QDR
4500 Technical Manual
4-34
2.
Place the phantom on the table and set it up using the AP/Lateral setup as follows: press
S for Scan, then L for AP/Lateral, then choose 1 for
(1) AP SETUP
.
3.
Press and hold Enable until the arm and table move into position.
Note:
Do not move the arm or table, otherwise the test will have to be started over.
4.
When the laser comes on, place the phantom so that the laser dot is on the centerline of
the phantom, 1/2" from the left end, shining on the phantom target. The sides of the
phantom should be aligned parallel to the table, using a ruler if necessary.
5.
The AP/Lateral menu should now appear on the screen.
6.
Choose 2 for
(2) AP SCAN
, then A for array spine.
7.
Change the scan length to 6 inches (15.25cm for metric units), and Press <F10> to
begin the scan.
8.
When the scan has finished, analyze it following the standard AP scan analysis routine
(i.e., analyze L1 through L4).
9.
At the conclusion of the regular analysis, the scan will reappear on the screen along with
two red lines and a dashed centerline. The vertebrae
must
be centered and completely
contained between the two red lines. The angle (shown in degrees) directly below the
scan indicates the misalignment of the spine phantom and it
must
be between
±
2
degrees. If the angle is greater than this, start the test over (from Step 4), using a ruler if
necessary to correctly align the phantom.
10.
If the angle of the phantom is less than
±
2 degrees, press <End>. A blue arrow will
now appear near the bottom of the screen, indicating where the lateral scan is to begin.
11.
Press <End>. The final AP analysis report will now appear on the screen.
12.
Press <Esc>. The AP/Lateral menu will now appear on the screen.
13.
Choose 3 for
(3) LAT SETUP
.
14.
Press and hold Enable until the arm and table move into position.
15.
Choose 4 for
(4) LAT SCAN
, then press <F> for fast array, and then press <F10> to
start.
16.
Choose 5 (Return to AP), and press enable.
17.
Choose 6 (Analyze Lateral Scan).
Note:
Only L2 through L4 will be analyzed in lateral scans.
18.
Set the Global Region of Interest (ROI):
The scan will appear with a global ROI determined by the ROI used in the AP scan analysis.
Press "T" (to select the top of the ROI) and using the
←
and
→
keys, make the sides of the
ROI box vertical.
19.
Press <Insert> (to select entire ROI box) and use the
←
and
→
keys to position the box
so that the middle line (the "bisecting" line) is 2 lines to the left of the edges of the
vertebral bodies, separating them from the posterior elements of the spine phantom.
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