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Biomedical subjects

H St Stender

Publications and source records attributed to H St Stender.

13 recordsLinked to original sources
PubMed1995

[Quality criteria in diagnostic radiology, goals and reality].

Quality criteria describe the medical standards (guidelines) with respect to the different aspects of radiological diagnosis. The indication does not seem to be justified in 20-50% of studies. Indication lists should be developed. Image quality has generally improved--with the exclusion of barium studies of the gastrointestinal tract. In 60% of patient studies, radiation exposure has been lowered to 25% due to the use of low-dose film-screen systems (speed class 400), higher exposure voltages, and improved constancy of the technical equipment. Over the last years diagnostically valuable computed tomography studies have been performed with considerably higher organs and effective doses. Technical restrictions in this field are necessary without compromising the diagnostic information. The benefit-risk ratio underscores the fact that the diagnostic and therapeutic benefit for the patient exceeds the nominal stochastic radiation risk by several orders of magnitude.

Humans↗
PubMed1982

[Procedure and purpose of thoracic radiology (author's transl)].

X-ray investigations of patients with symptoms of thoracical illness require the posterior-anterior and the lateral projections as well. The lateral projection is not necessary for routine screening examinations of patients younger than 40 years. Fluoroscopy is used in appropriately one third of the patients to clarify or to bring additional information to the diagnosis. X-rays taken in inspiration and exspiration help to disclose malfunctions in breathing of one or both lungs. X-rays taken with the patient lying on his side and with the X-ray beam centered horizontally provide an improved viewing of small basal pleural effusions and the mobility of mediastinum. An X-ray technique of high quality is needed to obtain important parameters for the diagnosis. Analysis of the X-ray picture must be carried out systemetically. Applied knowledge of clinical data raises the number of correct-positive and incorrect-positive observations. Repeated analysis by the same observer or group observations leads to an increase in the reliability of the diagnosis.

Carcinoma, Bronchogenic↗
PubMed1979

[Small pulmonary nodular opacities in inflammatory and granulomatous lung disease (author's transl)].

Small pulmonary nodular opacities are usually visible only due to the summation of several small foci. The size of a single focus and its number per area determine their radiographic appearance either that of small nodular lesions, or of a reticular pattern or of diffus opacification. The small nodular pattern is primarily observed in lung disease beginning in the interstitium rather than the alveoli. Pattern and course of small nodular lung lesions give important differential diagnostic clues.

Alveolitis, Extrinsic Allergic↗
PubMed1979

[Misinterpretation of chest roentgenogram in intensive care patients (author's transl)].

Misinterpretation of chest roentgenograms in intensive care patients can be largely obviated by a skilled technique and a thorough knowledge on the part of the radiologist of the structural changes in the lungs and their differential diagnostic significance. Correct interpretation is facilitated by relating the observed changes to the pathophysiological clinical findings.

Humans↗
PubMed1978

[Inflammatory pulmonary lesions: resolutions and residuals (author's transl)].

There are different patterns of development and resolution of inflammatory alveolar and interstitial pulmonary lesions. Delayed resolution of peripheral pneumonia results in lung shrinkage mainly towards the mediastinum and the apices with distortion and atypical distribution of pulmonary vasculature and compensatory hyperinflation. Resolution in perivascular and peribronchial parts is often delayed and results in scarring. Interstitial pneumonia may result directly in pulmonary fibrosis with loss of volume and honeycombing. With varying microorganisms and varying immunity chronic and atypical courses are observed more frequently.

Alveolitis, Extrinsic Allergic↗
PubMed1976

[The radiological findings in oesophagitis due to Crohn's disease (author's transl)].

The radiological changes in oesophagitis due to Crohn's disease are described in five patients. Like the pathological and anatomical findings, the appearances proved very variable. Neither in our own observations, nor in the literature, are there any radiological findings which are diagnostic. The diagnosis can only be made on the basis of radiological, endoscopic and histological findings.

Adult↗
PubMed1976

[Xeroradiography and its value in the diagnosis of chondrocalcinosis (author's transl)].

Conventional x-ray and xeroradiographic technique were compared in a modified blind study in order to evaluate its efficiency to detect calcifications of the cartilage. Using both techniques knees, hands, and pelvic joints were examined in 16 patients with proven chondrocalcinosis. Three different radiologists evaluated radiological films and xeroradiograms independently. Their results were classified in correct, false negative, and false positive groups. All examiners achieved the best results with xeroradiography. Due to special characteristic features in xeroradiography even fine calcifications were recognized in most cases. By this method the "false negative" results were reduced to almost zero. On the other hand, the twenty percent "false positive" results in conventional radiological technique was eliminated by xeroradiography.

Chondrocalcinosis↗