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Hi list, 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? I’m referencing the alternative method as suggested by the ACR CT QC</div>
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<p class="MsoNormal"><span style="font-size:11.0pt">Hi list,<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">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"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">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!3KbO6gInQC3SR7tG9SEKK3iZXBiuu923FIglEsIqZhheg0E4CNfDAvmUPFcfa0EZrqhrGaSxCsmvRxndI7EXmrBEzhLY1BVtjgPGB6gfjbtB$">https://accreditationsupport.acr.org/support/solutions/articles/11000056188-quality-control-ct</a>).
The exact instruction are:<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Artifact Evaluation Absent Large Poly Disk<a name="_msoanchor_1"></a><o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Should your facility not have a large poly disk available to perform artifact evaluation on the scan field of view (SFOV) as required, this approach provides a method to qualitatively evaluate the level of
non-uniformities in the SFOV outside of the phantom FOV.<b> </b><o:p></o:p></span></p>
<ol style="margin-top:0in" start="1" type="a">
<li class="MsoNormal" style="mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">Taking care to center the phantom to the SFOV, perform the usual daily QC phantom scan using the smallest T allowed by the maximum NxT <o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">Perform artifact evaluation using <a href="https://urldefense.com/v3/__https://www.acr.org/Clinical-Resources/Clinical-Tools-and-Reference/Specialties/Medical-Physics-Resources__;!!KGKeukY!3KbO6gInQC3SR7tG9SEKK3iZXBiuu923FIglEsIqZhheg0E4CNfDAvmUPFcfa0EZrqhrGaSxCsmvRxndI7EXmrBEzhLY1BVtjgPGBznCHjL2$">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 lfo1"><span style="font-size:11.0pt">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 lfo1"><span style="font-size:11.0pt">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 lfo1"><span style="font-size:11.0pt">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 lfo1"><span style="font-size:11.0pt">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 lfo1"><span style="font-size:11.0pt">Consider a similar level of non-uniformities to be acceptable<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">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 lfo1"><span style="font-size:11.0pt">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"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">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"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">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"><b><span style="font-size:10.0pt;font-family:Muli"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:Muli">Enoch Tung
</span></b><span style="font-size:10.0pt;font-family:Muli">|<b> </b>Medical Physicist (Diagnostic and Health), Radiation Safety Officer, Laser Safety Officer<span style="mso-ligatures:none"><o:p></o:p></span></span></p>
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