From a5796e8e8b1a1870d21c8a94dfe8b51d5fa596d2 Mon Sep 17 00:00:00 2001
From: Carlos Martinez <carlosjmtz@gmail.com>
Date: Thu, 19 Mar 2026 16:24:36 +0000
Subject: [PATCH] Set SpecificCharacterSet in C-FIND response

---
 src/services/dicom/__init__.py    | 3 +++
 src/services/mwl/c_find.py        | 4 +++-
 tests/services/mwl/test_c_find.py | 3 ++-
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/services/dicom/__init__.py b/src/services/dicom/__init__.py
index baa3bfce..98080670 100644
--- a/src/services/dicom/__init__.py
+++ b/src/services/dicom/__init__.py
@@ -1,5 +1,8 @@
 """DICOM services for PACS functionality."""
 
+# DICOM character sets
+CHARSET_UTF8 = "ISO_IR 192"
+
 # DICOM status codes
 SUCCESS = 0x0000
 FAILURE = 0xC000
diff --git a/src/services/mwl/c_find.py b/src/services/mwl/c_find.py
index ef7ce0ed..20c19ed1 100644
--- a/src/services/mwl/c_find.py
+++ b/src/services/mwl/c_find.py
@@ -10,7 +10,7 @@
 from pydicom import Dataset
 from pynetdicom import evt
 
-from services.dicom import FAILURE, PENDING, SUCCESS
+from services.dicom import CHARSET_UTF8, FAILURE, PENDING, SUCCESS
 from services.storage import MWLStorage, WorklistItem
 
 logger = logging.getLogger(__name__)
@@ -82,6 +82,8 @@ def _build_worklist_response(self, item: WorklistItem) -> Dataset:
         ds = Dataset()
         sps_item = Dataset()
 
+        ds.SpecificCharacterSet = CHARSET_UTF8
+
         # Patient demographics
         ds.PatientID = item.patient_id
         ds.PatientName = item.patient_name
diff --git a/tests/services/mwl/test_c_find.py b/tests/services/mwl/test_c_find.py
index b6488753..309ee74f 100644
--- a/tests/services/mwl/test_c_find.py
+++ b/tests/services/mwl/test_c_find.py
@@ -5,7 +5,7 @@
 import pytest
 from pydicom import Dataset
 
-from services.dicom import FAILURE, PENDING, SUCCESS
+from services.dicom import CHARSET_UTF8, FAILURE, PENDING, SUCCESS
 from services.mwl.c_find import CFind
 from services.storage import WorklistItem
 
@@ -71,6 +71,7 @@ def test_call_with_single_result(self, handler, mock_storage, mock_event, sample
         status, ds = results[0]
         assert status == PENDING
         assert isinstance(ds, Dataset)
+        assert ds.SpecificCharacterSet == CHARSET_UTF8
         assert ds.PatientID == "9876543210"
         assert ds.AccessionNumber == "ACC001"
         # Final result: success