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Biomedical subjects

K Turetschek

Publications and source records attributed to K Turetschek.

At least 37 records · Page 2Linked to original sources
PubMed2000

Early pulmonary involvement in ankylosing spondylitis: assessment with thin-section CT.

AIM: To determine the frequency and the distribution of early pulmonary lesions in patients with ankylosing spondylitis (AS) and a normal chest X-ray on thin-section CT and to correlate the CT findings with the results of pulmonary function tests and clinical data. MATERIALS AND METHODS: Twenty-five patients with clinically proven AS and no history of smoking underwent clinical examinations, pulmonary function tests (PFT), chest radiography, and thin-section CT. Four of 25 patients (16%), who had obvious signs on plain films suggestive of pre-existing disorders unrelated to AS were excluded. RESULTS: Fifteen of 21 patients (71%) had abnormalities on thin-section CT. The most frequent abnormalities were thickening of the interlobular septa in seven of 21 patients (33%), mild bronchial wall thickening in (6/21, 29%), pleural thickening and pleuropulmonary irregularities (both 29%) and linear septal thickening (6/21, 29%). In six patients there were no signs of pleuropulmonary involvement. Eight of 15 patients (53%) with abnormal and four of six patients (67%) with normal CT findings revealed mild restrictive lung function impairment. CONCLUSION: Patients with AS but a normal chest radiograph frequently have abnormalities on thin-section CT. As these abnormalities are usually subtle and their extent does not correlate with functional and clinical data, the overall routine impact of thin-section CT in the diagnosis of AS is limited.

Adult↗
PubMed2000

CT and MR imaging of generalized cystic lymphangiomatosis in pediatric patients.

OBJECTIVE: The aim of this study was to describe the spectrum of abnormalities seen in generalized cystic lymphangiomatosis as shown by CT and MR imaging and to correlate these findings to gross pathology. CONCLUSION: MR imaging and CT may substantially broaden visualization of the spectrum of abnormalities seen in generalized cystic lymphangiomatosis by revealing the complete extent of disease and, thus, may contribute to clinical management of the disease by preventing initial misdiagnosis.

Child↗
PubMed1999

Amplitude-coded color doppler: clinical applications.

Amplitude-coded color Doppler sonography (ACD) has become an useful adjunct to gray-scale US and conventional color Doppler sonography (CD) for the assessment of vascular diseases and pathologic conditions that might affect or alter tissue vascularization or perfusion. Basically, all US units that generate conventional color Doppler information through autocorrelation technique are capable of displaying ACD. This technique is also referred to as power Doppler, amplitude-mode color Doppler US, color Doppler energy (CDE), or US angiography. Amplitude-coded color Doppler sonography has already emerged as a valuable adjunct to conventional CD, particularly for evaluating flow in parts of the body where CD signal is weak because of slow flow, small blood vessels, or both.

Blood Flow Velocity↗
PubMed1999

World Wide Web and Internet: applications for radiologists.

Global exchange of information is one of the major sources of scientific progress in medicine. For management of the rapidly growing body of medical information, computers and their applications have become an indispensable scientific tool. Approximately 36 million computer users are part of a worldwide network called the Internet or "information highway" and have created a new infrastructure to promote rapid and efficient access to medical, and thus also to radiological, information. With the establishment of the World Wide Web (WWW) by a consortium of computer users who used a standardized, nonproprietary syntax termed HyperText Markup Language (HTML) for composing documents, it has become possible to provide interactive multimedia presentations to a wide audience. The extensive use of images in radiology makes education, worldwide consultation (review) and scientific presentation via the Internet a major beneficiary of this technical development. This is possible, since both information (text) as well as medical images can be transported via the Internet. Presently, the Internet offers an extensive database for radiologists. Since many radiologists and physicians have to be considered "Internet novices" and, hence, cannot yet avail themselves of the broad spectrum of the Internet, the aim of this article is to present a general introduction to the WWW/Internet and its applications for radiologists. All Internet sites mentioned in this article can be found at the following Internet address: http://www.univie.ac. at/radio/radio.html (Department of Radiology, University of Vienna)

Humans↗
PubMed1999

Discrimination between fluid, synovium, and cartilage in patients with rheumatoid arthritis: contrast enhanced Spin Echo versus non-contrast-enhanced fat-suppressed Gradient Echo MR imaging.

