Search PubMed⌕ Search

Biomedical subjects

W Steinbrich

Publications and source records attributed to W Steinbrich.

At least 109 records · Page 6Linked to original sources
PubMed1986

[Preoperative staging of bronchial carcinoma. Value of magnetic resonance in comparison with computed tomography].

The results of MR and CT examinations for tumour staging were compared in 30 patients with bronchial carcinomas. They were also related to operability. The findings have been compared with the data in the previous literature. The results have shown both methods to be of equal value. The differentiation between tumour tissue and vascular structures is somewhat better shown by magnetic resonance, but peripheral and bone involvement is better shown on CT. These results require further examinations as well as operative and histological confirmation.

Adult↗
PubMed1986

[Magnetic resonance tomography of brain tumors--comparison of the results using the multi-echo technic and gadolinium-DTPA].

In thirty-seven MR examinations of intracranial tumours equivalent sections were obtained in a multi-echo technique before and after intravenous injection of 0.1 mmol. gadolinium DTPA/kg body weight. From this comparison the following preliminary conclusions have been drawn concerning the demonstration of the tumour, its delineation and type: Contrast administration does not unequivocally improve the sensitivity. In 55% of the cases, differentiation between tumour and oedema respectively normal brain tissue was easier after Gd-DTPA. Diffusely infiltrating gliomas remain a problem, since their extent is uncertain with or without contrast medium. The structure of the tumour can already be adequately characterized by the multi-echo technique. In order to diagnose the type of tumour, the criteria which apply to Gd-DTPA are similar to those used for iodine-containing contrast media in CT.

Astrocytoma↗
PubMed1986

[MR of ischemic brain diseases. A comparison with CT, PET (18-fluorodeoxyglucose) and angiographic results].

The results of MRI and CT in 55 patients with brain infarcts were compared; in 26 of these cases an additional PET examination was obtained in order to study the regional glucose utilisation. MRI was superior to CT, demonstrating 11% more of the infarcts, particularly during the first 24 hours, in small lesions confined to the grey or subcortical white matter and in infratentorial ischemic lesion. On the other hand, only CT was able to show fresh hemorrhage, although MRI was the method of choice to demonstrate old blood collections. To characterise the follow up of an infarct, CT and MRI were similar, except the marginal contrast enhancement sometimes demonstrated by CT studies between the 2nd and 4th week after stroke event. PET was inferior to show details because of its poorer spatial resolution, but anyhow had a high sensitivity and provided additional informations concerning secondary inactivations of brain areas not directly damaged. Additionally PET was able to demonstrate areas of anaerobic glycolysis and lesions of diminished glucose utilisation in TIAs. Small areas of gliosis in the white matter of the cerebral hemispheres were frequently found in patients with cerebro-vascular diseases; they were best shown by MRI, but do not correlate with the extent of vascular stenoses or occlusions, shown by angiography.

Adolescent↗
PubMed1986

[Magnetic resonance tomography of spinal masses].

We examined 22 intramedullary, 17 intradural extramedullary and 20 extradural lesions, with direct involvement of the spinal cord by magnetic resonance tomography, using surface coils and 5 mm., or narrower continuous sections. Spinecho pulse sequences are suitable for multi-slice examinations. T.1-weighted examinations are suitable for demonstrating the syrinx in syringomyelia, in all other circumstances T1 and T2 sequences are essential. Gd-DTPA is unnecessary. The results of these recommendations are illustrated.

Astrocytoma↗
PubMed1986

[Magnetic resonance tomographic findings in esophageal cancer].

The value of MRT and CT for staging and for determining operability of carcinoma of the oesophagus was assessed in 20 patients with histologically confirmed diagnoses. Both methods are limited in this respect. In some cases magnetic resonance provides more accurate concerning the extent of the tumour; this, however, is true only for lesions in the upper and middle thirds of the oesophagus. Where tumours of the distal third of the oesophagus are concerned, and particularly in those extending into the fundus of the stomach, CT is clearly superior. Both methods are of limited value in assessing the depth of tumour penetration, infiltration of neighbouring organs and involvement of regional lymph nodes.

