Complex Averaging for Diffusion-Weighted Imaging - USA

SIEMENS Healthineers Complex Averaging for Diffusion-Weighted Imaging Job Aid Template Effective Date: 10 Aug 2021 | HILS 2223 Effective Date: 14 Jan 2024 | QR700004347 Unrestricted © Siemens Healthineers, 2024 Complex Averaging SIEMENS Healthineers Table of contents How can it help you? 3 How does it work? 4 How can you use it? 5 Where can you use it? 6 R 2D SL Image examples 7 SPC 3.0 10cm 10cm Saving the Results 15 PACS Ready Mode 16 How to ensure suitable performance 17 2 Effective Date: 14 Jan 2024 | QR700004347 Unrestricted © Siemens Healthineers, 2024 Complex Averaging SIEMENS Healthineers How can it help you? Diffusion weighted images are sensitive to MAGN COMP phase variations among averages, such as subject motion or even possible system interferences during the diffusion preparation. Magnitude (MAGN) averaging has been R R 2D 2D conventionally used, due to lower sensitivity to SL SPC 6.0 SL SPC phase variations. 10 cm 10cm Compared with the magnitude (MAGN) averaging, the Complex (COMP) averaging can enhance the Signal-to-Noise ratio (SNR) in areas with low local SNR and improve the image appearance. 3 Effective Date: 14 Jan 2024 | QR700004347 Unrestricted © Siemens Healthineers, 2024 Complex Averaging How does it work? Complex Averaging works in two steps: 1. Global phase correction between averages Uses a method DWI RESOLVE-like* to estimate and correct the phase • • Removes the low-order phase variations across averages 2. Adaptive combination of complex-valued images • Alignment of local phase variations between images Please note: • Complex Averaging is only compatible with non-DTI diffusion modes and with Adaptive Coil Combine. • When using Complex Averaging, it is normal to have an Apparent Diffusion Coefficient (ADC) increase, due to noise bias removal. * = DWI RESOLVE is a readout-segmented, multi-shot EPI for reduced TE and encoding time. RESOLVE uses motion correction with 2D phase navigator and real-time image reacquisition. 4 Effective Date: 14 Jan 2024 | QR700004347 Unrestricted © Siemens Healthineers, 2024 Complex Averaging How can you use it? Clinical Applications: Routine Contrast Resolution Geometry System Physio Diff Inline Sequence Diffusion Mode 4-Scan Trace Diff. Weighted Images [] a) Images with regions where inherent SNR is low benefit Diff. Directions Trace Weighted Images v more from the use of Complex Averaging. Diffusion Scheme Monopolar b) A higher number of Averages in Complex Averaging Diff. Weightings 2 provides more visible improvements. b-value Averages ADC Maps M 50 2 2 800 + 16 Exponential ADC Maps b-value >= 0 s/mm2 Complex Averaging 1 ADC Noise Threshold 0 How to set Complex Averaging: Dynamic Field Correction ... Noise Masking 1. You can activate it on the Diff tab card: Click on the Invert Gray Scale Calculated b-value checkbox Complex Averaging. 2. You can increase the number of averages in the b-value and Averages field. 5 Effective Date: 14 Jan 2024 | QR700004347 Unrestricted © Siemens Healthineers, 2024 Complex Averaging SIEMENS Healthineers Where can you use it? You can use diffusion-weighted imaging with complex averaging in the following body regions: Thorax & Abdomen Pelvis Neck soft tissue Head C-Spine T-Spine L-Spine 6 Effective Date: 14 Jan 2024 | QR700004347 Unrestricted © Siemens Healthineers, 2024 Complex Averaging SIEMENS Healthineers Example images* Abdomen Abdomen ed2d_diff_b50_800_tra_p2 ed2d_diff_b50_800_tra_p2 Complex Averaging OFF Complex Averaging ON R R 2D 2D SL 5.0 SL 5.0 SPC 6.0 SPC 6.0 10cm 10cm *Images are acquired on a MAGNETOM Cima.X system. 