(b) Select the two-on-one transverse format and make two radiographic
exposures. Develop the film and measure the exposed areas. The dimensions of each
exposed area should be between 4.625 inches x 9.25 inches and 4.5 inches x 9.0
inches with no more than 3/16-inch gap or overlap between the images. If it is not,
adjust the "HALF" potentiometer, R15, on the SFD interface board to increase or
decrease the exposed area as required.
NOTE:
Adjusting R15 will also change the size of the images obtained on the two on
one ongitudinal format setting. Compare the two films before making this
adjustment.
(c) Repeat this procedure if adjustment is required until the exposed
areas are within the limits described in (6)(b) above.
Three-on-one film adjustment.
(7)
(a) With the SFD at minimum SID and the radiographic mode selected
on the generator, insert an unexposed film cassette and advance it to the "park"
position. The collimator blades should be adjusted to their maximum open position.
(b) Select the three-on-one format and make three radiographic exposures.
Develop the film and measure the exposed areas. The dimensions of each exposure
should be between 9.25 inches x 3.125 inches and 9.00 inches x 2.875 inches with no
more than 3/16-inch gap or overlap between the images. If it is not, adjust the "1/3"
potentiometer, R16, on the SFD interface board to increase or decrease the exposed
area as required.
(c) Repeat this procedure until the exposed areas are within the limits
described in paragraph (7)(b) immediately above.
(8)
Four-on-one film adjustment.
(a) With the SFD at minimum SID and the radiographic mode selected
at the generator, insert an unexposed film cassette and advance to the "park" position.
The collimator blades should be set to their maximum open position.
(b) Select the four-on-one format and make four radiographic exposures.
Develop the film and measure the exposed areas. The dimension of each exposed
area should be between 4.625 inches x 4.625 inches and 4.5 inches x 4.5 inches with
no more than 3/16-inch gap or overlap between the images. If necessary, adjust the
"HALF" potentiometer, R15, a small amount to increase or decrease the size of the
image.
NOTE:
Adjusting R15 will have an effect on the image size obtained with the two-on-one
longitudinal and two-on-one transverse formats. Compare the images obtained
with those formats before making this adjustment.
MD0351
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