Aged↗
PubMed1986

[Brain involvement in acquired immunodeficiency syndrome (AIDS): computed tomography (CT) and magnetic resonance tomography (MR)].

Involvement of the central nervous system in acquired immune deficiency syndrome (AIDS) is usually due to opportunistic infections; these frequently offer a difficult differential diagnostic problem. Imaging methods play an important part in the elucidation of symptoms. CT and MR findings were analysed in 13 patients with AIDS and neurological symptoms. Some infections of the central nervous system (encephalitis of unknown aetiology, cytomegalic encephalitis, meningitis) may show cerebral atrophy or even no morphological changes. Toxoplasmosis and PML are the most common opportunistic infections typical changes on CT and MR may lead to diagnosis. MR offers advantages compared with CT in its higher sensitivity for the demonstration even of small lesions.

Acquired Immunodeficiency Syndrome↗
PubMed1986

Use of surface coils in magnetic resonance imaging of orbit and knee.

Surface coils are specially designed radio-frequency receiver coils used for magnetic resonance imaging (MRI) of special anatomical regions, for instance, orbit and knee joint, with a higher spatial resolution than that obtained with conventional MRI techniques. They are designed to fit the anatomical part to be imaged, thus enabling a coil to be placed in close proximity to relevant structures. Surface coils can take these different shapes because they are only used for detecting the MR signal and thus do not need to meet particular design specifications for optimal radio-frequency homogeneity. We report our clinical experience with nearly 100 patients in the first year in the special surface-coil approach of orbit and knee joint.

Cranial Nerve Neoplasms↗
PubMed1986

[Magnetic resonance tomography in tumors of the facial bones and neck area].

32 patients with lesions of the facial skeleton, the neck and the parapharyngeal space were examined with NMR (Nuclear Magnetic Response). The results are compared with CT scanning. NMR offers high soft tissue contrast. Multiplanar imaging easily distinguishes tumours and lymph nodes from the cervical vessels and muscles. In contrast CT, is more useful for the imaging of destruction of the facial skeleton and the skull base.

Facial Bones↗
PubMed1985

[MR of the knee joint. Imaging of the normal anatomy and pathological findings using surface coils].

A special surface coil was developed with the intention of producing optimal resolution and signal-to-noise ratio for the examination of the knee joint by MRI. Eight volunteers and 25 patients with various abnormalities of the knee have been examined. Normal anatomical structures can be differentiated and there is high diagnostic reliability for lesions of the meniscus, as confirmed by arthroscopy and surgery. Cartilage lesions are less well demonstrated. Total rupture of cruciate ligaments is clearly shown, but partial rupture can often be recognised on the basis of indirect signs only. Good diagnostic results were obtained in cases of osteochondritis dissecans and chondropathia of the patella.

Adolescent↗
PubMed1985

[Possibilities of diagnosing lymphoma with MR-tomography--comparison with other imaging technics].

A retrospective study of 57 patients was made to assess the potential of magnetic resonance imaging (MRI) for demonstrating malignant lymph node disease in comparison with other imaging modalities. All patients were suspected of having lymphadenopathy in cervical, mediastinal or abdominal lymph nodes. MRI was superior in differentiating tumor involved lymph nodes from surrounding structures. On the other hand this advantage was curtailed by the spatial resolution, poorer than CT. In comparison with ultrasound MRI is the better reproducible modality and is independent of patients' constitution. Additionally MRI gives a completer overview, including retrocrural and pelvic lymph nodes. In conclusion the useful routine of ultrasonography first, completed by CT will not be changed by MRI. MRI as an additional modality is only indicated to differentiate enlarged lymph nodes from vascular structures or muscles.

Adult↗
PubMed1985

[Diagnosis of extranodal involvement of non-Hodgkin's lymphoma in the abdominal and retroperitoneal space using sonography and computed tomography].

