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It is Audi mode. (using a special kernel for passing tests) 😉 Must be a German thing, albeit Canon also has you do this in terms of beam collimation and slice thickness for their specifications (they want you to use a ridiculous collimation</div>
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<p class="MsoNormal"><span style="font-size:11.0pt">It is Audi mode. (using a special kernel for passing tests)
</span><span style="font-size:11.0pt;font-family:"Segoe UI Emoji",sans-serif">😉</span><span style="font-size:11.0pt">
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Must be a German thing, albeit Canon also has you do this in terms of beam collimation and slice thickness for their specifications (they want you to use a ridiculous collimation we would never use on patients
for their noise and LCD measurements)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black;mso-ligatures:standardcontextual">Timothy P. Szczykutowicz, Ph.D., DABR<br>
Professor<br>
Departments of Radiology, Medical Physics and BME<br>
University of Wisconsin Madison<br>
Cell# <a href="tel:(716)%20560-7751" target="_blank">1-716-560-7751</a><br>
Office# 1-608-263-5729<br>
he/him/his</span><span style="font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><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+tszczykutowicz=uwhealth.org@lists.osu.edu>
<b>On Behalf Of </b>Imendra Ranatunge via Intl_dxmedphys_wd_osu_list<br>
<b>Sent:</b> Thursday, July 24, 2025 9:24 AM<br>
<b>To:</b> Kalpana M. Kanal <kkanal@uw.edu><br>
<b>Cc:</b> intl_dxmedphys_wd_osu_list@lists.osu.edu<br>
<b>Subject:</b> Re: [Intl_DxMedPhys] CT Number Deviations on Siemens Force and Alpha – ACR Phantom Failures<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p align="center" style="text-align:center"><span style="font-family:"Calibri",sans-serif;color:red;background:yellow">WARNING: This email appears to have originated outside of the UW Health email system.<br>
DO NOT CLICK on links or attachments unless you recognize the sender and know the content is safe.</span><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">Thank you. Yes, I used QIR as well. On Thu, Jul 24, 2025 at 9:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">21
AM Kalpana M. Kanal <kkanal@</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">uw.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">edu>
wrote: That's what was recommended to us as well for any measurements. We tested our Alpha last week and had no issues. Kalpana Kalpana<o:p></o:p></span></p>
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<p class="MsoNormal">Thank you. Yes, I used QIR as well.<o:p></o:p></p>
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<p class="MsoNormal">On Thu, Jul 24, 2025 at 9:21<span style="font-family:"Arial",sans-serif"> </span>AM Kalpana M. Kanal <<a href="mailto:kkanal@uw.edu" target="_blank">kkanal@uw.edu</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">That's what was recommended to us as well for any measurements. We tested our Alpha last week and had no issues. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Kalpana <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div id="m_-5558971797196174784m_-452077745767953407ms-outlook-mobile-signature">
<p style="margin:0in;background:white"><span style="font-size:8.0pt;font-family:"Calibri",sans-serif;color:#7F7F7F">Kalpana M. Kanal, PhD, DABR, FACR, FAAPM, FSABI</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p style="margin:0in;background:white"><span style="font-size:8.0pt;font-family:"Calibri",sans-serif;color:#7F7F7F">Director, Diagnostic Physics Section and Resident Education</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p style="margin:0in;background:white"><span style="font-size:8.0pt;font-family:"Calibri",sans-serif;color:#7F7F7F">Program Director, Imaging Physics Residency Program</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p style="margin:0in;background:white"><span style="font-size:8.0pt;font-family:"Calibri",sans-serif;color:#7F7F7F">Professor, Radiology</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p style="margin:0in;background:white"><span style="font-size:8.0pt;font-family:"Calibri",sans-serif;color:#7F7F7F">Affiliate Faculty, Harborview Injury Prevention Center (HIPRC)</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p style="margin:0in;background:white"><span style="font-size:8.0pt;font-family:"Calibri",sans-serif;color:#7F7F7F">Adj. Professor, Oral Medicine</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p style="margin:0in;background:white"><span style="font-size:8.0pt;font-family:"Calibri",sans-serif;color:#7F7F7F">University of Washington | 1959 ne pacific street | box 357987 | seattle, wa 98195-7987 |</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p style="margin:0in;background:white"><span style="font-size:8.0pt;font-family:"Calibri",sans-serif;color:#7F7F7F">office location:</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#7F7F7F"> </span><span style="font-size:8.0pt;font-family:"Calibri",sans-serif;color:#7F7F7F">222F
