Philips Azurion - Volume Methods; Regression Formulas; Wall Motion Results

Volume Methods
V
olume Methods: Area Length method
The Area Length method is based on a model of a three-dimensional ellipsoid that is symmetric around
its long axis. The resulng volume is corrected with an appropriate regression formula.
Volume Methods: Simpson method
The Simpson method, or slice summaon method, is based on a set of circular slices of equal thickness
perpendicular to the long axis. The resulng volume is corrected with an appropriate regression
formula.
Regression Formulas
The volume calculated from a two-dimensional image has to be corrected to be used as a
representaon of the three dimensional le ventricle volume.
CAUTION
A s
tandard regression formula is used during analysis. This can be changed in the customizaon
sengs. However, analysis results may not be accurate if you choose to use a non-standard
regression formula that has not been clinically validated.
NOTE The results of the analysis are heavily inuenced by the used regression formula, therefore
care should be taken when selecng these factors.
NOTE For standardizaon, it is recommended to use the same predened method and regression
formulas throughout the department.
Predened Regression Formula
Dierent volume correcon formulas are dened to correct the ED and ES Volumes. The correcon
formulas are dened in the customizaon screens and depend on the volume calculaon method
selected (for both monoplane and biplane).
User Dened Regression Formula
The calculaon of corrected volumes is as follows (for both monoplane and biplane):
• EDV
corr
= [user dened factor] * EDV
calc
+ [user dened constant]
• ESV
corr
= [user dened factor] * ESV
calc
+ [user dened constant]
You are free to dene opmal formulas to correct the ED and ES volumes. User-dened factors can be
dierent for the Area Length method or the Simpson method.
If you are only interested in the percentage EF, this can be obtained by skipping the calibraon
procedure.
The formula that is used for the results in the report is indicated in the report.
Wall Moon Results
Wall Moon results are not displayed by default. To include Wall Moon results in the results page,
select the Wall Moon opons in the control panel:
• Slager Wall Moon
• Centerline Wall Moon
2D Quant
ave Analysis (Opon) LVA / RVA
Azurion Release 1.2 Ins
trucons for Use 178 Philips Healthcare 4522 203 52421