Utilities
12.2 Histogram
With this function the gray scale or color distribution within a marked Region of Interest (ROI) will be
graphically displayed. Three histograms may be shown on the screen simultaneously.
There are three possibilities to calculate the gray scale or color distribution:
• 2D Histogram
(chapter 12.2.1)
• 3D Histogram
(chapter 12.2.2)
• Volume Histogram
(chapter 12.2.3)
12.2.1 2D Histogram
Operation:
1. Store a 2D mode, CFM mode or a PD mode image.
2. Switch on Histogram by pressing the [Utilities] key and selecting [Histogram].
The menu area changes to the Histogram menu.
3. Select the number of histogram: 1, 2 or 3.
4. Use the trackball to place the rectangle over the ROI.
5. The upper trackball key changes from position to size of the
ROI and back.
6. Press the right or left trackball key to calculate the histogram.
The histogram and corresponding number (left below the box) will be calculated and displayed.
Remarks:
* Measuring, text annotations, bodymarks entering as well as all
post-processing settings are not possible in Histogram mode.
Display of gray scale HISTOGRAM
X-axis: grayscale values from 0 to 255
Y-axis: incidence in %, normalized to maximal incidence
A: Average value
A = Sum of [values * presence]
Number of values in ROI
SD: Standard deviation
Voluson
®
730Pro - Basic User Manual
105831 Rev. 0 12-7
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