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, totally revised variation of the unique quantity released in 1982. event in neuroradiology has proven the phenomenal price of computed tomography (CT) for the analysis of space-occupying lesions in the cranium and orbit. it would be assumed, then, that the second one variation of this e-book might easily characterize a numerically improved continua tion of the preferred first variation. that isn't the case, notwithstanding. Advances in imaging thoughts have promp ted the production of a brand new e-book whose elevated identify displays its extra comprehen sive nature. The further illustrations, the revised textual content, and the multiplied circle of editors and individuals rfile this. considering the fact that booklet of the 1st variation, a brand new modality, magnetic resonance imaging (MRI), has develop into a longtime neuroradiologic examine. We felt it was once necessary to contain this new modality in our booklet and discover its functions as an accessory or substitute to CT scanning. as a result excessive acquisition bills of MRI and the nonetheless small variety of MR devices at present in operation, we've got relied partially on photos supplied via different associations and personal practitioners, to whom we're indebted. Many difficulties in terms of MR, either when it comes to apparatus and photo interpretation, haven't begun to be resolved. there isn't any denying that we nonetheless have a lot to learn.
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Additional info for Computed Tomography and Magnetic Resonance Tomography of Intracranial Tumors: A Clinical Perspective
1986). Here we shall give a brief introduction to the essential clinical aspects of MRI to aid the reader in interpreting the MR scans given in the clinical portion of this book. a) Basic Physical Principles of MRI Hydrogen nuclei possess a property called spin. Because the nuclei carry an electric charge, the motion of the nuclei results in the creation of a magnetic field (magnetic moment). When the hydrogen nuclei are exposed to an external static magnetic field, as in MRI, the nuclei will interact with the external field by virtue of their magnetic moment.
Technique of MR Examination 31 II b c d Fig. Cla-d. Image contrast. Appearance of a lesion on pulse sequences commonly used for clinical MRI. ) a SE 400/35: A subtle hypointensity is seen adjacent to the right occipital horn. b SE 1600/35: An area of markedly increased signal is demonstrated in the same location. c SE 1600/70: The hyperintense lesion contrasts sharply with adjacent structures. ) d IR 1500/400: The lesion is markedly hypointense to the adjacent white matter (normal brain anatomy is displayed in high contrast) 32 Technique of CT and MR Examinations Fig.
This can be very helpful in differentiating areas that show varying degrees of high signal intensity (Heindel et al. 1986; Rinck et al. 1985). Disadvantages of multi-echo sequences are prolonged imaging times and confinement to a few image sections. , IR 1500/400) provides high gray matter-white matter contrast. The white matter (short Tl) has a significantly higher signal intensity than the cortex and subcortical nuclei (longer Tl). CSF appears virtually as an area of signal void (black). Pathologic processes (tumor, necrosis, edema) appear hypointense because of their long T1 values relative to the white matter (Fig.
Computed Tomography and Magnetic Resonance Tomography of Intracranial Tumors: A Clinical Perspective 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