Vue PACS MR Perfusion User Guide
Unrestricted Internal Use
AE9362 C
Uncontrolled unless otherwise indicated
Page: 25 of 43
Vue PACS MR Perfusion User Guide - AE9362.docx
7.2 Calculating Perfusion Input Values
When you initially load the study, the application automatically calculates values that serve as a basis
for the perfusion calculation. You can manually correct the results to improve your reading accuracy.
7.2.1 Identifying the AIF and VOF
The application automatically segments arteries and veins to identify candidate AIF and VOF curves
that are to be used for the analysis
5
.
NOTE: The artery and vein marks do not necessarily appear on the same slice.
The graph shows the deviation of the spin-spin relaxation rate (
ΔR
2
) from its baseline value
throughout the scan for each marked artery (Ai) and vein (Vi), as well as the average graph for the
resulting AIF and VOF
2,3,4
.
7.2.2 Adding Arteries and Veins
When the Vessel Signal setting is set to Seeds (See Input State Settings in Section
),
you can decide to manually add arteries and veins in order to investigate the values of additional
voxels.
To add an artery or a vein –
1. Click
Add Artery
or
Add Vein
in the
Perfusion
ribbon.
The cursor changes to
.
2. On the TMIN image, click to add the artery or vein. The point is marked as A2 or v2
respectively.
Additional arteries and veins are marked as A3, A4 or V3, V4, etc.
A curve showing the values of the newly marked voxel is added to the graph.
By default, the VOF and AIF graph displays the curve of average values. When you add arteries and
veins, you can choose to display the curve for each vein, each artery and/or the average values. Each
curve has a different color, and its label is displayed at the right-hand side.
7.2.3 Using the Artery and Vein Segmentation Tool
You can use the AIF and VOF Segmentation tools to display automatically segmented veins and
arteries rather than display and add AIF and VOF candidate seeds. The
Show/Hide AIF