<head><!-- BaNnErBlUrFlE-HeAdEr-start -->
<style>
#pfptBannerbtb0sxn { all: revert !important; display: block !important;
visibility: visible !important; opacity: 1 !important;
background-color: #CFD3D7 !important;
max-width: none !important; max-height: none !important }
.pfptPrimaryButtonbtb0sxn:hover, .pfptPrimaryButtonbtb0sxn:focus {
background-color: #adb0b4 !important; }
.pfptPrimaryButtonbtb0sxn:active {
background-color: #8c8e91 !important; }
html:root, html:root>body { all: revert !important; display: block !important;
visibility: visible !important; opacity: 1 !important; }
</style>
<!-- BaNnErBlUrFlE-HeAdEr-end -->
</head><!-- BaNnErBlUrFlE-BoDy-start -->
<!-- Preheader Text : BEGIN -->
<div style="display:none !important;display:none;visibility:hidden;mso-hide:all;font-size:1px;color:#ffffff;line-height:1px;height:0px;max-height:0px;opacity:0;overflow:hidden;">
Dear Peter, That is an interesting artifact. At first glance, it looks like Moire or spike. However, it seems quite unlikely to be Moire due to the pulse sequence being a fast spin echo. GRE or bSSFP are the usual culprits for Moire. Assuming</div>
<!-- Preheader Text : END -->
<!-- Email Banner : BEGIN -->
<div style="display:none !important;display:none;visibility:hidden;mso-hide:all;font-size:1px;color:#ffffff;line-height:1px;max-height:0px;opacity:0;overflow:hidden;">ZjQcmQRYFpfptBannerStart</div>
<!--[if ((ie)|(mso))]>
<table border="0" cellspacing="0" cellpadding="0" width="100%" style="padding: 16px 0px 16px 0px; direction: ltr" lang="en"><tr><td>
<table border="0" cellspacing="0" cellpadding="0" style="padding: 0px 10px 5px 6px; width: 100%; border-radius:4px; border-top:4px solid #8c8e91;background-color:#CFD3D7;"><tr><td valign="top">
<table align="left" border="0" cellspacing="0" cellpadding="0" style="padding: 4px 8px 4px 8px">
<tr><td style="color:#000000; font-family: 'Arial', sans-serif; font-weight:bold; font-size:14px; direction: ltr">
This Message Is From an External Sender
</td></tr>
<tr><td style="color:#000000; font-weight:normal; font-family: 'Arial', sans-serif; font-size:12px; direction: ltr">
This message came from outside your organization.
</td></tr>
</table>
<![if ie]><br clear="all"><![endif]>
<table align="right" border="0" cellspacing="0" cellpadding="0" style="padding: 4px 0px 4px 0px"><tr>
<td style="direction: ltr"> <a target="_blank" href="https://us-phishalarm-ewt.proofpoint.com/EWT/v1/KGKeukY!vYQd06lKSWrqive5f8WPH9vkTRlW06vDom7VDStLfWWqkFPeEZHdpsKK2_4a4GuA0DuRaG8AAJBMdRAUhmQa_EYFWWEDh9g9U2V2omFJ8UkbGZqQEdXkcOJb6NuM67v5_b3_EIIOQUYOEvjYXQ$" style="mso-padding-alt: 7.5px; padding: 7.5px; border-radius: 2px; border: 1.5px solid #666666; "><strong style="font-weight: normal; color: #000000; text-decoration: none; font-family: 'Arial', sans-serif; font-size:14px; line-height: 40px; "> Report Suspicious </strong></a> </td>
</tr></table>
</td></tr></table>
</td></tr></table>
<![endif]-->
<![if !((ie)|(mso))]>
<div dir="ltr" lang="en" id="pfptBannerbtb0sxn" style="all: revert !important; display:block !important; text-align: left !important; margin:16px 0px 16px 0px !important; padding:8px 16px 8px 16px !important; border-radius: 4px !important; min-width: 200px !important; background-color: #CFD3D7 !important; background-color: #CFD3D7; border-top: 4px solid #8c8e91 !important; border-top: 4px solid #8c8e91;">
<div id="pfptBannerbtb0sxn" style="all: unset !important; float:left !important; display:block !important; margin: 0px 0px 1px 0px !important; max-width: 600px !important;">
<div id="pfptBannerbtb0sxn" style="all: unset !important; display:block !important; visibility: visible !important; background-color: #CFD3D7 !important; color:#000000 !important; color:#000000; font-family: 'Arial', sans-serif !important; font-family: 'Arial', sans-serif; font-weight:bold !important; font-weight:bold; font-size:14px !important; line-height:18px !important; line-height:18px">
This Message Is From an External Sender
</div>
<div id="pfptBannerbtb0sxn" style="all: unset !important; display:block !important; visibility: visible !important; background-color: #CFD3D7 !important; color:#000000 !important; color:#000000; font-weight:normal; font-family: 'Arial', sans-serif !important; font-family: 'Arial', sans-serif; font-size:12px !important; line-height:18px !important; line-height:18px; margin-top:2px !important;">
This message came from outside your organization.
