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Biomedical subjects

T Franken

Publications and source records attributed to T Franken.

At least 37 records · Page 2Linked to original sources
PubMed1982

[Direct radiological magnification of thin objects compared with contact exposures and mammographic techniques (author's transl)].

Image quality of phantom objects examined by direct radiographic magnification was analysed. The following results were obtained. Improvement in image quality by direct x 2 magnification of fine, but contrasted, details is very limited. Contact examination using suitable imaging systems provides images of equal quality. Course detail with poor contrast is poorly rendered by direct radiographic magnification. Mammographic techniques are better suited for this purpose. Exposures, using mammographic techniques, produce the same dose rates as direct magnification. In view of the improved image quality, this method is therefore to be preferred. It also appears that the dose rate for comparable image quality for different techniques (direct magnification, mammography, contact exposures) is approximately the same.

Bone and Bones↗
PubMed1982

[Mammographically distinguishable parenchymal patterns and their significance in estimating breast cancer risk].

A retrospective study of the mammograms of 11020 women was carried out; amongst these, 490 had carcinomas, including 51 so-called interval carcinomas. An attempt was made to test the suggestion advanced by Wolfe that certain dense types of parenchymal pattern on the mammogram are associated with a significantly increased carcinoma risk. We were unable to confirm Wolfe's suggestion. There is a slightly higher risk for pattern P2-DY, which cannot be used as the basis for future management of the patient. Attention is drawn to the risk of missing many carcinomas of the breast, if the suggestions made by Wolfe are followed.

Breast Neoplasms↗
PubMed1980

[Image quality from direct radiological magnification (author's transl)].

An assessment of image quality from a direct radiological magnification method with a microfocus was carried out. It was found that direct magnification has advantages for the magnification of thin objects (5 cm. thickness). Because of the marked radiation scarrer in thick objects an improvement in picture quality is not possible. Scatter, despite the Groedel effect, is too large. Optimum results are obtained with a microfocus tube using universal screens. Comparable image quality is not possible with high intensification screens. High definition screens are not suitable for magnification. Dose measurements revealed unexpectedly low levels, particularly for thin objects. The reasons for this were examined and are described.

Evaluation Studies as Topic↗
PubMed1980

[Mulitple primary carcinomas.--Analysis and discussion of 74 cases (author's transl)].

This study is based on the examination of 3132 patients. 74 of these patients (2,6%) had clearly demonstrated multiple tumors. Most of them were located in the mamma, the female sex organs, the oral cavity and the pharynx as well as in the lymphatic and hematopoietic organs. A significantly greater risk to develop secondary carcinomas was found in patients suffering from primary mamma carcinomas. A correlation with other tumors of the female sex organs can also be supposed. In case of other malignant tumors, it was not possible to demonstrate any tendency to form secondary carcinomas. Important informations about pathogenesis and etiology of carcinomas can be obtained by the performance of detailed examinations which have to be based on reliable statistical methods.

Breast Neoplasms↗
PubMed1979

[The treatment of idiopathic varicocoeles by transfemoral spiral occlusion of the left testicular vein (author's transl)].

The standard surgical procedures for the treatment of idiopathic varicocoeles are unsuccessful in, or show a recurrence rate of, up to 25%. An alternative method is transcutaneous embolisation using the Seldinger catheter technique. For this technique of transcutaneous catheter embolization, we have used the Gianturco spiral. The embolization is carried out following diagnostic transfemoral phlebography of the left testicular vein, which also provides the indications or contra-indications for this procedure. The method has been used on nineteen patients with varicocoeles requiring treatment; amonst these were three patients who had had unsuccessful operations. Follow-up period so far is six months. In all cases the varicocoele had disappeared, including one patient who had suffered complications following previous surgery.

Embolization, Therapeutic↗
PubMed1979

[Disease of metalgrinding workers (author's transl)].

It is a specific clinical picture with extensive soft tissue gas and swelling of the forearm. Usually, the clinical course is without any other symptoms. Therapy is not necessary because gas disappears in few days. The etiology of the disease is not clear. Gas can be generated by the chemical reaction between a metallic foreign body and tissue fluid. Spread of benzine evaporation has been considered as a possible source as well. The disease is very rare and its knowledge is important in differential diagnosis of gas gangrene.

Adult↗
PubMed1979

[Pneumoperitoneum induced by artificial respiration and its diagnosis by peritonel lavage (author's transl)].

Ventilation with increased end-exspiratory pressure may, especially in cases of blunt chest trauma, result in pneumoperitoneum although there are no intestinal injuries. The case histories of four persons who developed this complication are reviewed. Differentiation between such a complication and a condition requiring laparotomy is often difficult because other injuries, particularly a cerebrocranial trauma, may obscure the clinical symptoms. Diagnostic peritoneal lavage may help towards differentiating between a ventilation-induced pneumoperitoneum and an "acute abdomen" caused by perforation or rupture of an intra-abdominal hallow organ.

