In this paper, we propose a haptic device which displays the virtual inner volume inside using angular moment. The device is developed using a linear motion guide, a weight and a motor which can control the height of the center of the gravity. Also, psychophysical experiment was carried out to evaluate our device. By conducting a regression analysis on the result of the experiment, there was a significant effect on user perception of the inner volume. Based on the result, we created several applications with our proposed method to show the usage.

This paper introduces a registration and projection method for directly projecting the tumor region for breast cancer surgery assistance based on the breast procedure of our collaborating doctor. We investigated the steps of the breast cancer procedure of our collaborating doctor and how it can be applied for tumor region projection. We propose a novel way of MRI acquisition so we may correlate the MRI coordinates to the patient in the real world. By calculating the transformation matrix from the MRI coordinates and the coordinates from the markers that is on the patient, we are able to register the acquired MRI data to the patient. Our registration and presentation method of the tumor region was then evaluated by medical doctors.

In this paper we propose an augmented reality system that superimposes MRI onto the patient model. We use a half-silvered mirror and a handheld device to superimpose the MRI onto the patient model. By tracking the coordinates of the patient model and the handheld device using optical markers, we are able to transform the images to the correlated position. Voxel data of the MRI are made so that the user is able to view the MRI from many different angles.