Dr. Hans N. Roehrig
Research Professor Emeritus of Radiology at Univ of Arizona
SPIE Involvement:
Editor | Author | Instructor
Publications (102)

Proceedings Article | 12 September 2014 Paper
D. Nguyen, Janet Roveda, Hans Roehrig, Marisa Borders, Kimberly Fitzpatrick
Proceedings Volume 9214, 92140F (2014) https://doi.org/10.1117/12.2066183
KEYWORDS: Image segmentation, Visualization, Image processing, Optical filters, Gaussian filters, Telemedicine, Data communications, Image quality, Fuzzy logic, Edge detection

Proceedings Article | 5 September 2014 Paper
Proceedings Volume 9186, 91860I (2014) https://doi.org/10.1117/12.2064798
KEYWORDS: Radiology, Radio optics, Medicine, Video, Diagnostics, Optics, X-rays, Angiography, Computing systems, Spatial resolution

Proceedings Article | 26 September 2013 Paper
Dung Nguyen, Janet Roveda, Marisa Borders, Kimberly Fitzpatrick, Hans Roehrig
Proceedings Volume 8853, 88530K (2013) https://doi.org/10.1117/12.2029781
KEYWORDS: High dynamic range imaging, Image acquisition, Compressed sensing, Image compression, Image restoration, Medical imaging, Digital imaging, Mammography, Digital signal processing, Infrared imaging

Proceedings Article | 28 March 2013 Paper
Xiliang Gu, Jiahua Fan, Hans Roehrig
Proceedings Volume 8673, 86731T (2013) https://doi.org/10.1117/12.2008535
KEYWORDS: Modulation transfer functions, LCDs, Diagnostics, Imaging systems, Spatial resolution, Calibration, Spectroscopy, Medical imaging, Charge-coupled devices, Medical research

Proceedings Article | 17 October 2012 Paper
Xiliang Gu, Jiahua Fan, Hans Roehrig
Proceedings Volume 8508, 85080G (2012) https://doi.org/10.1117/12.966652
KEYWORDS: Modulation transfer functions, Image quality, LCDs, Spatial resolution, Imaging systems, Charge-coupled devices, Diagnostics, Cameras, CCD cameras, Colorimetry

Showing 5 of 102 publications
Proceedings Volume Editor (17)

SPIE Conference Volume | 22 September 2015

SPIE Conference Volume | 18 September 2014

SPIE Conference Volume | 8 October 2013

SPIE Conference Volume | 16 October 2012

SPIE Conference Volume | 8 September 2011

Showing 5 of 17 publications
Conference Committee Involvement (17)
Medical Applications of Radiation Detectors V
13 August 2015 | San Diego, California, United States
Medical Applications of Radiation Detectors IV
19 August 2014 | San Diego, California, United States
Medical Applications of Radiation Detectors III
29 August 2013 | San Diego, California, United States
Medical Applications of Radiation Detectors II
16 August 2012 | San Diego, California, United States
Medical Applications of Radiation Detectors
25 August 2011 | San Diego, California, United States
Showing 5 of 17 Conference Committees
Course Instructor
SC883: Consistent Color and Grayscale Presentation for Medical Color Displays
This course provides you with a basic working knowledge of color and color calibration. The course concentrates on consistent color and consistent grayscale presentation for the increasingly used color displays in medical imaging replacing the traditional monochrome displays. There will be four main subject areas: • The science of color and color measurements. Here you will learn about the tri-chromatic theory, the color-matching functions, the tristimulus values, the chromaticity coordinates and the various color spaces. Of particular importance for the measurement of color are the colorimeter and the spectro-photometer. • Computational tools for calibration and color reproduction. In this section you will be exposed to a typical system consisting of a colorimeter and a color display with an image for measuring color coordinates of that image, or a color camera for capturing the image of a color display like a color LCD. You learn that you need to do an input calibration, processing and an output calibration. • Assessment of display performance for medical imaging systems. In this section you will be reminded of the AAPM Task Group 18 and its efforts to establish performance criteria recommending minimum performance requirements for safe utilization of electronic monochrome displays in medical applications. You will learn that such efforts will also be required for color displays. • Visual thresholds and the effect of color on the correct diagnosis. In this section you will hear about some of the areas in medical imaging in which the importance of color images and color displays have been explored. Emphasis will be on radiologic imaging, but examples from other areas such as pathology and dermatology where true color images are used will also be referenced. Ultimately the objective of this course is to familiarize you with the elements of consistent color presentation as well as consistent grayscale presentation of medical images on digital color displays for medical image interpretation.
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