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Hi Simon,</div>

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<br>

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Thanks! Updating to a newer release of RTK did the trick</div>

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<br>

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Best,</div>

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Ben</div>

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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Simon Rit <simon.rit@creatis.insa-lyon.fr><br>

<b>Sent:</b> Thursday, June 11, 2020 9:20 AM<br>

<b>To:</b> Benjamin W. Maloney <Benjamin.W.Maloney.TH@dartmouth.edu><br>

<b>Cc:</b> rtk-users@public.kitware.com <rtk-users@public.kitware.com><br>

<b>Subject:</b> Re: [Rtk-users] Iterative Reconstruction inputs</font>

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<div>Hi Ben,</div>

<div>This should have been fixed since <a href="https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FSimonRit%2FRTK%2Fcommit%2F2c8ae75f3d23dd6174f4bf707217e5cfc2b7e799&data=02%7C01%7CBenjamin.W.Maloney.TH%40dartmouth.edu%7C21f431af0b8d406cd15808d80e09ff47%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637274783398931102&sdata=2JECjsqwwo92xZGqrb7Lwwf1dEeo4biIMlrNzbr0%2F2Y%3D&reserved=0" originalsrc="https://github.com/SimonRit/RTK/commit/2c8ae75f3d23dd6174f4bf707217e5cfc2b7e799" shash="Nh1qdfPZ+kLxqaa5LLC86iRjx20hXd+O1W4Lk2Zl2WLj4kKzuU7VbkffTYg1eOyy8EepSYXIP9GkcxK4LatfimjEXlD4t38ybRiipRWtsLzuIc191QFnKibpl5YIvBj+INg5kZLvNX6FrpW3eR6UkW5IatQRDRAdWzM8/WeVYic=">

this commit</a>. Maybe you can try to upgrade to RTK master?</div>

<div>Otherwise, check the <a href="https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.openrtk.org%2FDoxygen%2Fclasses.html&data=02%7C01%7CBenjamin.W.Maloney.TH%40dartmouth.edu%7C21f431af0b8d406cd15808d80e09ff47%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637274783398931102&sdata=8dfMtgF4VZwvcPUpVGN7ojdAEzRSms0TiFTgF1fIQ9M%3D&reserved=0" originalsrc="http://www.openrtk.org/Doxygen/classes.html" shash="wmRXaSQjp6nhRPltU50DlCfiCRrS4q8etzvCBUU7TjDR/qWICtlOYttTqdk/dKXtMdUz8gCfhajO8jYSZjuJsRo0rBkJXh7dvCemuCfLn/oELLY07ZVjwT7WFH/5K1nXCRTPn2pmOydTB+HAsZdGL06Kt/0dIjB9JgzD7ou+a1s=">

doxygen documentation</a> or you can check <a href="https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FSimonRit%2FRTK%2Fblob%2Fmaster%2Finclude%2FrtkGgoFunctions.h%23L309-L338&data=02%7C01%7CBenjamin.W.Maloney.TH%40dartmouth.edu%7C21f431af0b8d406cd15808d80e09ff47%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637274783398941096&sdata=BdkgS10Ns27%2FuV4xm1YW50y6oSa%2FrWK6a1EgljHlIWY%3D&reserved=0" originalsrc="https://github.com/SimonRit/RTK/blob/master/include/rtkGgoFunctions.h#L309-L338" shash="upJkD0jRHfSNVBSwijRE+bzKLGV6IbR3e2uU85Fz4qgbCdosuAW1Hf6o+XSMy5uHgnVDbyLXw0kKRUWVnY8JeeBTQou/pJt2Mc87qCLOcrDHBZUQxo6u5MBcB1D3p5Px2ulhoYvQkqIwGs1RGJnaombFTKD+WCoTgObwuq8N6MM=">

here</a> how it's done in the applications.</div>

<div>Simon<br>

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<div dir="ltr" class="x_gmail_attr">On Mon, Jun 8, 2020 at 9:22 PM Benjamin W. Maloney <<a href="mailto:Benjamin.W.Maloney.TH@dartmouth.edu">Benjamin.W.Maloney.TH@dartmouth.edu</a>> wrote:<br>

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<span>Hi all,<br>

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<div>Thanks for the help getting my reconstruction up and running last week<br>

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<div><br>

</div>

<div>I apologize if I missed something obvious</div>

<div>I was hoping to use an iterative technique but I'm having trouble getting it running<br>

</div>

<div>Is it required to set a forward projection filter? <br>

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<div><br>

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<div>The relevant code is:<br>

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<div>using FDKGPUType = rtk::CudaIterativeFDKConeBeamReconstructionFilter;<br>

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<div>FDKGPUType::Pointer feldkamp = FDKGPUType::New();<br>

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<div>feldkamp->SetInput(0, constantImageSource2->GetOutput()); //Reconstruction Volume<br>

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<div>feldkamp->SetInput(1, reader->GetOutput()); //Projection Images<br>

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<div>feldkamp->SetGeometry(geometry);<br>

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<div><br>

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<div>I get an error here:<br>

</div>

<div>Exception thrown: read access violation.<br>

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<div>this->m_ForwardProjectionFilter.m_Pointer was nullptr.<br>

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<div>On line 121 of rtkIterativeFDKConeBeamReconstructionFilter.hxx<br>

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<div><br>

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<div>This looks like it doesn't set a forward projection filter by default. I'm struggling a bit to get the format for setting this correct<br>

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<div>Thanks for the help!<br>

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<span>Ben</span><br>

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