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Biomedical subjects

A Stöger

Publications and source records attributed to A Stöger.

16 recordsLinked to original sources
PubMed2006

[Muscle and tendon injuries of the knee joint].

Muscles and tendons contribute greatly to stabilization of the knee joint and are crucial elements for normal joint function. Therefore, injuries of those structures cause variable degrees of disability, depending on the severity of the lesion. Due to the characteristic structural changes and alterations of signal intensities, MR imaging allows accurate identification and staging of acute injuries of muscles and tendons, as well as assessment of chronic or degenerative disease. The knowledge of anatomy and normal function of muscles and tendons, together with a thorough understanding of the mechanism and usual combinations of their injuries (e.g., posterolateral structures) allows an exact evaluation of injury-induced functional impairments to the knee joint. A detailed and exact radiological report is of the greatest importance for the referring clinician and the patient to determine optimal therapeutic strategies.

Humans↗
PubMed2006

[MRI after meniscus and cruciate ligament surgery].

Nowadays, due to its high diagnostic accuracy, MR imaging is the method of choice for the evaluation of knee joint disorders pre- and postoperatively. Accurate diagnosis is sometimes possible only if the reporting radiologist has knowledge of the therapeutic procedures and the surgical report. Frequently, further therapeutic management is strongly influenced by MR examinations and radiological reports.

Anterior Cruciate Ligament↗
PubMed1999

[Tibial growth after isolated femoral shaft fracture in the growth stage].

The aim of the present study is to investigate the growth of the tibia after femoral shaft fractures in children. We were able to follow up 44 patients (32 male and 12 female) after a mean of 8 years (range, 5 to 15 years). The age in the time of injury was 3 till 13 years (mean 7 years). The length of the femur, tibia and leg was measured on X-rays of the entire leg, and the measurements were compared with the contralateral side. A statistically significant number of tibial elongations were observed in fractures that had healed in considerable malalignment (at least 1 cm shortening, dislocation of at least a half of the breadth of the femoral shaft, angular deformity of more than 10 degrees) (p = 0.003) and in fractures that were subjected to manipulation (secondary reduction, change of treatment or traction weight) during the healing process (p = 0.007). Furthermore, all 7 patients who had infection requiring treatment at the tibial plateau extension had more pronounced tibial growth. No significant difference was found between tibial growth and the age of the child at the time of injury, the type of fracture, the location of fracture and the mode of treatment. The following factors were evaluated as being clinically relevant: primary, largely anatomic reduction, avoidance of secondary manipulation and prevention of infection at the tibial plateau extension.

Adolescent↗
PubMed1999

Virtual reality of the lower urinary tract in women.

Advances in computerized and imaging technology permit both students and doctors to depict the anatomy of the human pelvis more realistically than with previous methods. Further refinements outline fine pelvic structures, such as the nerve plexus, which may as a result be spared during major pelvic surgery, thus preserving the function of the bladder neck and urethra. Dynamic computerized tomography or magnetic resonance imaging, coupled with three-dimensional depiction of the lower urinary tract and its adjacent structures, enable visualization of the whole lower urinary tract and the pelvic floor musculature in both continent and incontinent women. In patients with a reconstructed lower urinary tract computer-assisted image processing shows the postoperatively altered topographical anatomy. This may be clinically useful for interpretation of unexpected findings with conventional imaging modalities, postoperative morbidity, and surgical planning of a lower abdominal reoperation. Examples of our own work regarding the innervation of female pelvic organs, dynamic depiction of the bladder and pelvic floor musculature during straining in normal and incontinent women, and the situation of female patients after undergoing an anterior pelvic exenteration with subsequent orthotopic neobladder procedure, are given. In addition, the data of these patients have been compiled for virtual reality endoscopy, which is useful for patient consent and for teaching residents, students and nurses.

Female↗
PubMed1998

[ACOnet (Austrian Academic Computer Network) as data carrier for teleradiologic consultations].

PURPOSE: To assess the feasibility of image transfer for teleradiologic consultations using the Austrian Academic Computer Network (ACOnet). The ACOnet corresponds between the main universities to a MAN (Metropolitan Area Network) with a transfer rate of 4 Mbps. Its use is free of charge for university institutions. MATERIALS AND METHODS: 1740 test image data sets and 620 image data sets for teleradiological consultations were exchanged without annotations between the Departments of Diagnostic Radiology of the universities of Innsbruck and Graz, using the ACOnet. RESULTS: Data transmission was reliable and fast with an average transfer capacity of 170.2 kBytes/s (94-341 kBytes/s). There were no major problems with image transfer during the test phase. CONCLUSION: Due to its high transfer capacity, the ACOnet is considered a reasonable alternative to the ISDN service.

Austria↗
PubMed1998

The Austrian Academic Computer Network and its usefulness for teleradiology.

To study the value of the Austrian Academic Computer Network (ACOnet) for teleradiology, 1740 test image data-sets and 620 image data-sets were exchanged between the departments of diagnostic radiology of the Universities of Innsbruck and Graz using the ACOnet service. Data transmission was reliable and fast with an average transfer capacity of 170 kByte/s (range 94-341). During the test phase, no major problems with image transfer occurred. Assuming that problems like security of patient data-sets, data compression and data verification can be solved, the ACOnet service would be a useful additional tool for telemedicine applications throughout Austria and eastern Europe.

