Hologic DISCOVERY C - Page 117

Discovery QDR Series Technical Manual
3-65
Each service engineer has been provided with an 11-step aluminum phantom (Step Wedge
Penetrometer, P/N 099-0716) for checking image contrast and a line-pair phantom (X-ray
Test Pattern, P/N 099-0715) for verifying scan resolution.
Checking the quality of the IVA scans requires three scans:
• single-energy AP
• single-energy lateral
• dual-energy AP
To perform an IVA scan QC, do the following:
1. Press the Center Table button to center the table.
2. Press the Laser button to turn the laser ON. If the laser goes off during the align-
ment process just press the Laser button again to turn the laser ON.
3. Place the x-ray Step Wedge Phantom (P/N 099-0716) on the table approximately
an inch to the right of the crosshair. Center the laser line approximately through
the center of the Step Wedge.
4. The Step Wedge Phantom should be placed with its thickest end to the left (foot
end) and its thinnest end on the right with its edges parallel to the table.
5. Skip steps 6 through 8 for Models Ci and Wi.
6. The X-ray Test Pattern Phantom (P/N 099-0715) should be aligned approxi-
mately an inch to the right of the Step Wedge Phantom.
7. The x-ray test pattern should be placed on the table with the lines the Test Pattern
Phantom perpendicular to the motion of the C-arm during scanning. The laser
line should pass through the center of the x-ray Test Pattern Phantom. The 1.8
and 0.6 test patterns should be farthest from the Step Wedge Phantom. The 0.6
test pattern should be nearest to the front of the table.
8. Depress the Laser button on the C-Arm to turn OFF the laser.
9. Click the Perform Exam button at the Discovery Main Screen.
10. Select the IVA Test as the patient. If this name is not present, then click the New
patient button. Enter IVA Test as the new patient last name. Leave the first
name and initials blank and then click the OK button.
11. Click the name IVA Test from the patient names. Click the OK button.
12. In Patient Confirmation Screen, click the OK button.
13. At the Select Scan Type screen, select IVA Imaging.
14. Uncheck the Use default scan mode check box and then click the Next>> but-
ton.
15. Select SE AP Image then click the Next>> button.
16. Select None then click the Next>> button.
17. From the Scan Parameters screen set the scan length to 10.0 inches.