Siemens ARTIS 2 S Service Manual Page 415

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Exam Sets
Parameters for Exam Sets
AXIOM Artis AXA4-100.620.08.01.02 39 / 40
The following table shows which parameters are used by an Auto algorithm:
Digital density optimization (DDO)
DDO (harmonization) reduces the dynamic range of an image (bright areas will be
less bright, dark areas will be less dark). By reducing the dynamic range, it is pos-
sible to increase the contrast without clipping bright or dark areas. This allows you
to increase the contrast of details without saturation of the image in bright or dark
areas.
Setting k-min. k-max. Usage
Auto1 1.25 2.0 "Cardiac speed", less integration, more noise
but almost no lag.
Auto2 1.25 2.0 "Cardiac standard", good relationship be-
tween noise and lag for cardiac examinations
Auto3 1.38 2.5 "Angio" standard.
Auto4 1.88 3.0 "Roadmap" setup, very high integration but
also high lag, almost no noise.
For quantification, please note:
If the vessels are wide, DDO can reduce the accuracy while determining the
density values, for example:
o 5 mm vessel, 17 cm image format, 80% DDO Density value error: -17%
o 2 mm vessel, 17 cm image format, 80% DDO Density value error: -3%
With more than 30% DDO, densitometric measurement is no more reliable.
Too much DDO/harmonization can change image display in such a way that a
diagnosis is no longer possible.
u Check the image impression after using DDO/harmonization.
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Comments to this Manuals

Muhammad Tayyab 29 May 2024 | 13:54:32

please change download setting

Luis Garcis 14 Aug 2025 | 03:20:27

Good publicatoon