DICOM Standard – Consistency you can Trust

DICOM Part 14 is based on the human contrast sensitivity. This function makes it easier to see small relative changes in luminance in the dark areas of the image than in the bright areas because the whole picture will be shifted and recalculated towards the dark.

Displays that conform to the DICOM Part 14 standard maximize the number of grey tones that can be perceived on the display and provide a consistently high level of image quality across all DICOM displays which aids the speed and accuracy of diagnosis.


Guidelines

International Guidelines
In accordance with the European Directive 93/42/EEC (Medical Device Directive), including the amendments of the Council Directive 2007/47/EC. NEC MD Series Display Systems are registered as medical devices at DIMDI and succeeded pre-qualification for the German X-ray ordinance acceptance tests according to DIN 6868-157.

The Institute of Physics and Engineering in Medicine - UK Guidelines
Report 91
This document gives clear advice on which routine performance tests are essential and which are desirable, where to get information on how to do them, who should be doing them and how often they should be done.
The American Association of Physicists in Medicine - USA guidelines
AAPM TG18
Published guidelines and acceptance criteria for acceptance testing and quality control of medical display devices.
German Standards Institute (DIN) - Radiology Standards (NAR) - German Guidelines
DIN 6868-157 and DIN 6868-57
The document describes the acceptance and constancy test procedures of image display systems in their environment. In Germany, it replaces the old standard DIN V 6868-57 and is mandatory from 01. May 2015 for new installations. Main change is that the whole signal chain is now tested, starting with the workstation, display controller and in the end the image display device. Another change is that you need to calculate the deviation of the GSDF-curve which is requiring the use of a software. Besides those changes, new test patterns have been added, based on the AAPM TG18 guideline. Official testpatterns for DIN 6868-157 can be downloaded on the NAR webpage.

PAS (Publicly Announced Standard) 1054 - German Guidelines
Anforderungen und Prüfverfahren für digitale Mammographie-Einrichtungen

QS RL - German Guidelines
Qualitätssicherungs-Richtlinie

IEC 62563-1-2009 - Part 1 (Evaluation Methods) - International Guidelines
International Electrotechnical Commission
Medical electrical equipment and image display systems

JESRA-X-0093 - Japanese Guidelines
Japan Industries Association of Radiological Systems (JIRA)

EUREF - European Guidelines
European Reference Organisation for Quality Assured Breast Screening and Diagnostic Service


Calibration of NEC MD and MDview Series Products

Calibration of NEC Medical displays is performed by NEC's GammaCompMD QA software and allows you to:

  • ensure DICOM Part 14 conformance and therefore optimise image quality for that display for the life of the display
  • simulate the traditional use of Blue or Clear film on the display
  • uniquely calibrate and maintain the white-point for the life of the product
  • copy the display performance of one display to another to provide a consistent image across all displays within the department, hospital or across multiple sites maintains calibration locally or remotely via GammaCompMD QA software

Calibration1

ClearBase Parameter Setup

Calibration2

Sensor Setup

Calibration3

Calibration Setup

Stand-alone Calibration Feature of MD products

The On Screen Display (OSD) menu of the NEC MD Series includes a unique standalone calibration routine, which allows the self-calibration of the monitor or copy calibration settings from another monitor connected to the same workstation, without the need for any operating system or PC-based calibration application. This unique feature allows external calibration of NEC MD Series displays which are connected to modalities, Linux workstations or other PC operating systems not compatible with the standard calibration application. A self-calibration is easily performed by connecting an MDSVSensor calibration device (placed on the centre of the display panel) to the display's right USB port and starting the procedure in the monitor OSD.

Calibration4Self-calibration process

Calibration5
Copy
calibration process

 


Technology

NEC UA-SFT Technology (IPS)

UASFT1 IPS OFF 0 %
Brightness LC Molecules Unpolarised
UASFT2 IPS ON 50 %
Brightness LC Molecules Partially Polarised
UASFT3 IPS ON 100 %
Brightness LC Molecules Fully Polarised

NEC is the only leading medical display brand which is manufacturer of its own LCD modules. Backed by years of experience in the research and development of medical TFT displays, NEC’s latest Ultra-Advanced Super Fine TFT technology offers outstanding image quality for conventional X-ray as well as 3D reconstruction applications. An increase in aperture between the electrodes of the basic pixel of 20 %, in combination with advanced backlight technology, results in market leading brightness and contrast ratio values due to a higher transmission than SA-SFT.

Constant White Point

The MD211C2 and MD211C3 displays are shipped with a colour temperature of 7.500 Kelvin, defined as “Clear Base (CB)”. In all LED backlights, a non-proportional aging of the LEDs may cause a natural shift of the backlight from white to blue. Colour temperature calibration alleviates this colour shift by keeping the white tint constant, while brightness remains the same – the basis for excellent diagnostic quality. The “Clear Base” definition is selectable as target colour temperature for calibration with NEC GammaCompMD QA software. Individual white point calibration ensures that all displays within the hospital show a consistent image, imperative to consistent accurate diagnosis, especially when comparing images in a dual or multiple display configuration and between different workstations.

