Radiation treatments have been attracted many interests as one of revolutionary cancer therapies. Today, it is possible to treat cancers without any surgical operations. In the fields of the radiation treatments, it is important to regist the 3D position of the cancer inside the body precisely and instantaneously. To achieve 3D position registrations, we aim at developing a compact camera for 3D measurements. In this trial, we have developed a high-speed pattern projector based on the spatiotemporal conversion technique. In experiments, we show some experimental results for the 3D registrations.
It is one of the important necessities to precisely measure the inner diameter and/or the inner profile of pipes, tubes and
other objects similar in shape. Especially in mechanical engineering field, there are many requests from automobile
industry because the inner surface of engine blocks and other die casts are strongly required to be inspected and
measured by non-contact methods (not by the naked eyes inspection using a borescope). If the inner diameter is large
enough like water pipes or drain pipes, complicated and large equipment may be applicable. However, small pipes with a
diameter ranging from 10mm to 100mm are difficult to be inspected by such a large instrument as is used for sewers
inspection. And we have proposed an instrument which has no moving elements such as a rotating mirror or a prism for
scanning a beam. Our measurement method is based on optical sectioning using triangulation. This optically sectioned
profile of an inner wall of pipe-like objects is analyzed to produce numerical data of inner diameter or profile. Here, we
report recent development of the principle and applications of the optical instrument with a simple and compact
configuration. In addition to profile measurement, we found flaws and defects on the inner wall were also detected by
using the similar principle. Up to now, we have developed probes with the diameter of 8mm to 25mm for small size
objects and another probe (80 mm in diameter) for such a larger container with the dimensional size of 600mm.