Motion vector field phase-to-amplitude resampling for 4D motion-compensated cone-beam CT.

Motion vector field phase-to-amplitude resampling for 4D motion-compensated cone-beam CT. Phys Med Biol. 2017 Dec 13;: Authors: Sauppe S, Kuhm J, Brehm M, Paysan P, Seghers D, Kachelriess M Abstract We propose a phase-to-amplitude resampling (PTAR) method to reduce motion blurring in motion-compensated (MoCo) 4D cone-beam CT (CBCT) image reconstruction, without increasing the computational complexity of the motion vector field (MVF) estimation approach. PTAR is able to improve the image quality in reconstructed 4D volumes including both regular and irregular respiration patterns. The PTAR approach starts with a robust phase gating procedure for the initial MVF estimation and then switches to a phase-adapted amplitude gating method. The switch implies a MVF-resampling, which makes them amplitude-specific. PTAR ensures that the MVFs, which have been estimated on phase-gated reconstructions, are still valid for all amplitude-gated reconstructions. To validate the method we use an artificially deformed clinical CT scan with a realistic breathing pattern and several patient data sets acquired with a TrueBeam™ integrated imaging system (Varian Medical Systems, Palo Alto, CA, USA). Motion blurring, that still occurs around the area of the diaphragm or at small vessels above the diaphragm in artifact-specific cyclic motion compensation (acMoCo) images based on phase-gating, is significantly reduced by PTAR. Also, small lung structures...
Source: Physics in Medicine and Biology - Category: Physics Authors: Tags: Phys Med Biol Source Type: research

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