Eleva Workspot 1.x Training UNIQUE · EVRad DiDi in semi mode Company confidential Eleva Workspot...

Eleva Workspot 1.x Training

UNIQUE

State: April 2007

Purpose of this PresentationPurpose of this Presentation

• General– See the differences in the user interfaces– Understand the principles of image ranging– Understand the UNIQUE image processing

2Company confidential Eleva Workspot – Training Material – J.Schulze - April 2007

ContentContent

1. User Interfaces EasyVision RAD, Digital Diagnost and Eleva Workspot 1.x

2 Ranging with UNIQUE2. Ranging with UNIQUE

3. UNIQUE image processing


UNIQUE P i i lUNIQUE Principles

• MultiresolutionEnhances details of all sizes– Enhances details of all sizes

• Nonlinear– Makes the invisible visible, not the obvious

• Universal– Same parameters for all detectors/systems


Eleva Workspot – UNIQUEEleva Workspot UNIQUEraw image, 12bit

Autoshutter

RangerEDR

UNIQUEi

S & Lprocessing

Image & Parameter Display


processed image, 12bit

User interface, ExamplesUser interface, Examples

EVRad DiDi in semi mode


ElevaEleva Workspot 1.x

Contrast/Brightnessfor the normal user

Image processing

for the experiencedfor the experienced

user

• Contrast/Brightnessg

• Enhancement

• Object Details

• Noise reduction

f


Expert panel for the application engineer

Wh i ?

Ranging

• Why ranging?– Film/Monitor range is smaller than the range of values obtained from

the detector (e.g. 8 bit versus 14 bit)If the whole range of image data is mapped to the output range– If the whole range of image data is mapped to the output range, contrast will be far too low

• Ranging:– Therefore, the key values of the anatomically relevant regions have to , y y g

be determined


RangerThe ranger selects the collimated area (grey box)collimated area (grey box)

The range field is applied (green box - here 100%)

The green dots indicate the pixels which have a density of the key-percentage value (25%)(25%)

The key-percentage value defines where in the whole histogram the dose is which ishistogram the dose is which is relevant for the reporting (P1)

This value is based on the pixels not on the relativepixels, not on the relative position in the histogram – in our case the P1 defines: 25% of the pixels are left (which is


brighter), 75% right (which is darker) of the red line

R P ibl fi ldRanger - Possible ranger fields

Full

Quarter

Full

SlitHalf Slit


For Mammo

Different anatomical groups require special geometry of ranger fields


New Ranger parameter "Ranger Area" = Shutter or Fullsize

•All "normal" UNIQUE processing methods use Shutter today (R1.0x and R1.1)•Fullsize was created e.g. for mammography constancy check with phantomsto achieve a shutter-independent ranging.

Fullsize (new): Green ranging field box independent from shutters,but relative to whole detector

Shutter: Green ranging field box inside the shutters:


Save a processing protocol from applicationSave a processing protocol from applicationAttention! An image is UNIQUE processed

and ranged in auto-mode – what are in most cases Thorax examinationscases Thorax examinations.

If for this image the processing will be manipulated with the Contrast/Brightness or the Processing-tool have in mind that in

Qsuch a case the UNIQUE-ranger switches from the auto-mode to the semi-mode. This is no problem for the current image because it is adjusted right now.j g

If such a processing is the base for a new image processing which should be stored in Eleva Workspot or if it overwrites an existing processing protocol the ranger from now onprocessing protocol the ranger from now on is set to semi which could give massive problems with the image quality of all Thorax examinations in the future.

If t t k t h f>>> If you want to make permanent changes of a processing protocol where UNIQUE is set to auto-mode, use only the expert-panel for these settings!


g

UNIQUE C tUNIQUE - Curve types

• LIN Linear• SWL Symmetrical white latitudey• SCL Symmetrical chest latitude• FB Film bone• FC Film chest• FC Film chest


D it d G i S i M dDensity and Gamma in Semi-Mode

• The density slider defines the optical density in the point where the ROI (P1) was y p y p ( )found

• The Gamma slider defines the steepness of the gamma curve.