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<p style="margin:0in;background:white"><span style="font-size:8.0pt;font-family:"Calibri",sans-serif;color:#7F7F7F">email: <a href="mailto:kkanal@uw.edu" target="_blank"><span style="color:#7F7F7F">kkanal@uw.edu</span></a> | v: 206-616-9166 | pg: 206-680-6391 |
f: 206-543-8356</span><span style="font-size:11.0pt;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;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces+kkanal=<a href="mailto:uw.edu@lists.osu.edu" target="_blank">uw.edu@lists.osu.edu</a>>
on behalf of Shane McCotter via Intl_dxmedphys_wd_osu_list <<a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu" target="_blank">intl_dxmedphys_wd_osu_list@lists.osu.edu</a>><br>
<b>Sent:</b> Thursday, July 24, 2025 7:17:34 AM<br>
<b>To:</b> Imendra Ranatunge <<a href="mailto:ranatunge@gmail.com" target="_blank">ranatunge@gmail.com</a>><br>
<b>Cc:</b> <a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu" target="_blank">
intl_dxmedphys_wd_osu_list@lists.osu.edu</a> <<a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu" target="_blank">intl_dxmedphys_wd_osu_list@lists.osu.edu</a>><br>
<b>Subject:</b> Re: [Intl_DxMedPhys] CT Number Deviations on Siemens Force and Alpha – ACR Phantom Failures</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">Not sure if this will help, but try using the Quantative recon method (if I remember right). Had this issue with a Siemens before and apps recommended that recon.
Shane Sent from my iPhone On Jul 24, 2025, at 8:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">37 AM, Imendra Ranatunge via Intl_dxmedphys_wd_osu_list<o:p></o:p></span></p>
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<p class="MsoNormal">Not sure if this will help, but try using the Quantative recon method (if I remember right). Had this issue with a Siemens before and apps recommended that recon.
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Shane <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Sent from my iPhone<o:p></o:p></p>
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<br>
<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">On Jul 24, 2025, at 8:37<span style="font-family:"Arial",sans-serif"> </span>AM, Imendra Ranatunge via Intl_dxmedphys_wd_osu_list <<a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu" target="_blank">intl_dxmedphys_wd_osu_list@lists.osu.edu</a>>
wrote:<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">Hi All, I’m encountering an issue with a couple of my Siemens CT scanners—specifically the Force and Alpha models. Several of my CT number measurements using the
ACR phantom are failing for air, water, and bone. Some units fail all three, while<o:p></o:p></span></p>
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<p>Hi All,<o:p></o:p></p>
<p>I’m encountering an issue with a couple of my Siemens CT scanners—specifically the Force and Alpha models. Several of my CT number measurements using the ACR phantom are failing for air, water, and bone. Some units fail all three, while others only one or
two.<o:p></o:p></p>
<p>I tried placing a CTDI phantom adjacent to the ACR phantom, but it showed no improvement.<o:p></o:p></p>
<p>I reported the issue to Siemens. They performed a constancy test and stated that the units were functioning normally. However, my CT number results are still outside acceptable limits. In my experience, service engineers are often reluctant to perform time-consuming
calibrations unless specifically requested.<o:p></o:p></p>
<p>Has anyone experienced this before? If so, do you know which specific calibration or adjustment Siemens needs to perform to correct these CT number inaccuracies?<o:p></o:p></p>
<p>Imendra<o:p></o:p></p>
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