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Operation Manual
Init
Click the touch screen to initialize the position of a 3D image.
Histogram
NOTE: Histogram is available only for 2D and Power Doppler 3D images.
A shell histogram is calculated and displayed on the screen.
It represents the gray value distribution within the 2D and Power Doppler images of an object for
which VOCAL is performed. It also indicates Mean Gray (MG), Vascularization Index (VI), Flow Index (FI)
and Vascularization Flow Index (VFI).
Tips!
Formula for Shell Histogram:
X
MG: The average value of gray voxel brightness (gray)
MG = The sum of brightness (gray) / The total number of voxels
X
VI: The ratio of color voxels over all voxels within the shell
VI = The number of color voxels / The total number of voxels
X
FI: The average value of brightness (color) for color voxels within the shell
FI = The sum of brightness (color) / The total number of color voxels
X
VFI: The average value of brightness (color) for all voxels within the shell
VFI = The sum of brightness (color) / The total number of voxels
Niche
NOTE: This option is available with Volume CT.
Select from Type 1 to Type 8 by clicking the corresponding button or using the dial-button on the
touch screen.
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