Ziehm Imaging, Inc. VISION, Руководство по установке

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Ziehm Imaging, Inc. Vision Installation Manual MAN 06-0015, Rev. A Page 31
M a i n t e n a n c e R e p o r t : C h e c k C o l l i m a t i o n
14. Mark the position of the sliders on the light cross. (With a fluorescent screen,
mark the edge of the radiation field).
15. Measure the deviations of A
1
, B
1
, C and D (see Figure 20.
Fig. 21 X-Ray Field Observed on Monitor
1. Calculate the length deviation.
L =
∆Α + ∆
C
2. Calculate the width deviation.
W =
∆
B +
∆
D
3. Calculate the sum of the length and width deviation
∆
A +
∆
B +
∆
C +
∆
D
4. Calculate the percent deviation of the length, width, and length combined with
width, by multiplying their deviations by 100, and dividing the results by the SID,
97 cm, or 38.2 inches. Write the results in the box below.
Image Intensifier Format
Zoom Format
If deviations are greater than 3.2%, adjust the control system or collimator align-
ment until a deviation of less than 3.2% is achieved.
Length deviation ________ cm __________% < 2.4%
Width deviation ________ cm __________% < 2.4%
width deviation ________ cm __________% < 3.2%
Length deviation ________ cm __________% < 2.4%
Width deviation ________ cm __________% < 2.4%
width deviation ________ cm __________% < 3.2%