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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</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;">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.<div><img alt="PastedGraphic-1.tiff" src="cid:9C5C90F6-F0D1-4731-B446-4008B1F0729F"></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 8:37 AM, Januseski, Daniel <DJANUSESKI@virtua.org> wrote:</div><br class="Apple-interchange-newline"><div><meta charset="UTF-8"><table width="100%" cellpadding="0" cellspacing="0" border="0" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; letter-spacing: normal; orphans: 2; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-line: none; text-decoration-thickness: auto; text-decoration-style: solid;"><tbody><tr><td height="20" bgcolor="#005FA8" bordercolor="#003E6A" align="center" style="border: 1px solid rgb(0, 62, 106);"><a href="https://urldefense.com/v3/__http://www.zixcorp.com/get-started/__;!!KGKeukY!3pqcTvCphD1EUJfYMoPy3ThpZZKspDPJiMav81rlu-3bXV1khY68wOD_JyEM-xUh2ioI3GlB2M5-xe6Y6gQAzZoGfOpb2u0u_2jb$" target="_blank" style="color: rgb(70, 120, 134); text-decoration: none;"><font face="ARIAL" color="#FFFFFF"><span style="color: rgb(255, 255, 255); font-family: Lato, Arial, sans-serif; line-height: 20px; font-size: 13px; text-shadow: rgb(0, 62, 106) 0px -1px 1px; white-space: nowrap;">This message was sent securely using<span class="Apple-converted-space"> </span></span></font><font face="TIMES" color="#FFFFFF"><span style="font-family: Lato, Arial, sans-serif; color: rgb(255, 255, 255); font-size: 13px; padding: 0px; text-shadow: rgb(0, 62, 106) 0px -1px 1px; white-space: nowrap;">Zix</span><span style="vertical-align: super; font-size: 10px;">®</span></font></a></td></tr></tbody></table><br style="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 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;">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></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;">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></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style=""><o:p> </o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style=""><o:p> </o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><i><span style="font-size: 9pt;">Dan Januseski, MS, DABR<o:p></o:p></span></i></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><i><span style="font-size: 9pt;">Voorhees, NJ<o:p></o:p></span></i></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style=""><o:p> </o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style=""><o:p> </o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style=""><o:p> </o:p></span></div><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>Bob Kobistek via Intl_dxmedphys_wd_osu_list<br><b>Sent:</b><span class="Apple-converted-space"> </span>Wednesday, September 23, 2026 9:32 AM<br><b>To:</b><span class="Apple-converted-space"> </span>Douglas Pfeiffer <<a href="mailto:xraydoug@me.com" style="color: rgb(70, 120, 134); text-decoration: underline;">xraydoug@me.com</a>>; 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>[EXTERNAL] Re: [Intl_DxMedPhys] TJC acquisition monitor requirements<o:p></o:p></span></div></div></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><o:p> </o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif; text-align: center;"><span style="font-family: Tahoma, sans-serif; background: yellow;">**WARNING** This email did<b><span class="Apple-converted-space"> </span>NOT</b><span class="Apple-converted-space"> </span>originate from inside Virtua.</span><span style="font-size: 12pt;"><o:p></o:p></span></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif; text-align: center;"><span style="font-family: Tahoma, sans-serif; background: yellow;">Please<span class="Apple-converted-space"> </span><b>STOP</b><span class="Apple-converted-space"> </span>and<span class="Apple-converted-space"> </span><b>ANALYZE</b><span class="Apple-converted-space"> </span>before opening attachments, clicking on links, or providing any information.</span><o:p></o:p></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;">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></div></div><div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 1pt; color: white;">ZjQcmQRYFpfptBannerStart<o:p></o:p></span></div></div><table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="100%" style="width: 737px;"><tbody><tr><td style="padding: 0in 0in 7.5pt;"><table class="MsoNormalTable" border="1" cellspacing="0" cellpadding="0" width="100%" style="width: 737px; background: rgb(208, 216, 220); border-width: 3pt medium medium; border-style: solid none none; border-color: rgb(144, 164, 174) currentcolor currentcolor; border-image: none; border-radius: 4px;"><tbody><tr><td valign="top" style="border: medium; padding: 0in 6pt 4.5pt;"><table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" align="left"><tbody><tr><td style="padding: 0in 6pt 3pt;"><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif; line-height: 15pt;"><b><span style="font-size: 10.5pt; font-family: Arial, sans-serif;">This Message Is From an External Sender<o:p></o:p></span></b></div></td></tr><tr><td style="padding: 0in 6pt 3pt;"><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif; line-height: 12pt;"><span style="font-size: 9pt; font-family: Arial, sans-serif;">This message came from outside your organization.<o:p></o:p></span></div></td></tr></tbody></table><table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" align="right"><tbody><tr><td style="padding: 0in 0in 3pt;"><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif; line-height: 27pt;"><span style="font-size: 10.5pt;"> <a href="https://us-phishalarm-ewt.proofpoint.com/EWT/v1/A_-8kG5y!DsgIW9oRIIIlTvUzwA4OJuEGPPg3XcsNVtRADuGjS9icmeTz1YRC7U2HwesDmt5HyRT2AuWut8H-8KLcMwhuTft2PlFTBk6CXM4rH7FfW2CCcLS0kEUVViutA6cnVHlR6jQ3fHerWwJHml01Ig$" target="_blank" style="color: rgb(70, 120, 134); text-decoration: underline;"><strong><span style="font-family: Arial, sans-serif; border: 1pt solid rgb(102, 102, 102); padding: 5pt; font-weight: normal; text-decoration: none;"> Report Suspicious </span></strong></a> <o:p></o:p></span></div></td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table><div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 1pt; color: white;">ZjQcmQRYFpfptBannerEnd<o:p></o:p></span></div></div><div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><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<o:p></o:p></span></div></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><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><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 11pt;"> </span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 11pt;"> </span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(165, 0, 33);">Robert J. Kobistek, MS, FACR, DABR, MRSE(MRSC™)</span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(165, 0, 33);">Medical Physicist</span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 22pt; font-family: Castellar, serif; color: rgb(165, 0, 33);">RJK</span><span style="font-size: 22pt; font-family: "Colonna MT"; color: rgb(165, 0, 33);"><span class="Apple-converted-space"> </span></span><span style="font-size: 14pt; color: rgb(165, 0, 33);">Medical Physics, Inc.</span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 14pt; color: rgb(165, 0, 33);">440-463-7879</span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 11pt;"> </span><o:p></o:p></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</span><o:p></o:p></div></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"> <o:p></o:p></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</span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">Good morning!</span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"> </span><o:p></o:p></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:</span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"><span id="cid:image001.png@01DD4B47.83EF6B50"><image001.png></span></span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"> </span><o:p></o:p></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?</span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"> </span><o:p></o:p></div><div id="signature"><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">Best regards,</span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">Doug</span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"> </span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"> </span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"> </span><o:p></o:p></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)</span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">Medical Physicist, Radiation Safety Officer</span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">Boulder Community Health</span><o:p></o:p></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></span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">303.415.7515</span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"> </span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;">+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-</span><o:p></o:p></div><div style="margin: 0in; font-size: 10pt; font-family: Aptos, sans-serif;"><span style="font-size: 12pt;"> </span><o:p></o:p></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. 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