<div dir="ltr"><div>Hi,</div><div>Please, as I said before "To start with, I would make sure that everything outside the leg is at about 0 in your original Ankle CT data." I don't know the reason but your Ankle.mha file contains crazy values (Min: 9.43646e+07 Max: 9.44526e+07). If I run</div><div>rtkforwardprojections -g geoemtry.xml -i AnkleDICOM.mha -o test.mha --like Ankle.mha  -f CudaRayCast</div><div><div>rtkfdk -g geometry.xml -o Output.mha -p . -r ^test.mha$ --dimension 512,512,245 --hardware cuda --hann 0.4 --hannY 0.4<br></div>I have a more decent result. Remove or increase hann values to have a better spatial resolution.<br>Cheers,<br>Simon</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Sep 23, 2022 at 9:36 AM Sreejith P P <<a href="mailto:sreejithputhettu@gmail.com">sreejithputhettu@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi Simon,<div><br></div><div>Thank you very much for your quick response.</div><div>As suggested, I have refined the Ankle Dicom data so that everything outside the leg part is at 0. I got a fine projection 'Ankle.mha' after doing that.</div><div>However, I didn't get much effect when I reconstructed it using rtkfdk. I understand that projecting and reconstructing a CT image will necessarily result in a loss of quality due to the multiple interpolations. But I doubt, maybe something I am missing here can make it better. Could you have a look at it, please?</div><div><br></div><div>I used the following command for reconstruction.</div><div><i>rtkfdk -g geometry.xml -o Output.mha -p . -r Ankle.mha --dimension 512,512,245 --hardware cuda --hann 0.4 --hannY 0.4</i><br></div><div><i><br></i></div><div><div class="gmail_chip gmail_drive_chip" style="width:396px;height:18px;max-height:18px;background-color:rgb(245,245,245);padding:5px;font-family:arial;font-weight:bold;font-size:13px;border:1px solid rgb(221,221,221);line-height:1"><a href="https://drive.google.com/file/d/1M5hey85gQhh_gCC1dEvvr_EsXkRAOWm3/view?usp=drive_web" style="display:inline-block;max-width:366px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-decoration-line:none;padding:1px 0px;border:medium none" aria-label="Ankle.mha" target="_blank"><img style="vertical-align: bottom; border: medium none;" src="https://ssl.gstatic.com/docs/doclist/images/icon_10_generic_list.png"> <span dir="ltr" style="vertical-align:bottom;text-decoration:none">Ankle.mha</span></a><img style="opacity: 0.55; float: right; display: none;"></div><div class="gmail_chip gmail_drive_chip" style="width:396px;height:18px;max-height:18px;background-color:rgb(245,245,245);padding:5px;font-family:arial;font-weight:bold;font-size:13px;border:1px solid rgb(221,221,221);line-height:1"><a href="https://drive.google.com/file/d/14qcXeN3IL_qHT3IbiJfMaQrTIPIPu81v/view?usp=drive_web" style="display:inline-block;max-width:366px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-decoration-line:none;padding:1px 0px;border:medium none" aria-label="AnkleDICOM.mha" target="_blank"><img style="vertical-align: bottom; border: medium none;" src="https://ssl.gstatic.com/docs/doclist/images/icon_10_generic_list.png"> <span dir="ltr" style="vertical-align:bottom;text-decoration:none">AnkleDICOM.mha</span></a><img style="opacity: 0.55; float: right; display: none;"></div><div class="gmail_chip gmail_drive_chip" style="width:396px;height:18px;max-height:18px;background-color:rgb(245,245,245);padding:5px;font-family:arial;font-weight:bold;font-size:13px;border:1px solid rgb(221,221,221);line-height:1"><a href="https://drive.google.com/file/d/105dwnd8dqgeE2d0qz9I9FPzH1t5b2gcc/view?usp=drive_web" style="display:inline-block;max-width:366px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-decoration-line:none;padding:1px 0px;border:medium none" aria-label="geoemtry.xml" target="_blank"><img style="vertical-align: bottom; border: medium none;" src="https://ssl.gstatic.com/docs/doclist/images/icon_10_generic_list.png"> <span dir="ltr" style="vertical-align:bottom;text-decoration:none">geoemtry.xml</span></a><img style="opacity: 0.55; float: right; display: none;"></div><div class="gmail_chip gmail_drive_chip" style="width:396px;height:18px;max-height:18px;background-color:rgb(245,245,245);padding:5px;font-family:arial;font-weight:bold;font-size:13px;border:1px solid rgb(221,221,221);line-height:1"><a href="https://drive.google.com/file/d/11COT9G6jzrHALPvUs8N4jnnZt9kuIMd3/view?usp=drive_web" style="display:inline-block;max-width:366px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-decoration-line:none;padding:1px 