ACR MR Clinical Pixel Area Size Voxel Volume - Numaris X

ACR Clinical Images Pixel Area, Size & Voxel Volume Numaris X Job Aid ACR Clinical Images – Find Pixel Area/Voxel/Volume for Numaris X This Job Aid is not meant to replace the ACR documentation. Please refer to the MR ACR website. www.acr.org regarding the latest documentation for MRI ACR Clinical Image Testing. 1. Pixel/Voxel Dimensions a. FoV Read – Field-of-View in Frequency Encoding Direction (FOVf) b. FoV Phase – Field-of-View in Phase Encoding Direction (FOVp) c. Slice Thickness (ST) d. Base Resolution – Number of Frequency Encoding Steps [Frequency/Read Matrix (Nf)] e. Phase Resolution – Number of Phase Encoding Steps [Phase Matrix (Np)] 4:38 min 4 Manual 2 2 3.0.3-0 3-4.0 mm + 1,00 Routine Contrast Resolution Geometry System Physio Inline Sequence Common Acceleration | Filter FoV Read 220 4 mm Trajectory Cartesian FoV Phase 100 0 ¢ % Slice Thickness 4.0 - mm Base Resolution 320 ¢ Phase Resolution 80 % Interpolation v 2. Inplane Pixel Resolution – Hover over Voxel Size (example: 0.7x0.7x4.0 mm) to see Reconstructed and Acquisition Voxel Sizes a. Reconstruction – Reconstruced Voxel Size (e.g., voxel size changes if Interpolation selected/deselected) b. Acquisition – Acquired Voxel Size (use to calculate ACR in-plane pixel sizes) c. First Number – Phase Pixel d. Second Number – Frequency Pixel e. Third number – Slice Thickness (mm) @ 0.7x0.7×4.0 mm 1.00 Inline Voxel Size Reconstruction: 0.69x0.69×4.00 mm Acquisition: 0.86x0.69x4.00 mm Unrestricted 0 Published by Siemens Healthcare GmbH © Siemens Healthcare GmbH, 2020 SIEMENS Master Template Effective Date: 3/5/2020 | HOOD05162003074494 Job Aid Effective Date: 10/07/2020 | HOOD05162003132188 Healthineers Job Aid | ACR MR Clinical Images – Pixel Area, Size & Voxel Volume - Numaris X Job Aid Effective Date: 10/07/2020 | HOOD05162003132188 $ 43 3. Phase Direction Pixel Size (FoVp/Np) Routine Contrast Resouillon Geometry a. Field-of-View in Phase Encoding Direction Common Acceleration Filter (FOVp) ÷ Number of Steps in Phase Encoding FoV Read 220 - mm (Np) FoV Phase 100 0 % i. Example: FOV Phase (220) ÷ Phase Slice Thickness 4.0 - mm Resolution (256) = .859375 Resolution 320 Phase Resolution 80 % 4. Read/Frequency Direction Pixel Size (FoVf/Nf) a. Field-of-View in Read/Frequency Encoding Routine Contrast Resolution Geometr Direction (FOVf) ÷ Number of Steps in Common Acceleration Filter Read/Frequency Encoding (Nf) FoV Read 220 4 mm: i. Example: FOV Read (220) ÷ Base FoV Phase 100.0 % Resolution (320) = 0.6875 Slice Thickness 4.0 - mm Basa Resolution 320+ Phase Reisolution 80 5. Pixel Area (2D Sequences) 0.7x0.7x4.0 mm 1.00 a. Pixel Area = Acquired Phase Pixel Size x Read/Frequency Pixel Size Inline Voxel Size Reconstruction: 0.69x0.69x4.00 mm i. e.g., [0.86x0.69 = 0.5934] Acquisition: 0.86x0.69x4.00 mm 6. Voxel Volume (3D Sequences) 0.7x0.7x4.0 mm ₱ 1.00 a. Voxel Volume = Acquired Phase Pixel Size x Frequency Pixel Size x Slice Inline Voxel Size Reconstruction: 0.69x0.69x4.00 mm Thickness Acquisition: 0.86x0.69x4.00 mm i. e.g., [0.86x0.69x4.00 = 2.3736] Routine Contrast Resolution Geometry 7. Slice Thickness (3D Sequences): Slice Thickness ÷ Acceleration Filter Slice Resolution FoV Read 240 + mm a. e.g., [0.9÷0.51= 1.76] FaV Phase 100.0 ¢ % Slice Thickness 0.9 - mm Base Rasolution 256 ¢ Phase Reschition 100 - 90 Slice Resolution 51 % SIEMENS Unrestricted 0 Published by Siemens Healthcare GmbH © Siemens Healthcare GmbH, 2020 Master Template Effective Date: 3/5/2020 | HOOD05162003074494 Healthineers Job Aid Effective Date: 10/07/2020 | HOOD05162003132188 Page 2 of 3 Job Aid | ACR MR Clinical Images – Pixel Area, Size & Voxel Volume - Numaris X Job Aid Effective Date: 10/07/2020 | HOOD05162003132188 Please note that the learning material is for training purposes only! 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Copyright © Siemens Healthcare GmbH 2020 Siemens Healthineers Headquarters Siemens Healthcare GmbH Henkestr. 127 91052 Erlangen, Germany Phone: +49 9131 84-0 siemens-healthineers.com SIEMENS Unrestricted 0 Published by Siemens Healthcare GmbH © Siemens Healthcare GmbH, 2020 Master Template Effective Date: 3/5/2020 | HOOD05162003074494 Healthineers Job Aid Effective Date: 10/07/2020 | HOOD05162003132188 Page 3 of 3