Making Measurements - AGFA DR 800 User Manual

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. This distance is
entered during the acquisition workflow.
2. the Source Image Distance (SID). This distance is received together with
the X-Ray generator parameters.
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).
1
X-ray tube
1.
Patient location
2.
Stitching grid
3.
DR Detector
4.
Distance to be measured on the object, in a plane parallel to the stitching
5.
grid
Projection of the object on the stitching grid. This is the measured distance
6.
on the DR Full Leg Full Spine image on NX if no calibration is applied.
Projection of the object on the DR Detector. This is the measured distance
7.
on a partial image on NX.
Distance between the plane in which the measurement is made and the
8.
stitching grid. This distance is estimated by the user and entered at the
touch screen console while preparing the examination.
Distance between the stitching grid and the DR Detector. This distance is
9.
configured during installation of the system.
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.
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DR 800 | Full Leg Full Spine | 185
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0392C EN 20210309 1049