Merged in bugfix/RAM-3628_cbct_edge_distance (pull request #386)

RAM-3628 lower clearance of cbct phantom to edge

Approved-by: Randy Taylor

docs/source/changelog.rst

@@ -2,6 +2,16 @@
 Changelog
 =========
 
+v 3.24.0
+--------
+
+CBCT
+^^^^
+
+* Some datasets were failing due to the proximity to the edge of the FOV. While we encourage an FOV that is 1cm+ larger than the
+  phantom to minimize edge artifacts and ensure the entire phantom is captured, we have reduced the required clearance
+  of the phantom to the edge by approximately half.
+
 v 3.23.0
 --------
 

pylinac/ct.py

@@ -2582,7 +2582,7 @@ def get_regions(
         thres = thresmeth(edges)
     bw = edges > thres
     if clear_borders:
-        bw = segmentation.clear_border(bw, buffer_size=int(max(bw.shape) / 50))
+        bw = segmentation.clear_border(bw, buffer_size=min(int(max(bw.shape) / 100), 3))
     if fill_holes:
         bw = ndimage.binary_fill_holes(bw)
     labeled_arr, num_roi = measure.label(bw, return_num=True)

pylinac/version.py

@@ -1 +1 @@
-__version__ = "3.23.0"
+__version__ = "3.24.0"

tests_basic/test_cbct.py

@@ -1581,3 +1581,22 @@ class CatPhan604NegativeSliceOverlap(CatPhan604Mixin, TestCase):
     unif_values = {"Center": 24, "Left": 23, "Right": 22, "Top": 23, "Bottom": 21}
     mtf_values = {50: 0.40}
     lowcon_visible = 6
+
+
+class CatPhan504NearEdge(CatPhan504Mixin, TestCase):
+    file_name = "phantom_edge.zip"
+    expected_roll = 1.4
+    origin_slice = 41
+    hu_values = {
+        "Poly": -41,
+        "Acrylic": 120,
+        "Delrin": 322,
+        "Air": -1010,
+        "Teflon": 905,
+        "PMP": -189,
+        "LDPE": -98,
+    }
+    unif_values = {"Center": 12, "Left": 10, "Right": 9, "Top": 9, "Bottom": 11}
+    mtf_values = {50: 0.33}
+    lowcon_visible = 4
+    slice_thickness = 3