Investigation of optimal display size for detecting ground-glass opacity on high resolution computed tomography using a new digital contrast-detail phantom

Yamaguchi, Michihiro; Fujita, Hideki; Bessho, Yuichi; Inoue, Tatsuro; Asai, Yoshiyuki; Murase, Kenya

doi:10.1016/j.ejrad.2010.04.019

Cited by 7 publications

(4 citation statements)

References 16 publications

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“…In a previous paper [7,8], we reported the usefulness of the reduced display size in soft-copy diagnosis by using clinical chest X-ray images and a digital contrast detail phantom. However, to date, the optimal size for viewing of lung HRCT images that are displayed in cine mode on the LCD monitor has not been clarified.…”

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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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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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“…In a previous report, (4) we evaluated the impact of display size on observer performance in high‐resolution CT images. We reported that the original display and reduced display sizes were superior in observer performance to the enlarged display size.…”

Section: Discussionmentioning

confidence: 99%

“…The diagnostic interpretations are influenced by various factors (e.g., workstation software, display devices, resolution, and luminance) (1–3) . The display size is also an important factor (1,4) …”

Section: Introductionmentioning

confidence: 99%

“…However, commercially available CD phantoms are primarily used for the evaluation of X‐ray images and difficult to use for CT or MRI images. We previously reported on the development of a d‐CD phantom that facilitates evaluation of observer performance, and investigated the relationship between display size and observer performance (4) . Recently, we developed a new digital CD (d‐CD) phantom in which the digital driving level (DDL) of the background, width of the DDL, and contrast were adjustable.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of optimal display size for viewing T1‐weighted MR images of the brain using a digital contrast‐detail phantom

Fujita

Kuwahata

Hattori

et al. 2016

J Applied Clin Med Phys

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We clarified the relationship between the display size of MRI images and observer performance using a digital contrast‐detail (d‐CD) phantom. The d‐CD phantom was developed using Microsoft Visual Basic 2010 Express. It had a 512×512 matrix in size and a total of 100 holes, whose diameter increased stepwise from 4 to 40 pixels with a 4‐pixel interval in the vertical direction; the contrast varied stepwise in the horizontal direction. The digital driving level (DDL) of the background, the width of the DDL, and the contrast were adjustable. These parameters were determined on the basis of the actual T1‐weighted magnetic resonance (MR) images of the brain. In this study, the DDL, width, and contrast were set to 85, 20, and 1, respectively. The observer performance study was performed for three different display sizes (30 cm×30 cm as the enlarged size, 16 cm×16 cm as the original size, and 10 cm×10 cm as the reduced size) using a 2‐megapixel color liquid crystal display monitor, and it was analyzed using Friedman and Wilcoxon statistical tests. The observer performances for the original display false(p<0.01false) and the reduced display sizes false(p<0.01false) were superior to that observed for the enlarged size, whereas there was no significant difference between the original display and reduced display sizes false(p=0.31false). Evaluation with the digital phantom simulating MR imaging also revealed that the original and reduced display sizes were superior to the enlarged display size in observer performance. The d‐CD phantom enables a short‐term evaluation of observer performance and is useful in analyzing relationship between display size and observer performance.PACS number: 87.57.‐s

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Scan Parameters and CT Radiation Dose

Singh

Kalra

2012

Radiation Dose From Multidetector CT

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Investigation of optimal display size for detecting ground-glass opacity on high resolution computed tomography using a new digital contrast-detail phantom

Cited by 7 publications

References 16 publications

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

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

Investigation of optimal display size for viewing T1‐weighted MR images of the brain using a digital contrast‐detail phantom

Scan Parameters and CT Radiation Dose

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