By Prof. Dr. med. Claus Claussen, Prof. Dr. med. Rudolf Fahlbusch, Prof. Dr. med. Roland Felix, Prof. Dr. med. Thomas Grumme, Dr. rer. nat. Jürgen Heinzerling, Priv.-Doz. Dr. med. José R. Iglesias-Rozas, Prof. Dr. med. Ekkehard Kazner, Prof. Dr. med. Konrad
This e-book represents the second one, absolutely revised version of the unique quantity released in 1982. event in neuroradiology has proven the exceptional price of computed tomography (CT) for the prognosis of space-occupying lesions in the cranium and orbit. it would be assumed, then, that the second one version of this publication could easily characterize a numerically accelerated continua tion of the preferred first variation. that isn't the case, even though. Advances in imaging innovations have promp ted the production of a brand new publication whose increased identify displays its extra comprehen sive nature. The additional illustrations, the revised textual content, and the accelerated circle of editors and members record this. due to the fact that book of the 1st variation, a brand new modality, magnetic resonance imaging (MRI), has develop into a longtime neuroradiologic learn. We felt it was once necessary to comprise this new modality in our booklet and discover its services as an accessory or substitute to CT scanning. a result of excessive acquisition bills of MRI and the nonetheless small variety of MR devices at present in operation, we've relied partly on photographs supplied by means of different associations and personal practitioners, to whom we're indebted. Many difficulties on the subject of MR, either by way of apparatus and snapshot interpretation, haven't begun to be resolved. there is not any denying that we nonetheless have a lot to learn.
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Extra resources for Computed Tomography and Magnetic Resonance Tomography of Intracranial Tumors: A Clinical Perspective
These sequences are of value in the differential diagnosis of pathologic tissues with short T1 relaxation times, including chronic hematomas, fat-containing lesions, and contrast-enhancing tumors. , SE 1600/35). Proton-density-weighted images can be obtained along with T2-weighted images in almost all MR scanners without increasing the scan time by means of the double-echo technique. The advantage of SE 1600/35 images is their generally high signal- to-noise ratio with excellent anatomic resolution (Fig.
This complex is extremely stable (dissociation constant 10-23 ), so there are virtually no free gadolinium ions in aqueous solution. The high stability of the complex is a major reason for the extremely low toxicity of Gd-DTPA (Weinmann et al. 1984). The pharmacokinetic behavior of GdDTPA is determined by the physicochemical properties of DTPA. The extreme hydrophilia and relatively high molecular weight of the Gd-DTPA molecule (molecular weight 590) account for the exclusively extracellular distribution of the contrast agent (Weinmann et al.
Blood vessels present a characteristic MR pattern. Because the hydrogen nuclei move out of the image volume between pulses, flowing blood may produce little or no MR signal in standard pulse sequences. Thus, in MRI blood vessels are identified without contrast agents by virtue of their characteristically low signal intensity (Fig. C6). f) Contrast-Enhanced MRI For a given pulse sequence, the contrast in MRI is determined by the tissue parameters of proton density and relaxation times (T1, T2). Substances that alter these tissue parameters can serve as contrast agents.