From 0bb9b17636223daa5a749c628f7ba2b00538a0fc Mon Sep 17 00:00:00 2001
From: Tang Cheng <45505657+tctco@users.noreply.github.com>
Date: Thu, 1 May 2025 00:24:06 +0800
Subject: [PATCH] Fix: issue #4759 Enable proper DICOM image rendering when
 Rescale parameters are set to null (#5003)

---
 platform/core/src/classes/MetadataProvider.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/platform/core/src/classes/MetadataProvider.ts b/platform/core/src/classes/MetadataProvider.ts
index 7ee88898f..ce55c4f05 100644
--- a/platform/core/src/classes/MetadataProvider.ts
+++ b/platform/core/src/classes/MetadataProvider.ts
@@ -215,7 +215,10 @@ class MetadataProvider {
         break;
       case WADO_IMAGE_LOADER_TAGS.MODALITY_LUT_MODULE:
         const { RescaleIntercept, RescaleSlope } = instance;
-        if (RescaleIntercept === undefined || RescaleSlope === undefined) {
+        // Early return if RescaleIntercept or RescaleSlope are not
+        // present (undefined) or explicitly set to null. We use loose
+        // equality in this case to check for *null* or *undefined*.
+        if (RescaleIntercept == null || RescaleSlope == null) {
           return;
         }