Internal structure visualization by terahertz computed tomography with carbon nanotube photo-scanner toward multi-frequency image reconstruction

Conventional computed tomography (CT) examinations utilize X-rays, which are extremely invasive to the examined object. There is a demand for visualizing the inner structure of the object in a non-destructive and non-invasive way. This paper introduces CT measurement technology in the terahertz (THz) band, which is less invasive and thus gives less damage to the object. In particular, we propose a CT measurement technique using a carbon nanotube (CNT) film as a sensor, which can restore multi-frequency images due to the broadband absorption properties of the CNT film. Our proposing CT measurement technique using THz waves can be widely applied to industrial and medical fields.