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Follow-up question. . . If the aspect ratio for the secondary display is off, and the vendor says there is nothing they can do to fix it (and won't replace the display), then what do you do? The JC requirement is to evaluate it, not that it has</div>
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<span style="text-transform: none;">Follow-up question...If the aspect ratio for the secondary display is off, and the vendor says there is nothing they can do to fix it (and won't replace the display), then what do you do? The JC requirement is to evaluate
it, not that it has to be displayed correctly. </span></div>
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<span style="text-transform: none;">I have a vendor who has said "there's nothing to be done" about the aspect ratio issue for years, and there really isn't anything I can do about it. Have other people had success in getting vendors to address this when there
is an issue? </span></div>
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Rebecca.</div>
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<b>From: </b>Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces+rebecca.milman=cuanschutz.edu@lists.osu.edu> on behalf of Bob Kobistek via Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list@lists.osu.edu><br>
<b>Date: </b>Wednesday, September 23, 2026 at 12:47 PM<br>
<b>To: </b>Douglas Pfeiffer <xraydoug@me.com>; Januseski, Daniel <DJANUSESKI@virtua.org><br>
<b>Cc: </b>DxMedPhys List <intl_dxmedphys_wd_osu_list@lists.osu.edu><br>
<b>Subject: </b>Re: [Intl_DxMedPhys] TJC acquisition monitor requirements<br>
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[External Email - Use Caution]</div>
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Agreed. And I read my original message again, and I see that I left out a detail. When I said I measured the distances covered by some number of squares on a SMPTE pattern, I meant I measured them with a ruler – not the electronic caliper.</p>
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<span style="font-size: 11pt;"> </span></p>
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<span style="font-family: Arial, sans-serif; color: rgb(165, 0, 33);">Robert J. Kobistek, MS, FACR, DABR, MRSE(MRSC™)</span></p>
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<span style="font-family: Arial, sans-serif; color: rgb(165, 0, 33);">Medical Physicist</span></p>
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<span style="font-family: Castellar, serif; font-size: 22pt; color: rgb(165, 0, 33);">RJK</span><span style="font-family: "Colonna MT"; font-size: 22pt; color: rgb(165, 0, 33);">
</span><span style="font-size: 14pt; color: rgb(165, 0, 33);">Medical Physics, Inc.</span></p>
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<span style="font-size: 14pt; color: rgb(165, 0, 33);">440-463-7879</span></p>
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<span style="font-family: Calibri, sans-serif; font-size: 11pt;"><b>From:</b> Douglas Pfeiffer <xraydoug@me.com><br>
<b>Sent:</b> Wednesday, September 23, 2026 11:48 AM<br>
<b>To:</b> Januseski, Daniel <DJANUSESKI@virtua.org><br>
<b>Cc:</b> Bob Kobistek <bob@rjkmedphys.com>; DxMedPhys List <intl_dxmedphys_wd_osu_list@lists.osu.edu><br>
<b>Subject:</b> Re: [Intl_DxMedPhys] TJC acquisition monitor requirements</span></p>
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Yeah, that’s what I was calling caliper accuracy, which I believe is independent of the display device. Since this is specifically under the acquisition display, and because there is geometric/distance accuracy under the CT heading, they must be thinking of
something different.</p>
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<img src="cid:image001.png@01DD4B6A.34AF6770" id="Picture_x0020_1" width="495" height="240" style="width: 5.1666in; height: 2.5083in; margin-top: 0px; margin-bottom: 0px;"></p>
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<span style="color: black;">Best regards,</span></p>
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<span style="color: black;">Doug</span></p>
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<span style="color: black;"> </span></p>
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<span style="color: black;"> </span></p>
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<span style="color: black;">Douglas Pfeiffer, MS, DABR FACR, FAAPM (he/him)</span></p>
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<span style="color: black;">Medical Physicist, Radiation Safety Officer</span></p>
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<span style="color: black;">Boulder Community Health</span></p>
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<span style="color: blue;"><a href="mailto:xraydoug@me.com" data-outlook-id="955ad568-d754-4bd9-b35b-8ea08cd4d4e0" style="color: blue; margin-top: 0px; margin-bottom: 0px;"><u>xraydoug@me.com</u></a></span></p>
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<span style="color: black;">303.415.7515</span></p>
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<span style="color: black;">+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-</span></p>
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<span style="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></p>
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On Sep 23, 2026, at 8:37<span style="font-family: Arial, sans-serif;"> </span>AM, Januseski, Daniel <<span style="color: blue;"><a href="mailto:DJANUSESKI@virtua.org" data-outlook-id="1ca8b520-368b-48f1-ab7b-5b031297d208" style="color: blue; margin-top: 0px; margin-bottom: 0px;"><u>DJANUSESKI@virtua.org</u></a></span>>
wrote:</p>
