8_Dental_Radiography

Student’s Laboratory, Department of Biophysics
3) Image window. It is possible to open more than one image at the same time. Management
of all opened windows is performed with: the Okno (Window) option in the Main menu,
or the three last buttons in the Toolbar.
4) Status bar. There is an additional help displayed in the status bar when some window
elements are pointed with the cursor.
5) Measurement tools.
area
distance measurements
measurements of the area of elliptical or rectangular regions
measurements of the area of any shape on the binary image
measurements of the average grey-scale level of a rectangular or elliptical
remove the measurement results from the image (all)
zoom out / zoom in
The first step in all measurements is to mark a region or a distance, which will be
measured. In order to define the line segment, click with the left mouse button the start point
and pressing the mouse button drag to the segment end. The area can be defined in the same
way but in this case an area diagonal is defined.
6) Image resolution panel: Rozdzielczość (resolution). There are three edit boxes connected
to the image resolution setting. The image resolution in Rozdzielczość edit box should be
expressed in dpi units (dot per inch). The Rozdzielczość edit box can be used when the
real image resolution is known. In that case the pxl edit box displays number of pixels
within the unit distance (the unit can be defined in Jednostki panel - see point 7).
Use the procedure described below to calculate the image resolution if the real image
resolution is not known:
a) Find the known distance on the image (e.g. a scale visible on the picture, total width of
the radiogram film or any defined, given dimension),
b) Check pixel unit in Jednostki panel,
c) Measure the known distance using the pixel unit and remember (or mark in the
picture) the result,
d) Change the unit in Jednostki panel accordingly to your needs and put the result into
the pxl edit box,
Dental Radiography 12