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Agree that is is likely a growth of bacteria. The best corrective action is to let it decay then take the lid off and inserts out, empty water and wash everything (surfaces and inserts) thoroughly. I’ve had this happen with a SPECT phantom. </div>
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<meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Agree that is is likely a growth of bacteria.  The best corrective action is to let it decay then take the lid off and inserts out, empty water and wash everything (surfaces and inserts) thoroughly.  I’ve had this happen with a SPECT phantom.  Going forward once everything is clean and sanitized, refill the phantom with distilled, not tap, water and add a few drops of bleach.  Even with these preventative measures it’s best to clean it periodically as a proactive measure.  <div><br></div><div><br id="lineBreakAtBeginningOfSignature"><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br><blockquote type="cite">On Jun 10, 2026, at 3:31 PM, David S. Winter via Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list@lists.osu.edu> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><!-- BaNnErBlUrFlE-BoDy-start -->
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Hollywood should take a hint. Enclosed environment filled only with water and the occasional injection of radioactive material. The question is… will the result be hero or villain? D. SCOTT WINTER ​​​​ CHIEF DIAGNOSTIC MEDICAL PHYSICIST O: 228-865-3475</div>
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<p class="MsoNormal">Hollywood should take a hint. Enclosed environment filled only with water and the occasional injection of radioactive material. The question is… will the result be hero or villain?<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:1.0pt"><a href="https://urldefense.com/v3/__https://wearememorial.com/__;!!KGKeukY!w5FAGj1Z1_rp0INjPTEi0vyMcD7KY9mqBnlx3BNv9TmSvyC32pN_Tp6X5GSjayIin6szCx9n4eKJirkqc8BpbzoL0hpD2wyD_HKQ$" target="_blank"><span style="font-size:12.0pt;color:windowtext;text-decoration:none"><!--[if gte vml 1]><v:shapetype id="_x0000_t75" coordsize="21600,21600" o:spt="75" o:preferrelative="t" path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f">
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<p class="MsoNormal"><b><span style="font-family:"Trebuchet MS",sans-serif;color:#00A19C">D. SCOTT WINTER</span></b><b><span style="font-family:"Trebuchet MS",sans-serif;color:#00A19C"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Trebuchet MS",sans-serif;color:#6F767E">CHIEF DIAGNOSTIC MEDICAL PHYSICIST</span></b><b><span style="font-size:10.0pt;font-family:"Trebuchet MS",sans-serif;color:#6F767E"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Trebuchet MS",sans-serif;color:#DBA800">O:</span><span style="font-size:9.0pt;font-family:"Trebuchet MS",sans-serif;color:#DBA800"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Trebuchet MS",sans-serif;color:#6F767E"><a href="tel:228-865-3475" target="_blank"><span style="color:#6F767E;text-decoration:none">228-865-3475</span></a><o:p></o:p></span></p>
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<p class="MsoNormal"><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 <intl_dxmedphys_wd_osu_list-bounces+dwinter=mhg.com@lists.osu.edu>
<b>On Behalf Of </b>Joshua M Wilson via Intl_dxmedphys_wd_osu_list<br>
<b>Sent:</b> Wednesday, June 10, 2026 9:48 AM<br>
<b>To:</b> intl_dxmedphys_wd_osu_list@lists.osu.edu; Kesner, Adam <kesnera@mskcc.org><br>
<b>Subject:</b> Re: [Intl_DxMedPhys] Case report - PET "artifact"<o:p></o:p></span></p>
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<p class="MsoNormal"><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'm guessing the phantom hasn't been emptied in a very long time. This is a classic "some bacteria is growing in the water and will gladly feast of some newly introduced
 glucose.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">" As you probably know, adding a couple drops of bleach<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;color:black">I'm guessing the phantom hasn't been emptied in a very long time. This is a classic "some bacteria is growing in the water and will gladly feast of some newly introduced glucose." As you probably
 know, adding a couple drops of bleach during phantom fills helps to avoid this.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Best,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Josh M. Wilson, PhD<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Duke University Health System</span><o:p></o:p></p>
