Philips Azurion - Page 179

Slager Wall Moon R
esults (LVA only)
Slager Wall Moon results are calculated for LVA only. The result page includes an image showing a
representaon of the Slager wall moon model, and graphs showing color-coded informaon
concerning the contribuon to overall EF from each area of the heart wall.
Figure 79 Slag
er Wall Moon
The Slager Wall Moon method is based on a contracon model and is described in medical literature:
• Slager, C.J., Hooghoudt, T.E.H., et al., “Quantave assessment of regional le ventricular moon
using endocardial landmarks”
• Slager, D.J., Hooghoudt, T.E.H., et al., “Le ventricular contour segmentaon from anatomical
landmark trajectories and its applicaon to wall moon analysis”
The method is used to describe the displacement between the end diastole and end systole of
parcular points on the le ventricular wall. The calculaons are based on images in standard RAO 30-
degree projecon, which is also required for the volume calculaon ulized.
The le side of the results page shows a composite graph of CREF (Regional Contribuon to global
Ejecon Fracon) values for the 20 segments. CREF values are derived from systolic wall displacement
data and le ventricular long-axis shortening. The individual anterior and posterior CREF values of the
paent are superimposed and connected by straight lines.
To compare the quantave results with those provided by the usual visual interpretaon, the le
ventricular boundary is divided into 5 anatomical regions, denoted Anterobasal, Anterolateral, Apical,
Diaphragmac, and Posterobasal. The segments are assigned to these regions and the CREF values for
the regions are ploed as well.
In LVA results, the gray band represents the wall moon parameters for a normal paent populaon,
collected by the Thorax Center, Erasmus University and the University Hospital Dijkzigt, Roerdam, The
Netherlands. The gray band shows the average normal value ±2 standard deviaons.
The le side of the results page shows the ED image chosen for le ventricular (EF) analysis with the
contours accepted during the analysis. Le ventricular segmental wall moon is computed along 20
straight lines, calculated from a mathemacal expression derived from anatomical landmark
trajectories in normal paents.
The 20 lines result from 20 well-dened ED contour points or segments, 10 anterior and 10 posterior.
The point or segment numbers are ploed along the contour. A center of contracon is dened for
each pair of 2 opposite ED contour points.
2D Quantave Analysis (Opon) LVA / RVA
Azurion Release 1.2 Ins
trucons for Use 179 Philips Healthcare 4522 203 52421