X-Git-Url: http://git.kpe.io/?p=ctsim.git;a=blobdiff_plain;f=libctsim%2Fbackprojectors.cpp;h=726e5b8d30189c14e472f5e4eee802930742964e;hp=4e82edd0c03858be6b3eb564e0edbfd403bec27e;hb=7ec2cd66921180a624813dff9f8bac76c6b268cc;hpb=dc034c9d0b7d9c3874a324a4c2c189a02945adc8

diff --git a/libctsim/backprojectors.cpp b/libctsim/backprojectors.cpp
index 4e82edd..726e5b8 100644
--- a/libctsim/backprojectors.cpp
+++ b/libctsim/backprojectors.cpp
@@ -8,7 +8,7 @@
 **  This is part of the CTSim program
 **  Copyright (C) 1983-2000 Kevin Rosenberg
 **
-**  $Id: backprojectors.cpp,v 1.19 2000/12/16 06:12:47 kevin Exp $
+**  $Id: backprojectors.cpp,v 1.21 2001/01/01 10:14:34 kevin Exp $
 **
 **  This program is free software; you can redistribute it and/or modify
 **  it under the terms of the GNU General Public License (version 2) as
@@ -84,7 +84,7 @@ const char* Backprojector::s_aszInterpTitle[] =
 {
   {"Nearest"},
   {"Linear"},
-  {"Frequency Preinterpolationj"},
+  {"Frequency Preinterpolation"},
 #if HAVE_BSPLINE_INTERP
   {"B-Spline"},
   {"B-Spline 1st Order"},
@@ -263,7 +263,13 @@ Backproject::Backproject (const Projections& proj, ImageFile& im, int interpType
   nDet = proj.nDet();
   iDetCenter = (nDet - 1) / 2;	// index refering to L=0 projection 
   rotScale = proj.rotInc();
-  rotScale /= (proj.nView() * proj.rotInc() / PI); // scale by number of PI rotations
+
+  if (proj.geometry() == Scanner::GEOMETRY_PARALLEL)
+	rotScale /= (proj.nView() * proj.rotInc() / PI); // scale by number of PI rotations
+  else if (proj.geometry() == Scanner::GEOMETRY_EQUIANGULAR || proj.geometry() == Scanner::GEOMETRY_EQUILINEAR)
+	rotScale /= (proj.nView() * proj.rotInc() / (2 * PI)); // scale by number of 2PI rotations
+  else
+	  sys_error (ERR_SEVERE, "Invalid geometry type %d [Backproject::Backproject]", proj.geometry());
 
   v = im.getArray();
   nx = im.nx();