Biomedical Engineering Reference
In-Depth Information
Figure 3.6. CT section through the lung viewed using three different level
and window settings: (a) lung settings; (b) tissue settings; (c) bone settings.
The lower panel shows the approximate location of tissues on the Hounsfield
scale, and the level and window setting used to produce the three images
Images courtesy of GTY Chen and M Shinichiro, MGH, USA.
Figure 3.7 shows an example of a CT scan in which the identification
of disease in different regions required different window and level
settings.
Figure 3.7. Delineation of the GTV required different window and level
settings to examine the possible involvement of: (a) the soft tissues (level/
window: 20/135), and (b) the bony anatomy (level/window: 30/670). The
The destruction of the clivis by tumor could only be seen clearly in the
bone window, whereas the appreciation of the anterior extent of the tumor
required the use of soft-tissue settings. Figure courtesy of G. Goitein, PSI, CH.
