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Hi Enoch, I wish I had saved pictures, but there was a scanner a few months ago that was having some issues. When the engineers arrived, the first thing they did was perform an air scan to check for artifacts. Of course, we saw rings…</div>
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<p class="MsoNormal"><span style="font-size:11.0pt">Hi Enoch,<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">I wish I had saved pictures, but there was a scanner a few months ago that was having some issues. When the engineers arrived, the first thing they did was perform an air scan to check for artifacts. Of course,
we saw rings… <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">IMHO, an air scan is just as valid for detecting artifacts. The only drawback is that you need to manually adjust the window and level to see the artifacts, but it still provides a lot of useful information.
<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">Thank you,<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;mso-ligatures:standardcontextual">Lei Ding, MS, DABR, DABMP, DABSNM, MRSE</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Medical Physicist<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">University of Miami Miller School of Medicine<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">1600 N.W. 10<sup>th</sup> Avenue, RMSB 1081A<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Miami, FL 33136<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black;mso-ligatures:standardcontextual">Direct: <a href="tel:%28305%29%20243-5816" target="_blank" title="tel:%28305%29%20243-5816
Ctrl+Click or tap to follow the link"><span style="color:black;text-decoration:none">(305)
243-</span></a>6360/ (305) 243-6369</span><span style="font-size:11.0pt;mso-ligatures:standardcontextual"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Cell: 813-743-2373<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"><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@lists.osu.edu>
<b>On Behalf Of </b>Enoch Tung via Intl_dxmedphys_wd_osu_list<br>
<b>Sent:</b> Tuesday, August 19, 2025 12:19 PM<br>
<b>To:</b> intl_dxmedphys_wd_osu_list@lists.osu.edu<br>
<b>Subject:</b> [EXTERNAL] Re: [Intl_DxMedPhys] CT Artifact Evaluation Absent Large Poly Disk - air scan<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" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">Hi list, Re-circulating this to see if anyone has examples of non-uniformities visible through air scans performed. I don’t know if the lack of response was due
to this being an uncommonly performed approach, visible artifact manifests<o:p></o:p></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><strong><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#91040B">CAUTION:</span></strong><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#91040B">
</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">This email originated from outside the organization.
<strong><span style="font-family:"Arial",sans-serif">DO NOT CLICK ON LINKS</span></strong>
<u>or</u> <strong><span style="font-family:"Arial",sans-serif">OPEN ATTACHMENTS</span></strong> unless you know and trust the sender.</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;mso-ligatures:standardcontextual">Hi list,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;mso-ligatures:standardcontextual">Re-circulating this to see if anyone has examples of non-uniformities visible through air scans performed.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;mso-ligatures:standardcontextual">I don’t know if the lack of response was due to this being an uncommonly performed approach, visible artifact manifests rarely, or me choosing the wrong time to ask the question
just before the AAPM annual meeting.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;mso-ligatures:standardcontextual">I appreciate any insight or help anyone may have.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;mso-ligatures:standardcontextual">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;mso-ligatures:standardcontextual">Enoch<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;mso-ligatures:standardcontextual"><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"> Enoch Tung
<br>
<b>Sent:</b> Friday, July 25, 2025 12:49 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> CT Artifact Evaluation Absent Large Poly Disk - air scan<o:p></o:p></span></p>
</div>
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<p class="MsoNormal"><span style="font-size:12.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Hi list,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Does anyone have examples of artifacts that can be observed in performing air scans for the comprehensive SFOV in the absence of a large uniformity phantom?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">I’m referencing the alternative method as suggested by the ACR CT QC Manual (<a href="https://urldefense.com/v3/__https:/accreditationsupport.acr.org/support/solutions/articles/11000056188-quality-control-ct__;!!KGKeukY!1_cZvcWoFXPo6GIt5QbdTx3q5w7z1viB6JqJitALJLFU0p1VxDrNOh7TkddRDIK5omcY84u7R2grKKZsQRMt7g5JDMLeg0utirfBKQH1W52m$">https://accreditationsupport.acr.org/support/solutions/articles/11000056188-quality-control-ct</a>).
The exact instruction are:<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Artifact Evaluation Absent Large Poly Disk<a name="_msoanchor_1"></a><o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Should your facility not have a large poly disk available to perform artifact evaluation on the scan field of view (SFOV) as required, this approach provides a method to qualitatively
evaluate the level of non-uniformities in the SFOV outside of the phantom FOV.<b> </b><o:p></o:p></span></p>
<ol style="margin-top:0in" start="1" type="a">
<li class="MsoNormal" style="mso-list:l0 level1 lfo3"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Taking care to center the phantom to the SFOV, perform the usual daily QC phantom scan using the smallest T allowed by the maximum NxT <o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l0 level1 lfo3"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Perform artifact evaluation using <a href="https://urldefense.com/v3/__https:/www.acr.org/Clinical-Resources/Clinical-Tools-and-Reference/Specialties/Medical-Physics-Resources__;!!KGKeukY!1_cZvcWoFXPo6GIt5QbdTx3q5w7z1viB6JqJitALJLFU0p1VxDrNOh7TkddRDIK5omcY84u7R2grKKZsQRMt7g5JDMLeg0utirfBKWAMvXQ2$">ACR
CT QC manual</a> method to determine if there are potentially clinically significant artifacts over the phantom FOV (if artifacts are seen, use clinical image significance evaluation method below)<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l0 level1 lfo3"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">After verifying the absence of such artifacts over the phantom FOV, at least monthly perform an air scan using a modified version of the daily
QC protocol that uses the largest clinical SFOV available<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l0 level1 lfo3"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">To evaluate the L SFOV images for potentially clinically significant artifacts outside of the phantom FOV, set a window width of approximately
100 HU and a window level of approximately -1000 HU<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l0 level1 lfo3"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Draw a 20 cm diameter ROI in the center of the image<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l0 level1 lfo3"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Review all images qualitatively comparing the level of visualized non-uniformities outside the ROI to that inside the ROI<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l0 level1 lfo3"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Consider a similar level of non-uniformities to be acceptable<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l0 level1 lfo3"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">If there is an increased level of non-uniformities seen outside the ROI, review clinical scans to determine if artifacts are clinically significant<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l0 level1 lfo3"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Clinical scans reviewed should be of the large scan field of view using all typical reconstruction window and level settings<o:p></o:p></span></li></ol>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">I’m interested how non-uniformities will show as neither myself nor our technologist have been able to observe such.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual">Enoch<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:Muli;mso-ligatures:standardcontextual"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-family:Muli;mso-ligatures:standardcontextual">Enoch Tung
</span></b><span style="font-family:Muli;mso-ligatures:standardcontextual">|<b> </b>
Medical Physicist (Diagnostic and Health), Radiation Safety Officer, Laser Safety Officer</span><span style="font-family:Muli"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:Muli;color:#0069B1;mso-ligatures:standardcontextual">Imaging Services</span></b><b><span style="font-family:Muli;mso-ligatures:standardcontextual">
</span></b><span style="font-family:Muli;mso-ligatures:standardcontextual">| <b><span style="color:#0069B1">MultiCare</span></b><o:p></o:p></span></p>
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<b>Cell</b>: 617.543.5488 | <b>Fax: </b>253.301.5010 | <b>Email: </b><a href="mailto:etung@multicare.org"><span style="color:blue">enoch.tung@multicare.org</span></a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:Muli;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
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