From 6d0552fb96c59dcf3e39b3306a50004b24128330 Mon Sep 17 00:00:00 2001
From: Woonchan Cho <cronus17@gmail.com>
Date: Wed, 9 Feb 2022 13:20:21 -0600
Subject: [PATCH] fix: Invalid VR of the private creator tag of the "Implicit
 VR Endian" typed DICOM file (#242) (#243)

---
 packages/adapters/src/DicomMessage.js | 2 ++
 packages/adapters/src/Tag.js          | 9 ++++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/packages/adapters/src/DicomMessage.js b/packages/adapters/src/DicomMessage.js
index 79406aa50..1ab38800d 100644
--- a/packages/adapters/src/DicomMessage.js
+++ b/packages/adapters/src/DicomMessage.js
@@ -193,6 +193,8 @@ class DicomMessage {
                     vrType = "OW";
                 } else if (vrType == "xs") {
                     vrType = "US";
+                } else if (tag.isPrivateCreator()) {
+                    vrType = "LO";
                 } else {
                     vrType = "UN";
                 }
diff --git a/packages/adapters/src/Tag.js b/packages/adapters/src/Tag.js
index 3d4993e7a..a03120270 100644
--- a/packages/adapters/src/Tag.js
+++ b/packages/adapters/src/Tag.js
@@ -64,6 +64,12 @@ class Tag {
         return this.is(0x7fe00010);
     }
 
+    isPrivateCreator() {
+        const group = this.group();
+        const element = this.element();
+        return group % 2 === 1 && element < 0x100 && element > 0x00;
+    }
+
     static fromString(str) {
         var group = parseInt(str.substring(0, 4), 16),
             element = parseInt(str.substring(4), 16);
@@ -96,7 +102,8 @@ class Tag {
                 useSyntax == EXPLICIT_LITTLE_ENDIAN
                     ? true
                     : false,
-            isEncapsulated = this.isPixelDataTag() && DicomMessage.isEncapsulated(syntax);
+            isEncapsulated =
+                this.isPixelDataTag() && DicomMessage.isEncapsulated(syntax);
 
         var oldEndian = stream.isLittleEndian;
         stream.setEndian(isLittleEndian);