ACR Electronics L-32 FIELD MARKER LIGHTING SYSTEM Informações Técnicas descarregar pdf (Página 15)

Three different

test

methods which require no

special instrumentation are described below.

Test Method I

Place the collimator in automatic mode.

Center a small cassette, 18 x 24 cm

(8 x 10"), in the cassette tray.

3) Center a larger cassette on the table top.

Make an exposure.

Process the film.

If the x-ray field

size exceeds the film size in the cassette

tray, use triangulation and the radiograph

from the table top to determine the actual

x-ray field size at the cassette tray.

Repeat steps 2-5 with the cassettes rotated

90 degrees in the cassette tray and on the

table top.

Repeat steps 2-6 with a larger cassette in

the cassette tray.

Test Method II

Place the collimator in automatic mode.

Center a small cassette 18 x 24 cm (8 x 10")

in the cassette tray.

3) Disable the automatic PBL feature.

4) Remove the small cassette and place a

larger cassette with film in the cassette

tray.

5) Make an exposure and measure the x-ray

field size on the film.

6) Repeat steps l-5 with the two cassettes

rotated 90 degrees in the cassette tray.

Repeat steps

-6 with a larger cassette'

7) 30 x 35 cm (11 x 14") in cassette tray

initially.

Test Method III

Since the Numerical Indicator accuracy was verified

in I-6-A-C, these indicators can be used to verify PBL

sizing.

1) Place the collimator in automatic mode.

Center a small cassette, 18 x 24 cm (8 x 10"))

in the cassette tray.

Record the dimensions of the x-ray field

from the numerical indicators.

Repeat steps l-3 with cassette rotated 90

degrees in the cassette tray.

Repeat steps l-4 with a larger cassette, 30 x

35 cm (11 x 14") in the cassette tray.

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 60 61

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