What Is DICOM and DIN 6868-157? Choosing the Right Medical Display Grade

Why "medical display" isn't one thing

A medical display is not a single category. The same panel can be acceptable in a nurses' station and unacceptable for radiology — and the standards that distinguish them are DICOM Part 14 and DIN 6868-157. Pick the wrong grade and you either overspend or, worse, fail the German RöV/QS audit or your hospital's clinical-image governance.

DICOM Part 14: the grayscale calibration

DICOM (Digital Imaging and Communications in Medicine) Part 14 defines the Grayscale Standard Display Function (GSDF) — a perceptually linear mapping from input pixel values to luminance. Calibrating a display to GSDF makes the same medical image look consistent across devices: a faint nodule that's visible on the radiologist's monitor will still be visible on the referring clinician's screen. A "DICOM mode" or DICOM calibration on a medical monitor means it's been measured and tuned to follow this curve.

DIN 6868-157: the German application-class standard

DIN 6868-157 goes a step further. It defines application classes based on what the display is used for, and sets minimum luminance, contrast, ambient illuminance and quality-assurance requirements for each:

• Diagnostic radiology — highest luminance, strict QA, often dual-head for mammography
• Clinical review — for image interpretation outside the reading room
• Other clinical use — image viewing where the display is not the basis of a primary diagnosis
• Image-based intervention (e.g., OR displays) — separate requirements driven by the procedure

If you operate in Germany, DIN 6868-157 compliance is a regulatory expectation. Outside Germany, it's a useful proxy: "DIN 6868-157 compliant" tells you the manufacturer has actually engineered the panel for clinical luminance and stability, not just slapped a sticker on a consumer monitor.

How to choose

1. Define the use case first: diagnostic radiology vs clinical review vs general patient-room display vs OR/surgical.
2. Match the standard: diagnostic = DICOM-calibrated + DIN 6868-157 diagnostic-class; review = DICOM mode + clinical-review class; OR/clinical = medical-grade build (IEC 60601-1) with DICOM mode optional.
3. Check QA support: does the display offer DICOM auto-calibration and a documented QA workflow? Without QA, calibration drifts and you fail audits.
4. Match the physical build: front IP65, fanless and antimicrobial for wipe-down clinical environments.

Where TSL Automation fits

TSL Automation supplies Avalue's medical display portfolio worldwide. The GMD series spans 23.8" / 27" / 32" / 55" / 65" from Full HD to 4K UHD and 4MP, supports DICOM calibration and colour calibration, with selected models compliant with DIN 6868-157 — suitable for operating-room displays, endoscopy visualisation and diagnostic imaging. The HID-2100 21.5" medical touch display supports DICOM mode with front IP65 and is designed for clinical workstations and bedside terminals. See our GMD/HID-2100 overview for the current lineup, or contact our team with your application class and we'll match the right model.