By John R. Bradshaw (Auth.)

ISBN-10: 0723605963

ISBN-13: 9780723605966

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CT does not have sufficient spatial resolution to permit accurate and detailed assessment of aneurysms; extensive angiography is required for these common lesions. CT will show the number and extent of infarcts but will not provide information about the nature of the cause, such as atheroma, stenosis or embolism, or its location. Angiography may be particularly hazardous in the presence of these latter conditions but may be necessary for a complete diagnosis and particularly where surgical treatment is contemplated.

This density is the result of two processes present in many brain lesions: (i) increased perfusion by blood vessels supplying the lesion or the affected adjacent brain, and (ii) breakdown of the normal blood-brain barrier, thus allowing contrast medium to leak into and opacify the affected tissue. The pattern of enhancement seen in brain pathology is often quite characteristic, and when assessed in conjunction with the other data on the scans can provide vital clues about the diagnosis. Imaging techniques 53 Figure 93 shows an enhanced scan on the patient in Figure 89.

The T2 relaxation time is dependent on nuclear spins going out of phase with those surrounding them. 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.

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Brain Imaging. An Introduction by John R. Bradshaw (Auth.)


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