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2 Add/Subtract
Considerations:
•
Add/Subtract can process a maximum of 1,000 images. To select a range of images, select
the first image in the range, hold the shift key and select the last image in the range.
•
Add/Subtract images are displayed in the series type column of the Series list as either
processing pairs (Proc) or combination (Comb).
○
Proc is the result of processing pairs of images that have identical locations in the
patient's body. Proc series can be used like any other series of acquisition images, for
example, geometrical measurements, reformatting, 3D reconstructions, etc.
○
Comb is the result of a combination of images having different locations in the patient's
body. The absolute anatomical coordinates accompanying Comb series are not accurate
and therefore only relative geometrical measurements (for example, distance, angle or
area) made within a resulting image are accurate.
2.1 Add/Subtract basic terminology
Term
Image addition
Image subtraction
Maximum pixel value extraction
Minimum pixel value extraction
Binding Series
Accept negative pixels
Ratio slider
Disable Normalization
2.2 Add/Subtract and Image Combination window
In File Manager, highlight the exam you want to work with, right click and select [Add/Sub].
Alternatively, highlight the series you want to work with, right click and select [Open with], then
[Add/Sub]. You can do the same for individual images. Highlight the image you want to work
with, right click and select [Open with], then [Add/Sub]
412
Adds image intensity values pixel by pixel and is useful for adding thin slices together to get
a thicker slice.
Subtracts image intensity values pixel by pixel and is useful to evaluate contrasted vessels.
NOTE:
Patient movement and breathing between the images can affect the quality of
the subtraction.
Locates maximum image-intensity values pixel by pixel. This is useful for contrasted vessels
or calcifications.
Locates minimum image intensity values pixel by pixel. Useful when evaluating soft tissue.
Creates a new series consisting of copies of selected images from one or more existing ser‐
ies. Useful if you have images in two separate series and want them in one series to perform
3D or Reformat.
NOTE:
Save State information is not maintained in the new series generated with
Binding Series.
Allows negative pixel values in the resulting image, otherwise all negative pixel values are
set to zero.
When both [Select Set] buttons are used during addition or subtraction, equal weighting is
applied to the two pixels in each pair. You can change that with the
Performs a pixel-by-pixel addition or subtraction. The images are not normalized.
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
Definition
Ratio slider.
2 Add/Subtract
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Table of Contents
Troubleshooting
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Questions and answers
need a part number for the Integrated Cardiac Patient Monitor, patient grounding strap + cable
How do I clear Ge Revolution collision sensor
To clear the collision sensor on a GE Revolution CT, remove any obstructions detected by the sensors located beneath the front and back of the table. Once the area is clear, you can continue positioning the table.
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