Making measurements
Distance measurements on DR Full Leg Full Spine images in NX are calibrated
based on the Estimated Radiographic Magnification Factor. The calibration
factor is calculated based on:
1.
the distance between the patient and the stitching grid of the Full Leg Full
Spine wall stand.
2.
the Source Image Distance (SID).
Both values can be entered by clicking the
ERMF Calibration
button in the
Editing environment of the NX software.
Figure 25: ERMF Calibration
Note
:
If the distance between the patient and the stitching grid is
not entered (or entered as zero), no calibration is applied on NX.
Measurements on the DR Full Leg Full Spine image are based on the
projection of the object on the stitching grid.
To make measurements, see the NX User Manual on Adding annotations to an
image and using the measurement tools.
To modify the Estimated Radiographic Magnification Factor, see the NX User
Manual on Adding an Estimated Radiographic Magnification Factor (ERMF).
5
1
4
6
8
10
7
3
9
2
1.
X-ray tube
2.
Patient location
3.
Stitching grid
4.
DR Detector
5.
Distance to be measured on the object, in a plane parallel to the stitching
grid
6.
Projection of the object on the stitching grid. This is the measured distance
on the DR Full Leg Full Spine image on NX if no calibration is applied.
62
| Full Leg Full Spine DR Retrofit System | Advanced Operation
0326A EN 20211014 1141
