Masane Suzuki

Holography of 3d Surface Reconstructed Ct Images

A multiplex hologram (cylindrical holographic stereogram) was successfully made from three-dimensional (3D) surface reconstruction CT images of a child with plagiocephaly. This method appears to be suitable as one of the projectional aids of 3D surface reconstruction CT images that are proving useful in plastic and reconstructive surgery. The principle of the method is described. Also discussed is the possibility of developing a computer-aided hologram synthesizing system that could be used for images obtained with U-arm X-ray equipment (by either cinefilm, or videotape, or digital subtraction angiography) or by CT as well as MR. For practical use, it is necessary for the hologram to be synthesized in a short time. One of the key problems in developing such a machine is the need for an incoherent-to-coherent image converter.

Moiré topography using developed recording methods

Abstract Where moire topography is used to record the shape of objects of approximately cylindrical form or that of a series of such objects, a scanning method with a slit camera can be employed. One such method takes photographs by combining conventional shadow type and projection type moire topography with a slit camera. Laser methods of line projection combined with a scanning method developed from the projection type of moire topography are also utilised. The main features of the latter method are that it is not affected by any diffraction effect caused by the grid and that highly accurate recording can be achieved with excellent image quality using the properties of the laser beam. Another distinct advantage is that it is capable of recording the shape of a self-luminous object without contacting by selection of laser wavelenghts and matching optical filters. The laser scanning method can therefore be considered to have considerable potential for future applications.

Development of automatic hologram synthesizer for medical use II: hologram synthesizing machine and viewer

Hologram synthesizing machine as a key component of the automatic hologram synthesizer is developed. Hologram synthesizing machine creates cylindrical multiplex holograms with 400 mm diameter from images displayed on liquid crystal SLM or images on 35 mm cine film. The machine consists of a main body, a controller, and a film processing machine, and performs synthesis and chemical processing of hologram automatically within 4 hours. A viewer which reconstructs original images from a synthesized hologram is also developed. In addition to reconstruction of images, the viewer also can point and measure images.

Holographic Viewing Of Neuroradiograms--An Attempt Of A New Method For 3-Dimensional And Dynamic Observation

Technique of holography is applied for 3-Dimensional and dynamic viewing of serial roentgenograms with special emphansis on total display of serial neuroradiograms and computerized tomograms (CT Scan). Although holographic stereogram is at present no better than conventional stereoscopic technique, our multi-tomogram holography appears to provide 3-Dimensional viewing of CT Scan images which is based upon new principle.

Fringe Analyzer For A Fizeau Interferometer

We have developed a new computerized measuring system for interferometric testing of lenses and mirrors. A personal computer with an image processor controls a laser interferometer, stores interferograms, derives the wavefront shape, and evaluates such imaging performances of optical components as the Seidel and the Zernike aberration coefficients, the peak to valley(P-V), the root mean square(RNS) values of wavefront aberration, the spot diagrams, PSF, and MTF.

A DYNAMIC AND STEREOGRAPHIC VISUALIZATION OF A MOLECULE BY THE TECHNIQUES OF MOLECULAR DYNAMICS SIMULATIONS, COMPUTER GRAPHICS, AND MULTIPLEX HOLOGRAPHY

In order to develop a novel visualization method for a “moving” molecule, the technique of multiplex holography was combined with the computer graphics obtained by the aid of molecular dynamics simulations.

Oblique Incidence Interferometer Using Holographic Optical Elements

Optical elements made by holographic technology are called Holographic Optical Elements (HOEs). HOEs have some advantages as conventional optical elements are not equipped and have been applied in various optical devices. We have applied HOEs, a pair of holographic gratings and a holographic lens, in an oblique incidence interferometer. In following lines we call it OII as Oblique Incidence Interferometer.

DEVELOPMENT OF VARIABLE BEAM DIRECTION LASER HANDPIECE AND VARIABLE BEAM ANGLE LASER HANDPIECE

Conventional laser handpieces for medical laser equipment have some practical problems when used for treatment in such narrow fields of operation as body cavities. One of the greatest problems is that the location of the target for the laser is limited to some restricted parts of the surface of the subject region because of the fixed direction of the laser beam shot out from the laser handpieces. Another major problem is the difficulty of controling the field of laser exposure because a focul lens of a single focal length is used. The authors have developed two kinds of new laser handpieces with unigue functions as follows: one is a variable beam direction laser handpiece using a rotary reflector and another is a variable beam angle laser handpiece, both of which are extremely useful in laser surgery.

Three-dimensional holographic display of images of otological specimens.

Three-dimensional displays of anatomical structures and clinical findings are very persuasive and instructive. Using multiplex holograms, we designed a display of three-dimensional images of otological specimens. Multiplex holograms, reported by Cross of the United States in 1975, enable reconstruction of three-dimensional moving images and are used for artistic display as well as for teaching in medicine and general education. Multiplex holograms were recorded in a two-step process. The first step is to make a series of original cine-pictures of an object from different horizontal directions, rotating it on a turntable. In the second step, one frame of the original film is recorded on a narrow strip hologram. All frames of the original film are recorded one after another and a complete multiplex hologram can be synthesized. In the reconstruction stage, the multiplex hologram is formed into a cylinder and illuminated from below by a small white light source. Reconstructions of the three-dimensional bright images of the object inside the cylindrical holographic screen are shown.