Sonomed E-Z Scan AB5500 Plus, Руководство оператора

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Section 3 A-Scan Operation and Use
3 - 1
The A-Scan mode of the EZ-S
CAN

allows for measuring of the axial length (AXL)
of an eye and calculating the associated IOL
power for an implanted lens.
By placing the A-probe against a patient eye,
and aligning the probe along the visual axis, a
live A-Scan ultrasound pattern for an AXL
measurement can be obtained. The image can
then be “frozen” and the measured value for the
AXL will be displayed along with other
pertinent information. Using the AXL,
Keratometer readings, and an IOL program
parameter (depending on the specific program
selected), the system calculates the required IOL
power.
After completion of measurements and
calculations, a hardcopy may be obtained of the
results using the video printer included with the
system. The hardcopy will include all
information that is displayed on the screen when
the print key is depressed.
1.
Touch the [ A-SCAN ] key on the Main
Screen (see Figure 3-1).
Figure 3-1 Main Screen Display
2.
Ensure the Calibration Screen appears.
It is recommended that the functionality of the
A-scan portion of the EZ-S
CAN

be verified by
means of the calibration procedure prior to
performing actual measurements.
The EZ-S
CAN

defaults into the Calibration
Screen when the A-Scan mode is selected.
To perform the calibration procedure, follow
these steps:
1. Place a small amount of ultrasound
transmission gel onto the calibration
cylinder which is located on the A-probe
holder assembly.
2. Place the probe onto the calibration cylinder.
The probe should be placed perpendicular to
the cylinder. Press the footswitch or the
[FREEZE] key.
3. Observe the measurement displayed in the
upper left corner of the display. The
measurement will freeze once it has
captured a satisfactory pattern and
measurement.
4. Verify that the measurement obtained is
10.00
±
0.1 mm.
Note: If necessary, the gain control may be
adjusted by turning the “Gain” knob located to
the right of the display. The resulting gain level
in “dB” (decibels) will be displayed.
IMPORTANT
If a measure within 10.00 ± 0.1 mm cannot be
obtained, contact Sonomed service department
for assistance
.
3.1
SELECTING A-SCAN MODE
Section 3
A-SCAN OPERATION AND CLINICAL USE
(For E-Z Scan Model Only)
3.2
CALIBRATION
!