EVA Pro - Capturing a clinically useful image

Clinically useful images are critical for remote consultation, patient documentation, and quality assurance purposes. There are several factors to consider to ensure high quality images.

Factors to consider to ensure high quality images:

Important: the colposcope should never come into physical contact with the patient.

Stability

The colposcope should be in a stable position while capturing an image. The unit can be stabilized by:

Using a stand: The colposcope can be attached to a provided stand. The height of the stand should be the same as the height of the examination table (standard medical table height is 80-110 cm/31.5-43.5 inch).
Hand-wave feature: Images can be captured without touching the screen, through the hand-wave feature. This enables the user to wave their hand in front of the proximity sensor above the visualization screen in order to capture an image.

Positioning

Distance: The device should be positioned at a distance of 18-40 cm / 7-15.7 inches from the patient’s cervix.

Angle: The entire face of the cervix should be captured in the image, without any obstruction by the speculum. The colposcope lens should be aimed directly at the patient's cervix.

Making sure the Cervix is properly framed is key to obtaining a good image.

The cervix should take up about 80-90 percent of the image.
The cervix should be in the center of the frame.

Why is this important?

When the cervix does not take up enough of the image, or is not centered, the image can be too bright or too dark.

What can we do to fix this?

Move the camera closer so the cervix takes up the majority of the image. The Speculum should not be visible.

Illumination

The cervix should be fully illuminated and without glare.
The LED light is powered by a rechargeable battery contained within the optical unit. The battery has charge capacity sufficient for approximately 4 hours of continual use.
The colposcope reduces glare with a polarizer, however glare from the speculum reflection is still possible. If this is the case, reposition the colposcope and/or the speculum until there is less glare.

Without light, there is no image. It is crucial to have enough light to capture a good image.

Why is this important?

A poorly lit image can result in noisy, grainy images. Images that are too dark are harder to evaluate properly.

What can we do to avoid this?

Move the camera closer. The EVA Pro uses lenses to help focus the LEDs on the cervix, however if the camera is not close enough to the patient, much of the light will not properly illuminate the cervix.

Focus

Adjust the distance between the colposcope and the patient. Once you have achieved use the manual focus knob to adjust your focus.

Focus is another critical part to capturing good images.

Why is this important?

When an image is out of focus it’ll appear blurry and the fine details of the cervix are lost.

What can we do to avoid blurry images?

We recommend turning the knob all the way to the left (clockwise) with each new patient and then moving the camera as close to the patient as possible.
Evaluate the focus by moving the camera further and closer to the patient, observe the sharpness of the area around the cervix os.
Use the manual focus knob to adjust your focus.
When you find the best focus capture your image.

After you have captured images, it is important to review the images to verify they are clinically useful.