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METHOD AND SYSTEM FOR EFFECTIVE TEMPERATURE CONTROL IN A CT DETECTOR

IP.com Disclosure Number: IPCOM000183909D
Publication Date: 2009-Jun-05
Document File: 4 page(s) / 55K

Publishing Venue

The IP.com Prior Art Database

Abstract

[0010] A method and system for a controlling temperature in a CT detector is disclosed herein. The heat is transferred from the heat source to the high thermal conductivity substrate, which is mounted to a thermally conductive metallic rail. Thermoelectric module is mounted between the metallic rails and heat rejecting heat sink that is air cooled. Thermal sensor is located on the metallic rail in close proximity of the thermoelectric module to control the voltage to the thermoelectric module using pulse width modulation and Proportional, Proportional Integral or Proportional Integral and Derivative control to smoothly change the voltage to the thermoelectric modules.

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METHOD AND SYSTEM FOR EFFECTIVE TEMPERATURE CONTROL IN A CT DETECTOR 

FIELD OF INVENTION

[0001]               The invention generally relates to computed tomography detectors and more specifically to a method and system for controlling temperature in a CT detector.   

BACKGROUND OF INVENTION

[0002]               In CT detectors, the electronics is sensitive to temperature variation and it needs to be controlled to a constant value between calibration and patient scanning. Controlling the detector electronics temperature to a constant value is essential for getting artifact free images in a CT scanner.

[0003]               Many of the existing solution offer air cooling or liquid cooling technique to minimize the temperature. Some of the current air cooled systems use a fan plenum and heaters on the metallic rail. In the current systems the heat generating electronics is few inches away from the temperature sensitive photodiode. Alternately a liquid cooled cold plate is planned for similar type of application by controlling the liquid temperature into the cold plate.

[0004]               However, some detector modules have heat generating component in very close proximity of temperature sensitive photodiode. The existing solutions do not suggest an effective temperate control method for detectors where the heat generating component is very close to the temperate sensitive photo diode.

[0005]               Thus it will be beneficial to have a system and method to provide effective temperature control in CT detectors.

SUMMARY OF INVENTION

[0006]               An embodiment of the invention provides a method and system for controlling detector electronics temperature to a constant value. In an exemplary embodiment, the detector has the heat generating component very close to the temperature sensitive photo diode.

[0007]               Effective temperature control requires cooling and temperature control of the electronics in order to achieve constant temperature on the photodiode. In an embodiment, the heat is transferred from the heat source to the high thermal conductivity substrate. The substrate includes metallic or ceramic substrates. The substrate is mounted to metallic rail, which is thermally conductive for example, Aluminum Alloy.   Thermoelectric module is mounted between the metallic rails and heat rejecting heat sink that is air cooled.  Thermal sensor is located on the metallic rail in close proximity of the thermoelectric module to control the voltage to the thermoelectric module using pulse width modulation and Proportional, Proportional Integral or Proportional Integr...