Philips Azurion - 10.5 QCA; QVA; 10.5.1 QCA; QVA Tasks

Errors in the c
alibraon factor propagate proporonally into QCA/QVA distance measurement. Relave
errors mulply with a factor of approximately 2 to 3 in the LVA/RVA computaons of absolute ventricle
volumes. Ejecon fracon, however, is not aected by these calibraon inaccuracies.
Guidance for Manual Catheter Calibraon
• Use a radiopaque catheter.
• Use a lled catheter to improve detecon and accuracy.
• Philips Medical Systems does not recommend catheter calibraon on empty catheters or catheters
below 6 French, as this may lead to an inaccurate calibraon factor. The error can be 20% or more.
2D-QA does not support catheters below 4 French.
• To improve accuracy, avoid low dose and high frame rates.
Guidance for Manual Sphere Calibraon
It is possible to use two dierent series for imaging the sphere and the anatomy under invesgaon.
However, ensure that the sphere and the anatomy have the same geometrical magnicaon in the X-
ray image. This means that the images are acquired with the following characteriscs:
• The same X-ray focus-object distance and same object-detector distance.
• The same angulaon and rotaon angles.
• The same table height.
Checking calibraon accuracy for your preferred catheter
1 Posion a catheter and a ruler close together, acquire images, and then perform catheter
calibraon.
2 In the X-ray image perform a QCA length measurement along the catheter between two marks on
the ruler and compare your result with the actual distance from the ruler.
10.5 QCA / QVA
The QCA and QVA applicaons have similar tasks, and they are described together in the following
secons.
Quantave Coronary Analysis (QCA)
You use QCA to mark the contours of a coronary artery in the heart, analyze a stenosis, and create,
store and print reports of the analysis.
Quantave Vascular Analysis (QVA)
You use QVA to mark the contours of aorc and peripheral arteries, analyse a stenosis, and create,
store and print reports of the analysis.
10.5.1 QCA / QVA Tasks
A set of predened tasks is used to ensure coronary or vascular analysis is performed in a logical way.
The QCA and QVA applicaons provide the following tasks in order:
• Select Series
• Calibraon
• Analysis
• Result
When a series is selected, the system progresses automacally to the Calibraon task.
2D Quantave Analysis (Opon) QCA / QVA
Azurion Release 1.2 Ins
trucons for Use 160 Philips Healthcare 4522 203 52421