Hologic QDR 4500 - X-Ray Beam Alignment Airscan Test

QDR

4500 Technical Manual
4-30
X-RAY BEAM ALIGNMENT "AIRSCAN" TEST
This procedure verifies proper X-ray beam alignment (for 4500A and W only):
1. Type WBAIRQC in the Patient Biography. Enter the serial number of the unit in the
Patient ID field.
2. Perform one Whole Body
air
scan (a scan with nothing on the table) from the Hologic
main menu.
Make sure that only the pad is on the table. Clear the table of anything else. From the
main menu, select scan, then whole body, then press <F10>.
Note:
Do NOT interrupt the scan for any reason.
3. Exit to DOS. Insert the AIRSCAN.EXE test tool (part #099-0628) into the floppy drive.
4. At the DOS prompt, type GETSCAN<Enter>.
5. Select the Whole Body scan.
6. From the C:\MENU> prompt, type A:\AIRSCAN<Enter>
.
The monitor displays a screen similar to the following:
The example screen (above) shows that there were 2 lines (1) and 2 columns (3) with a standard
deviation (S.D.) of greater than 2.0 and that the global S.D. is 1.52 Keith units (Kth).
If the Global S.D. (2) is less than 2.0, the instrument is properly aligned
.
C:\MENU>airscan
Selected scan = \xcdata\PO98C09A.P0O
Total points per phase in row: 109
Total lines in column: 150
lowair lines with a standard deviation greater than 2.0
phase line mean stdev min max
1 0 584.16 2.06 581 598
1 1 584.17 2.08 581 599
Global Stats:
1 584.51 1.52 580 599
lowair columns with a standard deviation greater than 2.0
phase line mean stdev min max
1 0 584.73 3.54 580 599
1 108 583.74 2.38 581 593
\MENU>
(3)
(2)
(1)