</div>
</div>
<div id="pfptBannerbtb0sxn" style="all: unset !important; float: right !important; display: block !important; display: block; margin: 0px 0px 0px 16px !important; text-align: right !important; width: fit-content !important;">
<a id="pfptBannerbtb0sxn" href="https://us-phishalarm-ewt.proofpoint.com/EWT/v1/KGKeukY!vYQd06lKSWrqive5f8WPH9vkTRlW06vDom7VDStLfWWqkFPeEZHdpsKK2_4a4GuA0DuRaG8AAJBMdRAUhmQa_EYFWWEDh9g9U2V2omFJ8UkbGZqQEdXkcOJb6NuM67v5_b3_EIIOQUYOEvjYXQ$"
style="all: unset !important; display: inline-block !important; text-decoration: none">
<div class="pfptPrimaryButtonbtb0sxn" style="display: inline-block !important; display: inline-block; visibility: visible !important; opacity: 1 !important; color: #000000 !important; color: #000000; font-family: 'Arial', sans-serif !important; font-family: 'Arial', sans-serif; font-size: 14px !important; font-weight: normal !important; text-decoration: none !important; border-radius: 2px !important; padding: 7.5px 16px !important; margin: 3px 0 3px 16px !important; white-space: nowrap !important; width: fit-content !important;
border: 1px solid #666666">
Report Suspicious
</div>
</a>
</div>
<div style="clear: both !important; display: block !important; visibility: hidden !important; line-height: 0 !important; font-size: 0.01px !important; height: 0px"> </div>
</div>
<![endif]>
<div style="display:none !important;display:none;visibility:hidden;mso-hide:all;font-size:1px;color:#ffffff;line-height:1px;max-height:0px;opacity:0;overflow:hidden;">ZjQcmQRYFpfptBannerEnd</div>
<!-- Email Banner : END -->
<!-- BaNnErBlUrFlE-BoDy-end -->
<div dir="ltr"><div><div class="gmail_default" style="font-family:tahoma,sans-serif">Dear Peter,</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">That is an interesting artifact. At first glance, it looks like Moire or spike. However, it seems quite unlikely to be Moire due to the pulse sequence being a fast spin echo. GRE or bSSFP are the usual culprits for Moire. Assuming the phase-encode is L/R (to minimize respiratory motion ghosting in main region of interest) and parallel imaging is on, I would agree with you in assuming the likely cause is inadequate oversampling. The other possibility is that a spike is occurring in a specific coil channel that is then propagating irregularly in the image due to the parallel imaging recon. I have seen that happen on a GE system. If the rawdata is still on the system, you could perform a retro-recon and see if you could generate individual images from each channel. (That may not really work if parallel imaging is on.) That might give some clues as to spike or some other coil-related issue. </div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">Good luck if you decide to chase this. I would be curious to learn more on what you find.</div><br clear="all"></div><div><div class="gmail_default" style="font-family:tahoma,sans-serif">Best regards, Steve</div></div><div><br></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr">Steven Shea, PhD<div>Associate Professor, MR Scientist</div><div>Department of Radiology & Medical Imaging. Loyola Medicine</div><div><br></div><div><div class="gmail_default" style="font-family:tahoma,sans-serif"><span style="color:rgb(0,0,0);font-family:arial,sans-serif">From: "Hardy, Peter A." <<a href="mailto:Peter.Hardy@uky.edu">Peter.Hardy@uky.edu</a>></span></div><span style="color:rgb(0,0,0);font-family:arial,sans-serif">To: "<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>></span><br style="color:rgb(0,0,0);font-family:arial,sans-serif"><span style="color:rgb(0,0,0);font-family:arial,sans-serif">Cc: </span><br style="color:rgb(0,0,0);font-family:arial,sans-serif"><span style="color:rgb(0,0,0);font-family:arial,sans-serif">Bcc: </span><br style="color:rgb(0,0,0);font-family:arial,sans-serif"><span style="color:rgb(0,0,0);font-family:arial,sans-serif">Date: Wed, 20 Aug 2025 14:02:07 +0000</span><br style="color:rgb(0,0,0);font-family:arial,sans-serif"><span style="color:rgb(0,0,0);font-family:arial,sans-serif">Subject: <span class="gmail_default" style="font-family:tahoma,sans-serif"></span>[Intl_DxMedPhys] MRI artefact</span><br style="color:rgb(0,0,0);font-family:arial,sans-serif"><div