TESTING OF SCREENS IN THE DIAGNOSIS

STANDARD-COMPLIANT TESTING IN ACCORDANCE WITH DIN 6868-157 AND IEC 62563

MEDICAL IMAGING

Medical imaging has made great progress in recent decades. Medical imaging can be used to anatomically depict the

human body with its organs and organ boundaries and thus to draw conclusions about pathological changes.

A doctor can also use medical imaging to distinguish pathological structures and differentiate between benign and malignant processes. A distinction must be made between anatomical and functional imaging, the combination of which can be used to draw conclusions about abnormalities at a molecular level.

Whereas in the past imaging was only used for existing damage, the trend nowadays is to detect diseases preventively before they even become noticeable. The aim is to combat widespread diseases such as dementia, arteriosclerosis and cancer in advance by quickly identifying molecular changes in a preventive medical examination.

Even today, medical imaging is still subject to continuous changes. Regardless of the method, the systems must become ever smaller (miniaturization), the data must

be digitized and, ideally, the radiation exposure of a device should be reduced or remain completely radiation-free.

The aim of medical imaging in the future is the transition from qualitative imaging to quantitative imaging, which uses numbers and data to ensure the reproducibility and comparability of measurement results and stores them in databases. This should greatly improve the information value of the images. 1,2

TESTING OF IMAGE DISPLAY DEVICES ACCORDING TO DIN 6868-157

Image quality is crucial for correct diagnosis. Image display systems are subject to constant tests (constancy test) in accordance with DIN 6868-157, which are carried out during the operating time, and acceptance tests during the installation of an image display system in accordance with DIN 6868-157. If the screen is moved to another location, it must undergo a new acceptance test. The entire image display chain with hardware, software and the image display system must be tested. This DIN standard specifies test procedures for workstations in CT, radiography and digital subtraction angiography. Monitors for MRI and ultrasound are not tested with this DIN.

TEST EQUIPMENT FOR TESTING SCREEN DISPLAY SYSTEMS

Luminance meters, illuminance meters, DICOM and test patterns are used as test equipment for acceptance and constancy tests.

The measuring devices used for illuminance and luminance must comply with class B according to DIN 5032-7 and must be calibratable and recalibratable.

ILLUMINANCE: MAVOLUX 5032-B

Measures reliably in daylight and artificial light sources

USB interface

Storage of measured values

Can also be used with accessories for measuring luminance

LUMINANCE: MAVOSPOT 2 USB

Measures luminance at an angle of 1°

Candela per square meter (cd/m²) or foot-lambert (fL)

Attachment and distance measurement

Acquisition, display and storage of data via software (USB interface)

1 A. Pachner, „Bildgebende Verfahren in der Medizin: Seminarvortrag“, 2004.

2 S. S. v. Obernitz, „Medizinische Bildgebung,“ IMAGING NETZWERK BERLIN, Berlin-Brandenburg, 2012 / 2013