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Attenuation correction of four dimensional (4D) PET using phase-correlated 4D-computed tomography
Falk Pönisch1, Christian Richter, Uwe Just
1OncoRay-Radiation Research in Oncology, Medizinische Fakultät Carl Gustav Carus, TU Dresden, Fetscherstrasse 74, PF 86, 01307 Dresden, Germany. fpoenisch@mdanderson.org
Physics in Medicine and Biology
|June 20, 2008
Summary
Respiratory motion degrades PET/CT image quality. A modified Siemens Biograph 16 scanner now provides true 4D-PET/4D-CT imaging, enabling phase-correlated attenuation correction for improved accuracy.
Area of Science:
- Medical Imaging
- Nuclear Medicine
- Radiology
Background:
- Conventional positron emission tomography (PET)/computed tomography (CT) imaging quality is compromised by respiratory motion.
- Three-dimensional (3D) image acquisition leads to inaccurate attenuation correction due to motion artifacts.
- Time-resolved (4D) data acquisition is essential to mitigate these motion-related issues.
Purpose of the Study:
- To modify a Siemens Biograph 16 PET/CT scanner for true 4D-PET/4D-CT imaging.
- To implement phase-correlated attenuation correction for enhanced image accuracy.
- To validate the functionality of the upgraded 4D-PET/4D-CT system.
Main Methods:
- Modification of a Siemens Biograph 16 PET/CT scanner to enable 4D data acquisition for both PET and CT.
- Implementation of phase-correlated attenuation correction algorithms.
- Experiments using a two-dimensional respiratory motion phantom to assess system performance.
Main Results:
- The modified scanner successfully achieved true 4D-PET/4D-CT imaging capabilities.
- Experiments demonstrated good spatial correlation and temporal synchronization between 4D-PET and 4D-CT data.
- Analysis confirmed accurate reconstruction of phantom motion patterns and activity distribution, with validated image volumes.
Conclusions:
- The developed 4D-PET/4D-CT imaging system effectively overcomes respiratory motion artifacts.
- Phase-correlated attenuation correction using synchronized 4D-CT data significantly improves PET image quality.
- Reconstructing 4D-PET data with 4D-CT data acquired on the same machine is a feasible and recommended procedure.
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