Photon Counting Radiation Detector Cooling Control
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Solution Overview
Problem
Radiation imaging apparatuses, such as CT scanners, face challenges in maintaining image quality due to temperature fluctuations caused by heat generation in radiation detectors, particularly when the incident dose changes suddenly, leading to delayed feedback control and image deterioration.
Innovation Solution
A radiation imaging apparatus equipped with a photon counting type radiation detector and a cooling unit that adjusts coolability based on the photon counting rate, ensuring constant operation temperatures by controlling the air volume of cooling fans in response to the photon counting rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If feedback control based on temperature measurement is used to equalize temperature distribution, then temperature uniformity is improved, but response time deteriorates when dose changes suddenly
Solution Approach 1:
The cooling unit performs preliminary cooling action based on the photon counting rate before temperature fluctuation actually occurs. By monitoring the photon counting rate which correlates with heat generation, the system proactively adjusts cooling power in advance, eliminating the time delay inherent in feedback control that waits for temperature measurement to detect changes.
Solution Approach 2:
The system replaces the mechanical temperature measurement and feedback control mechanism with a direct electronic control mechanism based on photon counting rate monitoring. This substitution allows for instantaneous response to changing radiation conditions without the thermal inertia and measurement delay associated with physical temperature sensors and feedback loops.
2Temperature
If cooling power is increased to maintain temperature stability, then temperature fluctuation is reduced, but energy consumption increases
Solution Approach 1:
The cooling power is made dynamic and variable based on the actual photon counting rate rather than operating at constant maximum power. The cooling unit adjusts its cooling capacity in real-time to match the heat generation level, providing just enough cooling to maintain temperature stability while consuming only the necessary energy, thereby optimizing the balance between temperature control and energy efficiency.
Solution Approach 2:
The system changes the cooling power parameter dynamically according to the photon counting rate. When the photon counting rate is low, cooling power is reduced; when the photon counting rate increases, cooling power is increased accordingly. This parameter adjustment strategy maintains effective temperature control while minimizing unnecessary energy consumption during low-dose periods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively maintains image quality by promptly adjusting cooling to match changing photon counting rates, reducing temperature fluctuations and preventing image deterioration even when the incident dose varies suddenly.
Implementation Method 1
controls a coolability of the radiation detector in response to the photon counting rate
Implementation Method 2
a detection element to convert radiation into an electrical signal
Implementation Method 3
The electronic circuit is operated by radiation entering the detection element and generates heat
Data Source
AI summary
The present invention provides a radiation imaging apparatus capable of maintaining the quality of an image obtained even when a dose incident on a radiation detector changes suddenly. The present invention is a radiation imaging apparatus including a radiation source, a radiation detector to detect radiation emitted from the radiation source, and a cooling unit to cool the radiation detector; and is characterized in that the radiation detector has a counting circuit to output a number of photons in radiation counted per unit time as a photon counting rate, and the cooling unit controls a coolability of the radiation detector in response to the photon counting rate.