Digital Display Specifications (as per RACS DDI Options)

1.
Image Data
Format

2.
Image Data
Distribution

3.
Image Data
Reading

4.
Image Data
Display

 5.
Image Data
Manipulation

 6.
Image Data
Storage 

The quality of the monitor is a major factor in achieving diagnostic quality imaging.

Critical issues relate to spatial resolution, contrast, refresh rate and ability to calibrate the digital display. 

While the LCD monitor has largely taken over from the CRT, alternative digital displays may be suitable depending on their functionality.


Stage 4

Image Data Display

Optimum

Acceptable (qualified)

 

Greyscale Standard Display Function DICOM Format (GSDF)  (16)and DICOM compliant, calibratable digital display

Minimum resolution:

  • CT/MR – 80 ppi
  • CR/DR – 100 ppi
  • Mammogram – 127ppi

Minimum luminescence

  •  175 Candela(17)

    (See later specifications -  Diagnostic Quality Digital Display)

 

1.    Appropriate sized 100 ppi non GSDF-compliant LCD at clinician’s discretion.

2.    Lower resolution (i.e. lower resolution than specified under Optimal specifications) monitors may allow the viewing of images for non-diagnostic purposes.

3.    Direct observation of printed transparent film on view box of suitable intensity and with low ambient light.

 

Click to link to Vendor Page

Suitable display requires an adequate monitor (ideally GSDF Part 14 compliant), with minimum luminance of 175 Cd/m2, minimum contrast ratio of 1:500, and spatial resolution of 100dpi or greater (e.g. 20” 1800 x 1200 2MP GSDF compliant) and Calibratable with SMPT (Society of Motion Picture and Television Engineers standard), depending on modality:

Modality

Minimum Spatial Resolution

Typical Monitor Resolution

CR  / DR

100dpi

1800x1200 Monochrome/Colour 
( approx 100 dpi on 20” Monitor)

CT

80 dpi

1024x768 Colour/Monochrome

US

80 dpi

1024x768 Colour/Monochrome

Mammography

127dpi

Minimum: 3MP Monochrome

Recommended: 5MP Monochrome

MRI

80 dpi

1024x768 Colour/Monochrome


For optimal review, the spatial resolution of the digital display should match the native resolution of the image to be displayed.

Where general diagnostic digital image review is anticipated, the monitor resolution should be at a level suitable for viewing CR images.  Where larger screens are required such as in an operating theatre, this should be supplemented by a monitor as specified below to allow more accurate review. 

Although the spatial resolution of CR may exceed 100dpi, the utilisation of the zoom function in the viewing software will allow adequate spatial resolution where required.

Diagnostic review of Mammography requires higher resolution digital display screens (18).

 

Specific Options - Stage 4 – Viewing Hardware (Diagnostic Quality Digital Display - ACR Class 2)

Image resolution 

≥ 100 dpi (ppi) 

( ≥ 80 ppi if limited to small matrix - CT / MRI etc )

Minimum Screen size

Office / Clinic – at least one 20” per examination station
Operating Theatre – two 24” screens (or equivalent) with access to additional mobile monitors

Brightness

≥ 175 Cd/m2

Contrast Ratio 

≥ 1:500

Luminance Uniformity

≤ +/- 15% from centre to corners

DICOM Part 14 GSDF conformance

at least gamma adjustment, ideally LUT (Look Up Tables)

Chromaticity

∆ (u′, v′) ≤ 0.01

Refresh rate

≥ 60Hz

Dead pixel tolerance

< 10 per screen (<15 for screens of 24” or above)

Viewing Angle

≥ 800 Horizontal, 500 Vertical

Pixel Depth

≥ 8 bit

Calibration ability

External or internal, with option to upgrade to network management by installation of appropriate video card

Input/Output signal

DVI


Computer Hardware and Network Specification

A minimum hardware specification is a single portable PC with as powerful a processor and as much memory as possible. A high end separate graphics card is required. The general specification should exceed if possible the minimum requirements specified by the DICOM viewing software. Diagnostic image data should ideally be partitioned, backed up and secured separate from the primary practice management system.

Click the link below to go to the Vendor Page which contains details of potential commercial suppliers of digital display hardware. 
 

Click to Link to Vendor Page



 


    
 
 
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