Austria↗
PubMed1997

Virtual computed tomography gastroscopy: a new technique.

BACKGROUND AND STUDY AIMS: The aim of the present study was to establish a suitable method for virtual computed tomography (CT) gastroscopy. PATIENTS AND METHODS: Three-millimeter helical CT scans of a pig stomach were obtained after air insufflation and instillation of diluted diatrizoic acid (Gastrografin), and with double contrast. In addition, three patients with gastric tumors were studied after ingestion of an effervescent agent (Duplotrast, 6 g) and intravenous injection of hyoscine butylbromide (Buscopan, 1 ml). Virtual endoscopy images were computed on a Sun Sparc 20 workstation (128 megabytes of random access memory, four gigabytes of hard disk space), using dedicated software (Navigator, General Electric Medical System Company). The endoscopy sequences were compared with real endoscopic examinations and with anatomical specimens. RESULTS: In the cadaver studies, the best results were obtained with plain air insufflation, whereas virtual CT gastroscopy with diluted contrast and with double contrast showed artifacts simulating polyps, erosions, and flat ulcers. Patient studies showed good correlation with the fiberoptic endoscopy findings, although large amounts of retained gastric fluid substantially reduced the quality of the surface reconstruction. CONCLUSION: These preliminary results show that virtual CT gastroscopy is able to provide insights into the upper gastrointestinal tract similar to those of fiberoptic endoscopy. However, due to the limited spatial resolution of the CT protocol used, as well as inherent image artifacts associated with the Navigator program's reconstruction algorithm, the form of virtual CT gastroscopy studied was not capable of competing with the imaging quality provided by fiberoptic gastroscopy.

Animals↗
PubMed1997

[Open questions on the topic of teleradiology from the current viewpoint].

A review on the theoretical challenges and potential risks of teleradiology is given. Based on the authors two years clinical experience and the current literature unsolved problems are discussed, which are to a smaller extent the technical implementation but much more the still missing regulation of various concomitant circumstances.

Computer Security↗
PubMed1997

[Virtual CT colonoscopy. Examination technique, limitations and perspectives].

Virtual CT-colonoscopy is a post-processing method which allows for reconstruction of inner bowel surface structures from helical CT datasets. The reconstructed images simulate the views which are known from fiberoptic endoscopy. Since colorectal cancer is the second main cause of death in USA and Europe today and since recent screening recommendations are often ignored by the public, a non-invasive or minimal-invasive procedure for colonic evaluation would offer some benefits. Virtual CT-colonoscopy generally involves three essential steps: patient preparation with cleansing of the bowel and administration of an air enema, helical CT-examination by using appropriate scan parameters, and interactive 3D rendering of the volume data-set. Although recent studies have demonstrated that polypoid lesions of about 5 mm size are well detectable and although virtual colonoscopy offers many advantages over fiberoptic endoscopy, some technical and clinical limitations must still be noted. Thus, the current inability of virtual colonoscopy to provide texture and color leads to problems in identifying flat lesions; the presence of retained or adherent fecal matter may result to false positive diagnosis and collapsed segments of bowel may cause problems as they cannot subsequently be evaluated during image reconstruction. Virtual endoscopy is still in its infancy and further technical and clinical developments are necessary. Virtual CT-colonoscopy may then prove to be equal or superior to colonoscopy in sensitivity and specificity for polyp detection and be able to reduce the number of unnecessary colonoscopic procedures.

Colonoscopes↗
PubMed1996

[Establishment of an emergency CT service by means of teleradiology].

UNLABELLED: The teleradiological connection between the University Hospital in Innsbruck, Tyrol, and the Regional Hospital in Zwettl, Lower Austria, is presented as an example of a routine online connection of two helical CT systems. PURPOSE: To establish a practicable and cost-efficient emergency CT service in a remote hospital during night time and on weekends. MATERIAL AND METHODS: Online connection of a GE HiSpeed Advantage-Spiral-CT and a GE Prospeed-Spiral-CT via two Sun SPARC 10 work stations and ISDN. RESULTS: The transmission of 121 CT data sets from 116 patients revealed a sufficiently fast average transmission time of 15 (6-53) minutes and average transmission costs of DM 9.00 per examination. The system was technically reliable, cost-efficient and practicable in clinical routine application. CONCLUSIONS: Teleradiology enables remote hospitals to provide an emergency CT service even if there is no radiological specialist available outside office hours. Thus time-consuming and cost-intensive patient transfers and delay of therapy can be reduced.

Austria↗
PubMed1975

[The treatment of respiratory failure in severe chest injury (author's transl)].

The use of artificial ventilation versus conservative treatment in 101 patients with severe chest injuries is reconsidered, because major ventilation therapy carries a high incidence of complications. This technique within the past few years has increasingly been replaced by differentiated conservative respiratory treatment. On the basis of a retrospective study it is concluded that under special conditions even the unstable chest accompanied by respiratory insufficiency may be treated successfully by this technique.

Adolescent↗