Topogram-Based Localization and Attenuation Mapping for SPECT
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Solution Overview
Problem
Existing emission tomography methods, such as SPECT and PET, face challenges in accurately localizing anatomy and estimating attenuation maps, particularly in cardiac imaging, leading to high radiation doses due to the need for full CT scans.
Innovation Solution
Utilize a limited number of x-ray topograms to localize anatomy and generate attenuation maps without a full CT scan, using triangulation and model fitting to reduce radiation exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a full CT scan is performed to generate attenuation maps and localize anatomy, then imaging accuracy and anatomical localization are improved, but radiation dose to the patient increases significantly
Solution Approach 1:
The patent segments the CT scan into only the essential topogram views (anterior-posterior and lateral) rather than performing a complete helical CT scan. This selective acquisition of only the necessary projection images reduces radiation dose while maintaining sufficient anatomical information for localization and attenuation map generation.
Solution Approach 2:
The patent extracts only the critical anatomical localization information from the full CT scan process by using topograms. The topograms contain the essential projection data needed for determining anatomical structures and generating attenuation maps, eliminating the need for the complete helical scan and its associated radiation dose.
2Measurement precision
If a full CT scan is performed to calculate attenuation corrections for accurate SPECT quantification, then quantification accuracy is improved, but radiation dose increases
Solution Approach 1:
The patent segments the attenuation map generation process by using only topogram projections instead of requiring the complete helical CT dataset. The topograms provide sufficient attenuation information for accurate SPECT quantification while reducing the total radiation exposure from the CT component.
3Measurement precision
If higher energy and longer duration CT acquisition is used for sharper spatial resolution, then anatomical resolution is improved, but radiation dose and scan time increase
Solution Approach 1:
The patent applies partial action by acquiring only the necessary topogram projections (anterior-posterior and lateral views) rather than performing a complete helical CT scan. This partial acquisition provides sufficient spatial resolution information for anatomical localization and attenuation mapping while significantly reducing radiation dose and scan time.
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
Achieves accurate localization and attenuation mapping with significantly lower radiation doses, improving the precision of emission imaging by pinpointing anatomy and reducing patient exposure to ionizing radiation.
Implementation Method 1
One, two, or a few topograms without a full CT scan are used to localize, such as through triangulation
Implementation Method 2
Various approaches for detecting emissions may be used, such as Single Photon Computed Tomography (SPECT)
Implementation Method 3
The emissions pass through the body of the patient, so are subject to attenuation
Data Source
AI summary
In emission imaging, one, two, or a few topograms without a full CT scan are used to localize, such as through triangulation, and/or generate an attenuation map, such as based on model fitting. A limited radiation exposure, rather than a longer, larger full CT exposure, is needed to localize and/or provide attenuation correction for emission imaging, such as cardiac SPECT imaging.