PURPOSE: To  apply a novel self-gating k-space sorted 4-dimensional MRI (SG-KS-4D-MRI) method to overcome limitations due to anisotropic resolution and rebinning artifacts and to monitor @entity788 motion. METHODS AND MATERIALS: Ten @entity1 were imaged using 4D-CT, cine 2-dimensional MRI (2D-MRI), and the SG-KS-4D-MRI, which is a spoiled gradient recalled echo sequence with 3-dimensional radial-sampling k-space projections and 1-dimensional projection-based self-gating. @entity5 volumes were defined on all phases in both 4D-MRI and 4D-CT and then compared. RESULTS: An isotropic resolution of 1.56  mm was achieved in the SG-KS-4D-MRI images, which showed superior soft-tissue contrast to 4D-CT and appeared to be  free of stitching artifacts. The @entity5 motion trajectory cross-correlations (mean      SD)  between SG-KS-4D-MRI and cine 2D-MRI in superior-inferior, anterior-posterior, and medial-lateral directions were 0.93      0.03, 0.83      0.10, and 0.74      0.18, respectively. The @entity5 motion trajectories cross-correlations between SG-KS-4D-MRI and 4D-CT in superior-inferior, anterior-posterior, and medial-lateral directions were 0.91      0.06, 0.72      0.16, and 0.44      0.24, respectively. The average standard deviation of gross @entity5 volume calculated from  the 10 breathing phases was 0.81  cm(3) and 1.02  cm(3) for SG-KS-4D-MRI and 4D-CT, respectively (P=.012). CONCLUSIONS: A novel SG-KS-4D-MRI acquisition method capable of reconstructing rebinning artifact-free, high-resolution 4D-MRI images was used to quantify @entity5 motion. The resultant @entity788 motion trajectories agreed well with 2D-cine-MRI and 4D-CT. The @entity788 volumes shown in the different phases for the SG-KS-4D-MRI were statistically significantly more consistent than those in the 4D-CT.

Four-Dimensional Magnetic Resonance Imaging  With 3-Dimensional Radial Sampling and Self-Gating-Based K-Space Sorting: Early Clinical Experience on XXXX @entity1 .

@entity1 :: ('9606', 'Species') :: ['patients'] @entity788 :: ('MESH:D010190', 'Disease') :: ['pancreatic tumor'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor', 'Tumor', 'pancreas tumor']
@entity788 :: (MESH:D010190,Disease) :: ['Pancreatic Cancer']