PURPOSE: The aim of this study was to compare fat-suppressed T1-weighted 3D-Gradient Echo (GE)-images and conventional T1-weighted contrast-enhanced SE images in the assessment of patients with rheumatoid arthritis in an attempt to improve discrimination of inflamed synovium, joint fluid, and cartilage. PATIENTS AND METHODS: 28 knee joints in 20 patients with rheumatoid arthritis were examined with a 3 D-GE-T1 weighted sequence with frequency-selective fat suppression (Flash 3D fat sat) and T1-weighted SE-sequences after intravenous gadolinium-containing contrast agent administration using a 1.5T system. Differentiation of cartilage, synovium, and joint effusion was assessed on both sequences qualitatively by two observers and quantitatively by signal intensity measurements. RESULTS: Qualititative analysis revealed higher grading rates for cartilage/fluid differentiation with fat-suppressed T1-weighted GE images than contrast enhanced T1-SE images. Quantitative analysis by measurements of contrast-to-noise ratios revealed significantly higher rates for the Flash 3D fat sat with regard to cartilage/fluid discrimination, significantly higher rates for T1-SE post-contrast for cartilage/synovium discrimination, and significantly higher rates for T1-SE post-contrast for synovium/fluid discrimination. CONCLUSION: 3D-GE-imaging with fat-suppressed T1 weighted sequences allows sufficient differentiation of cartilage and joint fluid in patients with rheumatoid arthritis without application of contrast agents and may assist in monitoring disease progression and response to therapy. The higher contrast to noise ratios of cartilage/synovium and synovium/fluid on T1-SE images following administration of gadolinium-containing contrast agents may improve detection of disease activity.

Adult↗
PubMed1999

Comparison of low field (0.2T) and high field (1.5T) MR imaging in the differentiation of torned from intact menisci.

PURPOSE: To evaluate the usefulness of a low field MRI system (0.2T; Esaote, Biomedica) for the evaluation of meniscal tears with regard to anatomic site, and to compare the results with findings from a high field unit (1.5T; Siemens, Erlangen). MATERIAL AND METHODS: MRI was performed in 25 patients in a low field (0.2T; Esaote, Biomedica), and a high field (1.5T; Siemens, Erlangen) MRI unit. The images were analyzed for the presence or absence of meniscal tears and the confidence of decision making. Results were further analyzed for the number of identical and unidentical findings on both imaging modalities. In seven patients, arthroscopy was performed and the findings compared with the results from MR imaging. Statistical analysis was performed by chi 2-test, Wilcoxon test and Friedman analysis. RESULTS: Qualitative evaluation of the level of confidence in decision making was significantly superior on high field strength images. When comparing the evaluations from both image modalities in 21 of 25 patients (84%), the diagnosis concerning the presence or absence of meniscal tears was identical. CONCLUSION: Although low field MR imaging might offer diagnostic potential concerning the presence or absence of meniscal tears, the level of confidence in decision making is significantly superior with high field strength imaging, probably reflecting the higher conspicuity of lesions from high field strength units.

Adult↗
PubMed1999

Thoracic venous anatomy delineated by malpositioned central venous catheters on plain chest films.

The aim of this essay was to demonstrate the thoracic venous anatomy as delineated by malpositioned central venous catheters on plain chest radiographs. We therefore used the didactic advantage of clinically inadvertent catheter positions. This approach was chosen to illustrate venous anatomy with plain chest radiographs, and, thereby, to recognize malpositions promptly on the modality with which positions of central venous catheters is routinely performed.

Catheterization, Central Venous↗
PubMed1999

Transabdominal bowel sonography for the detection of intestinal complications in Crohn's disease.

BACKGROUND: The course of Crohn's disease is characterised by the occurrence of intestinal complications such as strictures, intra-abdominal fistulas, or abscesses. Standard diagnostic procedures may fail to show these complications, in particular fistulas. AIMS: To test the value of transabdominal bowel sonography (T) for the detection of intestinal complications in Crohn's disease. METHODS: T was prospectively performed in 213 patients with Crohn's disease in a university based inflammatory bowel disease referral centre. Thirty three underwent resective bowel surgery and were included in this study. The accuracy of T to detect strictures, intra-abdominal fistulas, or abscesses was compared with surgical and pathological findings. RESULTS: T was able to identify strictures in 22/22 patients and to exclude it in 10/11 patients (100% sensitivity, 91% specificity). Fistulas were correctly identified in 20/23 patients and excluded in 9/10 patients (87% sensitivity, 90% specificity). Intra-abdominal abscesses were correctly detected in 9/9 patients and excluded in 22/24 patients (100% sensitivity, 92% specificity). CONCLUSIONS: In experienced hands T is an accurate method for the detection of intestinal complications in Crohn's disease. T is thus recommended as a primary investigative method for evaluation of severe Crohn's disease.