ConstantWhitePoint1 ConstantWhitePoint2
ConstantWhitePoint2a White Point
ConstantWhitePoint1a White Point Drift
ConstantWhitePoint2a Stable White Point


Backlight Stabilisation with re-calibratable Front Sensor

XLight The signal modifed by Colour Temperature settings from sensor
Built-in Luminance and Colour Coordinates and Temperature Sensor Brightness Colour Temperature Stabilisation

The luminance of the LED backlight is controlled and adjusted via the integrated front sensor and feedback system. That system is not only measuring, but also permanently controlling and re-aligning these settings to maintain the factory calibration. Any fluctuation in luminance at start-up, due to temperature changes or over the display lifetime is corrected in real-time.

The MD series displays are equipped with a state-of-the-art front sensor, which is significantly smaller in size. Compared to traditional backlight sensors which only measure the output of the backlight, NEC's front sensor is located in front of the screen and detects all instabilities caused by the backlight and the liquid crystal display, because it measures the combined effect of both elements.


Digital Uniformity Control (DUC)

The Digital Uniformity Control (DUC) function provides optimum backlight luminance uniformity which is considered difficult to attain due to the LED manufacturing process.

During the manufacturing of the display, the LCD panel characteristics are measured across the surface. A three dimensional matrix (x, y, L) is created and stored in the display. During normal operation of the display, these values are used to correct luminance and uniformity of the LCD panel.

DigitalUniformity1 Before DigitalUniformity2After

Ambient Light and Human Sensor

AmbientLight1

AmbientLight2

Ambient Light and Human Sensor

MD211C2 and MD211C3 are equipped with a recalibratable ambient light sensor. The ambient light compensation system compensates the DICOM compliance offset under changing lighting conditions by adapting the display contrast level (recalculating the gamma curve) to match the ambient light conditions.

A unique human sensor reduces the energy consumption by switching off the LED backlight when the user is away from the monitor. The MD211C2/MD211C3 monitor resumes normal operation when detecting the Infrared (IR) beam reflection upon the users return. The detection distance can be modified in the OSD menu.


LED Backlight

LogoLEDBacklight The MD211C2 and MD211C3 displays use White Edge LED backlighting instead of the cold cathode fluorescent (CCFL) backlighting, used by most other LCDs. LED backlights have a higher energy-efficiency than traditional CCFL lamps, resulting in higher brightness levels for enhanced diagnostic image quality at lower power consumption. The total cost of ownership for the hospital is reduced as LED backlights produce less heat and require less cooling. In addition, LED backlights deteriorate more slowly which increases the lifetime of the displays. LED backlights are mercury free and produce less environmental pollution on disposal. Backlight

Look-up Tables

LookUp1Before Smoothing

LookUp2After Smoothing

The internally programmed DICOM GSDF curve optimises the display to human visual performance in compliance with DICOM Part 14 standard, drastically improving the accuracy at which images can be interpreted.

Measurements from a built-in ambient light sensor are taken into account during calibration of the monitor. 1024 (10-bit) simultaneous shades of gray out of a look-up table of 12.277 (13.5-bit) ensure best-in-class image quality for women’s health


User Friendly and Ergonomic Design

Three preset user-selectable display configurations (luminance/gamma settings) are selectable according to the needs. The display’s current status can be checked easily in the On Screen Display (OSD) menu, such as display model, total operating time, actual luminance and calibration settings. The LED indicator informs the user about the display’s current operating status (stabilized – adjusted – power safe – error). The tilt and swivel stand gives best ergonomic support while reading medical images over a long period.

ErgonomicDesign

Special Anti-Reflection (AR) Coating

Low Reflecting Layer

Polarising Layers

Surface1

The NEC unique Anti-Glare solution reflects light away from the viewer

Surface2

Surface4

Surface3

Conventional Silica Gel creates random disturbing reflections

Traditional Anti-Glare (AG) coatings can result in loss of focus due to diffused reflection and increased noise of diffused light overlapping with the displayed image. The development of an LCD surface treatment that provides proper focus and noise properties in combination with a reduction of specular reflection was desired. The MD products are treated with a new special Anti-Reflection (AR) coating technology which reduces diffuse reflection and improves properties of noise, focus, contrast and viewing angle, achieving film-like black and accurate reproduction of images.


DisplayPort Connectivity

Various input signals, such as DisplayPort and DVI,  for compatibility with a wide range of high-speed, high-performance display controllers, result in maximum workflow efficiency.

The VESA digital video interface standard DisplayPort offers better image quality with higher bit-depth support and higher bandwidth performance, giving a particular benefit when manipulating large image datasets.

Connectivity

Display Controller Compatibility

Recommended Display Controllers
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