Siemens 25 Manual de serviço - Página 7

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Service Manual

Maintenance Instructions

8.8

Aligning the light field to the radiation field

Load a 24 Cm x 30 cm or 10" x12 " cassette

with film and place it on a table or base.

Using a tape measure, set a vertical SID of

100cm or 40" to the upper edge of the

cassette as shown.

Using slide flaps set a format of 18 cm x 24

cm or 8"x 10".

Switch on the Collimator Lamp and align the

cassette.

Attach

radio-opaque

markings

the

cassette. Attach a washer as lateral marking.

Trigger an exposure and develop the film .

Using a waterproof felt pen, write the following

data on the developed film

- set SID

-film size

-radiation field size

Measure the deviations between light field

edges and radiation field edges on all four sides

(X1,X2,Y1,Y2) as shown.

Determine the total deviations in the X and Y

direction ( ignore the +/- signs).

Both, length deviation (ΣY) and width deviation

(ΣX) must be ≤ 2.0 cm.

If the deviation is higher, loosen the 4 screws.

slightly and move the collimator accordingly as

shown. Then tighten the screws at the collimator

again.

Repeat the check and, if necessary, adjust the

collimator again until the deviation between the

light field and the radiation field is within the

tolerance (≤ 2 cm).

Siemens Ltd. Med India

Version 6.0

8-6