GE Healthcare eXplore Locus SP, Service Manual

Page: 106 / 266

GE H
EALTHCARE
D
IRECTION
5158821-100, R
EVISION
3
E
X
PLORE
L
OCUS
SP S
ERVICE
G
UIDE
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7.2.3 Start Transform1 File Creation
WHY DO THIS?
The goal here is to remove the distortion caused by the fiber optic taper. This is accomplished by
capturing a raw image of the bebe grid which is a known standard (equally spaced bebes). Using
the Transgen program, we can specify the distance between pixels on the detector - therefore,
when we unwarp an acquired image, the corresponding pixels will be properly represented in
MicroView. The end result means that when we unwarp the acquired bebe grid, it will be an
accurate representation of the actual (physical) grid.
To start the Transform1 file creation:
1. Correct the grid image using the
Calibration Tools program as follows:
- click on the Correct tab
- in the VFF to Correct field, find the
newly captured image
- use the Browse buttons to find the
bright and dark files created earlier
- click the Correct button (the
corrected file is named
corrected.vff and it is stored in the
same folder in which the captured
imaged was stored)
2. Double-click on corrected.vff in Windows Explorer to load the image into MicroView and
confirm that the grid has been corrected (image looks cleaner with less noise in between the
bebes).
3. Double-click on the W and L parameters in the lower right of the screen. Change the Update
mode to
Delayed updates . This only needs to be changed once.