[Digital substance-qualitative x-ray imaging in the low-energy molybdenum spectrum].
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Arthrography↗
Biomedical subjects
J Mockenhaupt
Publications and source records attributed to J Mockenhaupt.
[Absorption properties of supporting tissues in low-energy molybdenum spectrum as basis for a material-qualitative roentgen image in mixed color coding].
The absorption properties of bone and cartilage tissue in the molybdenum spectrum are studied firstly according to Bragg and secondly by means of radiographs taken with different sections of the spectrum, revealing differences substance-specifically dependent on the radiation frequency. These differences can be utilised for imaging by means of substance-specific color-coded radiography.
Absorptiometry, Photon↗
Simplified nerve cell counting in the rat brainstem with the physical disector using a drawing-microscope.
A simple modification of the physical disector is presented which is used to count the number of neurons in the hypoglossal nucleus of the rat in a series of paraffin sections. One disector consists of two adjacent sections (6 microm thick) that have been Nissl-stained with cresyl fast violet. In the first step of the procedure each of the two sections in investigated separately with a drawing-microscope. The boundary of the hypoglossal nucleus and the position of neurons devoid of, or containing a part of, the cell nucleus in the plane of the section are marked on transparent paper. In the second step, these two drawings are placed one upon another, aligned and the number of cell profiles that show a cell nucleus in one but not in both drawings counted. This modification of the disector method for cell counting needs no specialized equipment, simply a light microscope with drawing apparatus, and can be combined with histochemical studies of other sections from the same tissue block.
Animals↗
[The temporal bone].
Imaging of the temporal bone by high resolution CT scan has become more and more accurate in recent years. Coronal slices are particularly important. We present the anatomy of four temporal bones embedded in plastic material. Coronal sections with a thickness of 2 mm were taken, radiographed and their density measured. Particular interest was given to the three-dimensional relations as well as to the density of bone of important morphological structures such as the labyrinth, middle ear, facial canal, sigmoid sinus, carotid canal and the mastoid. A low density of bone corresponds to the colour blue, a high density to black. Because of the high resolution of the method it was possible to image small and fine structures such as the auditory ossicles, and the perilymphatic and endolymphatic ducts. A three-dimensional reconstruction may well be possible in the future, and the possibilities of this method are discussed.
Carotid Artery, Internal↗
[Theoretical and experimental analysis of the significance of the intact and damaged meniscus for static stress on the knee joint].
With the aid of theoretical analysis and load-bearing experiments the behavior of the menisci of the knee joint on static terms is investigated. According to the theoretically postulated energy-absorbing function of the meniscus there is shown a decrease of pressures acting on the meniscotibial joint from the inner to the outer parts. The invariable position of the meniscus, which had been seen on static strain, and the slight gaping of incomplete incisions of radial orientation are explained with the histomorphology of the meniscal system. The behavior of a bucket-handle incision is interpreted by the special stress distribution.
Aged↗
[Experimental studies of forces on the radiocarpal joint in minus deviation of the ulna].
The length of the radius was experimentally altered with respect to the distal end of the ulna. Pressure levels at several points in the wrist were measured simultaneously. Lengthening of the radius leads to an increased pressure between the distal radius and scaphoid and between the distal radius and lunate.
Aged↗
[The density of cortical bone of the distal radius].
The rigid fixation of distal radius fractures by T plates needs a bone substance of sufficient strength to insert screws. In case of advanced osteoporosis only the cortical cone will provide a secure fixation. In this investigation the results of measurement concerning the thickness of palmar and dorsal cortical bone of the distal radius are reported relating to age and sex.
Adult↗
Pressure distribution in partly contacting joints--a computerized simulation model.
The influence of the geometrical shape and of the material properties on articular surfaces in partly contacting joints have been studied with a computerized simulation model. The size of articular surface, maximal pressure in the joint cleft and the flattening of the joint bodies during articulation above all will depend on transmitted force, geometrical shape and on the material properties of the cartilage.
Biomechanical Phenomena↗
[Stress on the normal and pathologic wrist joint].
The wrist joint is generally stressed by external forces. The resultant of these external forces produces the pressure in the joint which evokes pressure stresses within the supporting tissues of the joint. As was shown by Pauwels (1973) the density of the subchondral bone is adapted to articular stress distribution. The zone of subchondral bone can be seen as the morphological equivalent of the specific joint stress. This paper shows by means of density analyses and pressure measurements that in contrast to earlier opinions joint pressure is transmitted both by the lunate and the scaphoid bones. It seems that the physiological stress is even higher in the scaphoid than in the lunate bone. The force transmission between the lunate and the ulnar disc is less pronounced. The analysis of the lunatal trabecular architecture leads to the suggestion that the lunate is stressed differentially in the radio-ulnar plane. In pathological conditions of the wrist joint (perforation of the disc, ulnar shift, Kienböck's disease, ulna minus variant) the pressure and the density distribution are adapted to the pathomorphology in each case.
Aged↗
[Radiologic determination of the length of the distal end of the radius and ulna].
The influence of inaccurate positioning of the hand and forearm upon the relative lengths of the ulna and radius is investigated systematically in anatomical specimens and living persons. Increased or decreased ulnar lengths could be produced by moving up and down, by tilting or by pronation of the forearm. Extension of the elbow also influences the ulnar variance measurement.
Biomechanical Phenomena↗
[An obscure "tumor" in the phrenicocostal sinus].
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Adult↗
In-house laboratory testing.
By adding ancillary services such as in-house laboratory testing, the St. Cloud Medical Group has taken a step towards meeting the challenge of today's rising costs and increased competition. The purchase of a discrete clinical analyzer has improved patient service in many ways, and has also increased clinic efficiency and profitability.
Diagnostic Services↗