Abstract: A method for tomographic imaging a dielectric object includes irradiating an object with electromagnetic radiation during a first time interval, receiving electromagnetic radiation passed through dielectric object to generate a first dataset at a plurality of spatial locations, irradiating the object with electromagnetic radiation during a second time interval, receiving electromagnetic radiation passed through dielectric object to generate a second dataset at a plurality of spatial locations, generating a third dataset, wherein the third dataset is determined as a function of the first dataset, the second dataset, and a normalized difference between the first dataset and the second dataset, and reconstructing a dielectric image of the object based on the third dataset.

Abstract: A system includes at least one physiological sensor, at least one radiation source, at least one radiation detector, and a digital processor. The physiological sensor is configured to monitor a circulatory physiological parameter of a subject and to generate at least one physiological signal indicative of the monitored physiological parameter. The at least one radiation source is configured to irradiate a tissue portion with electromagnetic radiation. The at least one radiation detector is configured to detect at least a portion of the irradiating radiation transmitted through or reflected by the tissue portion and to generate at least one detected radiation signal. The digital processor is configured to receive the physiological and detected radiation signals and process the signals to derive information regarding the at least one physiological condition within the target tissue.

Abstract: A tomography apparatus for producing image data representative of a dielectric and/or conductivity property distribution within an object using electromagnetic radiation having a frequency in the range 0.05 GHz to 10 GHz, the apparatus having: a processing means for producing image data representative of a dielectric and/or conductivity property distribution within an object located in the imaging domain based on measurement data from the measuring means, wherein the tomography apparatus is configured so that electromagnetic radiation incident on the receivers during a second time period t2 is disregarded for the production of said image data when the apparatus is in use, the second time period t2 being subsequent to a first time period t1 during which electromagnetic radiation is emitted by a selected one of the emitters. The tomography apparatus may include waveguide antennae, the real component ?r? of the complex relative permeability ?r of each waveguide antenna being substantially more than 1.