<div dir="ltr"><div class="gmail_default" style="font-family:'trebuchet ms',sans-serif"><font color="#0000ff">Hi Simon,</font></div><div class="gmail_default" style="font-family:'trebuchet ms',sans-serif"><font color="#0000ff">Thanks for your reply.</font></div><div class="gmail_default" style="font-family:'trebuchet ms',sans-serif"><font color="#0000ff">would you pls help and explain why backprojection is expected to take shorter time than forward projection?? because i was thinking if no caching step, the backprojection should take much longer time than sart algorithm.</font></div><div class="gmail_default" style="font-family:'trebuchet ms',sans-serif"><font color="#0000ff">yes, i run rtksart for 2 times <a href="http://once.it">once.it</a> took 12xxs, similar to the time consumed of 3 times's sart, which much slower than my own application.</font></div><div class="gmail_default" style="font-family:'trebuchet ms',sans-serif"><font color="#0000ff">BTW, D drive is local disk drive, and 360pro_SL_Vol128_512.mha are 360 shapp-logan projections(512*512 resolution each)</font></div><div class="gmail_default"><div class="gmail_default"><font color="#0000ff" face="trebuchet ms, sans-serif">rtksart -p . -r 360pro_SL_Vol128_512.mha -g geometry.xml -o ../Result_SL512/SART_SL3.mha -f Joseph -b VoxelBasedBackProjection --newspacing 0.5 --dimension 128,128,128 --spacing 1,1,1 --origin -64,-64,-64 -l 0.5 -n 3 --time 1</font></div><div class="gmail_default"><font color="#0000ff" face="trebuchet ms, sans-serif"><br></font></div><div class="gmail_default"><font color="#0000ff"><font face="trebuchet ms, sans-serif">and i will try </font><span style="font-size:14px">reader->Update() like what you said.</span></font></div><div class="gmail_default"><span style="font-size:14px"><font color="#0000ff">Thanks</font></span></div><div class="gmail_default"><span style="font-size:14px"><font color="#0000ff">Guangming</font></span></div><div class="gmail_default" style="color:rgb(0,0,255);font-family:'trebuchet ms',sans-serif"><br></div></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;color:#0000ff"><br></div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><font style="line-height:23.32400131225586px" face="arial, helvetica, sans-serif" color="#674ea7"><b><i>Guangming Zang (Alex)</i></b></font><div style="line-height:23.32400131225586px"><font face="arial, helvetica, sans-serif"><b><i><font color="#0b5394">King Abdullah University of Science and Technology</font><font color="#073763">(KAUST)</font></i></b></font></div><div style="line-height:23.32400131225586px"><span style="font-family:arial;font-size:13px;line-height:20.020000457763672px"><font color="#0b5394"><b><i>University of Chinese Academy of Sciences(UCAS)</i></b></font></span><font face="arial, helvetica, sans-serif"><b><i><font color="#073763"><br></font></i></b></font></div><div style="line-height:23.32400131225586px"><span style="font-family:arial;font-size:13px;line-height:20.020000457763672px"><font color="#0b5394"><b><i><br></i></b></font></span></div><div style="line-height:23.32400131225586px"><span style="font-family:arial;font-size:13px;line-height:20.020000457763672px"><font color="#0b5394"><b><i><br></i></b></font></span></div><div style="line-height:23.32400131225586px"><br></div></div></div></div></div></div>
<br><div class="gmail_quote">2015-07-27 8:59 GMT+03:00 Simon Rit <span dir="ltr"><<a href="mailto:simon.rit@creatis.insa-lyon.fr" target="_blank">simon.rit@creatis.insa-lyon.fr</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div>Hi Guangming,<br></div>It's not surprising to me that the backprojection is faster than the forward projection, that's what I expect. If the total time is longer, that's probably that some individual steps are not included in the total time. Can you try to add<br></div>reader->Update();<br></div>before the line<br>
<pre style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"><span style="color:#800080">itk</span><span style="color:#000000">::</span><span style="color:#800080">TimeProbe</span><span style="color:#c0c0c0"> </span><span style="color:#000000">totalTimeProbe</span><span style="color:#000000">;<br></span></pre><pre style="margin:0px;text-indent:0px"><span style="color:#000000">in rtksart.cxx? It may be that all the reading operations are done but not timed in the sart->Update(). Why they are so long, I don't know, is your D: drive a network drive? Do you observe the same behavior if you do rtksart 2 times in a row?<br></span></pre><pre style="margin:0px;text-indent:0px"><span style="color:#000000">Simon<br></span></pre><br><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On Mon, Jul 27, 2015 at 12:30 AM, Guangming Zang <span dir="ltr"><<a href="mailto:guangming.zang@kaust.edu.sa" target="_blank">guangming.zang@kaust.edu.sa</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr"><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;color:#0000ff">Hi RTK community,</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;color:#0000ff">i am using SART algorithm to reconstruct an object.</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;color:#0000ff">But in this new RTK version, the time recording seems a little weird:</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;color:#0000ff"> the total time is 1219.12s , but adding the time cost in different stages is not 1291.12 s. especially for "backprojection" part, only 16.6051s to reconstruct a 128^3 volume ?? even shorter than forward projection part. BTW, the -f and -b are Joseph and VoxelBasedBackProjection, respectively, both multi-threading i think.</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;color:#0000ff">Can anyone tell me what's going on?</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;color:#0000ff">Thanks </div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;color:#0000ff">Regards</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;color:#0000ff">Guangming</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;color:#0000ff"><br></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;color:#0000ff"><img src="cid:ii_14ecc75e51027997" alt="内嵌图片 1" style="margin-right:0px" height="155" width="398"><br></div><div><div><div dir="ltr"><div><div dir="ltr"><font style="line-height:23.32400131225586px" face="arial, helvetica, sans-serif" color="#674ea7"><b><i>Guangming Zang (Alex)</i></b></font><div style="line-height:23.32400131225586px"><font face="arial, helvetica, sans-serif"><b><i><font color="#0b5394">King Abdullah University of Science and Technology</font><font color="#073763">(KAUST)</font></i></b></font></div><div style="line-height:23.32400131225586px"><span style="font-family:arial;font-size:13px;line-height:20.020000457763672px"><font color="#0b5394"><b><i>University of Chinese Academy of Sciences(UCAS)</i></b></font></span><font face="arial, helvetica, sans-serif"><b><i><font color="#073763"><br></font></i></b></font></div><div style="line-height:23.32400131225586px"><span style="font-family:arial;font-size:13px;line-height:20.020000457763672px"><font color="#0b5394"><b><i><br></i></b></font></span></div><div style="line-height:23.32400131225586px"><span style="font-family:arial;font-size:13px;line-height:20.020000457763672px"><font color="#0b5394"><b><i><br></i></b></font></span></div><div style="line-height:23.32400131225586px"><br></div></div></div></div></div></div>
</div>
<br>
</div></div><div><hr></div><font face="Arial" size="1">This message and its contents, including attachments are intended solely for the original recipient. If you are not the intended recipient or have received this message in error, please notify me immediately and delete this message from your computer system. Any unauthorized use or distribution is prohibited. Please consider the environment before printing this email.</font></blockquote></div><br></div></div>
</blockquote></div><br></div>
<br>
<div><hr></div><font face="Arial" size="1">This message and its contents, including attachments are intended solely for the original recipient. If you are not the intended recipient or have received this message in error, please notify me immediately and delete this message from your computer system. Any unauthorized use or distribution is prohibited. Please consider the environment before printing this email.</font>