7 Effective Date: 14 Jan 2024 | QR700004347 Unrestricted © Siemens Healthineers, 2024 Complex Averaging SIEMENS Healthineers Example images* Abdomen Abdomen ep2d_diff_b50_800_tra_p2 ep2d_diff_b50_800_tra_p2 Complex Averaging OFF Complex Averaging ON R R 2D 2D SL 5.0 SL 5.0 SPC 6.0 SPC 6.0 10cm 10cm *Images are acquired on a MAGNETOM Cima.X system 8 Effective Date: 14 Jan 2024 | QR700004347 Unrestricted © Siemens Healthineers, 2024 Complex Averaging SIEMENS Healthineers Example images* Thorax Thorax ep2d_diff_b50_800_tra_p2 ep2d_diff_b50_800_tra_p2 Complex Averaging OFF Complex Averaging ON R R 2D 2D SL 5.0 SL 5.0 SPC 6.0 SPC 6.0 10cm 10cm *Images are acquired on a MAGNETOM Cima.X system 9 Effective Date: 14 Jan 2024 | QR700004347 Unrestricted © Siemens Healthineers, 2024 Complex Averaging SIEMENS Healthineers Example images* Thorax Thorax ep2d_diff_b50_800_tra_p2 ep2d_diff_b50_800_tra_p2 Complex Averaging OFF Complex Averaging ON LLU R R 2D 2D SL 5.0 SL 5.0 SPC 6.0 SPC 6.0 10cm 10cm *Images are acquired on a MAGNETOM Cima.X system 10 Effective Date: 14 Jan 2024 | QR700004347 Unrestricted © Siemens Healthineers, 2024 Complex Averaging SIEMENS Healthineers Example images* Abdomen Abdomen ep2d_diff_fs_b50_800_tra_p2 ep2d_diff_fs_b50_800_tra_p2 Complex Averaging OFF Complex Averaging ON R R 2D 2D SL 6.0 SL 6.0 SPC SPC 7.2 10cm 10cm *Images are acquired on a MAGNETOM Free.Max system 11 Effective Date: 14 Jan 2024 | QR700004347 Unrestricted © Siemens Healthineers, 2024 Complex Averaging SIEMENS Healthineers Example images* Abdomen Abdomen ep2d_diff_fs_b50_800_tra_p2 ep2d_diff_fs_b50_800_tra_p2 Complex Averaging OFF Complex Averaging ON R R 2D 2D SL 6.0 SL 6.0 SPO 7.2 SPC 7.2 10cm 10cm *Images are acquired on a MAGNETOM Free.Max system 12 Effective Date: 14 Jan 2024 | QR700004347 Unrestricted © Siemens Healthineers, 2024 Complex Averaging SIEMENS Healthineers Example images* Thorax Thorax ep2d_diff_stir_b50_800_tra_p2 ep2d_diff_stir_b50_800_tra_p2 Complex Averaging OFF Complex Averaging ON ... R R 2D 2D ...................................................................... SL 6.0 SL 6.0 SPC 7.2 SPC 10cm 10cm ........................................................................................... *Images are acquired on a MAGNETOM Free.Max system 13 Effective Date: 14 Jan 2024 | QR700004347 Unrestricted © Siemens Healthineers, 2024 Complex Averaging SIEMENS Healthineers Example images* Thorax Thorax ep2d_diff_b50_800_tra_p2 ep2d_diff_b50_800_tra_p2 Complex Averaging OFF Complex Averaging ON R R 2D 2D SL 6.0 SL 6.0 SPC 72 SPC 72 10cm 10cm LLLLL *Images are acquired on a MAGNETOM Free.Max system 14 Effective Date: 14 Jan 2024 | QR700004347 Unrestricted © Siemens Healthineers, 2024 SIEMENS Healthineers Please note this learning material is for training purposes only. For the proper use of the software or hardware, please always use the Operator Manual or Instructions for Use (hereinafter collectively “Operator Manual”) issued by Siemens Healthineers. This material is to be used as training material only and shall by no means substitute the Operator Manual. Any material used in this training will not be updated on a regular basis and does not necessarily reflect the latest version of the software and hardware available at the time of the training. The Operator Manual shall be used as your main reference, in particular for relevant safety information like warnings and cautions. Please note: Some functions shown in this material are optional and might not be part of your system. Certain products, product related claims or functionalities (hereinafter collectively “Functionality”) may not (yet) be commercially available in your country. Due to regulatory requirements, the future availability of said Functionalities in any specific country is not guaranteed. Please contact your local Siemens Healthineers sales representative for the most current information. The reproduction, transmission or distribution of this training or its contents is not permitted without express written authority. Offenders will be liable for damages. All names and data of patients, parameters and configuration dependent designations are fictional and examples only. All rights, including rights created by patent grant or registration of a utility model or design, are reserved. © Siemens Healthineers AG Siemens Healthineers Headquarters Siemens Healthineers AG Siemensstr. 3 91301 Forchheim, Germany Telephone: +49 9191 18-0 siemens-healthineers.com 15 Effective Date: 14 Jan 2024 | QR700004347 Unrestricted © Siemens Healthineers, 2024