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Biomedical subjects

G Friedmann

Publications and source records attributed to G Friedmann.

At least 73 records · Page 4Linked to original sources
PubMed1983

[Non-invasive diagnosis of carotid artery-cavernous sinus fistulas using computed tomography].

Typical CT-findings of carotid-cavernous sinus fistulas are asymmetric enlargement and bulging of the lateral contours of the cavernous sinus and dilatation of draining orbital and facial veins. They can be best demonstrated with thin-section scans and rapid intravenous bolus injection of contrast agent. Among the differential diagnoses, a variety of orbital, intrasellar and parasellar lesions must be considered. For definitive radiologic diagnosis cerebral angiography continues to be required.

Adult↗
PubMed1983

[Computed tomography in space-occupying intraspinal processes].

Spinal computed tomography has considerably enhanced differential diagnostic safety in the course of the past two years. It has disclosed new possibilities of indication in the diagnosis of the vertebral column. With the expected improvement in apparatus technology, computed tomography will increasingly replace invasive examination methods. Detailed knowledge of clinical data, classification of the neurological findings, and localisation of the height--as far as possible--are the necessary prerequisites of successful diagnosis. If they are absent, it is recommended to perform myelography followed by secondary CT-myelography. If these preliminary conditions are observed, spinal CT can make outstanding contributions to the diagnosis of slipped disk, of the constricted vertebral canal, as well as tumours, malformations and posttraumatic conditions, postoperative changes and inflammatory processes.

Calcinosis↗
PubMed1983

[Radiologic diagnosis of malignant peripheral soft tissue tumors].

In malignant soft-tissue tumors of the extremities the radiologist is asked to define size and extent of the lesion and it's relationship to adjacent structures. The assessment of the nature of the lesion is of utmost importance, however, the contribution of the different imaging modalities varies considerably. In a review article the current roles of conventional radiography, xeroradiography, real-time ultrasonography, computed tomography and arteriography in the diagnostic workup of malignant soft-tissue tumors of the extremities are discussed. The statements made are based upon own comparative studies as well as on a review of the literature. In the assessment of the nature of a soft-tissue mass the contribution of all radiologic imaging methods is rather limited, although arteriography may add valuable information if performed complementary to CT. Real-time ultrasonography is well suited to define size, location and extent of peripheral soft-tissue masses. It is therefore recommended as the first imaging method and for follow-up studies. Equivocal findings by real-time sonography and new cases for treatment planning must be confirmed by computed tomography which proved to be the most reliable and the best reproducible imaging method for soft-tissue tumors of the extremities.

Adult↗
PubMed1983

[CT diagnosis of mucoceles].

The article describes on the basis of the authors' own 12 cases the typical CT pattern of mucoceles of the paranasal sinuses--intrasinusoidal space-occupying growths with central density values of 20-25 HE, expansive displacement of the adjacent walls. Attention is drawn to the special factors due to the localization, which are different for various paranasal sinuses. Conventional tomography can be omitted in future.

Adult↗
PubMed1983

[Surgically verified CT findings after previous lumbar discotomy].

Our experience has shown that computed tomography is superior to myelography as a diagnostic tool after lumbar discotomy. Provided the examination is carried out correctly, CT has always supplied a precise anatomic diagnosis in cases where the myelogram was ambiguous. In particular, it was possible to differentiate between discogenic, cicatrized, haematoma-conditioned and osseous compression. However, two facts have to be reiterated: 1. The reference method in the cases under report was exclusively the surgical finding, representing a relatively clearly defined part of the patient material. 2. It goes without saying that the indication for a repeat operation must be based on the clinical findings as well.

Adult↗
PubMed1982

[First clinical experiences with a new large frame intensifier in thoracic diagnosis].

In 350 patients with 870 pathologic findings comparative blind analysis of conventional chest films and biplane 100 mm photofluorographic images taken with the large-field image intensifier revealed high accuracy in the evaluation of coin lesions, hilar and pleural pathology, pulmonary vasculature and the right paratracheal stripe. Moderate central interstitial edema, more subtle interstitial changes particularly in the lung periphery including Kerley's B-lines, and calcifications in the hilum or the aortic arch are not visible in all cases for the evaluation of lesions of the ribs special films continue to be mandatory. Lateral views are of good quality. The spatial resolution of the large-field image intensifier was measured to be 4.5-5.2 LP/mm at the output phosphor, the spatial resolution of the 100 mm intensified images ranges from 2.6-3.8 LP/mm in the center. Mean skin dose was found to be 6.3 mrd in the p.a. projection which is less than 5% of the values registered in non-intensified photofluorography and even by factor 5 lower than in conventional chest x-ray using rare earth screens.

Adult↗
PubMed1982

[Technique of application of contrast media in computed tomography of the heart (author's transl)].

Cardiac imaging by means of CT requires administration of intravenous contrast medium which can be applied by infusion or by rapid bolus injection. Contrast infusion is easier in performance and yields opacification of all cardiac cavities. Using bolus technique selective enhancement of cardiac chambers can be obtained which provides increased image quality and better resolution of cardiac structures. Both techniques are described and the results of 221 examinations are analysed with special respect to image quality, technical amount and contrast media side effects.

Contrast Media↗
PubMed1982

CT examination of the spine and the spinal canal.

Analogous to its other fields of application, CT of the spine and the spinal canal has also already achieved a permanent place among the diagnostic methods. Numerically, CT studies of the cervical, thoracic and lumbar spine for our patient population with a total of 460 examinations are in the ratio 2: 1: 4.5. The essential advantages are improved differential diagnosis for many processes, the exact breakdown of the degree of extraspinal and intraspinal involvement in the change, the increasing limitation of myelography and last but not least the possibility of reducing cost.

Adolescent↗
PubMed1982

[Idiopathic megacolon (author's transl)].

The diagnosis of congenital megacolon can only rarely be established in adult cases with dilatation of the rectum and sigma, since the narrow aganglionic segment and increased levels of plasma acetylcholinesterase activity are usually lacking in adult cases,--these findings being typical for congenital megacolon. Idiopathic megacolon thus is the correct diagnosis in most of these adult cases. Surgical removal of the dilated parts of the intestine and end-to-end anastomosis yield satisfactory results, thus a colostomy is not necessary.

Adult↗