Accidents, Traffic↗
PubMed1979

[X-ray equipment for standardized diagnostic radiology in intensive care units (author's transl)].

The increasing demands made by intensive care medicine on chest and abdominal radiography and on angiography have created the need for new X-ray equipment that combines short exposure with high tension. Battery-operated medium-frequency generators have an adequate output to satisfy these demands. For visualizing peripheral vessels in intensive care patients xeroradiographic arteriography has proved its value.

Angiography↗
PubMed1978

[Endoscopic transpapillary splitting of a choledochocele (author's transl)].

A choledochocele with obstruction to outflow from the biliary and pancreatic duct systems was diagnosed by endoscopic retrograde cholangio-pancreatography in a 67-year-old man with radiating upper-abdominal pain and constantly elevated gamma-glutamyl transferase. After distension of the choledochocele with contrast medium a papillotome was introduced across the papilla and the choledochocele was split open. There were no complications and flow from both systems became normal. The symptoms disappeared and the patient required neither anaesthesia nor an abdominal operation.

Aged↗
PubMed1978

[The value of radiographic examinations of the thorax in acute myocardial infarction (author's transl)].

The degree of pulmonary congestion seen on chest radiographs taken in the intensive care unit was compared with the end-diastolic pulmonary artery pressure in 65 patients with recent transmural myocardial infarcts without cardiogenic shock. There was good correlation between the radiographic appearances and the end-diatrolic pulmonary artery pressure, so that the severity of left heart insufficiency could be diagnosed radiologically at an early stage. Errors were due to the time interval which must pass before the radiographic appearances approximate the haemodynamic changes. This resulted in a diagnostic "phase lag" (following a rise in end-diastolic pulmonary artery pressure) or in a post-therapeutic "phase lag" (after a fall in end-diastolic pulmonary artery pressure). Repeated examinations allow one to recognize changes in the haemodynamics. One should pay particular attention to the features of pulmonary venous and pulmonary arterial hy

Acute Disease↗
PubMed1978

[Roentgen diagnosis of injuries of the ankle joint (author's transl)].

Lesions of the ankle joint affect the bone and/or ligaments. It will often be necessary to conduct additional radiological examinations besides the standard x-ray films. These additional examinations should include: 1. roentgenograms taken at an oblique angle; 2. x-ray films taken in forced extreme joint position in two planes; 3. roentgenograms comparing right and left; 4. arthrography. The article discusses the value and significance of the additional roentgenograms, with particular reference to the importance of the films of the forced extreme joint position.

Ankle Injuries↗
PubMed1978

[Transarferial xero-arteriography--an alternative method in conventional angiography of the extremities (author's transl)].

The technique of transarterial xeroarteriography and its results are presented. The range of indication of transarterial xero-arteriography is the demonstration of localised vascular sections of the arteries of the extremities. The advantages are, above all, the simple and less hazardous examination technique, the possibility of examination on an outpatient basis, examination despite anticoagulant therapy, and especially of examining bedridden patients eg in the ward. Drawbacks are: The limited format of the xerox cassettes, the relative sensitivity of the cassettes, and extinction phenomena occurring during the xeroradiography.

Adult↗
PubMed1978

[Direct antegrade cholangiography and percutaneous transhepatic drainage of the biliary tract (author's transl)].

Direct antegrade cholangiography via transjugular access or as transcutaneous, transhepatic fine-needle cholangiography reduces the examination risk involved in the direct visualisation of the bile duct via needles of thick calibre. The article reports on the results obtained with 83 patients. Direct puncture of the bile duct by means of a fine needle is superior to transjugular antegrade cholangiography in respect of the required technical equipment and cost, and also as far as the proportion of accurate results is concerned, since visualisation of cholangiectasis will always be successful, whereas the visualisation of undilatated bile ducts can be effected in 50% of the examinations. Transvenous access should be chosen in such cases where liver tissue biopsy is necessary. Dilatation of the transcutaneous, transhepatic bile duct access via the temporary transcutaneous, transhepatic bile duct drainage, is necessary in those situations where the bile flow cannot be ensured by surgery, or where surgery is ruled out on account of the patient's general condition.

Bile Ducts↗
PubMed1977

[Xero-radiographic examination of the capsule and ligaments of the knee joint. II. Demonstration of injuries to the cruciate and lateral ligaments and menisci (author's transl)].

The value of xero-radiography for demonstrating injuries to the capsule and ligaments of the knee has been investigated. A tomographic method was used in conjunction with arthrography of the knee. The results have shown that, in vitro, injuries of the cruciate and lateral ligaments and of the capsule are well shown by xero-tomography and that it is possible to evaluate their extent. Simultaneous demonstration of injuries to the menisci is less certain. In order to show these accurately, special methods would have to be employed. Despite the higher radiation dose which must be expected, and the greater complexity of this technique, we consider that a clinical investigation of the method is indicated.

Cartilage, Articular↗