diff --git a/core-buffer/include/RamBuffer.hpp b/core-buffer/include/RamBuffer.hpp
index 45b67a1..91872cb 100644
--- a/core-buffer/include/RamBuffer.hpp
+++ b/core-buffer/include/RamBuffer.hpp
@@ -30,7 +30,9 @@ public:
                      const uint64_t module_id,
                      ModuleFrame &meta,
                      char *data) const;
-    char* read_image(const uint64_t pulse_id, ImageMetadata &image_meta) const;
+    char* read_image(const uint64_t pulse_id) const;
+    void assemble_image(
+            const uint64_t pulse_id, ImageMetadata &image_meta) const;
 };
 
 
diff --git a/core-buffer/src/RamBuffer.cpp b/core-buffer/src/RamBuffer.cpp
index 581ab73..ff14011 100644
--- a/core-buffer/src/RamBuffer.cpp
+++ b/core-buffer/src/RamBuffer.cpp
@@ -85,15 +85,12 @@ void RamBuffer::read_frame(
     memcpy(dst_data, src_data, MODULE_N_BYTES);
 }
 
-char* RamBuffer::read_image(const uint64_t pulse_id,
-                            ImageMetadata &image_meta) const
+void RamBuffer::assemble_image(
+        const uint64_t pulse_id, ImageMetadata &image_meta) const
 {
     const size_t slot_n = pulse_id % n_slots_;
-
     ModuleFrame *src_meta = meta_buffer_ + (n_modules_ * slot_n);
 
-    char *src_data = image_buffer_ + (image_bytes_ * slot_n);
-
     auto is_pulse_init = false;
     auto is_good_image = true;
 
@@ -158,7 +155,12 @@ char* RamBuffer::read_image(const uint64_t pulse_id,
         image_meta.frame_index = 0;
         image_meta.daq_rec = 0;
     }
+}
+
+char* RamBuffer::read_image(const uint64_t pulse_id) const
+{
+    const size_t slot_n = pulse_id % n_slots_;
+    char *src_data = image_buffer_ + (image_bytes_ * slot_n);
 
     return src_data;
 }
-
diff --git a/core-buffer/test/test_RamBuffer.cpp b/core-buffer/test/test_RamBuffer.cpp
index 55c3a7c..d28dd81 100644
--- a/core-buffer/test/test_RamBuffer.cpp
+++ b/core-buffer/test/test_RamBuffer.cpp
@@ -29,7 +29,7 @@ TEST(RamBuffer, simple_store)
     }
 
     ImageMetadata image_meta;
-    buffer.read_image(frame_meta.pulse_id, image_meta);
+    buffer.assemble_image(frame_meta.pulse_id, image_meta);
     ASSERT_EQ(image_meta.pulse_id, frame_meta.pulse_id);
     ASSERT_EQ(image_meta.daq_rec, frame_meta.daq_rec);
     ASSERT_EQ(image_meta.frame_index, frame_meta.frame_index);