Viewing images of the inside of the body in 3D allows for more intuitive manipulation. Imagine, for example, looking into the lungs. Let’s start with an endoscope. When looking at the trachea through an endoscope, you can see the trachea beyond the endoscope, but you may not know exactly how much further you need to extend it in the endoscope image. This is because the depth of the trachea cannot be seen clearly in 2D image. By using a 3D monitor to view the endoscopic image, the depth of the endoscope can be clearly seen. This improves the operability of the endoscope. Also, by showing the images to beginners, it can be useful to improve their learning. Let’s say that the image is viewed with an x-ray. By using a 3D monitor, it is difficult to determine whether the catheter is bent toward the front or the back of the lesion, but by using a 3D monitor, it is possible to get a sense of depth. By using a 3D monitor, you can see where the catheter is in front of, behind, or in the center of the lesion.