Browsing by Author "Cheng, Wei-Chung"
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- ItemConsistency and standardization of color in medical imaging: a consensus report.(2015-01-24) Badano, Aldo; Revie, Craig; Casertano, Andrew; Cheng, Wei-Chung; Green, Phil; Kimpe, Tom; Krupinski, Elizabeth; Sisson, Christye; Skrøvseth, Stein; Treanor, Darren; Boynton, Paul; Clunie, David; Flynn, Michael J; Heki, Tatsuo; Hewitt, Stephen; Homma, Hiroyuki; Masia, Andy; Matsui, Takashi; Nagy, Balázs; Nishibori, Masahiro; Penczek, John; Schopf, Thomas; Yagi, Yukako; Yokoi, HidetoThis article summarizes the consensus reached at the Summit on Color in Medical Imaging held at the Food and Drug Administration FDA on May 8 9 2013 co sponsored by the FDA and ICC International Color Consortium The purpose of the meeting was to gather information on how color is currently handled by medical imaging systems to identify areas where there is a need for improvement to define objective requirements and to facilitate consensus development of best practices Participants were asked to identify areas of concern and unmet needs This summary documents the topics that were discussed at the meeting and recommendations that were made by the participants Key areas identified where improvements in color would provide immediate tangible benefits were those of digital microscopy telemedicine medical photography particularly ophthalmic and dental photography and display calibration Work in these and other related areas has been started within several professional groups including the creation of the ICC Medical Imaging Working Group
- ItemImage quality characteristics of handheld display devices for medical imaging.(2013-11-15) Yamazaki, Asumi; Liu, Peter; Cheng, Wei-Chung; Badano, AldoHandheld devices such as mobile phones and tablet computers have become widespread with thousands of available software applications Recently handhelds are being proposed as part of medical imaging solutions especially in emergency medicine where immediate consultation is required However handheld devices differ significantly from medical workstation displays in terms of display characteristics Moreover the characteristics vary significantly among device types We investigate the image quality characteristics of various handheld devices with respect to luminance response spatial resolution spatial noise and reflectance We show that the luminance characteristics of the handheld displays are different from those of workstation displays complying with grayscale standard target response suggesting that luminance calibration might be needed Our results also demonstrate that the spatial characteristics of handhelds can surpass those of medical workstation displays particularly for recent generation devices While a 5 mega pixel monochrome workstation display has horizontal and vertical modulation transfer factors of 0 52 and 0 47 at the Nyquist frequency the handheld displays released after 2011 can have values higher than 0 63 at the respective Nyquist frequencies The noise power spectra for workstation displays are higher than 1 2 10 5 mm 2 at 1 mm 1 while handheld displays have values lower than 3 7 10 6 mm 2 Reflectance measurements on some of the handheld displays are consistent with measurements for workstation displays with in some cases low specular and diffuse reflectance coefficients The variability of the characterization results among devices due to the different technological features indicates that image quality varies greatly among handheld display devices