GE Healthcare Brivo XR118 Service Manual page 159

GE H
EALTHCARE
D 5461425-8EN, R
IRECTION
8.) Multiple VOI-LUTs
Note:
9.) CR-Fallback
6
EVISION
The acquisition workstation can send two types of annotations: L/R markers or custom text.
Annotations may impact image display on PACS.
a.) Open the PACS Test Images 1, 4, 5, 6, 7, and 8
b.) Check if the display of the images is identical for images 1, 4, and 5
Record results in Table
c.) Check if the display of the images is identical for images 6, 7, and 8
Record results in Table
d.) Review the histogram for each images
Annotations may also change what the histogram looks like for each image. The L/R
annotations are burned into the image data, and therefore appear to stretch or compress the
histogram.
As indicated above, the GE acquisition workstation is capable of sending 3 VOI-LUTs in the
DICOM header. Some PACS recognize these 3 VOI-LUTs and allow the user to change
between each VOI-LUT. The user can change VOI-LUTs on PACS by selecting Normal,
Harder, or Softer options.
a.) Open PACS Test Image 3 on PACS to test the Normal/Harder/Softer options on PACS.
Record results in Table
b.) Harder should cause the image to have more contrast (smaller WW).
c.) Softer should cause the image to have lower contrast (larger WW).
The three options on PACS, Normal/Harder/Softer, should not be confused with the same
three options on the acquisition workstation. The three options on the acquisition
workstation changes the values of the WW before the VOI-LUT is calculated and the
image is sent to PACS. The 9 PACS Test Images are not intended to test the three
options on the acquisition workstation.
The acquisition workstation is capable of sending images as CR-modality if the PACS cannot
support or is configured to reject the DX-modality.
CR-Fallback effectively sends all images as Burn-on-Send.
This scenario should only be tested if CR-modality images are required on PACS or if the
PACS does not support DX modality images.
Chapter 6 - - Calibration
6-2, line number 12
6-2, line number 13
6-2, line number 14.
B XR118 S M
RIVO ERVICE ANUAL
Page 159