2018 Volume 27 Issue 2 Pages 195-201
In this study, we investigated the possibility of using an organic light-emitting diode（OLED） monitor with a super-high contrast ratio for breast ultrasonography. We used the following ３ monitors: monitor A had grayscale characteristics using γ and was attached to an ultrasonography device; monitor B was an OLED monitor with grayscale characteristics using γ; and monitor C was an OLED monitor with grayscale characteristics using the Grayscale Standard Display Function. The evaluated images were displayed as “still images of a breast ultrasonic QC phantom,” “still images of breast cancer,” or “moving images of breast cancer” on all ３ monitors simultaneously. In the preliminary experiment, the observers were４６licensed doctors specialized in breast cancer. This study evaluated ２ experiments using the ２-alternative forced-choice method. Observer test１estimated the effectiveness of the SHC monitor by comparing monitor A with monitor B. Observer test２estimated the effectiveness of the grayscale characteristics on the SHC monitor by comparing monitor B with monitor C. Many of the doctors selected monitor B because the detection target was clearly depicted on the phantom images. The still and moving images depended on the daily diagnosis environment. The visibility of the inner echo decreased on the high-contrast-ratio monitor. Overall, monitor C was judged to be dark. The contrast and brightness of monitor C were improved, and an experiment using １２ observers was performed. Monitor C was judged to be the best breast ultrasonography monitor.