Characterization and correction of temporal artifacts in CT.
Medical Physics
|May 12, 2017
Summary
Temporal delays in computed tomography (CT) detectors cause image artifacts. This study models these effects and develops a filter to compensate for artifacts, improving CT image quality.
Area of Science:
- Medical Imaging
- Physics
- Computer Science
Background:
- Computed tomography (CT) imaging is crucial for medical diagnosis.
- Image artifacts can degrade diagnostic accuracy.
- Temporal detector response is a known source of CT artifacts.
Purpose of the Study:
- To investigate image artifacts caused by delayed computed tomography (CT) detector responses.
- To develop a method for compensating these temporal artifacts.
- To understand the relationship between artifact severity, detector properties, and scanner speed.
Main Methods:
- A computer model of a third-generation CT scanner was created.
- Simulations were performed using various phantoms and detector time constants.
- A theoretical framework was developed to analyze temporal artifacts.
Main Results:
- Image artifacts were observed and quantified across different simulation parameters.
- Artifact severity was found to correlate with the detector's time constant and scanner's angular speed.
- A filter function capable of compensating for temporal artifacts was derived.
Conclusions:
- Temporal detector response significantly impacts CT image quality.
- The developed filter effectively compensates for these artifacts.
- Understanding these parameters is key to mitigating CT image artifacts.
Keywords:
Ancillary equipmentCharge transferComputed radiographyComputed tomographyImage reconstructionImage scannersImage sensorsMedical image artifactsMedical imagingModulation transfer functionsNon-ionizing radiation equipment and techniquesPhotonsScintillation detectorsbiomedical equipmentcomputed tomography (CT)computerised tomographydigital simulationimage scannersimage sensorsphantomstemporal artifacttemporal correction filterMore Related Videos
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