Ziehm Imaging, Inc.
Vision Installation Manual
MAN 06-0015, Rev. A
Page 32
M a i n t e n a n c e R e p o r t : I m a g e I n t e n s i f i e r F o r m a t
Image Intensifier
Format
Adjust the Image Intensifier Format
1. Open the iris diaphragm to the maximum setting.
2. Initiate fluoroscopy by pressing the foot switch.
3. All six of the iris diaphragm leaves must be visible at the edge of the monitor (as
shown in Figure 20). If this is not the case, then the iris control must be adjusted in
normal mode, per the Service Manual.
Cassette Format
Federal Regulation
Federal regulations (21 CRF 1020.31 (g) (2)) establish that, if full coverage of the
selected part of the image indicator has been set, then the total deviation of the edges
of the x-ray field from the corresponding edges of the selected part of the image indi-
cator, may not exceed 3% of SID in the plane of the image indicator in either length or
width of the x-ray field,. The absolute sum (disregarding the sign) of the deviation in
all orthogonal dimensions may not exceed 4% of the SID.
Note: In Radiographic mode, the iris collimator limits the cassette format.
1. Select Fluoroscopy.
2. Insert film into the cassette (14 x 14 inches).
3. Lay the cassette onto the image intensifier and fully open the iris diaphragm.
4. Select Radiography.
5. Set kV to 60.
6. Set radiographic exposure time long enough to fully expose the film without over-
exposing.
7. Initiate fluoroscopy by pressing the hand switch.
8. When the exposure is finished, release the hand switch.
9. Develop the film and measure the exposed x-ray field, as shown in Figure 22.
Write the results in the box below.
