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TECHNIQUE FOR THERMAL MODULATION OF APPLICTION SPECIFIC INTEGRATED CIRCUIT POWER FOR CLOSED LOOP COMPUTED TOMOGRAPHY DETECTOR

IP.com Disclosure Number: IPCOM000250135D
Publication Date: 2017-Jun-05
Document File: 4 page(s) / 234K

Publishing Venue

The IP.com Prior Art Database

Abstract

A technique for thermal modulation of application specific integrated circuit (ASIC) power for closed loop computed tomography (CT) detector module is disclosed. The technique modulates the inherent power and heat generated by CT detector ASIC electronics and provides thermal regulation to photodiode and scintillator. Hence, power to ASIC is modulated according to the thermistor feedback located on the CT detector module.

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TECHNIQUE FOR THERMAL MODULATION OF APPLICTION SPECIFIC INTEGRATED CIRCUIT POWER FOR CLOSED LOOP COMPUTED TOMOGRAPHY DETECTOR

BACKGROUND

 

The present disclosure relates generally to computed tomography (CT) detector module and more particularly to thermal management of application specific integrated circuit (ASIC) power for closed loop CT detector module.

A CT detector module comprises scintillator, photodiode, integrating substrate, ASIC electronics and digital acquisition board. Figure 1 depicts one of various configurations possible with CT detector module elements. Recently available CT detector module configurations have ASIC device in close physical proximity to photodiode and scintillator. Therefore, the heat dissipated from ASIC is transferred effectively to photodiode and scintillator.

Figure 1

However, maintenance of precise temperature range is necessary for consistent image quality across the CT detector. The major shortcoming of the current CT detector is slow warm-time of detector elements during power-on and resets of detector due to liquid cooled thermal system. The challenge to maintain thermal control remains as elements of CT detector get larger, denser and consumes more power.

It would be desirable to have an improved technique for thermal modulation of ASIC power for closed loop CT detector module.

BRIEF DESCRIPTION OF DRAWINGS

Figure 1 depicts a block diagram of detector module with application specific integrated circuit (ASIC) and digital interface board.

Figure 2 depicts a simplified block diagram showing control of ASIC power.

Figure 3 depicts a detailed block diagram of control scheme.

DETAILED DESCRIPTION

A technique for thermal modulation of application specific integrated circuit (ASIC) power for closed loop computed tomography (CT) detector module is disclosed.  The technique modulates the inherent power and heat generated by CT detector ASIC electronics and provides thermal regulation to photodiode and scintillator. Hence, power to ASIC is modulated according to the thermistor feedback located on the CT detector module.

As depicted in Figure 2, the thermistor temperature is fed back to digital device and depending on the selected control scheme, digital device enables ASIC to dissipate certain power level. The digital device can physically modulate the power of ASIC by either of two methods. According to the first method, digital device directly changes the voltage or current of the device. According to the second method, digital device sets the state of ASIC and hence...