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<span style="font-family: Lato, sans-serif; font-size: 10pt; color: white;"><a href="https://urldefense.com/v3/__http://www.zixcorp.com/get-started/__;!!KGKeukY!3Y4hfaAPJTXjuRkXN28qecX1LweJRuvJS5KlU9JToWKfCnUOqtBIS0IBd9GkgJFPrT9jAjF8B8MUwRFJVjBMISi9Om4IjVD33yMzbA$" target="_blank" originalsrc="https://urldefense.com/v3/__http://www.zixcorp.com/get-started/__;!!KGKeukY!3Y4hfaAPJTXjuRkXN28qecX1LweJRuvJS5KlU9JToWKfCnUOqtBIS0IBd9GkgJFPrT9jAjF8B8MUwRFJVjBMISi9Om4IjVD33yMzbA$" data-outlook-id="28d607af-f403-46da-88ed-68fa79b10ca3" style="color: white; margin-top: 0px; margin-bottom: 0px;"><u>This
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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!).</p>
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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.</p>
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<span style="font-size: 9pt;"><i>Dan Januseski, MS, DABR</i></span></p>
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<span style="font-size: 9pt;"><i>Voorhees, NJ</i></span></p>
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<span style="font-family: Calibri, sans-serif; font-size: 11pt;"><b>From:</b> Intl_dxmedphys_wd_osu_list <</span><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(70, 120, 134);"><a href="mailto:intl_dxmedphys_wd_osu_list-bounces@lists.osu.edu" data-outlook-id="c1a59078-57fe-4f80-af61-64ed02197d74" style="color: rgb(70, 120, 134); margin-top: 0px; margin-bottom: 0px;"><u>intl_dxmedphys_wd_osu_list-bounces@lists.osu.edu</u></a></span><span style="font-family: Calibri, sans-serif; font-size: 11pt;">>
<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 <</span><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(70, 120, 134);"><a href="mailto:xraydoug@me.com" data-outlook-id="c533d249-d093-478e-8ed6-43216dd76802" style="color: rgb(70, 120, 134); margin-top: 0px; margin-bottom: 0px;"><u>xraydoug@me.com</u></a></span><span style="font-family: Calibri, sans-serif; font-size: 11pt;">>;
DxMedPhys List <</span><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(70, 120, 134);"><a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu" data-outlook-id="ddf90dfc-ef1e-4555-8513-1a319688eca5" style="color: rgb(70, 120, 134); margin-top: 0px; margin-bottom: 0px;"><u>intl_dxmedphys_wd_osu_list@lists.osu.edu</u></a></span><span style="font-family: Calibri, sans-serif; font-size: 11pt;">><br>
<b>Subject:</b> [EXTERNAL] Re: [Intl_DxMedPhys] TJC acquisition monitor requirements</span></p>
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<span style="font-size: 1pt; 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</span></p>
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<span style="font-size: 1pt; 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</span></p>
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<span style="font-size: 11pt;">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></p>
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<span style="font-family: Arial, sans-serif; color: rgb(165, 0, 33);">Robert J. Kobistek, MS, FACR, DABR, MRSE(MRSC™)</span></p>
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<span style="font-family: Arial, sans-serif; color: rgb(165, 0, 33);">Medical Physicist</span></p>
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<span style="font-family: Castellar, serif; font-size: 22pt; color: rgb(165, 0, 33);">RJK</span><span style="font-family: "Colonna MT"; font-size: 22pt; color: rgb(165, 0, 33);"> </span><span style="font-size: 14pt; color: rgb(165, 0, 33);">Medical Physics,
Inc.</span></p>
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<span style="font-size: 14pt; color: rgb(165, 0, 33);">440-463-7879</span></p>
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<span style="font-family: Calibri, sans-serif; font-size: 11pt;"><b>From:</b> Intl_dxmedphys_wd_osu_list <</span><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(70, 120, 134);"><a href="mailto:intl_dxmedphys_wd_osu_list-bounces@lists.osu.edu" data-outlook-id="2cc035e7-5499-402f-98cd-6cd2da890b08" style="color: rgb(70, 120, 134); margin-top: 0px; margin-bottom: 0px;"><u>intl_dxmedphys_wd_osu_list-bounces@lists.osu.edu</u></a></span><span style="font-family: Calibri, sans-serif; font-size: 11pt;">>
<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 <</span><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(70, 120, 134);"><a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu" data-outlook-id="3f4aa342-11b4-4a8c-ad6e-84e07d9b4994" style="color: rgb(70, 120, 134); margin-top: 0px; margin-bottom: 0px;"><u>intl_dxmedphys_wd_osu_list@lists.osu.edu</u></a></span><span style="font-family: Calibri, sans-serif; font-size: 11pt;">><br>
<b>Subject:</b> [Intl_DxMedPhys] TJC acquisition monitor requirements</span></p>
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<span style="font-size: 1pt; 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></p>
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Good morning!</p>
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I just received a document to prepare us for upcoming TJC inspections. It includes the following:</p>
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<image001.png></p>
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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?</p>
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Best regards,</p>
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Doug</p>
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Douglas Pfeiffer, MS, DABR FACR, FAAPM (he/him)</p>
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Medical Physicist, Radiation Safety Officer</p>
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Boulder Community Health</p>
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<span style="color: rgb(70, 120, 134);"><a href="mailto:xraydoug@me.com" data-outlook-id="f55f2b27-d6b5-48d2-8909-3b83ffb51be1" style="color: rgb(70, 120, 134); margin-top: 0px; margin-bottom: 0px;"><u>xraydoug@me.com</u></a></span></p>
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303.415.7515</p>
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