PET-CT Respiratory Phase Synchronization for Attenuation Correction
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Solution Overview
Problem
Conventional PET-CT apparatuses do not adequately synchronize respiratory phases during attenuation correction, leading to image artifacts due to respiratory movement, which degrades the quality of PET images.
Innovation Solution
The PET-CT apparatus includes processing circuitry that acquires and synchronizes CT and PET scan data by identifying the respiratory phase during CT imaging, generating gate data to align PET data with the CT respiratory phase, and reconstructing PET images using an attenuation-correcting CT image and gate data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If attenuation correction is performed using a CT image without respiratory phase synchronization, then the processing is simple and fast, but image artifacts occur due to respiratory movement
Solution Approach 1:
The system performs preliminary respiratory phase identification during the CT scanning process. By identifying the respiratory phase at the time of CT image acquisition in advance, the system prepares the necessary synchronization information before PET image reconstruction, thereby eliminating respiratory movement artifacts without adding complex real-time processing during reconstruction.
Solution Approach 2:
The system implements a feedback mechanism where the identified respiratory phase information from the CT scan is used to guide the PET image reconstruction process. The processing circuitry uses this feedback to selectively apply attenuation correction based on matching respiratory phases, ensuring that only appropriately synchronized data is used for reconstruction.
2Measurement precision
If respiratory phase synchronization is implemented, then image quality improves, but processing time and complexity increase
Solution Approach 1:
The system performs respiratory phase identification during the CT scanning process itself, rather than requiring separate monitoring during PET acquisition. This preliminary action captures the respiratory phase information when the subject is already in the scanner, eliminating the need for additional monitoring equipment or extended processing time.
Solution Approach 2:
The system merges the respiratory phase identification function with the existing CT scanning process. By combining these functions, the system achieves precise respiratory phase synchronization without adding separate monitoring hardware or extending the total scanning time, as the CT scan serves dual purposes.
3Productivity
If CT image is used for attenuation correction without respiratory consideration, then the workflow is efficient, but artifacts are generated
Solution Approach 1:
The system performs preliminary respiratory phase identification during the CT scanning process. By identifying the respiratory phase at the time of CT image acquisition in advance, the system prepares the necessary synchronization information before PET image reconstruction, thereby eliminating respiratory movement artifacts without adding complex real-time processing during reconstruction.
Solution Approach 2:
The system implements a feedback mechanism where the identified respiratory phase information from the CT scan is used to guide the PET image reconstruction process. The processing circuitry uses this feedback to selectively apply attenuation correction based on matching respiratory phases, ensuring that only appropriately synchronized data is used for reconstruction.
Data Source
AI summary
A PET-CT apparatus according to the embodiment includes processing circuitry. The processing circuitry scans a subject to acquire an attenuation-correcting CT image, identifies a respiratory phase of the subject when the CT image is scanned, acquires PET scan data that is based on a gamma ray emitted from the subject, generates gate data by gating the PET scan data based on the respiratory phase, and reconstructs a PET image based on the CT image and the gate data.