Calculating Perfusion Input Values; Identifying The Aif And Vof; Adding Arteries And Veins; Using The Artery And Vein Segmentation Tool - Carestream Vue PACS MR Diffusion User Manual

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
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
throughout the scan for each marked artery (Ai) and vein (Vi), as well as the average graph for the
2,3,4
resulting AIF and VOF

7.2.2 Adding Arteries and Veins

When the Vessel Signal setting is set to Seeds (See Input State Settings in Section 8
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
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
Vue PACS MR Perfusion User Guide
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Vue PACS MR Perfusion User Guide - AE9362.docx
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or Add Vein in the Perfusion ribbon.
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Uncontrolled unless otherwise indicated
) from its baseline value
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Using
Unrestricted Internal Use
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Settings),