What is the difference between a conventional capsule endoscope and Sayaka?
The current endoscopic capsules on the market all have the lens installed at either end of the capsule. There are a number of weak points with this current design. Since the capsule can only capture images within its field of view, full gastrointestinal viewing is near impossible. The following example helps to explain,
- Imagine being in a long dark tunnel with only small flashlight shining in front of you. It is easy to imagine that one can clearly see what is in front of their field of vision, but it is extremely difficult to see the actual sides of the tunnel. Logically, your attention should be focused on the walls where defects would be, but in actuality is limited to only what is in front of you. This is the similar situation for the currently designed endoscopic capsules in a gastrointestinal tract.
- Most current endoscopic capsules in use today, adopt a wide-angle lens oriented to and focused on the lateral surface where doctors are most concerned. But, a wide-angle lens has an intrinsic fault of distortion within that peripheral view. Consequently, this image must be corrected with the aid of software, but the final results are limited due to distortion while capturing.
The newly announced Sayaka has a lens on the lateral surface of the capsule instead of the front. This new design obtains clear-cut lateral images of the gastrointestinal wall while the inner capsule spins in the digestive tract. Therefore, the advantage of this lateral macro photography are clear-cut and high resolution images despite a low light environment. These images are recorded in 2 MB/mm2 pixel resolution which allows up to around 75-fold enhancement on a 17-inch monitor.