SYSTEMS AND METHODS FOR PROVIDING INFORMATION CONCERNING CHROMOPHORES IN PHYSIOLOGICAL MEDIA

摘要

The present invention generally relates to systems and methods for providing information about chromophores in physiological media. More particularly, th e invention relates to non-invasive systems and methods for determining absolu te values of oxygenated and/or deoxygenated hemoglobins and their ratios in a physiological medium. The system generally includes a portable probe having a source module (122) for irradiating into the medium electromagnetic radiatio n, a detector module (124) detecting radiation from a target area in the medium , and a processing module (140) determining the absolute values of the chromophore concentrations and the ratios thereof based on input and output parameters of the source and detector modules. In one aspect, the invention provides a solution for unknown parameters of the chromophores in a medium using a novel processing algorithm. In another aspect, the invention concern s a portable unit for performing the requisite measurements, which unit includ es a movable member having one or more radiation sources and one or more radiation detectors, and an actuator designed to cause the member to move along predetermined curvilinear paths. Properties of the chromophores are measured for individual voxels defined along each motion path, and/or cross- voxels defined at the intersection of voxels along different motion paths. These measured values are then used in a preferred embodiment to generate tw o- or three-dimensional images of the distribution of chromophores or their properties. In other aspects, the invention includes various patterns for th e optimal distribution of sources and detectors for the optical probe, and sel f- calibrating operation of the probe substantially in real-time.