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Biomedical subjects

J Lotz

Publications and source records attributed to J Lotz.

59 records · Page 4Linked to original sources
PubMed1979

Computed tomography of infratentorial masses in children.

Seventeen cases of infratentorial mass lesions (excluding abscesses) in children are reviewed. The findings after computed axial tomography (CAT) are described, as well as the changes that were revealed by plain radiographs of the skull. Ancillary investigations were performed in 11 cases, and their usefulness is assessed. The possibility of making a provisional diagnosis of the nature of the lesion based on CAT findings is discussed.

Astrocytoma↗
PubMedDate not supplied

Universal interface for exchange of medical images via magneto-optical discs.

Digital images are the ever-growing basis of modern medical imaging and treatment. Despite the advent of the DICOM 3.0 standard for medical image communication it still requires cumbersome efforts to export images from imaging modalities to other computer systems. This is true especially for smaller institutions, which often have limited resources for standardized image transfer. To gain access even to these data we developed an exchange interface on the basis of magneto-optical discs (MO-discs), as they are usually available in most of the imaging modalities in use today. Unfortunately images on MO-discs are usually stored in formats specific for each manufacturer. Therefore special routines to access the data on MO-discs had to be developed for each company or even each scanner. Over 10,000 CT and MRI images including their header information from different General Electric and Siemens scanners were extracted successfully from MO-discs. The interface proved to be reliable and easy to handle by technicians. Support of additional manufacturers and of the DICOM 3.0 standard are work in progress.

Computer Communication Networks↗
PubMedDate not supplied

[Magnetic resonance tomography in therapy follow-up after repositioning treatment of congenital hip dislocation].

INTRODUCTION: After treatment of infantile hip dislocation in terms of reduction and retention in plaster casts or splints a problem of therapy controlling exists. To assess if the femoral head is in correct position centered in the socket ultrasound is not possible, because one cannot achieve the necessary standard position. Computertomograms are associated with a hereditary taint of radiation and plain roentgenograms lack of presentation of the important cartilaginous structures. METHOD: To control infantile hips after open or closed reduction from 1990 until 1996, 43 examinations by MR imaging were performed in 34 children. RESULTS: In our series MRI was able to provide exact information about the position of the femoral head independently of its state of ossification. Also, a clearly visualisation of the different structures of the acetabular fossa, particular acetabulum, pulvinar, bony and cartilaginous acetabular rim and limbus was possible. Furthermore the MR images showed interpositioned soft tissue, intraarticular effusion and displayed cartilaginous parts of the acetabular rim. CONCLUSIONS: MRI is an exact method to assess the anatomical and pathological conditions of the childlike hip joint. Because of the disadvantages of CT and X-ray, MRI is superior in terms of controlling the results after treatment of infantile hip dislocation.

Acetabulum↗
PubMedDate not supplied

[Follow-up of collagen and bone metabolism in patients with cement-free total hip endoprosthesis].

INTRODUCTION: This study investigated the influence of concentration and activity of several markers of the collagen and bone metabolism and their impact on ingrowth of non-cemented total hip arthroplasty. METHODS: 40 patients underwent an implantation of a ABG-prosthesis. Before surgery and 1, 2, 12 and 24 weeks after it serum concentrations of PICP, ICTP, IGF-1, ON, b-AP, Calcium, Phosphate, GPT and Creatinin were measured and a collagen ratio (CQ) was calculated. RESULTS: PICP decreased until 1st week, increased at 2nd week and decreased again after that time. ICTP increased significantly in 1st week, reached a maximum in 2nd week and decreased after that. b-AP decreased in 1st week but increased after that time. IGF-1 and ON decreased significantly after surgery but increased later. Calcium and Phosphate always showed normal values. CQ decreased in 1st week in males (45%) and females (60%), but increased later on. CONCLUSION: These markers investigated made it possible to estimate the osteointegration of non-cemented total hip arthroplasty and confirm radiologic and histomorphometric results of the literature.

Adult↗