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Attenuation correction synthesis for hybrid PET-MR scanners
Ninon Burgos1, Manuel Jorge Cardoso1, Marc Modat1
1Centre for Medical Image Computing, University College London, London, UK.
Medical Image Computing and Computer-Assisted Intervention : MICCAI ... International Conference on Medical Image Computing and Computer-Assisted Intervention
|February 8, 2014
Summary
This study introduces a novel method to create synthetic CT scans from MRI data, improving PET/MR imaging accuracy. This technique enhances PET reconstruction without additional radiation exposure for patients.
Area of Science:
- Medical Imaging
- Radiology
- Biophysics
Background:
- Hybrid PET/CT systems improve PET reconstruction using CT-derived attenuation maps.
- CT offers limited soft-tissue contrast and adds radiation dose.
- MRI provides superior soft-tissue contrast but lacks electron density information for PET.
Purpose of the Study:
- To enhance Positron Emission Tomography/Magnetic Resonance Imaging (PET/MR) reconstruction.
- To generate synthetic Computed Tomography (CT) images and attenuation maps from MRI data.
- To improve PET reconstruction accuracy in PET/MR systems.
Main Methods:
- A multi-atlas information propagation scheme was employed.
- Patient-specific MRI morphology was matched to a database of pre-acquired MRI/CT pairs.
- Synthetic CTs and attenuation maps were generated for PET/MR reconstruction.
Main Results:
- The proposed method demonstrated improved CT synthesis accuracy.
- PET reconstruction accuracy was enhanced compared to traditional segmentation methods.
- The technique utilized Ultrashort-Echo-Time (USET) MRI sequences.
Conclusions:
- Generating synthetic CTs from MRI data is a viable approach to improve PET/MR imaging.
- This method offers a radiation-free alternative for obtaining attenuation maps.
- The multi-atlas propagation scheme shows promise for accurate PET/MR reconstruction.
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