User guide

LBA-USB User Guide Document No: 11294 Page 91
3.6 Histogram Display Window
This window is only visible when Histogram is enabled in the Computations dialog
box. This window can be minimized and resized.
This bar chart provides a fluence histogram of the currently displayed frame of data.
Each bar in the display represents a fluence bucket. Each bucket describes a range of
quantified fluence values. The minimum bucket size is based upon a single count of the
8/10/12/14/15-bit digitized output of the A to D converter or digital camera. The bucket
will be scaled if energy calibration is in use. See section 4.22 for more information.
The numbers displayed along the left edge of the histogram indicate the lower value of
each bucket. Set the Bucket Size by using the edit/spin control at the top of the
histogram display window, or change it in the Computations dialog box.
The numbers along the right edge of the display indicate the total count of the number
of pixels that have been placed into each of the buckets. The length of the bar indicates
the depth to which the bucket is filled. Zero count is on the left. The Display Depth
indicator shows the current maximum value of the horizontal scale. The horizontal scale
is auto-ranged to the current maximum count.
The horizontal scale can be magnified, so that smaller values can be viewed more easily.
With the horizontal scroll bar moved all the way to the right, the right edge of the bar
display represents the bucket with the most number of pixels in it. Sliding this scroll bar
to the left expands the scale.
Move the vertical scroll bar to view buckets that may extend above or below the size of
the window.