Advanced Scanning: Annotating Scan Images
American Science and Engineering, Inc.
7-14
MINI
Z
Operator Manual 342-9000-1 Rev. B ECCN EAR99
•
Optionally, to view all of the scans in the current scan group at the same time in a gallery view,
tap the Mode button
to open the Scan screen in Gallery mode (see
Section 5.3, Scan
Gallery Mode Screen
). Tap the
Mode
button
again to return to the Scan Monitor mode
screen.
•
Optionally, to open a Reference image for ongoing comparison to the scans, tap the Back
button to return to the
Home Screen
. and then tap the
Review
button. When the Review screen
opens, tap the Mode button
to change to the Search mode of the Review screen (see
Section 9.4, Searching for Images
). To search for Reference images, in the search criteria (see
Figure 9-8
) select the check box next to the
Reference images
criterion.
•
Ambient lighting conditions between bright and dark rooms and times of day can make it
difficult to view the screen elements on the tablet. It is possible to switch between light and
dark color schemes at any time between performing scans. Using the
Settings
>
General
>
Skins
area, there are two buttons: light background, and dark background.
.
For looking at scan images in particular, another method is to apply the Reverse Video imaging
enhancement in the
Scan Monitor Mode Screen
or
Review View Mode Screen
. The Windows
Action Center
(
Section 3.7.6
) and the tablet Dashboard functions (
Section 11.2
) allow for
changing screen brightness to a limited extent
.
7.5
Annotating Scan Images
7.5.1
Image Physical Correlations
While performing a scan, each time the X-ray beam is started and stopped, a separate image is pro-
duced. The length of the target captured by the image depends on the rate at which the scanner is
moved during the scan, and the duration of time the scanner beam remains turned on. A recommended
rate of scanning is to move the scanner steadily across six inches (15 centimeters) of the scan path per
second of time. The maximum scan time is 30 seconds. This gives a maximum scan image that covers
15 feet (4.5 meters) of linear travel.
The width of the area scanned corresponds roughly to the width of the MINI Z housing, approximately
eight inches (20 centimeters). The width is indicated by the separation of the two laser guide beams. If
the scanner is farther from the target, the width of the target scanned increases in proportion.
The scanned image is a composite of the backscatter of multiple individual bursts of the X-ray beam
cutting across the horizontal plane of the scanner face, between the two laser guide beams. The dis-
tance between each scan, and the relative resolution of the image, is a function of the scan rate at the
time of detection. The individual detection bands are joined to form a continuous image when pro-
cessed by the MINI Z system.