Biomedical Engineering Reference
In-Depth Information
FIGURE 7.25
Meningioma: Contrast-enhanced T1-weighted images from volume acquisition obtained
initially (a) and 13 months later (b). Subtraction of (a) from (b) in image (c) shows by the
white and dark lines (arrows) that the tumor has grown between the scans.
FIGURE 7.26
Astrocytoma: T2-weighted images before (a) and after (b) treatment. Subtraction of (a) from
(b) is shown in (c). The responding areas appear dark in (c) but the more anterior white
area has progressed (arrow).
FIGURE 7.27
Schizophrenia: Registered subtraction image, showing differences that developed over six
months after first admission. The ventricles have increased in size, and abnormalities
(biphasic changes) are seen in the left temporal lobe.
