# HG changeset patch
# User Alain Mazy <am@orthanc.team>
# Date 1762169993 -3600
# Node ID 8d0285378ed79644d9ac079595dba6b4749c9c95
# Parent  266b0b912c356e660c7c0ec31d2a0b6dbc202383
Use 'ImagerPixelSpacing' (0018,1164) tag if 'PixelSpacing' is missing

diff -r 266b0b912c35 -r 8d0285378ed7 Applications/StoneWebViewer/NEWS
--- a/Applications/StoneWebViewer/NEWS	Wed Jul 09 12:55:20 2025 +0200
+++ b/Applications/StoneWebViewer/NEWS	Mon Nov 03 12:39:53 2025 +0100
@@ -12,12 +12,14 @@
 * New configuration options "AnnotationsColor" and "HighlightedAnnotationsColor"
   to change the color of annotations
 
+
 Maintenance
 -----------
 
 * Automatically stretch to whole range for images without windowing preset
 * Improved support of the (0028,9132) tag for Philips multiframe images
 * Fix loading of US images with a negative PhyiscalDeltaX value
+* Use "ImagerPixelSpacing" (0018,1164) tag if "PixelSpacing" is missing
 
 
 Version 2.6 (2024-08-31)
diff -r 266b0b912c35 -r 8d0285378ed7 OrthancStone/Sources/Toolbox/GeometryToolbox.cpp
--- a/OrthancStone/Sources/Toolbox/GeometryToolbox.cpp	Wed Jul 09 12:55:20 2025 +0200
+++ b/OrthancStone/Sources/Toolbox/GeometryToolbox.cpp	Mon Nov 03 12:39:53 2025 +0100
@@ -310,7 +310,6 @@
                          const Orthanc::DicomMap& dicom)
     {
       Vector v;
-
       if (LinearAlgebra::ParseVector(v, dicom, Orthanc::DICOM_TAG_PIXEL_SPACING) &&
           v.size() >= 2 &&
           v[0] > 0 &&
@@ -321,6 +320,16 @@
         spacingY = v[0];
         return true;
       }
+      else if (LinearAlgebra::ParseVector(v, dicom, Orthanc::DICOM_TAG_IMAGER_PIXEL_SPACING) &&
+          v.size() >= 2 &&
+          v[0] > 0 &&
+          v[1] > 0)
+      {
+        // WARNING: X/Y are swapped (Y comes first)
+        spacingX = v[1];
+        spacingY = v[0];
+        return true;
+      }
       else
       {
         // The "PixelSpacing" is of type 1C: It could be absent, use
diff -r 266b0b912c35 -r 8d0285378ed7 TODO
--- a/TODO	Wed Jul 09 12:55:20 2025 +0200
+++ b/TODO	Mon Nov 03 12:39:53 2025 +0100
@@ -24,8 +24,6 @@
 
 * Display GSPS layers (Grayscale Softcopy Presentation State).
 
-* Use "ImagerPixelSpacing" (0018,1164) tag if "PixelSpacing" is missing
-
 * Override which tags are displayed in the image information in the
   top-left, top-right and bottom-right pannels.