Thermoelectric controlled x-ray detector array

Abstract

Disclosed is an X-ray detector assembly for use in a computed tomography system. The X-ray detector assembly comprises an array of detector cells coupled between two rails. A thermoelectric cooler is coupled to an end of each of the rails, and is controlled to alternatively heat or cool the detector array to maintain the array in a substantially isothermal and thermally stable condition. The detector assembly preferably includes both passive and active cooling devices and insulation materials for controlling the temperature of the detector assembly. An electrical heater coupled at the center of the detector array can be used in conjunction with the TEC's to control the temperature profile of the detector array, and to minimize changes in the temperature gradients.

Description

technical field [0001] The present invention generally relates to an array of X-ray detectors for use in a computed tomography system. In particular, the invention relates to a method and apparatus for maintaining an X-ray array under substantially isothermal and thermally stable conditions. Background technique [0002] Computed tomography (CT) imaging systems typically include an x-ray source and an array of x-ray detectors mounted on opposite sides of a gantry with an imaging region interposed therebetween. The detector array typically includes a plurality of detector elements arranged in rows and columns. The detector array or module includes detection elements and associated electrical components to convert the x-ray signals into measurable analog or quantifiable digital signals. In many configurations, the array is mounted on axially separated rails of the gantry. [0003] In operation, an x-ray source generates x-rays directed at the array. When an object (such as...

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Problems solved by technology

Under these conditions, the heating controller cannot maintain the detector array within an acceptable operating temperature

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