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Regarding testing gradient system after the installation of a new set. As you know Siemens provides many tools to test the gradients including simple tests such as “Image Orientation” and more sophisticated tests such as Cross Term compensation</div>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Regarding testing gradient system after the installation of a new set.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">As you know Siemens provides many tools to test the gradients including simple tests such as “Image Orientation” and more sophisticated tests such as Cross Term compensation to check that the
Maxwell terms are compensated correctly. I have seen a case where the cables connected to the gradients were reversed and that would show up on the “Image Orientation” check. To ensure the gradients are performing correctly after this update I would run all
the tests provided. However, before I started the tests, I would run the “Long Term Stability” test. This particular test ramps the gradients up and down to their maximum value. The point of it is to really shake the gradients to ensure everything is bolted
down properly. Running this test should provide a good evaluation of how well the new gradients are attached to the magnet. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Many of the tests use a large, 30 cm diameter sphere. Before you start confirm that the sphere is pretty much filled. The diameter of the image of the sphere is used to fix the gradient calibration
and so getting that coefficient correct will be important.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><b><i><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#1F497D;border:none windowtext 1.0pt;padding:0in;mso-ligatures:standardcontextual">Peter Hardy, PhD</span></i></b><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#1F497D;mso-ligatures:standardcontextual"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#1F497D;border:none windowtext 1.0pt;padding:0in;mso-ligatures:standardcontextual">Associate Professor of Radiology, Neuroscience and Biomedical
Engineering</span><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#242424;mso-ligatures:standardcontextual"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#1F497D;border:none windowtext 1.0pt;padding:0in;mso-ligatures:standardcontextual">Faculty, Division of Diagnostic & Nuclear Medical Physics</span><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#242424;mso-ligatures:standardcontextual"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#1F497D;border:none windowtext 1.0pt;padding:0in;mso-ligatures:standardcontextual">Department of Radiology</span><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#242424;mso-ligatures:standardcontextual"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#1F497D;border:none windowtext 1.0pt;padding:0in;mso-ligatures:standardcontextual">University of Kentucky College of Medicine</span><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#242424;mso-ligatures:standardcontextual"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#1F497D;border:none windowtext 1.0pt;padding:0in;mso-ligatures:standardcontextual">UK HealthCare<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#1F497D;border:none windowtext 1.0pt;padding:0in;mso-ligatures:standardcontextual">800 Rose Street, Room HX-307</span><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#1F497D;mso-ligatures:standardcontextual"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#1F497D;border:none windowtext 1.0pt;padding:0in;mso-ligatures:standardcontextual">Lexington, KY 40536-0293</span><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#1F497D;mso-ligatures:standardcontextual"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#1F497D;border:none windowtext 1.0pt;padding:0in;mso-ligatures:standardcontextual">Phone: (859) 323-2954</span><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#1F497D;mso-ligatures:standardcontextual"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#1F497D;mso-ligatures:standardcontextual">Email:
<a href="mailto:peter.hardy@uky.edu"><span style="color:#0563C1">peter.hardy@uky.edu</span></a></span><span style="font-size:11.0pt;font-family:"Times New Roman",serif;color:#242424;mso-ligatures:standardcontextual"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces+peter.hardy=uky.edu@lists.osu.edu>
<b>On Behalf Of </b>Bob Kobistek via Intl_dxmedphys_wd_osu_list<br>
<b>Sent:</b> Friday, July 11, 2025 3:01 PM<br>
<b>To:</b> Steven Shea <steven.michael.shea@gmail.com>; intl_dxmedphys_wd_osu_list@lists.osu.edu<br>
<b>Subject:</b> Re: [Intl_DxMedPhys] Tests post gradient coil replacement for MRI<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#9C6500;border:solid #9C6500 1.0pt;padding:2.0pt;background:#FFEB9C">CAUTION:</span></b><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black;border:solid #9C6500 1.0pt;padding:2.0pt;background:#FFEB9C">
External Sender</span></b><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">With the Siemens service tool, you can also run an eddy current compensation test. Robert J. Kobistek, MS, FACR, DABR, MRSE(MRSC™) Medical Physicist RJK Medical
Physics, Inc. 440-463-7879 From: Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces@</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">lists.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">osu.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">edu><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">With the Siemens service tool, you can also run an eddy current compensation test.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#A50021">Robert J. Kobistek, MS, FACR, DABR, MRSE(MRSC™)</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#A50021">Medical Physicist</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:22.0pt;font-family:"Castellar",serif;color:#A50021">RJK</span><span style="font-size:22.0pt;font-family:"Colonna MT";color:#A50021">
</span><span style="font-size:14.0pt;color:#A50021">Medical Physics, Inc.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:14.0pt;color:#A50021">440-463-7879</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Intl_dxmedphys_wd_osu_list <<a href="mailto:intl_dxmedphys_wd_osu_list-bounces@lists.osu.edu">intl_dxmedphys_wd_osu_list-bounces@lists.osu.edu</a>>
<b>On Behalf Of </b>Steven Shea via Intl_dxmedphys_wd_osu_list<br>
<b>Sent:</b> Thursday, July 10, 2025 12:52 PM<br>
<b>To:</b> <a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu">intl_dxmedphys_wd_osu_list@lists.osu.edu</a><br>
<b>Subject:</b> [Intl_DxMedPhys] Tests post gradient coil replacement for MRI</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">Dear all, One of our MR systems is having the gradient coil replaced (thankfully under contract) and I will be conducting physics testing after the install & calibration.
I will run the ACR phantom and perform all standard measurements.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">Dear all,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">One of our MR systems is having the gradient coil replaced (thankfully under contract) and I will be conducting physics testing after the install & calibration. I will run the ACR phantom and
perform all standard measurements. I also plan to look through the service tool (Siemens Magnetom Aera, I have a service key) to examine the different gradient calibrations & tests that should be done post install. I may also re-run the Siemens phantom shim
(field map) test to verify field homogeneity since they will have ramped down & then ramped up the system. </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">For the MR experts out there -- would you run anything else? Any other test result to pay special attention to or focus on?</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">Thanks, Steve</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Steven Shea, PhD<o:p></o:p></p>
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<p class="MsoNormal">Associate Professor, MR Scientist<o:p></o:p></p>
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<p class="MsoNormal">Department of Radiology & Medical Imaging. Loyola Medicine<o:p></o:p></p>
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