lang="EN-US" style="font-family:arial,sans-serif;color:rgb(0,0,0)"><div class="m_3319002702669565685WordSection1"><p class="MsoNormal"><img width="610" height="481" id="m_3319002702669565685Picture_x0020_1" src="cid:image001.png@01DC11B8.A6466C40" style="border: 0px; width: 6.3541in; height: 5.0104in;"><u></u><u></u></p><p class="MsoNormal">Colleagues:<u></u><u></u></p><p class="MsoNormal">We saw this artifact on several slices of a T1weighted scan (tse2d1_3) obtained on a 3T Siemens Skyra. I suspect the subject’s arms and hands are by their side and as the FOV is pretty small, 320 mm, they may be outside the FOV even with oversampling. Any other thoughts to explain the wavey lines?<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><b><i><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(31,73,125);border:1pt none windowtext;padding:0in">Peter Hardy, PhD, DABMP</span></i></b><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(31,73,125)"><u></u><u></u></span></p><p class="MsoNormal" style="background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial"><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(31,73,125);border:1pt none windowtext;padding:0in">Associate Professor of Radiology, Neuroscience and Biomedical Engineering</span><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(36,36,36)"><u></u><u></u></span></p><p class="MsoNormal" style="background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial"><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(31,73,125);border:1pt none windowtext;padding:0in">Faculty, Division of Diagnostic & Nuclear Medical Physics</span><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(36,36,36)"><u></u><u></u></span></p><p class="MsoNormal" style="background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial"><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(31,73,125);border:1pt none windowtext;padding:0in">Department of Radiology</span><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(36,36,36)"><u></u><u></u></span></p><p class="MsoNormal" style="background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial"><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(31,73,125);border:1pt none windowtext;padding:0in">University of Kentucky College of Medicine</span><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(36,36,36)"><u></u><u></u></span></p><p class="MsoNormal" style="background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial"><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(31,73,125);border:1pt none windowtext;padding:0in">UK HealthCare<u></u><u></u></span></p><p class="MsoNormal" style="background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;vertical-align:baseline"><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(31,73,125);border:1pt none windowtext;padding:0in">800 Rose Street, Room HX-307</span><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(31,73,125)"><u></u><u></u></span></p><p class="MsoNormal" style="background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;vertical-align:baseline"><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(31,73,125);border:1pt none windowtext;padding:0in">Lexington, KY 40536-0293</span><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(31,73,125)"><u></u><u></u></span></p><p class="MsoNormal" style="background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;vertical-align:baseline"><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(31,73,125);border:1pt none windowtext;padding:0in">Phone: (859) 323-2954</span><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(31,73,125)"><u></u><u></u></span></p><p class="MsoNormal" style="background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial"><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(31,73,125)">Email: <a href="mailto:peter.hardy@uky.edu" target="_blank" style="font-family:arial,sans-serif;text-decoration-line:none">peter.hardy@uky.edu</a></span><span style="font-size:11pt;font-family:"Times New Roman",serif;color:rgb(36,36,36)"><u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11pt"><u></u> </span></p></div></div><br></div></div></div></div></div>