By John R. Bradshaw (Auth.)
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Extra resources for Brain Imaging. An Introduction
This parameter is particularly sensitive for the detection of disease processes. As in the case of Tl an increase of free water causes a prolongation of T2 relaxation time. A further parameter which is finding increasing clinical applications is flow effects. When moving blood is magnetized it has moved on before the resonant signal is received and leaves a signal void at the appropriate site on the image. This makes it possible to identify vessels intracranially and elsewhere, and quantitative flow measurements are also possible.
Figure 47 Imaging techniques 25 Figure 48 is of a normal lateral scan, the patient's face is on the right of the image. Scans of both sides of the brain are usually obtained. Similar areas of uptake are again seen but in this view the sagittal sinus lies on the vault uptake and is more intense posteriorly. The transverse sinus is also seen crossing the posterior fossa. Figure 48 Cerebral ultrasound Apart from some early work using a simple ultrasound probe to assess the position of midline structures, ultrasound was not used in the study of intracranial disease until the late seventies.
On either side of these structures lie the basal nuclei. Below the third ventricle lies the suprasellar region. Figure 49 Figure 50 shows a normal parasagittal scan along the length of a lateral ventricle; the choroid plexus and temporal horn are demonstrated. The configuration of these structures on a scan will vary depending on the precise angulation of the probe. Figure 50 Imaging techniques Cerebral angiography Detailed radiographic studies of the cerebral vessels have been possible for many years.
Brain Imaging. An Introduction by John R. Bradshaw (Auth.)