QDR
®
4500 Technical Manual
3-28
If… Then…
the Standard Deviation (SD) for both High Air
(HiA) and Low Air (LoA) is less than or equal to
14,
the coefficient of variation for absolute radiation
is less than 4%.
To do this:
1.
Perform 10 spine scans using AUTOSCAN (if not already done so).
2.
Analyze the 10 scans (using AUTOCOMP).
3.
Put the results in the QC database (if you have not already done so).
4.
At the Hologic Main Menu, select “QC”.
5.
Select “Database”.
6.
Press <Alt><F1>.
7.
At the displayed dialog box, select all parameters (type Y<Enter>).
8.
Select “Plot”.
9.
Select “HiA”.
10.
Plot the data for the 10 scans in step 1.
11.
Assure that the SD is 14 or less.
12.
Repeat for “LoA” by repeating steps 9-11. This result must also be 14 or less.
Note:
Enter this information into
The Radiation Measurement Report
(see page 3-28).
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