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I guess I have to question how important this is, in the grand scheme. If the internal calipers are correct, does the aspect ratio being off impact anything? Yes, we do the measurement, and that is a reasonable interpretation of this TJC requirement,</div>
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<meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div>I guess I have to question how important this is, in the grand scheme. If the internal calipers are correct, does the aspect ratio being off impact anything? Yes, we do the measurement, and that is a reasonable interpretation of this TJC requirement, but I can’t help but wonder why this one matters much. I’m happy to be educated if I’m missing something!</div><div><br id="lineBreakAtBeginningOfMessage"><div>
<div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div id="signature"><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div><div style="orphans: 2; widows: 2;">Best regards,</div><div style="orphans: 2; widows: 2;">Doug</div><div style="orphans: 2; widows: 2;"><br></div><div style="orphans: 2; widows: 2;"><br></div><div style="orphans: 2; widows: 2;"><br></div><div style="orphans: 2; widows: 2;">Douglas Pfeiffer, MS, DABR FACR, FAAPM (he/him)</div><div style="orphans: 2; widows: 2;">Medical Physicist, Radiation Safety Officer</div><div style="orphans: 2; widows: 2;">Boulder Community Health</div><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px;"><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px;"><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px;"><div style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div>xraydoug@me.com</div><div>303.415.7515</div><div><br class="webkit-block-placeholder"></div><div>+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-</div><div><br class="webkit-block-placeholder"></div><div>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.</div></div></div></span></span></span></div></div></div></div></div>
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<div><br><blockquote type="cite"><div>On Sep 23, 2026, at 7:28 AM, Little, Kevin <Kevin.Little@osumc.edu> wrote:</div><br class="Apple-interchange-newline"><div><meta charset="UTF-8"><div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-line: none; text-decoration-thickness: auto; text-decoration-style: solid;"><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">Hi Doug,<o:p></o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"><o:p> </o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">We use the<span class="Apple-converted-space"> </span><a href="https://urldefense.com/v3/__https://aapm.onlinelibrary.wiley.com/doi/10.1118/1.1861159__;!!KGKeukY!zgTSlfKsb3VeeyrH7YQ5-5_CYxfPGVYxiCUSyDaKeqROvWA64QL0YXKJYqkjwzO39wwZjD-GrSycCHo-Z04Nq087KCunfKAN--2l$" style="color: rgb(70, 120, 134); text-decoration: underline;">TG-18</a><span class="Apple-converted-space"> </span>geometric distortion test. Essentially, we are looking for an incorrect aspect ratio (which we have found, especially for replacement monitors). We use a ruler to measure the same number of squares on the SMPTE or TG-18 QC pattern in both directions. Then we calculate the percent difference, using the smallest measurement as the reference. TG-18 says that operator’s consoles are secondary displays for everything other than contrast response, so the limit is 5%.<o:p></o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"><o:p> </o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">Kevin<o:p></o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"><o:p> </o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"><o:p> </o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><a name="x__MailAutoSig"><b><span style="font-size: 9pt; font-family: Arial, sans-serif; color: rgb(187, 0, 0); background: white;">Kevin J Little, PhD, DABR, DABSNM, CIIP</span></b></a><span></span><span style="font-size: 9pt; font-family: Arial, sans-serif; color: rgb(51, 51, 51);"><br><span style="background: white;">Associate Professor</span><br><span style="background: white;">Imaging Medical Physics Residency Program Director</span><br></span><span style="font-size: 9pt; font-family: Arial, sans-serif; color: rgb(187, 0, 0); background: white;">The Ohio State University Wexner Medical Center</span><span style="font-size: 12pt;"><o:p></o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 9pt; font-family: Arial, sans-serif; color: rgb(51, 51, 51); background: white;">Department of Radiology</span><span style="font-size: 9pt; font-family: Arial, sans-serif; color: rgb(51, 51, 51);"><br><span style="background: white;">395 W 12th Avenue, 4th Fl, Columbus, OH, 43210</span></span><span style="font-size: 12pt;"><o:p></o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 9pt; font-family: Arial, sans-serif; background: white;"><a href="mailto:ImagingPhysics@osumc.edu" style="color: rgb(70, 120, 134); text-decoration: underline;"><span style="color: blue;">ImagingPhysics@osumc.edu</span></a></span><span style="font-size: 12pt;"><o:p></o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 9pt; font-family: Arial, sans-serif; color: rgb(51, 51, 51); background: white;">On-call Physicist:<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Arial, sans-serif; background: white;"><a href="https://webxchange.osumc.edu/webxchange/ViewProfile.aspx?profileid=08701" style="color: rgb(70, 120, 134); text-decoration: underline;"><span style="color: blue;">Internal link</span></a></span><span style="font-size: 9pt; font-family: Arial, sans-serif; color: rgb(51, 51, 51); background: white;"> or call<span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; font-family: Arial, sans-serif; background: white;">614-293-7243,8701#</span><span style="font-size: 12pt;"><o:p></o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"><o:p> </o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"><o:p> </o:p></span></div><div style="border-width: 1pt medium medium; border-style: solid none none; border-color: rgb(225, 225, 225) currentcolor currentcolor; border-image: none; padding: 3pt 0in 0in;"><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><b><span style="font-size: 11pt; font-family: Calibri, sans-serif;">From:</span></b><span style="font-size: 11pt; font-family: Calibri, sans-serif;"><span class="Apple-converted-space"> </span>Intl_dxmedphys_wd_osu_list <<a href="mailto:intl_dxmedphys_wd_osu_list-bounces@lists.osu.edu" style="color: rgb(70, 120, 134); text-decoration: underline;">intl_dxmedphys_wd_osu_list-bounces@lists.osu.edu</a>><span class="Apple-converted-space"> </span><b>On Behalf Of<span class="Apple-converted-space"> </span></b>Douglas Pfeiffer via Intl_dxmedphys_wd_osu_list<br><b>Sent:</b><span class="Apple-converted-space"> </span>Wednesday, September 23, 2026 8:31 AM<br><b>To:</b><span class="Apple-converted-space"> </span>DxMedPhys List <<a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu" style="color: rgb(70, 120, 134); text-decoration: underline;">intl_dxmedphys_wd_osu_list@lists.osu.edu</a>><br><b>Subject:</b><span class="Apple-converted-space"> </span>[Intl_DxMedPhys] TJC acquisition monitor requirements<o:p></o:p></span></div></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><o:p> </o:p></div><div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><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<o:p></o:p></span></div></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">Good morning!<o:p></o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"><o:p> </o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">I just received a document to prepare us for upcoming TJC inspections. It includes the following:<o:p></o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"><span id="cid:image001.png@01DD4B3D.F162B890"><image001.png></span></span><span style="font-size: 12pt;"><o:p></o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"><o:p> </o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">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?<o:p></o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"><o:p> </o:p></span></div><div><div id="signature"><div><div><div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">Best regards,<o:p></o:p></span></div></div><div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">Doug<o:p></o:p></span></div></div><div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"><o:p> </o:p></span></div></div><div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"><o:p> </o:p></span></div></div><div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"><o:p> </o:p></span></div></div><div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">Douglas Pfeiffer, MS, DABR FACR, FAAPM (he/him)<o:p></o:p></span></div></div><div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">Medical Physicist, Radiation Safety Officer<o:p></o:p></span></div></div><div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">Boulder Community Health<o:p></o:p></span></div></div><div><div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"><a href="mailto:xraydoug@me.com" style="color: rgb(70, 120, 134); text-decoration: underline;">xraydoug@me.com</a><o:p></o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">303.415.7515<o:p></o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"><o:p> </o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-<o:p></o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"><o:p> </o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">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></div></div></div></div></div></div></div></div></div></blockquote></div><br></div></body></html>