Specifications

Prior to performing this test, the magnification factor must be determined in
accordance with the X-ray/light field alignment test - Method III.
B. EQUIPMENT
1. Manufacturer’s recommended test stand
2. Cassette with film
C. PROCEDURE
1. Align the tube unit and image receptor and set SID to the value
determined in the actual versus indicated SID test.
2. Insert empty 20 by 25 cm cassette into bucky tray.
3. Position test stand in accordance with manufacturer’s instructions.
4. Load a second cassette and place in the designated position.
5. Select the proper technique factors, make an exposure, and develop film.
6. Measure the length and width of the X-Ray image on the film.
7. Multiply each measurement by the magnification factor previously
determined.
D. VERIFICATION OF COMPLIANCE
Verify that the X-Ray field size in the plane of the image receptor does not differ
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 is not greater than
4 percent of the SID.
NEMA Standards 5-15-79
November 2005 ( 5 - 20) Linear MC150-C Collimator
RECORD SHEET
This sheet is to be used by the assembler to assure that all points of compliance are covered.
It will also serve as a maintenance log.
HOSPITAL ______________________________________ ROOM # ___________________
DATE OF INSTALLATION _________________________ ASSEMBLER _______________
_______________________________________________ _______________
Requirement
Applicable
Paragraph
Installation
Date Date Date Date Date