Holography of 3D Surface Reconstructed CT Images

Fujioka, Masashi; Ohyama, Nagaaki; Honda, Takao; Tsujiuchi, Jumpei; Suzuki, Masane; Hashimoto, S; Ikeda, Shigeto

doi:10.1097/00004728-198801000-00041

Cited by 11 publications

(3 citation statements)

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“…Microscopy, utilizing laser scanning techniques, is also amenable to tomography and three-dimensional reconstruction (135). Three dimensional images of CAT scans and MRI images and even fossil cephalopods can be recorded on holographs with sufficient accuracy for measurement of object relationships (136)(137)(138). Physical models, accurate in three-dimensions, can even be computer-generated (139).…”

Section: Three-dimensional Imagingmentioning

confidence: 99%

Contributions of paleorheumatology to understanding contemporary disease

Rothschild

2011

Reumatismo

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Accuracy of paleontologic perspectives, understanding disease states, hypothesis formation, and technology form the basis for this review. Moodie's (1) effort, in isolation, to attribute diagnoses to paleontologic observations were originally met with skepticism (Don Baird, personal and graphic communication) and have not stood the test of time (2, 3). Familarization with the technology should allow innovative approaches to mainstream paleontologic questions. Collaborative efforts should allow avoidance of some of the pitfalls of that technology. When all parties to such collaboration must convince each other of the appropriateness of their "pronouncements," confidence is generated in the conclusions..

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Section: Three-dimensional Imagingmentioning

confidence: 99%

Contributions of paleorheumatology to understanding contemporary disease

Rothschild

2011

Reumatismo

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Section: Hologram Of Medical Objectsmentioning

confidence: 99%

“…A series of projected images are calculated onto planes around the body axis, displayed frame by frame on a CRT screen, and recorded on a movie film for using as an original film for synthesizing HS. MH of skull of a living patient is successfully synthesized by using this method [8,9].In stead of using a movie film for providing original images in a hologram synthesizer, a spatial light modulator such as a liquid crystal TV screen can be used as an interface between computer and hologram synthesizer. A preliminary experiment is carried out, and fairly good images are obtained by using such an equipment [10].…”

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confidence: 99%

Medical applications of holographic stereograms

Tsujiuchi

1991

SPIE Proceedings

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A method for displaying 3D images of medical objects by using holographic stereogram is described together with basic properties of reconstructed images of cylindrical holographic stereograms. INTRODUCTI ONA holographic stereogram (HS) is a synthesized hologram from an original film which consists of a series of ordinary photographs taken from different directions of an object, and is possible to apply to an object whose hologram is very difficult or impossible to take with conventional techniques [U. Such a feature of HS can be used for 3D display of medical images such as X-ray images, computer assisted tomogrphy (CT) images, nuclear magnetic reasonance images (MRI) or ultrasonic images of a patient. CYLINDRICAL HOLOGRAPHI C STEREOGRAMSThe original film of the medical HS is taken by rotating around the body axis of a patient a U-shaped arm equipment, one end of which has a pulse X-ray source and the other end a movie camera with an image intensifier [2]. Synthesis of HS is carried out by using a special optical system, the hologram is shaped into a cylinder, and is reconstructed by illuminating the hologram with a small white light source located on the axis of the cylinder. Such a HS is called multiplex hologram (MH), the most popular HS, and the reconstructed image can be observed in the cylinder. The formation of reconstructed image is made in unusual way, and fundamental properties of reconstructed images of MH are studied mainly for distortion and resolution, and optimum conditions for minimizing the distortion are made clear [3,4]. Computer processing in the original images to make distortion-free reconstructed images is also proposed [5]. Resolution of reconstructed images is mainly due to the size of the reconstructing source if the original image has enough resolution, and an optimum source size for reconstructing MH is suggested [6]. 398 / SPIE Vol. 1238 Three-Dimensional Holography: Science, Culture, Education (1989) Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/25/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx HOLOGRAM OF MEDICAL OBJECTSIn general, X-ray images in medical use are of low contrast, and high quality reconstructed images from these original images cannot be expected. Computer processing of original images is employed to improve the quality of images, and this system brings the possibility of expanding kinds of medical images to synthesize HS [7]. A set of CT images are used for synthesizing HS of bones. CT images give sectional images of a patient perpendicularly to the body axis. Computer processing is applied to extract bones from the tomograms, and to reconstruct surface reconstruction images of the bone by piling up these sectional images with the aid of interpolation technique. A series of projected images are calculated onto planes around the body axis, displayed frame by frame on a CRT screen, and recorded on a movie film for using as an original film for synthesizing HS. MH of skull of a living patient is successfully synthesized by usin...

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Holographic reconstruction of NMR images in Fresnel transform technique

Yamada

Ito

Tanaka

1990

Electron Comm Jpn Pt II

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Since the signal obtained in the NMR Fresnel transform technique is given by an equation similar to that of the Fresnel diffraction equation in light, a technique in which the NMR signal in the Fresnel transform technique is recorded on a transparent film as a hologram and an image is reconstructed from such a hologram by using coherent laser light. Theoretical and experimental studies on such a technique are made in conjunction with the comparison between this technique and another technique in which the hologram is made from the NMR signal in the conventional Fourier imaging technique. The experiments show that considerably good quality images are reconstructed from the holograms in 16 shades of gray made from the signals in the NMR Fresnel transform technique since the dynamic range of the signal in this technique is small. This results in a quantization of the signal with little loss of the information, and the fringe pattern of the hologram is distributed widely over the hologram plane. The experiments show also that it is difficult to reconstruct good quality images from the holograms in 16 shades of gray made from the signals in the NMR Fourier transform technique. This is because most of the information of the image is lost by a quantization of the signal in such a small number of shades of gray since the dynamic range of the signal in the NMR Fourier transform technique is extremely large. It is shown also that the dynamic range of the signal can be decreased using a quadratic nonlinear field gradient in the pulse sequence in the NMR Fourier transform technique, and great improvement in the quality of the optically reconstructed image is obtained.

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Holography of 3D Surface Reconstructed CT Images

Cited by 11 publications

References 0 publications

Contributions of paleorheumatology to understanding contemporary disease

Contributions of paleorheumatology to understanding contemporary disease

Medical applications of holographic stereograms

Holographic reconstruction of NMR images in Fresnel transform technique

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