Download Visage 7 Web Client User Manual

Viewers
The Visage 7 Web Client Window
Calibrate Distance
Permits calibration of distances in images.
While this tool is active, the mouse pointer looks like this:
Density Measurement
Permits measurement of grayscale values (pixel values) in images.
While this tool is active, the mouse pointer looks like this:
ROI Ellipse
Permits evaluation of circular or elliptical regions of interest (ROIs) in grayscale images.
While this tool is active, the mouse pointer looks like this:
ROI Rectangle
Permits evaluation of rectangular regions of interest (ROIs) in grayscale images.
While this tool is active, the mouse pointer looks like this:
Measured values are indicated in exact square millimeters (mm²; in CT and MR images),
estimated square millimeters (mm[?]²), or in pixels (pix) if ROI measurement in millimeters
is possible.
Caution
The relative error of the elliptical or rectangular ROI measurements is ± 2 pixels/
(shorter radius or shorter side).
For example:
Shorter radius or shorter side (measurement error):
10 pixels (± 20%), 20 pixels (± 10%), 50 pixels (± 4%), 100 pixels (± 2%)
Larger errors can occur if the image is displayed with reduced matrix size, that is if
not every original pixel is shown on the screen due to zoom-out. For optimum accuracy we recommend zooming into the structure of interest as much as possible.
The accuracy is further limited by the physical resolution of the acquisition itself. If
the monitor used for display does not permit exact pixel selection, the inaccuracy
can be greater still.
60
Visage 7 Web Client