Specifications

2. Center the film cassette in the cassette tray and insert into position.
3. Adjust the field size to 15 by 15 centimeters or 8 by 8 inches by means of
the numerical indicators on the beam-limiting device.
4. Make an exposure and develop film.
5. Measure and record the length and width dimensions of the image.
D. VERIFICATION OF COMPLIANCE
The deviation of any of the recorded dimensions must not exceed 2 percent of
the SID in Step 1.
NEMA Standards 5-15-79
XR 8-2.20 X-RAY FIELD LIMITATION AND ALIGNMENT
REQUIREMENT
The X-Ray field size in the plane of the image receptor, whether automatically or
manually adjusted, shall be such that neither the length nor the width of the X-Ray field
differs from that of the image receptor by greater than 3 percent of the SID and that the
sum of the length and width differences without regard to sign be no greater than 4
percent of the SID, when the equipment indicates that the beam axis is perpendicular to
the plane of the image receptor (see 21 CFR 1020.31 (e) (2) (ii) ).
.01 METHOD 1 - BRH/FDA TEST STAND METHOD
A. EQUIPMENT
1. BRH/FDA compliance test stand with accessories
2. Slide assembly
3. Plastic cassette containing a sheet of direct print paper or X-Ray film
4. Ruler
5. Cassette (preferably 20 to 25 cm or smaller).
November 2005 ( 5 - 18) Linear MC150-C Collimator
B. PROCEDURE
1. Using the means provided, align the source assembly so that the beam
axis is perpendicular to the image receptor.
2. Place the test stand on the table.
3. Position the spacer so that it does not intersect the primary beam and
secure with the pushbutton connectors.