Photon Counting Detector Polarization Stabilization
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Solution Overview
Problem
Existing X-ray imaging apparatuses using photon counting detectors face issues with polarization caused by both applied voltage and X-ray irradiation, leading to errors in energy measurement and degraded image quality.
Innovation Solution
An X-ray imaging apparatus that includes a control unit to check for unstable polarization in the photon counting detector, and if unstable, it ensures the subject is not in the X-ray irradiation field before irradiating the detector with X-rays to stabilize the polarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If X-ray irradiation is applied to stabilize polarization of the photon counting detector, then polarization stability is improved, but unnecessary exposure of the subject to X-rays occurs
Solution Approach 1:
The system performs preliminary X-ray irradiation to the detector before actual imaging to stabilize polarization, but only when the subject is confirmed to be absent from the irradiation field. This preliminary action prepares the detector in advance without exposing the subject to unnecessary radiation.
Solution Approach 2:
The photon counting detector serves itself by using X-ray irradiation to stabilize its own polarization state before imaging. The detector's polarization stability is self-corrected through controlled irradiation, eliminating the need for external intervention or complex stabilization mechanisms.
2Measurement precision
If X-ray irradiation is continuously applied to maintain stable polarization, then measurement precision is improved, but loss of time increases due to ineffective exposure
Solution Approach 1:
Instead of continuous irradiation, the system uses periodic or conditional irradiation only when polarization instability is detected and the subject is absent. This periodic approach maintains measurement precision while eliminating time waste from continuous ineffective exposure.
Solution Approach 2:
The control unit continuously monitors polarization stability and provides feedback to determine when X-ray irradiation is needed. This feedback mechanism ensures irradiation occurs only when necessary for stabilization, optimizing both measurement precision and time efficiency.
3Reliability
If polarization stabilization is performed before imaging, then reliability of energy measurement is improved, but productivity decreases due to additional preparation time
Solution Approach 1:
Polarization stabilization is performed as a preliminary action before imaging, but only when the subject is absent from the irradiation field. This allows the system to prepare the detector in advance without extending the actual imaging time, thus maintaining productivity while improving reliability.
Solution Approach 2:
The system dynamically adjusts the timing of polarization stabilization based on subject presence detection. When the subject is present, imaging proceeds immediately; when absent, stabilization is performed. This dynamic approach optimizes the balance between reliability and productivity.
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 approach effectively stabilizes the polarization of the photon counting detector and reduces ineffective exposure of the subject, thereby maintaining image quality and preventing errors in energy measurement.
Implementation Method 1
a photon counting detector that counts an X-ray photon for each energy bin
Implementation Method 2
an X-ray source that irradiates an X-ray
Data Source
AI summary
Provided is an X-ray imaging apparatus capable of stabilizing polarization of a photon counting detector and suppressing ineffective exposure of a subject.An X-ray imaging apparatus comprises an X-ray source that irradiates an X-ray, a photon counting detector that counts an X-ray photon for each energy bin, and an image generation unit that generates a medical image of a subject based on a detector output from the photon counting detector. The X-ray imaging apparatus further comprises a control unit that checks, in a case where polarization of the photon counting detector is not stable, the subject not being present in an X-ray irradiation field which is a range where the X-ray is irradiated from the X-ray source and then causes the X-ray source to irradiate the photon counting detector with the X-ray.