Abstract: A grooved gel arrangement comprises a base portion having grooves extending in a longitudinal direction thereof, a gel disposed on the grooved portion and filling in the grooves, and a top portion disposed on top of the base portion, with the gel sandwiched therebetween. When protein is applied to the gel and is subjected to an electrophoretic procedure, diffusion of the protein is substantially eliminated.

Abstract: A digital dental system and method for real time display of a patient's dental image to detect changes with respect to at least one previous dental image of the patient. The system comprises an imaging unit for obtaining a real time dental image from the patient, a converter for converting the real time dental image to digital form, an input device for inputting further digital signals corresponding to at least one previous dental image of the patient, a processor for processing the digital signals and the further digital signals to develop corresponding display signals and further display signals, and a display unit and at least one further display unit for simultaneously and in real time displaying the dental image and the at least one previous dental image, respectively, of the patient. A preferred embodiment of the invention involves whole picture processing of the present and previous dental images to determine changes or differences therebetween.

Abstract: The non-linear conductance and capacitance characteristics of electrically non-homogenous materials over a given frequency range are used to identify and analyze such materials.

Abstract: A computerized electro-oculographic (CEOG) system comprises an integrated system for automated administration of electro-oculographic tests and visual evoked response tests to a patient, and automated processing of the results derived from such tests. The CEOG system is responsive to operator selection of desired stimuli to be administered, as well as to operator specification of various test stimuli characteristics, for automatically administering to the patient the test stimuli having the desired characteristics. Electrode test data derived therefrom are immediately recorded on-line, and are immediately and automatically analyzed to provide critical information for immediate display in acceptable format and in a very short period of time. The integrated CEOG system compensates for the "offset voltage" phenomenon typically encountered with respect to electrode test data by provision of both manual and automated compensating capabilities.

Abstract: An ultrasonic pulse is directed into a body and electrical representations of pulse reflections from body interfaces along its path are generated. The ultrasonic signal path is scanned through a volume of the body and position signals indicative of the instantaneous path disposition are generated. The reflection signals are selectively gated in accordance with a predetermined function of the path disposition to provide a display selectively representing desired interfaces situated within a selected contoured portion of the volume. By varying the predetermined function, a specific desired interface surface may be displayed. Provisions for developing a three dimensional display of the selected surface are described.

Abstract: The type of conductor, its property, and if a metal, its type and cross-sectional area can be obtained from measurements made at different frequencies for the amount of unbalance created in a previously balanced stable coil detection system. The true resistive component is accurately measured and thus reflects only the voltage loss attributable to eddy currents caused by introduction of the test sample to the coil system. This voltage divided by corresponding applied frequency gives a curve which peaks at a frequency dependent upon type of conductor. For a metal this peak frequency is proportional to the samples resistivity divided by its cross-sectional area.

Abstract: The definition of a tomographic readout image is highly sharpened and improved by minimizing or eliminating the effects of persisting images in the electronic scintillating circuit resulting from phosphorescent afterglow, by utilizing a special filter network in the detecting circuit.

Abstract: A shutter arrangement and activator device for a diagnostic X-ray machine of the type which rotates about the patient while scanning with thin beams for analysis by computers for storing and reconstructing the results in tangible form. The shutter mechanism is positioned between the X-ray source and a detector unit and includes a movable apertured shutter plate disposed between a pair of slotted plates. The shutter plate is automatically moved into and out of the X-ray path by means of a patient detector system. A belt or band, which permits the passage of X-rays but not light, is disposed on the patient and triggers the detector system.