Endoscopy Practice and Safety
Peter B. Cotton
5. Digital documentation in endoscopy
Fig. 1 The marriage between video endoscopy racks and PCs paves the way for the new world of digital image documentation.
Fig. 2 The principles of mixing primary colors in the two main color models.
Fig. 3 A typical color panel of computer software allows to adjust the various parameters of either color model.
Fig. 4 The illustration shows how an image area is divided into equally sized pixels. The smaller the pixels, the more you can fit
per area unit (e.g. inch), and the higher the resolution.
Fig. 5 The difference between higher (100 dpi) and lower (10 dpi) resolution. Pixelation is clearly seen at lower resolutions. The
same phenomenon is seen if a picture is zoomed beyond its generic resolution.
Fig. 6 Compressing a typical endoscopic image from 140 kbyte (already compressed from around 800 kbyte) to 12 kbytes is hardly noticeable.
Fig. 7 Intelligent reduction of the number of colors in an endoscopic image does not ruin the image, because the color range is limited
to the gray-yellow-red hues.
Fig. 8 Comparison between maximum compression with regular JPG (left) and with the JPEG 2000 standard (right). The file size is the same: minute.
Fig. 9 Commercial PACS products rely heavily on the DICOM standard for image handling.
Fig. 10 Clinical acceptability of compressed GI images (adapted from ).
Fig. 11 Initial suggestion for standard imaging of upper endoscopy. Will this be part of our future endoscopy report?
Fig. 12 Pure color manipulation can be used to amplify the subtle differences in mucosal color in the original picture (left), revealing
an early gastric cancer.
Fig. 13 The overall MST structure covering all core aspects of the endoscopy report.
Fig. 14 The MST model for describing findings, assigning attribute values to predefined lesion-specific attributes.
Copyright © Blackwell Publishing, 2004