Image Histogram LUT (semi)

Out

Image Histogram LUT (semi)

In


P1P1

D it 1 d D it 2 i A t M dDensity 1 and Density 2 in Auto-Mode

• Density 1 defines the optical density of the lung P2• Density 2 specifies density of the mediastinum P1

changing Density 1or 2 changes steepness of the curve (contrast)changing Density 1or 2 changes steepness of the curve (contrast)

Image Histogram LUT (auto)

Out

Image Histogram LUT (auto)

In


P1P1 P2 P2

Structure Boost is enhancement of weak contrastsStructure Boost is enhancement of weak contrasts

amplification

0 1 2 3

amplification

60 60

40

20

0

40

20

00 150 0 1500

-20

-40

0

-20

-40

local input local output -60 -60


contrast contrast

Structure Preference is amplification ofStructure Preference is amplification offine details (+ values) --- big structures (- values)

reduce reduce reducelowpass

lowpass

lowpass

lowpass

compose

enhance enhance enhance enhance


Structure Preference

reduce reduce reduce

Structure Preferencefine details (+ values) --- big structures (- values)

lowpass

lowpass

lowpass

lowpass

compose

enhance enhance enhance enhance


D il CDetail Contrast is enhancement of strong contrasts

• Number A:normal contrast film cannotnormal contrast film cannot show all grey-levels

• Number B:a low contrast film can show all grey-levels, but there is no ‘contrast’ in the image!no contrast in the image!


D il C E hDetail Contrast Enhancement



Original image



Low pass filter



Corrected image


UNIQUE nonlinear enhancement distinction of 3 dimensionsUNIQUE nonlinear enhancement, distinction of 3 dimensions

Amplification

Sub bands

large

small


Original contrast

UNIQUE nonlinear enhancement DC works like DCE/DRRUNIQUE nonlinear enhancement, DC works like DCE/DRRno enhancementno enhancement

Amplification

Sub bands

DCDCConstant over the

whole range


Original contrast

UNIQUE nonlinear enhancement DC works like DCE/DRRUNIQUE nonlinear enhancement, DC works like DCE/DRRmedium enhancementmedium enhancement

Amplification

Sub bands


whole range


Original contrast

UNIQUE nonlinear enhancement DC works like DCE/DRRUNIQUE nonlinear enhancement, DC works like DCE/DRRfull enhancementfull enhancement

Amplification

Sub bands


whole range


Original contrast

UNIQUE nonlinear enhancement DC works like DCE/DRRUNIQUE nonlinear enhancement, DC works like DCE/DRR

Amplification

Sub bands


whole range


Original contrast

UNIQUE nonlinear enhancement DC works like DCE/DRR but do not enhanceUNIQUE nonlinear enhancement, DC works like DCE/DRR, but do not enhance initially already high contrasts

SCLAmplification SCL

Sub bands


whole range


Original contrast

UNIQUE nonlinear enhancement add additional structure boost for initiallyUNIQUE nonlinear enhancement, add additional structure boost for initially weak contrasts

WCLAmplification WCL

Sub bands

SB


Original contrast

UNIQUE nonlinear enhancement add additional structure boost not equal forUNIQUE nonlinear enhancement, add additional structure boost, not equal for all subbands

Amplification Structure preferenceHere: slider to the right decreases“large” subbands

Sub bands

g

small


Original contrast

Structure preferenceStructure preference

3.5

amplification factor 'hand'

1 01.52.02.53.03.5

3.5

amplification factor 'dorsal spine'

0 5 10 15 20 25 30 12

34

56

subband

1.0

1.01.52.02.53.0

25 30 35 40local input contrast 01

amplification factor 'pelvis' 0 5 10 15 20 25 30 35 40local input contrast 01

23

45

6

subband

2 02.53.03.5

04

56

1.01.52.0


0 5 10 15 20 25 30 35 40local input contrast 01

23subband

St t B t Off tStructure Boost Offset

Structure boostOffset = max

catio

nStructure boost

=constant

Am

plifi

c

Offset = 0

Offset = 1


C t t b lContrast balance• Contrast balance slider is used to define if the enhancements are to be

applied only in the ROI (centre of Histogram), or in the full histogram.pp y ( g ), g• CB = 1 Gaussian curve like film/screen• CB = 0 Enhancement independent from ROI• This is a nice tool to show or suppress the skin border in Mammograms

CB = 0CB = 0

ampl

CB = 0.7

ification

CB = 1


CB = 1

ROI X-ray energy

N i filtNoise filter

catio

n NLA

mpl

ific

NS = maxDensity

NS = max

NC

NS = min

The NL (Noise limit) slider specifies at which

1.0

NC The NL (Noise limit) slider specifies at whichdensity the noise filter becomes active.The NS (Noise step) slider specifies how fluent the filter becomes active.


the filter becomes active.The NC (Noise compensation) slider specifies how much noise compensation is applied.

Eleva Workspot 1.x Training UNIQUE · EVRad DiDi in semi mode Company confidential Eleva Workspot...

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