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Biomedical subjects

J E Bateman

Publications and source records attributed to J E Bateman.

33 records · Page 2Linked to original sources
PubMed1983

Neurologic painful conditions affecting the shoulder.

Radiating pain accompanied by motor or sensory change, particularly below the elbow, strongly suggests a neurologic etiology of shoulder pain. The patient's description of the pain often is misleading because the shoulder joint has a movable fulcrum, which may be the site of a secondary irritant rather than a primary site. The pain may originate medially in the spinal cord or as far distal as the axillary border of the scapula. Precise identification usually requires myelography or discography in addition to a routine careful investigation. Included in this group are spinal cord tumors, extruded intervertebral discs, foraminal root compression syndromes, scalene and cervical rib syndromes, and various clavipectoral compression syndromes. The most confusing clinical picture results from nerve and vascular involvement, such as with cervical ribs, first rib abnormalities, or scalene muscle disturbances. Identification of specific characteristics of neural and vascular pain may help in the differential diagnosis of these lesions. Persistent neurologic deficit usually requires surgical treatment. Traumatic lesions of the plexus and individual nerves represent obvious causes and also may require surgical measures.

Chronic Disease↗
PubMed1982

Radionuclide ventriculography: evaluation of automated and visual methods for regional wall motion analysis.

Regional wall motion (RWM) abnormalities are sensitive indicators of left ventricular (LV) dysfunction, but quantitation of RWM with gated radionuclide ventriculography (RVG) has been limited, particularly in the left anterior oblique (LAO) projection. Regional LV performance was studied in 18 patients undergoing LAO RVG immediately prior to contrast ventriculography (CVG). Wall motion was analyzed by semiautomated and visual methods using several coordinate systems. For semiautomated methods, RVG and CVG wall motion were closely related in the two 90 degrees polar sectors at the apex and posterior wall (r = .85) and in the five 45 degrees polar sectors from midseptum through posterior wall (r = .82). The basal sectors on RVG had weak relationship to CVG, due to adjacent vascular structures. Semiautomated and visual grades for polar sectors on both CVG and RVG were closely related (r = .88- .94). Measured regional wall motion on LAO RVG compared favorably with near-simultaneous CVG in nonoverlapping portions of the LV and allowed objective quantitation of regional LV performance.

Adult↗
PubMed1978

A multiwire proportional gamma camera for imaging 99Tcm radionuclide distributions.

A gamma camera made of multiple multiwire proportional chambers with thin converter foils has been evaluated for clinical application. Results are presented from a small prototype (10 cm x 10 cm)showing good imaging of 99Tcm radionuclide distributions and comfirming the predictions of the theory regarding quantum efficiency and spatial resolution. The technique is especially aimed at creating a gamma camera with an active area greater than or approximately equal to 1 m2, a quantum efficiency of 15% and a spatial resolution approximately 3 mm, to be applied in whole body scanning and tomographic applications. The results generated by the current prototype indicate that the above requirements can be met using relatively cheap mass production techniques from the electronic industry. This apparatus is covered by patent applcation number 26595/77.

Gamma Rays↗
PubMedDate not supplied

The development of high-efficiency cathode converters for a multiwire proportional chamber positron camera.

A high-efficiency cathode converter for 511-keV photons has been developed for incorporation into a multiwire proportional chamber (MWPC) positron camera. The converter consists of a honeycomb pattern produced in a 1-mm-thick lead sheet to leave lead walls with a thickness of approximately 60 micron. The converter also serves as the cathode of an MWPC, the gap between the converter and the anode wire plane being 2.5 mm. This small gap results in a high secondary electron extraction efficiency without the need for additional drift voltages. Measurements of the efficiencies of a plane converter and of two types of structured converters in a single section MWPC are described and the efficiency is found to increase in proportion to the converter surface area. This result justifies the use of a simple theoretical model whereby an extrapolation to the efficiency of a detector consisting of a stack of 20 MWPC sections, each section having two converters, is made. The efficiency of this proposed system is calculated to be 17% for 511-keV photons.

Beta Particles↗