Abdominal Abscess↗
PubMed1998

[Radiologic evaluation of Crohn disease].

PURPOSE: This paper discusses the role of different imaging modalities in the diagnostic work-up of Crohn's disease (CD). METHODS: We present a concept, which emphasizes different diagnostic aspects with regard to primary diagnosis, follow-up and assessment of complications of CD. The most effective imaging approach to various diagnostic problems of CD is discussed in detail. DISCUSSION: With regard to the primary diagnosis barium studies should contribute to differentiate between CD and ulcerative colitis. Beyond that, these studies should evaluate location and extent of disease. During the follow-up bowel sonography provides staging of disease and enables the detection of complications at an early stage. CT is a valuable tool in the preoperative assessment of complications, such as fistulae and abscesses.

Barium Sulfate↗
PubMed1998

[Stroboscopy and imaging in interdisciplinary diagnosis of early stages of laryngeal carcinoma].

The laryngostroboscopy is regarded to be the most important functional investigation in laryngologic and phoniatric diagnostics. She allows an analysis of vocal fold vibrations during phonation. Stroboscopic evaluations permit to early detect infiltrative processes of the vocal folds. Superficial alterations of the mucous membrane that invade into the muscle cause a phonatory "standstill" of the vocal fold in the stroboscopy, i.e. a complete lack of vibratory motion. If such a phonatory standstill persists for more than 2 or 3 weeks, a biopsy via microlaryngoscopy is indicated for diagnostic purposes. In comparison to stroboscopy, imaging techniques are not of such great significance in early laryngeal cancer. But in case of suspected infiltration of the tumor a further diagnostic evaluation with CT or MRI is necessary to detect possible neoplastic invasion of the laryngeal cartilage or of extralaryngeal structures. In this paper, we present the principle of laryngostroboscopy, the examination procedure and the stroboscopic parameters. Case reports of early laryngeal cancer illustrate the interdisciplinary diagnostic procedure with CT, MRI and stroboscopy.

Adult↗
PubMed1998

[Preoperative imaging of varicose veins of the lower extremities. Classical pattern of insufficiency and its clinical use].

UNLABELLED: Venous varicose are one of the most common diseases in industrial countries today. New surgical strategies, tailored to a patient's specific pattern of venous incompetence require more detailed preoperative imaging. METHODS: In this review of current literature we analyzed the value of ascending venography, color coded duplex sonography and descending venography for preoperative planning of varicose surgery. On the other hand, we describe variant anatomy of the superficial venous system like the different levels of escape points and perforating veins. RESULTS: Ascending venography and color coded duplex sonography are both excellent modalities for detection of reflux in the saphenofemoral and saphenopopliteal junction. The results of current literature indicate, that ascending venography is superior to color coded duplex sonography in the detection of incompetent perforators. CONCLUSIONS: Ascending venography and color coded duplex sonography provide improved information, that may be crucial for surgical planning. The high heterogeneity and broad distribution of valvular incompetence confirms the importance of detailed preoperative imaging.

Chronic Disease↗
PubMed1998

[CT-phlebography. A new method for the diagnosis of venous thrombosis of the upper and lower extremities].

UNLABELLED: Spiral CT venography is a new method in vascular imaging, which is an accurate tool for the evaluation of deep venous thrombosis in the evaluation of deep venous thrombosis in the lower and upper extremity. MATERIALS AND METHODS: 102 lower extremities and 12 upper extremities were evaluated for deep vein thrombosis using spiral-CT-venography. The results were compared with findings of ascending venography, color coded duplex sonography and clinical follow up. RESULTS: Spiral CT venography of the lower extremity showed a sensitivity of 100% and a specifity of 96%. The quality of venous opacification with CT venography compared with ascending venography was superior in all venous segments. DISCUSSION: Spiral CT venography is a valuable tool for the detection of deep venous thrombosis. Advantages of the method are the reduction of the amount of contrast material necessary for opacification and the detection of perivascular soft tissue alterations. The application of CT venography is limited due to higher costs and radiation dosage.

Cost-Benefit Analysis↗
PubMed1998

[Trauma of the facial bones and skull].

