Siemens ARTIS 2 S Service Manual Page 514

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Quantification
Quantitative Ventricular Analysis (LVA)
98 / 104 AXA4-100.620.08.01.02 Operator Manual
Regional wall motion analysis
The regional wall motion analysis results are presented on a further page of the
detailed report, if configured.
A graph with the ED and ES contours is displayed. It is divided into five segments,
with a line superimposed through the aortic valve center. This line intersects the
apical center in the mathematical center of gravity.
The points on the ventricular wall are assumed to move towards the central point
at 69% of the distance between the antero-lateral edge of the aortic valve and
the apex in the ED phase.
The regional wall motion analysis model describes the average shortening of the
five radial segments which contribute to the ejection fraction (EF). The sixth re-
gion is the mitral valve region which is not taken into account.
To determine the segments both in the ED and the ES contour, the lower mitral
valve point as well as the center of gravity are determined. The ED and ES left
ventricular wall between the anterior aortic point and the lower mitral valve point
is divided into five anatomical wall segments.
The radial lines separating the anterior segments are determined on the basis of
the angle between the anterior aortic valve point and the apex. The radial lines
separating the inferior segments are determined on the basis of the angle be-
tween the lower mitral valve point and the apex.
For the five segments of the left ventricle, the average shortening between ED
and ES is calculated and indicated as a percentage. The contribution of each seg-
ment to the total shortening is displayed in the table.
o Antero-basal [%]
o Antero-lateral [%]
o Apical [%.]
o Diaphragmatic [%]
o Postero-basal [%]
The calculations are considered valid for the same standard RAO 30 projection
that is used for the global ejection fraction calculation.
The method is described in the specialist literature (see ref. 8. in the bibliog-
raphy).
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