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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">I have been performing a test for years on CT where I measure a known object across the phantom with the on device distance tool and compare it to the real size of the object. For the ACR phantom,
the included 100 mm point objects in section 3 (uniformity) seems optimum for this test. It is testing if the device’s display measuring tool is properly calibrated (footnote: never had a failure!).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Yes, technically this is a software feature and is not purely display-dependent so maybe this is not what they are considering. But considering display geometric accuracy as described by Bob is
as he says dependent on aspect ratio and is not a factor in modern flat panel displays (it was a concern in CRTs due to EMF interference), this is my best guess at what JC wants.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt;color:black">Dan Januseski, MS, DABR<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt;color:black">Voorhees, NJ<o:p></o:p></span></i></p>
<p class="MsoNormal"><span style="color:black"><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>Bob Kobistek via Intl_dxmedphys_wd_osu_list<br>
<b>Sent:</b> Wednesday, September 23, 2026 9:32 AM<br>
<b>To:</b> Douglas Pfeiffer <xraydoug@me.com>; DxMedPhys List <intl_dxmedphys_wd_osu_list@lists.osu.edu><br>
<b>Subject:</b> [EXTERNAL] Re: [Intl_DxMedPhys] TJC acquisition monitor requirements<o:p></o:p></span></p>
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<span style="font-family:"Tahoma",sans-serif;color:black;background:yellow">**WARNING** This email did<b> NOT</b> originate from inside Virtua.
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<span style="font-family:"Tahoma",sans-serif;color:black;background:yellow">Please
<b>STOP</b> and <b>ANALYZE</b> before opening attachments, clicking on links, or providing any information.
</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">I’d forgotten about that. A while back I used to check it by measuring the length of some number of squares on a SMPTE pattern in both vertically and horizontally.
So it was more of an aspect ratio test, but that’s the only thing I could think<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">I’d forgotten about that. A while back I used to check it by measuring the length of some number of squares on a SMPTE pattern in both vertically and horizontally.
So it was more of an aspect ratio test, but that’s the only thing I could think<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-size:11.0pt">I’d forgotten about that. A while back I used to check it by measuring the length of some number of squares on a SMPTE pattern in both vertically and horizontally. So it was more of an aspect ratio test, but
that’s the only thing I could think of that could be called spatial accuracy as it relates only to the monitor.</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;mso-ligatures:standardcontextual"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#A50021;mso-ligatures:standardcontextual">Robert J. Kobistek, MS, FACR, DABR, MRSE(MRSC™)</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#A50021;mso-ligatures:standardcontextual">Medical Physicist</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:22.0pt;font-family:"Castellar",serif;color:#A50021;mso-ligatures:standardcontextual">RJK</span><span style="font-size:22.0pt;font-family:"Colonna MT";color:#A50021;mso-ligatures:standardcontextual">
</span><span style="font-size:14.0pt;color:#A50021;mso-ligatures:standardcontextual">Medical Physics, Inc.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:14.0pt;color:#A50021;mso-ligatures:standardcontextual">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>Douglas Pfeiffer via Intl_dxmedphys_wd_osu_list<br>
<b>Sent:</b> Wednesday, September 23, 2026 8:31 AM<br>
<b>To:</b> DxMedPhys List <<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] TJC acquisition monitor requirements</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">Good morning! I just received a document to prepare us for upcoming TJC inspections. It includes the following: My question is about the last item - spatial accuracy.
I’ve never measured spatial accuracy on an acquisition display, and I don’t</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Good morning!</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">I just received a document to prepare us for upcoming TJC inspections. It includes the following:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><img border="0" width="640" height="116" style="width:6.6666in;height:1.2083in" id="Picture_x0020_1" src="cid:image001.png@01DD4B47.83EF6B50"></span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">My question is about the last item - spatial accuracy. I’ve never measured spatial accuracy on an acquisition display, and I don’t remember anyone ever talking about it. The only time I could imagine it being
an issue at all is during MR- and CT-guided biopsies, but that is accuracy of the system calipers and not a function of the display. What are folks doing with this one?</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<div id="signature">
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Best regards,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Doug</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Douglas Pfeiffer, MS, DABR FACR, FAAPM (he/him)</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Medical Physicist, Radiation Safety Officer</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Boulder Community Health</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><a href="mailto:xraydoug@me.com">xraydoug@me.com</a></span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">303.415.7515</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">The opinions expressed in this message are the product of the gray and white matter loitering in my cranium. I speak for myself and no one else, unless I say otherwise.</span><o:p></o:p></p>
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