RöFo : Fortschritte auf dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
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CT scans of 31 patients, who had been evaluated because of metastases of unknown origin, were reviewed. Diagnosis of the primary site was established in 18 of the 31 patients only. ⋯ CT scans were helpful in identifying an occult primary tumour in 6 patients; in 5 cases the primary location could not be detected by CT examination. In 2 patients CT scans considered a wrong organ to be the site of an unknown primary tumour.
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Using a 1.5 Tesla whole body system, image-guided localized 31P NMR spectra of normal brain tissue and of various intracranial tumours have been obtained. The spectra of normal brain tissue were reproducible, although further studies are necessary to determine physiological variability. ⋯ In follow-up studies of brain tumours undergoing treatment by chemotherapy or radiotherapy 31P MR spectroscopy demonstrated metabolic changes at a time when 1H MR imaging did not show any changes in tumour size or structure. Further investigations have to be done in order to evaluate the usefulness of 31P MRS for detecting therapeutic response in follow-up studies.
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The series comprises 27 patients examined by CT to detect, locate or exclude a foreign body. 22 of them actually had an orbital foreign body. In three cases CT was the primary method and showed the foreign body correctly, while in 18 it was first detected in plain films and CT was performed to locate it. 20 metallic foreign bodies were hyperdense in appearance. Two cases had wooden foreign bodies, one with a density of +10 HU and the other hypodense with a value of about -434 to -446 HU. ⋯ Experiments conducted to determine the CT densities of different pieces of wood gave results varying from -618 HU to +23 HU. The highest densities obtained for glass varied from +522 HU to +2000 HU. The density of a plastic lens was -105 HU.