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Synapse® Mobility User Guide for HTML5
M
EASUREMENTS AND ANNOTATIONS
The application provides tools for making measurements and adding annotations, as described in this
section.
On touchscreen devices, use the
measurements and annotations.
Medical images are susceptible to magnification errors caused by differing patient sizes and
projection distances. If not corrected by the modality, these errors can affect the accuracy of
the calibration information contained in the image's DICOM header. Measurement values in
the Synapse® Mobility software are dependent on the calibration information provided by the
modality in the DICOM header. Accuracy also depends on the pixel spacing and slice interval
values that are provided in the DICOM header for the data set. Because of this,
measurements should be used for reference only until the accuracy of the DICOM header
information can be verified or the image information has been calibrated through the use of a
measurement instrument in the image.
Measurements rely on certain DICOM metadata to be in place, including Rescale Slope,
Rescale Intercept, and Pixel Spacing. In the event that this metadata is not contained in the
DICOM images being viewed, any measurements placed will be reported as "n/a".
Making measurements
The following types of measurement tools are available in the 2D and MIP/MPR view modes. In the 3D view
mode, only linear measurement is available.
Not all measurement types are supported in all modalities. If you attempt an unsupported
measurement, a visual cue will be displayed to indicate that the measurement is not applic-
able.
Confidential and Proprietary
precision loupe
to magnify finger placement for pixel-level precision of
Linear
Measures the distance between two points in the view
ROI
Measures the area, mean signal intensity, and standard deviation within an
ellipsoid region of interest (ROI)
Point
Measures the signal intensity of a selected pixel in the view
Angle
Measures the angle between definable segments
Cobb
Measures the Cobb angle between definable segments
DOC-0046692-A
Viewer
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