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Real-time 3D MR Respiratory Motion Acquisition for Simultaneous PET-MR Imaging
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Transcript of Real-time 3D MR Respiratory Motion Acquisition for Simultaneous PET-MR Imaging
Real-time 3D MR Respiratory Motion Acquisition for SimultaneousPET / MR Imaging
Liheng Guo1, Mark Ahlman3, Tao Feng2, Michael Guttman4, Elliot McVeigh1,David Bluemke3, Benjamin Tsui2, Daniel Herzka1
1Biomedical Engineering, Johns Hopkins University, Baltimore, MD2Department of Radiology, Johns Hopkins University, Baltimore, MD3Radiology and Imaging Sciences, National Institutes of Health, Bethesda, MD4Cardiology, School of Medicine, Johns Hopkins University, Baltimore, MD
Podium Presentation. Annual Meeting of the International Society for Nuclear Medicine and Molecular Imaging (SNMMI). St. Louis, MO. June 11, 2014.
Liheng GuoSNMMI 2014
Motivation• Breathing motion corrupts positron emission tomography (PET) images
Goerres, et al. %Respiration-induced Attenuation Artifact at PET/CT: Technical Considerations. Radiology. 2003; 226:906–910.
Liver
Lung
TimeHeart
http://www.siemens.com/press/en/presspicture/
Positron Emission Tomography (PET)
Motion-induced false signal void
Objective• To track breathing motion in 3D in real time, using simultaneous PET-MRI• To generate 3D motion vector field to correct PET images
http://www.siemens.com/press/en/events/healthcare/2010-11-Biograph-mMR.php
Method: Imaging Data Acquisition• Radial 3D MRI
Barger, et al. MRM 2002;48:297-305
• Golden Angle Sampling Pattern500 views
1000
2000
Early Late
Method: Image Reconstruction
Imaging Data Acquisition
. . .
• Sliding window frames• Iterative compressed-sensing reconstruction in 3D wavelet domain
Frame 1 Frame 2 Frame 3 Frame 4
Coronal View(slice 60 of 128)
Coronal Projection(all slices)
MotionVector Field
(slice 60 of 128)
3.1×3.1×3.1mm3 voxels 2s temporal res 4D registration
Results: Real-Time 3D Images• Sufficient Resolution for Motion Mapping