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That's what was recommended to us as well for any measurements. We tested our Alpha last week and had no issues. Kalpana Kalpana M. Kanal, PhD, DABR, FACR, FAAPM, FSABI Director, Diagnostic Physics Section and Resident Education Program Director,</div>
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That's what was recommended to us as well for any measurements. We tested our Alpha last week and had no issues. </div>
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Kalpana </div>
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<span style="font-size:8pt;color:rgb(127, 127, 127)">Kalpana M. Kanal, PhD, DABR, FACR, FAAPM, FSABI</span><span></span></p>
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<span style="font-size:8pt;color:rgb(127, 127, 127)">Director, Diagnostic Physics Section and Resident Education</span></p>
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<span style="font-size:8pt;color:rgb(127, 127, 127)">Program Director, Imaging Physics Residency Program</span><span></span></p>
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<span style="font-size:8pt;color:rgb(127, 127, 127)">Professor, Radiology</span><span></span></p>
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<span style="font-size:8pt;color:rgb(127, 127, 127)">Affiliate Faculty, Harborview Injury Prevention Center (HIPRC)</span><span></span></p>
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<span style="font-size:8pt;color:rgb(127, 127, 127)">Adj. Professor, Oral Medicine</span><span></span></p>
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<span style="font-size:8pt;color:rgb(127, 127, 127)">University of Washington | 1959 ne pacific street | box 357987 | seattle, wa 98195-7987 |</span><span></span></p>
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<span style="font-size:8pt;color:rgb(127, 127, 127)">office location:</span><span style="font-size:8pt;font-family:Arial, sans-serif;color:rgb(127, 127, 127)"> </span><span style="font-size:8pt;color:rgb(127, 127, 127)">222F Portage Bay Bldg</span><span></span></p>
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<span style="font-size:8pt;color:rgb(127, 127, 127)">email: <a href="mailto:kkanal@uw.edu" data-outlook-id="4364baf6-3bbc-4ae3-9013-c7c431303dc4" data-linkindex="0" style="color:rgb(0, 120, 212)"><span style="color:rgb(127, 127, 127)">kkanal@uw.edu</span></a> |
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces+kkanal=uw.edu@lists.osu.edu> on behalf of Shane McCotter via Intl_dxmedphys_wd_osu_list
<intl_dxmedphys_wd_osu_list@lists.osu.edu><br>
<b>Sent:</b> Thursday, July 24, 2025 7:17:34 AM<br>
<b>To:</b> Imendra Ranatunge <ranatunge@gmail.com><br>
<b>Cc:</b> intl_dxmedphys_wd_osu_list@lists.osu.edu <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</font>
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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: 37 AM, Imendra Ranatunge via Intl_dxmedphys_wd_osu_list</div>
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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.
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<div>Shane <br>
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<div dir="ltr">Sent from my iPhone</div>
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<blockquote type="cite">On Jul 24, 2025, at 8:37 AM, Imendra Ranatunge via Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list@lists.osu.edu> wrote:<br>
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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</div>
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<p>Hi All,</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.</p>
<p>I tried placing a CTDI phantom adjacent to the ACR phantom, but it showed no improvement.</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.</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?</p>
<p>Imendra</p>
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