<div dir="ltr"><h1 style="font-size:1.4em;margin:0.5em 0px;line-height:1.25em;color:rgb(0,0,0);font-family:arial,helvetica,clean,sans-serif"><p class="MsoNormal" style="margin:0in 0in 8pt;line-height:15.6933px;font-size:11pt;font-family:Calibri,sans-serif">Hi, </p><p class="MsoNormal" style="margin:0in 0in 8pt;line-height:15.6933px;font-size:11pt;font-family:Calibri,sans-serif">I Use a spiral model for CT  (Fan Beam) imaging; how can I reconstruct the output images with RTK?</p><p class="MsoNormal" style="margin:0in 0in 8pt;line-height:15.6933px;font-size:11pt;font-family:Calibri,sans-serif"><span style="color:rgb(34,34,34);font-family:Arial,Helvetica,sans-serif;font-size:small;font-weight:400">Do I Need Registration and Matching Projection Before iterative Algorithms(conjugate gradient, ...) Run?</span>  <br></p><p class="MsoNormal" style="margin:0in 0in 8pt;line-height:15.6933px;font-size:11pt;font-family:Calibri,sans-serif">Tank you.</p><p class="MsoNormal" style="margin:0in 0in 8pt;line-height:15.6933px;font-size:11pt;font-family:Calibri,sans-serif"><br></p><div><img src="cid:ii_k54vf7rq1" alt="spiral-ct-scanner.png" width="240" height="210"><br></div></h1></div>