceable equipment of grayscale. As a relative value, grayscale is transferred to two different absolute values to satisfy different traceability methods, including optical density for hardcopy image and luminance for softcopy. For luminance, a generation equipment is designed to build the relationship between luminance and grayscale. In this work, novel equipment is established using digital light processing (DLP) by time-frequency modulation, and the corresponding uncertainty is analyzed. The experiment result shows that this digital equipment builds the relationship between grayscale and luminance in the range of 0.16-4000 cd/m2. It enables traceable measurement of grayscale to luminance on this equipment with high accuracy and can provide a standardized reference for the display of grayscale images in the fields of medicine, remote sensing, non-destructive testing, etc.

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Application of the Grayscale Standard Display Function to General Purpose Liquid-crystal Display Monitors for Clinical Use

Cited by 4 publications

References 4 publications

Impact of calibration methods for color medical displays on interpreting brain SPECT images

Impact of calibration methods for color medical displays on interpreting brain SPECT images

A Neural Network Processing Method Based on Self-Assembly Equipment for Optical Image Display Standardization

A Digital Grayscale Generation Equipment for Image Display Standardization

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