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 booklet represents the second one, totally revised version of the unique quantity released in 1982. event in neuroradiology has proven the exceptional worth of computed tomography (CT) for the analysis of space-occupying lesions in the cranium and orbit. it'd be assumed, then, that the second one variation of this ebook could easily characterize a numerically elevated continua tion of the preferred first variation. that isn't the case, notwithstanding. Advances in imaging innovations have promp ted the production of a brand new ebook whose multiplied name displays its extra comprehen sive nature. The extra illustrations, the revised textual content, and the multiplied circle of editors and members record this. on account that e-book of the 1st variation, a brand new modality, magnetic resonance imaging (MRI), has develop into a longtime neuroradiologic learn. We felt it used to be necessary to contain this new modality in our ebook and discover its services as an accessory or substitute to CT scanning. as a result of the excessive acquisition expenses of MRI and the nonetheless small variety of MR devices presently in operation, we have now relied partially on pictures supplied via different associations and personal practitioners, to whom we're indebted. Many difficulties in relation to MR, either by way of gear and photograph interpretation, have not begun to be resolved. there is not any denying that we nonetheless have a lot to learn.
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Extra info 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.
T2-weighted images are very sensitive in detecting lesions with prolonged T2 relaxation times (Brant-Zawadzki et al. 1984), and these sequences are generally preferred for screening examinations. Increasing TE further enhances the effect of T2 differences and highlights contrast between healthy and diseased tissues. This principle is applied clinically in the multi-echo sequence. In the technique used in the institutions participating in this study (SE 1600/30-240, Technique of MR Examination eight echoes), eight images of the same section are acquired with progressive T2 weighting of the successive images (Fig.
Among these nuclei are hydrogen-1 eH), phosphorus-31 C1p), carbon13 (l3C), and fluorine-19 9 F). e Table 4. 00 (%) 38 Technique of CT and MR Examinations B' a Bo Btff = Bo - v • ~o a B. ~ , o Fig. CS. Physical origin of the chemical shift. The externally applied magnetic field Bo induces a precession of the electron cloud surrounding the nucleus, generating an opposite field B'. The nucleus experiences a net field Boff , which is reduced by B' b) Experimental Considerations H2 O 1"')' 10ppm PCr ;k: I 31p 11\ 25ppm co 200ppm CH 2 c=c 100 o Fig.