0px;border:medium none" aria-label="output.mha" target="_blank"><img style="vertical-align: bottom; border: medium none;" src="https://ssl.gstatic.com/docs/doclist/images/icon_10_generic_list.png"> <span dir="ltr" style="vertical-align:bottom;text-decoration:none">output.mha</span></a><img style="opacity: 0.55; float: right; display: none;"></div><i><br></i></div><div>Regards,</div><div>Sreejith</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Sep 20, 2022 at 12:44 PM Simon Rit <<a href="mailto:simon.rit@creatis.insa-lyon.fr" target="_blank">simon.rit@creatis.insa-lyon.fr</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi,</div><div>Your projections in Ankle.mha display a very large value in air. To start with, I would make sure that everything outside the leg is at about 0 in your original Ankle CT data.</div><div>Note that projecting and reconstructing a CT image will necessarily result in a loss of quality due to the multiple interpolations (during projection and backprojection). I would suggest to use fine pixels in the projections (e.g. --spacing .25) which you can bin during reconstruction (--binning 4,4).</div><div>Simon<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Sep 19, 2022 at 6:06 PM Sreejith P P <<a href="mailto:sreejithputhettu@gmail.com" target="_blank">sreejithputhettu@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi,<div><br></div><div>I have created projections from 'Ankle' CT data using RTK (cuda projection filter). It looks good to me. </div><div>After that, I tried rtkfdk application to reconstruct it.</div><div>I used the following command and got the attached output.</div><div><i><br></i></div><div><i>rtkfdk -g geometry.xml -o Output.mha -p . -r Ankle.mha --dimension 512,512,245 --hardware cuda --pad 1.0 --hann 0.4 --hannY 0.4</i><br></div><div><i><br></i></div><div>Am I doing it correctly? If yes, I would like to know what I can do to improve the result.</div><div><br></div><div><div class="gmail_chip gmail_drive_chip" style="width:396px;height:18px;max-height:18px;background-color:rgb(245,245,245);padding:5px;font-family:arial;font-weight:bold;font-size:13px;border:1px solid rgb(221,221,221);line-height:1"><a href="https://drive.google.com/file/d/10ybESn9HoU9_LYDgaLUNYIf2BzTarQij/view?usp=drive_web" style="display:inline-block;max-width:366px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-decoration-line:none;padding:1px 0px;border:medium none" aria-label="Ankle.mha" target="_blank"><img style="vertical-align: bottom; border: medium none;" src="https://ssl.gstatic.com/docs/doclist/images/icon_10_generic_list.png"> <span dir="ltr" style="vertical-align:bottom;text-decoration:none">Ankle.mha</span></a><img style="opacity: 0.55; float: right; display: none;"></div><div class="gmail_chip gmail_drive_chip" style="width:396px;height:18px;max-height:18px;background-color:rgb(245,245,245);padding:5px;font-family:arial;font-weight:bold;font-size:13px;border:1px solid rgb(221,221,221);line-height:1"><a href="https://drive.google.com/file/d/1cTlvPld3iRNiRUW8HmnF29i_j6AmzaPW/view?usp=drive_web" style="display:inline-block;max-width:366px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-decoration-line:none;padding:1px 0px;border:medium none" aria-label="geometry.xml" target="_blank"><img style="vertical-align: bottom; border: medium none;" src="https://ssl.gstatic.com/docs/doclist/images/icon_10_generic_list.png"> <span dir="ltr" style="vertical-align:bottom;text-decoration:none">geometry.xml</span></a><img style="opacity: 0.55; float: right; display: none;"></div><div class="gmail_chip gmail_drive_chip" style="width:396px;height:18px;max-height:18px;background-color:rgb(245,245,245);padding:5px;font-family:arial;font-weight:bold;font-size:13px;border:1px solid rgb(221,221,221);line-height:1"><a href="https://drive.google.com/file/d/1iI9V9TUIAKUMyfe-w6TTzFzS0DzvaGyn/view?usp=drive_web" style="display:inline-block;max-width:366px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-decoration-line:none;padding:1px 0px;border:medium none" aria-label="Output.mha" target="_blank"><img style="vertical-align: bottom; border: medium none;" src="https://ssl.gstatic.com/docs/doclist/images/icon_10_generic_list.png"> <span dir="ltr" style="vertical-align:bottom">Output.mha</span></a><img style="display: none; opacity: 0.55; float: right;"></div><br></div></div>
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