LSO Background Attenuation Maps for CT-Free PET Correction
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Solution Overview
Problem
Current nuclear imaging techniques, such as PET-CT and PET-MR, rely on additional CT scans for attenuation correction, increasing radiation dose to patients and using inaccurate Dixon-derived maps, while PET-MR scanners face inaccuracies in attenuation correction.
Innovation Solution
A computer-implemented method using LSO/LYSO background radiation data to generate accurate attenuation maps through a trained model, such as a neural network, to correct for attenuation in nuclear imaging without requiring additional CT scans, thereby reducing radiation exposure and improving map accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional CT scans are performed to obtain attenuation map information, then attenuation correction accuracy is improved, but radiation dose to the patient increases
Solution Approach 1:
The patent extracts the attenuation map generation function from the CT scanner and relocates it to the PET detector system by utilizing background radiation data. This extraction eliminates the need for separate CT scans while maintaining attenuation correction capability, directly resolving the contradiction between accuracy and radiation dose.
Solution Approach 2:
The PET detector system performs attenuation correction for itself by utilizing its own background radiation data to generate attenuation maps. This self-service approach eliminates dependency on external CT scans, achieving both accurate attenuation correction and reduced radiation exposure.
2Device complexity
If Dixon sequence is used to derive attenuation maps in PET-MR scanners, then system complexity is reduced, but map accuracy deteriorates
Solution Approach 1:
The patent changes the fundamental parameter used for attenuation map generation from Dixon sequence-derived data to background radiation data from LSO/LYSO detectors. This parameter change maintains system simplicity while dramatically improving map accuracy, as background radiation data directly reflects the actual attenuation characteristics.
3Adaptability or versatility
If traditional attenuation correction methods are used, then compatibility with existing systems is maintained, but image quality deteriorates due to inaccuracies
Solution Approach 1:
The patent makes the PET detector system multi-functional by enabling it to perform both primary PET imaging and attenuation map generation using background radiation data. This universal approach maintains compatibility with existing PET systems while improving image quality through accurate attenuation correction.
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 allows for accurate attenuation correction in nuclear imaging, reducing radiation dose and system size, and enhancing image quality by using LSO/LYSO-based background radiation data, which is more precise than traditional methods.
Implementation Method 1
attenuation correction of nuclear imaging obtained using lutetium oxyorthosilicate (LSO) or lutetium yttrium oxyorthosilicate (LYSO) scintillation crystals
Data Source
AI summary
Various systems and computer-implemented methods for background radiation based attenuation correction are disclosed. Nuclear scan data including scan data associated with a first imaging modality and background radiation data are received. An initial background radiation attenuation map is generated and provided to a trained model configured to generate a final background radiation based attenuation map from the initial background radiation attenuation map. Attenuation correction of the scan data associated with the first imaging modality is performed based on the background radiation based attenuation map and a nuclear image is reconstructed from attenuation corrected scan data associated with the first imaging modality.