With the advent of ultrasonography and computed tomography in the diagnosis of nodal and/or extranodal manifestation of non-Hodgkin's lymphoma (NHL) lymphomatous involvement of sites other than lymph nodes is seen with increasing frequency. - Review of patients with newly diagnosed or recurrent disease revealed 93 unusual extranodal sites below the diaphragm in peritoneal or retroperitoneal structures or organs. - Concomitant retroperitoneal and/or mesenteric adenopathy was common; extranodal involvement was rarely the only site of initial or recurrent lymphoma.

Abdominal Neoplasms↗
PubMed1985

[When is computed tomography indicated in dilatation of the retrorectal space?].

The reasonable use of computed tomography in the diagnosis of an enlarged retrorectal space was analysed in 92 cases. CT is useful in differentiation of a pathologically enlarged retrorectal space without mucosal lesions of the rectum. It enables the separation between tumourous masses, proliferation of connective tissue (in retrorectal fibrosis or inflammatory disease) and pelvic lipomatosis. If simultaneous mucosal involvement in barium enema or rectoscopy--especially in rectal carcinoma or recurrent carcinoma of the rectum- is found, CT may show the perirectal extension of tumorous masses and thus help to clarify local operability.

Colonic Diseases↗
PubMed1985

[Indications for nuclear magnetic resonance tomography in tumors of the facial skeleton and neck area].

The diagnostic value of magnetic resonance tomography is examined in relation to computed tomography on the basis of 32 patients subjected to magnetic resonance tomography who had pathological processes in the craniofacial, parapharyngeal and neck regions. The high power of contrast resolution, multiplanar imaging, and good circumscription of cervical vessels, offer advantages over computed tomography in respect of space-occupying growths in the median and lower parts of the craniofacial skull. A disadvantage is the poorer detectability of tumour-conditioned bone destruction at the base of the skull and at the facial bones; in such cases, computed tomography remains the method of choice.

Adult↗
PubMed1984

[Localization of cerebrospinal fluid fistulas with CT cisternography].

Positive CT cisternography has proved a useful method for the accurate pre-operative localisation of liquor fistulae from the skull base. In this way, planning of surgery can be improved with respect to the operative approach and the area to be covered. The risk of a recurrence is also reduced. It is necessary, however, to have a clinically recognisable leak at the time of the examination, since it is otherwise difficult to indicate the flow during the examination. We regard persistent or recurrent liquorrhoea as an indication for this examination, irrespective of its cause, provided it is intended to proceed to surgery after a positive finding. The method has few complications, is easy to perform and, in case of recurrence, can be repeated.

Adult↗
PubMed1984

[Initial findings with magnetic resonance tomography of mediastinal and hilar tumors].

Twenty-six tumours of the mediastinum and hilar regions were examined by magnetic resonance; the technique and initial experience in distinguishing normal from pathological appearances are described. ECG triggering has proved essential, whereas respiratory triggering was found to be unnecessary. Spin-echo images were found to be best for tumour delineation but, for further characterisation, the inversion recovery mode and multi-echo technique were most satisfactory. In general, the space-occupying lesion was seen as well as it would be with CT. The advantages of the new method are the excellent differentiation of vascular structures and the ability to image in multiple planes, whereas CT possesses better resolution which, in some cases, may be of diagnostic advantage.

Adult↗
PubMed1984

[Efficient procedure for diagnosing abdominal abscesses using imaging technics].

In 56 patients with abdominal abscess typical radiological abscess sings were analized to establish a rational and stepwise use of imaging procedures. Plain radiographs of the abdomen should be carried out at first because of their large diagnostic possibilities and standardized practicability. In addition with ultrasonography the diagnosis is possible in almost 90% of the cases. Contrast medium examination are rarely of diagnostic value. Computed tomography should be used in the remaining unclear cases and for planning of further surgical treatment.

Abdomen↗