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Operations & Maintenance Manual: Using the Instrument
PROCEDURE 2. VERIFY AIM & ACCURACY
After completing a scan, the BVI 3000 displays two volumes on the Aiming screen: the largest volume measured
and the current volume. The light area inside the target‑shaped Aiming icon represents the position of the
bladder relative to the scanhead.
Figure 8. Aiming Screen
DONE SCAN X
READY TO SCAN
CURRENT = 132ml
Greatest volume measured
Current volume result
Aiming icon
1. Verify that the aim was accurate by comparing the Aiming icon to the results in the following table.
Table 4. Aiming Icons
RESULT AIMING ICON DESCRIPTION
Accurate
The bladder image is centered on the crosshairs of the Aiming icon. This
indicates that the scanhead was properly aimed, and the bladder volume
measurement is accurate.
Off‑center
The bladder image is not centered on the crosshairs and overlaps one
side of the Aiming icon. This indicates that the bladder was outside the
scanhead's eld of vision. In such cases, the measured volume is lower
than the true bladder volume. The BVI 3000 recognizes this condition
and displays a greater than (>) symbol before the bladder volume
measurement. To achieve an accurate measurement, re‑aim the scanhead
toward the bladder image, and then repeat the scan.
Volume
too high
The bladder overlaps two sides of the Aiming icon. This indicates that
the bladder is too large to be fully contained within the scanhead’s eld
of vision. The instrument recognizes this condition and displays a greater
than (>) symbol before the bladder volume measurement. In such cases,
repositioning or re‑aiming the scanhead will do little to improve accuracy;
however, this situation arises almost exclusively in patients with very large
bladder volumes. At these high volumes, measurements are clinically useful
even if they underestimate the true bladder volume.
2. If the aim is accurate, repeat Step 11 through Step 12 of the Measure Bladder Volume procedure in order to
determine if you are collecting repeatable results. This helps ensure maximum accuracy.
Note: The instrument assumes that the largest volume measured is the true bladder volume, because
in most cases the largest volume is the most accurate. Exceptions occur when the scanhead is moved
during the scan or the incorrect gender was selected. In these situations, the largest volume measurement
may be higher than the actual bladder volume, and you should clear the Aiming screen before rescanning
the patient.
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