Facial trauma is frequent and mainly caused by motor vehicle accidents. Due to this main etiologic factor, trauma to the facial skeleton is often associated with serious injuries, commonly involving the brain, chest or abdomen. As a consequence, the initial clinical management of these patients includes control of hemorrhage and immediate assessment of life-threatening injuries, including the maintenance of the airways. Patients presenting with facial trauma are initially evaluated with a systematic clinical examination because many fractures can be accurately diagnosed by inspection and palpation alone. In these cases plain film radiographs serve only for confirmation and documentation of the diagnosis. In many other cases accompanying and extensive soft tissue swelling may clinically obscure fractures. A complete and accurate evaluation of these patients requires additional radiological imaging methods. A series of plain films may be generally sufficient but in most of the cases they can be regarded as initial screening methods for more thorough diagnosis with computed tomography (CT). In trauma patients CT is the imaging method of choice because it shows more fracture lines and displaced fragments than any other imaging modality. CT delineates soft tissue and bony structures and can localize and even characterize foreign bodies. A complete and accurate characterization of the fracture type and potentially associated complications in mandatory for the appropriate treatment and can only be achieved by careful radiological (CT) evaluation.

Craniocerebral Trauma↗
PubMed1998

Amplitude-coded colour Doppler sonography: physical principles and technique.

The purpose of this review is to help in understanding the principles of a new ultrasound Doppler technique called amplitude-coded colour Doppler (power) mode. All pertinent information available in the literature on the physical principles of this technique has been revised in order to give a detailed survey. The main components and the key characteristics of this mode are discussed together with illustrative examples. In addition, work-in-progress developments and other future aspects of US imaging in combination with this technique are discussed.

Algorithms↗
PubMed1998

Double inversion recovery imaging of the brain: initial experience and comparison with fluid attenuated inversion recovery imaging.

The purpose of this study was to evaluate the diagnostic efficacy of the double inversion recovery fast spin echo (DIR-FSE) sequence for brain imaging compared to the fluid-attenuated inversion recovery (FLAIR) sequence. DIR-FSE and FLAIR-FSE sequences were obtained and compared side by side. Image assessment criteria included lesion conspicuity, contrast between different types of normal tissue, image quality, and artifacts. In addition, contrast ratios and contrast-to-noise ratios were determined. Scan time of DIR-FSE was 33% longer than scan time of FLAIR-FSE. Overall lesion conspicuity was equal on DIR-FSE and FLAIR-FSE; however, DIR-FSE showed particular advantages for infratentorial lesions and lesions with only poor contrast on T2-weighted images, whereas FLAIR was slightly superior for small superficial cerebral abnormalities. Gray-white differentiation was better with DIR-FSE. Cerebrospinal fluid suppression was equal on both sequences; cerebrospinal fluid pulsation artifacts were more pronounced on DIR-FSE but did not cause diagnostic difficulties on these images. We conclude that DIR-FSE might be obtained if infratentorial lesions and abnormalities with only slightly prolonged T2 relaxation times are suspected. Otherwise, FLAIR-FSE seems preferable.

Adolescent↗
PubMed1998

Conflicting results of ileoscopy and small bowel double-contrast barium examination in patients with Crohn's disease.

BACKGROUND AND STUDY AIMS: Ileoscopy has become a routine procedure for the diagnosis of Crohn's disease of the terminal ileum. The aim of this study was to compare the diagnostic accuracy of small bowel barium examination with that of ileoscopy. PATIENTS AND METHODS: In a retrospective study the two methods were compared in 55 patients with Crohn's disease. First, routine radiology reports and second, reevaluation of the small bowel barium study by gastrointestinal radiologists with scoring of examination quality were compared with the results of ileoscopy. RESULTS: Using routine radiology reports, 66% sensitivity and 82% specificity were reached for inflammatory changes of the terminal ileum by small bowel barium study. Sensitivity and specificity increased to 68% and 91% with double reading by experienced radiologists. Disagreement between endoscopic and radiologic results changed from 31% to 27% and were mainly because of false-negative barium studies. Sensitivity and specificity of barium studies were influenced by the quality of the examination with a sensitivity of 91% and specificity of 100% when the quality was good. CONCLUSIONS: In patients in whom the terminal ileum is successfully intubated, ileoscopy is superior to barium examination in the evaluation of Crohn's disease of the terminal ileum. Results of the barium study were strongly influenced by the quality of the examination.

Adolescent↗