By M. Pfeiler (auth.), Dr. med. Wolfgang Lanksch, Privatdozent Dr. med. Ekkehard Kazner (eds.)
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Additional info for Cranial Computerized Tomography
Iedulloblastoma and ependymoma are usually rather cellular and therefore of higher SO. Sometimes they protrude into CSF spaces. In cerebellar heman~ioma (Lindau's tumor) SO is decreased nOl only in connection of lipids. In meni_n-'1iom~ of the arachnolhel~al lype SO is increased, even more so in the presence of many calcified psammoma bodies. Less frequently there is calcification of fibrous strands in meningioma of the fibroplastic type. Vascular meningioma has, by and large, the same SD as normal tissuL'.
2 mrn) and Lhen consequently sLarts sinking in one-ye>ar olds until it reaches a height of ca. >e identical witll the adult value (Fig. 6). The part of the ant. cranial fossa situated in front of the jugum sphenoidale is of great medical importance. The so-called olfactory fossae, the endofronLal eminence, as well as both medial and endofrontal foveae arise here (Fig. 7). >ered that. thp cribriform plaLe, as is well known, is inclined at various angles. >y 6 months of age it is ca. 1 mrn (Fiqs.
Geometrical unsharpness and uncertainty of attenuation values by quantum noise Fig . 16 Fig. 1 7 Figs. 16 and 17. CT images without and with artefact 19 Range of projections 1% 67% 50% 17% 83 % 100% (complete image) Fig. 18. CT image of a phantom produced by convolution method: Image build-up by single projections phantom artificial angle deviation of max. 7 of angle subtended by consecutive projections or "angular" movement of object detail for only one projection Fig . 19 . Artefact generat e d by a single (artificially deviation ~erformed) angle 20 phantom artificial angle deviation of max.
Cranial Computerized Tomography by M. Pfeiler (auth.), Dr. med. Wolfgang Lanksch, Privatdozent Dr. med. Ekkehard Kazner (eds.)