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mrs using siemens' shim optimization algorithm  (Siemens AG)

 
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    Siemens AG mrs using siemens' shim optimization algorithm
    Mrs Using Siemens' Shim Optimization Algorithm, supplied by Siemens AG, used in various techniques. Bioz Stars score: 90/100, based on 1 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
    https://www.bioz.com/product/shim+algorithm/mrs+using+siemens++shim+optimization+algorithm/pm39188098-46-16-18
    Average 90 stars, based on 1 article reviews
    mrs using siemens' shim optimization algorithm - by Bioz Stars, 2026-11
    90/100 stars

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    Related Articles

    Spectroscopy:

    Article Title: On the impact of B0 shimming algorithms on single-voxel MR spectroscopy.
    Article Snippet: .. The remainder of the scanning session can be broken down into two steps: 2.1.1 Step 1: MRS using Siemens’ shim optimization algorithm (a) A Point REsolved SpectroScopy (PRESS) sequence was used to position a 20 x 20 x 20 mm3 MRS voxel in the PFC. .. A B0 shim box was centered on the MRS voxel and set to cover ∼26 x 26 x 26 mm3. (b) The initial B0 shim coefficients were set to the system’s “Tune up” values and a central frequency (f0) adjustment was performed. (c) Next, a whole-brain B0 map was acquired using the “brain” B0 mapping protocol (3D dual-echo GRE, TR= 9 ms, TE1/TE2: 2.39/7.17 ms, 64 x 54 matrix, 26 slices, FA= 15◦, 4.4 mm3 isotropic resolution, total acquisition time= 11 s), which is pre-defined by Siemens and can be selected among a list of B0 mapping protocols within Siemens’ B0 shimming tool. (d) Siemens’ proprietary shim algorithm was run using the acquired whole-brain B0 map and the B0 shim box. (e) The resulting shim coefficients were applied and f0 was re-adjusted. (f) After B0 shimming, the PRESS sequence (TR= 2000 ms, TE= 135 ms, BW= 1200 Hz, voxel size: 20 x 20 x 20 mm3, total acquisition time= 4 m 26 s) was acquired. (g) This was followed by a 3D dual-echo GRE sequence with a protocol that was set to match that of Siemens’ “brain” B0 mapping sequence.

    Sequencing:

    Article Title: On the impact of B0 shimming algorithms on single-voxel MR spectroscopy.
    Article Snippet: .. The remainder of the scanning session can be broken down into two steps: 2.1.1 Step 1: MRS using Siemens’ shim optimization algorithm (a) A Point REsolved SpectroScopy (PRESS) sequence was used to position a 20 x 20 x 20 mm3 MRS voxel in the PFC. .. A B0 shim box was centered on the MRS voxel and set to cover ∼26 x 26 x 26 mm3. (b) The initial B0 shim coefficients were set to the system’s “Tune up” values and a central frequency (f0) adjustment was performed. (c) Next, a whole-brain B0 map was acquired using the “brain” B0 mapping protocol (3D dual-echo GRE, TR= 9 ms, TE1/TE2: 2.39/7.17 ms, 64 x 54 matrix, 26 slices, FA= 15◦, 4.4 mm3 isotropic resolution, total acquisition time= 11 s), which is pre-defined by Siemens and can be selected among a list of B0 mapping protocols within Siemens’ B0 shimming tool. (d) Siemens’ proprietary shim algorithm was run using the acquired whole-brain B0 map and the B0 shim box. (e) The resulting shim coefficients were applied and f0 was re-adjusted. (f) After B0 shimming, the PRESS sequence (TR= 2000 ms, TE= 135 ms, BW= 1200 Hz, voxel size: 20 x 20 x 20 mm3, total acquisition time= 4 m 26 s) was acquired. (g) This was followed by a 3D dual-echo GRE sequence with a protocol that was set to match that of Siemens’ “brain” B0 mapping sequence.



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