Abstract: Methods and devices for phase shifting an RF signal for a base station antenna are provided. The device includes a transmission line that has a stationary ground plane coupled to the top of a substrate and a signal line on the bottom of the substrate. The signal line has an input port and an output port. The input port receives the RF signal with a certain phase and travels across the bottom of the substrate to the output port. The RF signal has a different phase at the output port because defected ground structures etched on the stationary ground plane shift the phase of the RF signal. In addition, the device includes a movable ground plane that may cover a portion of the defected ground structures, the substrate, and the stationary ground plane such that the moveable ground plane further adjusts the phase of the RF signal.

Abstract: A system and method for detecting a cyst from a dental radiographic image is provided. The system and method comprises comparing the radiographic image to a plurality of template images, calculating a cross correlation coefficient between a plurality of regions in the radiographic image and a corresponding plurality of regions in the template image, determining a cyst region in the radiographic image based on a value of the cross correlation coefficient and computing a severity level of the cyst.

Abstract: Briefly, in accordance with one aspect, a method for detecting caries on a tooth is provided. The method includes clustering image pixels of an edge-enhanced image of the tooth to identify enamel, dentine, pulp and caries layers of the tooth and determining a plurality of texture parameters for each of the identified enamel, dentine, pulp and caries layers. The method also includes comparing the plurality of texture parameters with reference parameters to detect caries on the tooth.