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<div style="margin-left:30.0pt">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Radiation Physicist, Clinical Imaging Physics Group<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Duke University, School of Medicine</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Director, Duke Imaging Physics Residency Program<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Assistant Professor, Department of Radiology<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Duke University, Graduate School<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Faculty, Medical Physics Graduate Program<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;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Intl_dxmedphys_wd_osu_list <<a href="mailto:intl_dxmedphys_wd_osu_list-bounces+joshua.wilson=duke.edu@lists.osu.edu">intl_dxmedphys_wd_osu_list-bounces+joshua.wilson=duke.edu@lists.osu.edu</a>>
 on behalf of Kesner, Adam via Intl_dxmedphys_wd_osu_list <<a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu">intl_dxmedphys_wd_osu_list@lists.osu.edu</a>><br>
<b>Sent:</b> Wednesday, June 10, 2026 9:15 AM<br>
<b>To:</b> <a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu">intl_dxmedphys_wd_osu_list@lists.osu.edu</a> <<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] Case report - PET "artifact"</span> <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<div>
<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">Here was a new one for me – last night we scanned an ACR PET phantom, three acquisitions on two different PET scanners. Interestingly we found what appears to be
 a unexpected clump of activity, at new location each acquisition. See pics.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white"><o:p></o:p></span></p>
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<p class="xmsonormal"><span style="font-size:11.0pt">Here was a new one for me – last night we scanned an ACR PET phantom, three acquisitions on two different PET scanners.  Interestingly we found what appears to be a unexpected clump of activity, at new location
 each acquisition. See pics. </span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt">We used water + FDG. Our group has a theory what we saw, but happy to hear input from the community…</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt;color:black;background:yellow">SCAN 1</span><span style="font-size:11.0pt">
</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"><div><image005.png></div></span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt;color:black;background:lime">SCAN 2</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"><div><image006.png></div></span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt;color:black;background:aqua">SCAN 3</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"><div><image007.png></div></span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="xmsonormal"><b><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:#F26529">Adam Kesner, PhD, DABR</span></b><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt;font-family:"Georgia",serif;color:black">Deputy Service Chief of Molecular and X-Ray Imaging Physics
</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt;font-family:"Georgia",serif;color:black">Attending Physicist</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:11.0pt;font-family:"Georgia",serif;color:black">Department of Medical Physics</span><span style="font-size:5.0pt;font-family:"Georgia",serif;color:black"><br>
</span><b><span style="font-size:11.0pt;font-family:"Georgia",serif;color:black">Memorial Sloan Kettering Cancer Center</span></b><span style="font-size:11.0pt;font-family:"Georgia",serif;color:black"><br>
1250 First Avenue, Room S-1119E (Box 84), New York, NY 10065<br>
T 212-639-6371   F 212-717-3010<br>
</span><span style="font-size:11.0pt"><a href="mailto:kesnera@mskcc.org"><span style="font-family:"Georgia",serif;color:#2986E2">kesnera@mskcc.org</span></a></span><span style="font-size:5.0pt;font-family:"Georgia",serif;color:black"><br>
</span><span style="font-size:11.0pt"><a href="https://urldefense.com/v3/__http:/www.mskcc.org/__;!!PfbeBCCAmug!k_SPbpPd6f0phKqeF-s7r5EDomcywFrSCDxfG8C2R4Q1pA4llCp4hS6ODDJDHMhLD3_ugWzO81kT78dhrGE$"><span style="font-family:"Georgia",serif;color:#2986E2">www.mskcc.org</span></a></span><span style="font-size:11.0pt;font-family:"Georgia",serif;color:black">
</span><o:p></o:p></p>
<p class="xmsonormal"> <o:p></o:p></p>
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