A process of converting (rendering) image pixel/voxel into 2D/3D graphical representation. Most computers support 8-bit (256) grayscale display, sufficient to human vision that can only resolve 32-64 grayscale. A common 12/16-bit (4096/65536 grayscales) medical image can be selectively displayed based on grayscale classification. Window width (display range in grayscale) and linear level function (center of the window width) are frequently used in adjusting display content.
Published in Chapter:
3D and 4D Medical Image Registration Combined with Image Segmentation and Visualization
Guang Li (National Institutes of Health, USA), Deborah Citrin (National Cancer Institute, USA), Robert W. Miller (National Cancer Institute, USA), Kevin Camphausen (National Cancer Institute, USA), Boris Mueller (Memorial Sloan-Kettering Cancer Center, USA), Borys Mychalczak (Memorial Sloan-Kettering Cancer Center, USA), and Yulin Song (Memorial Sloan-Kettering Cancer Center, USA)
Copyright: © 2008
|Pages: 9
DOI: 10.4018/978-1-59904-889-5.ch001
Abstract
Image registration, segmentation, and visualization are three major components of medical image processing. Three-dimensional (3D) digital medical images are three dimensionally reconstructed, often with minor artifacts, and with limited spatial resolution and gray scale, unlike common digital pictures. Because of these limitations, image filtering is often performed before the images are viewed and further processed (Behrenbruch, Petroudi, Bond, et al., 2004). Different 3D imaging modalities usually provide complementary medical information about patient anatomy or physiology. Four-dimensional (4D) medical imaging is an emerging technology that aims to represent patient motions over time. Image registration has become increasingly important in combining these 3D/4D images and providing comprehensive patient information for radiological diagnosis and treatment.