Radiation Imaging Apparatus Clock Phase Adjustment
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Solution Overview
Problem
Radiation image detectors experience noise due to high-frequency radiant noise from switching power supplies, leading to variations in charge accumulation periods and inconsistent pixel values across images, especially when synchronizing with external imaging synchronization signals.
Innovation Solution
A radiation imaging apparatus with a sensor, switching power supply, and readout unit that synchronizes signal readout with an imaging synchronization signal and adjusts the phase of the control clock to match the imaging synchronization signal's cycle, ensuring consistent timing and reduced noise influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the radiation image detector synchronizes with an external imaging synchronization signal, then the imaging operation can be coordinated with external equipment, but the charge accumulation period varies by up to one switching cycle, causing luminance differences between images
Solution Approach 1:
The patent makes the control clock dynamic by adjusting its phase in each cycle of the imaging synchronization signal. The phase adjustment unit dynamically modifies the control clock's phase based on the detected timing difference between the imaging synchronization signal and the switching operation, ensuring that the charge accumulation period remains consistent even when synchronized with external equipment.
Solution Approach 2:
The patent implements a feedback mechanism where the phase adjustment unit detects the timing difference between the imaging synchronization signal and the switching operation, then uses this feedback information to adjust the control clock's phase in subsequent cycles. This closed-loop feedback ensures that the charge accumulation period maintains consistency while preserving synchronization with external equipment.
2Productivity
If the switching power supply operates at high frequency, then power supply efficiency is improved, but high-frequency radiant noise and propagation noise are generated, causing noise in radiation images
Solution Approach 1:
The patent applies periodic action by selecting a switching frequency that is an integer multiple of the imaging synchronization signal frequency. This periodic alignment ensures that the switching noise occurs at regular intervals that do not interfere with the charge accumulation period, allowing high-frequency switching operation while minimizing noise impact on radiation images.
Solution Approach 2:
The patent converts the harmful high-frequency switching noise into a beneficial situation by synchronizing the switching frequency with the imaging synchronization signal. The noise, instead of causing random interference, becomes a periodic disturbance that can be predicted and avoided during charge accumulation, effectively transforming a harmful factor into a controllable parameter.
3Reliability
If the readout operation is performed in synchronism with both the imaging synchronization signal and the control clock, then timing coordination is achieved, but the phase misalignment causes accumulation period variation
Solution Approach 1:
The patent makes the control clock dynamic by adjusting its phase in each cycle of the imaging synchronization signal. The phase adjustment unit dynamically modifies the control clock's phase based on the detected timing difference, ensuring that the readout operation maintains both synchronization with external equipment and consistent charge accumulation period.
Solution Approach 2:
The patent changes the phase parameter of the control clock dynamically to resolve the contradiction. By adjusting the phase of the control clock in each cycle based on detected timing differences, the system maintains reliable timing coordination while ensuring consistent charge accumulation period, effectively using parameter modification to resolve the conflict between the two requirements.
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 reduces noise interference and maintains consistent charge accumulation periods across frames, resulting in uniform pixel values and improved image quality by synchronizing the switching power supply's operation with the imaging synchronization signal.
Implementation Method 1
a sensor configured to convert irradiated radiation into a charge in accordance with a radiation dose
Data Source
AI summary
A radiation imaging apparatus has a sensor that converts irradiated radiation into a charge in accordance with a radiation dose, a switching power supply for supplying power to at least the sensor, and a readout unit that reads out a signal corresponding to the charge from the sensor. The radiation imaging apparatus synchronizes the imaging synchronization signal and a control clock for a switching operation of the switching power supply, causes a readout of signal from the sensor by the readout unit to be executed, and adjusts the phase of the control clock in each cycle of the imaging synchronization signal so that a timing of the imaging synchronization signal that occurs cyclically is at the same phase of the control clock.