FujiFilm VisualSonics Vevo F2 User Manual page 190

Note: For more information about measurements, refer to Measurements on
page 61.
Laser Calibration
Before using the laser, make sure it is properly calibrated.
Laser calibration characterizes the transmission efficiency of the Vevo Optical Fiber across the entire
wavelength spectrum. It is a very important step to ensure that multi-wavelength data is normalized to the
same energy scale.
When calibrating the l aser, be aware of the following:
The date and time the laser was last calibrated, and the user who performed the calibration, are
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recorded and displayed on the Laser Configuration panel.
Items Required
The following items are required to calibrate the laser:
The Vevo LAZR-X laser cart
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External energy sensor
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A transducer compatible with PA-Mode, equipped with a Vevo Fiber Jacket and a Vevo Optical
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Fiber.
A transducer holder, such as the one on the Vevo Rail System.
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An imaging platform or another flat, slightly elevated surface
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Ultrasound gel
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Ultrasound cleaning products
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To Calibrate the Laser
1. Connect the transducer to the Vevo F2 Imaging System.
2. Connect the Vevo Optical Fiber to the laser.
3. Connect the external energy sensor to the external power meter on the front of the laser.
4. Place the external energy sensor on the base of an imaging platform, or on a flat, slightly elevated
surface.
5. Using a damp cloth, clean the transducer and the output ends of the optical fibers attached to the
Vevo Fiber Jacket. Ensure that there is no residue or dirt on the Vevo Fiber Jacket or the output ends
of the optical fibers.
6. If calibrating for the 680 - 970 wavelength range, apply ultrasound gel to the transducer. Ensure the
ultrasound gel completely covers the output ends of the optical fibers.
Calibrating with gel is best for the 680 - 970 nm wavelength range because it compensates for the
way the laser attenuates at longer wavelengths due to water absorption.
If calibrating for the 1200 - 2000 nm wavelength range, do not apply gel to the transducer.
Modes
Vevo F2 Imaging System User Manual
190