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MRI Artifact Reduction and Quality Improvement in the Upper Abdomen with PROPELLER and Prospective Acquisition Correction (PACE) Technique

¹ All authors: Department of Diagnostic Radiology, Kyoto University Graduate School of Medicine, 54, Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan.

View larger version (3K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 1A —Illustration of BLADE (proprietary name for periodically rotated overlapping parallel lines with enhanced reconstruction [PROPELLER] in MR systems from Siemens Medical Solutions) k-space data acquisition. Single blade in k-space, composed of L phase encoded lines corresponds to full image set with very low resolution in phase-encoding direction.

View larger version (62K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 1B —Illustration of BLADE (proprietary name for periodically rotated overlapping parallel lines with enhanced reconstruction [PROPELLER] in MR systems from Siemens Medical Solutions) k-space data acquisition. Each blade contains phase-encoding lines. Graphic shows complete set of trajectories for BLADE data, composed of rotated stripes.

View larger version (170K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 2A —25-year-old healthy volunteer. Conventional fat-saturated T2-weighted turbo spin-echo axial image with respiratory-triggered acquisition (A) shows marked artifacts including ghosting artifact. Artifact is markedly improved after motion correction on the BLADE (proprietary name for periodically rotated overlapping parallel lines with enhanced reconstruction [PROPELLER] in MR systems from Siemens Medical Solutions) MR image (B).

View larger version (124K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 2B —25-year-old healthy volunteer. Conventional fat-saturated T2-weighted turbo spin-echo axial image with respiratory-triggered acquisition (A) shows marked artifacts including ghosting artifact. Artifact is markedly improved after motion correction on the BLADE (proprietary name for periodically rotated overlapping parallel lines with enhanced reconstruction [PROPELLER] in MR systems from Siemens Medical Solutions) MR image (B).

View larger version (124K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 3A —38-year-old healthy volunteer. Conventional fat-saturated T2-weighted turbo spin-echo axial image with respiratory-triggered acquisition (A) shows blurred resolution of liver edge and poor depiction of intrahepatic vessels. Much better sharpness of liver edge and clearer depiction of intrahepatic vessels were seen on BLADE (proprietary name for periodically rotated overlapping parallel lines with enhanced reconstruction [PROPELLER] in MR systems from Siemens Medical Solutions) MR image (B).

View larger version (125K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 3B —38-year-old healthy volunteer. Conventional fat-saturated T2-weighted turbo spin-echo axial image with respiratory-triggered acquisition (A) shows blurred resolution of liver edge and poor depiction of intrahepatic vessels. Much better sharpness of liver edge and clearer depiction of intrahepatic vessels were seen on BLADE (proprietary name for periodically rotated overlapping parallel lines with enhanced reconstruction [PROPELLER] in MR systems from Siemens Medical Solutions) MR image (B).

View larger version (125K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4A —32-year-old healthy volunteer. Conventional fat-saturated T2-weighted turbo spin-echo axial image with a respiratory-triggered acquisition (A) shows obscure depiction of organs such as spleen, kidney, pancreas, and intestine. Depiction of organs was improved on BLADE (proprietary name for periodically rotated overlapping parallel lines with enhanced reconstruction [PROPELLER] in MR systems from Siemens Medical Solutions) MR image (B).

View larger version (104K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4B —32-year-old healthy volunteer. Conventional fat-saturated T2-weighted turbo spin-echo axial image with a respiratory-triggered acquisition (A) shows obscure depiction of organs such as spleen, kidney, pancreas, and intestine. Depiction of organs was improved on BLADE (proprietary name for periodically rotated overlapping parallel lines with enhanced reconstruction [PROPELLER] in MR systems from Siemens Medical Solutions) MR image (B).

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