Showing papers on "Imaging technology published in 1996"

Chemistry is right for T-ray imaging

Abstract: What do you get if you combine very high frequency microwaves, real-time imaging, submillimeter spatial resolution, and chemical sensitivity? The answer is Terahertz, or "T"-ray, imaging. This novel imaging technology operates in the submillimeterwave region of the electro-magnetic spectrum, a portion of the spectrum that was previously hard to access using conventional technologies. But recent advances in high-speed optoelectronic and femtosecond laser technology facilitate generation and detection of short bursts of terahertz radiation, which have proven to be extremely useful for spectroscopic measurements in the submillimeter-wave range. T-ray imaging combines these spectroscopic measurements with real-time imaging and advanced signal processing and recognition, so that each pixel element of the image contains spectroscopic information about the object. In many cases, the spectroscopic information gives us significant clues about the chemical composition of the object of interest.

Aircraft corrosion and crack inspection using advanced magneto-optic imaging technology

Abstract: A next generation magneto-optic imaging system, the MOI 303, has recently been introduced with the ability to generate real-time, complete, 2D eddy current images of cracks and corrosion in aircraft. The new imaging system described features advanced, digital remote control operation and on- screen display of setup parameters for ease of use. This instrument gives the inspector the capability to more rapidly scan large surfaces areas. The magneto-optic/eddy current imaging technology has already been formally approved for inspection of surface cracking on an aircraft fuselage. The improved magneto-optic imager is now poised to aid rapid inspection for corrosion and subsurface cracking. Previous magneto-optic imaging systems required the inspector to scan the surface twice for complete inspection coverage: a second scan was necessary with the imager rotated about 90 degrees from the orientation of the first pass. However, by providing eddy current excitation simultaneously from two orthogonal directions, complete, filled-in magneto-optic images are now generated regardless of the orientation of the imager. THese images are considerably easier to interpret and evaluate. In addition, there is a synergism obtained in applying eddy current excitation simultaneously in multiple directions: better penetration is obtained and the resulting images have better signal to noise levels compared to those produced with eddy current excitation applied only in one direction. Examples of these improved images are presented.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Low-Field MR Imaging — Development in Finland

Abstract: The development project for application of MR imaging to diagnosis of internal hemorrhages was initiated by the Instrumentarium Corporation in 1978. The goal was to develop a diagnostic tool for emergency clinics. Due to the rapid development of imaging technology, the goal was changed to a cost-effective MR unit.During the past 16 years, several generations of low-field units have been introduced. Consequently, a vast amount of clinical and technical knowledge about low-field MR has been gained.The interest in low-field units is rapidly increasing. A part of this may be explained by the pressure to reduce the cost of health care. There are some features which make the low-field approach clinically interesting. These include the feasibility of open magnet configurations, and the availability of unique contrast parameters such as magnetization transfer and T1ρ. One important aspect is the inherent safety of a low-field MR unit.This article reviews the methods and devices introduced through the development ...

Future of imaging technology

Abstract: Measurements and/or controls are normally made at one point in a wide area or space by making the assumption that conditions in the area or space are uniform, in spite of the fact that phenomena in the natural and artificial words are actually distributed. It is very desirable that distributed phenomena are measured just as they are, and because of the progress in large-scale integration (LSI) and micromachining technologies, measurements of phenomena of plural dimensions are being realized: not a point, but a line, area, space, space plus time and N dimensions. A new concept for such multi-dimensional measurements is proposed by the author as ‘imaging technology’, and it is classified into three groups: pattern imaging, tomographic imaging and microscopic imaging. Pattern imaging consists of images made from the outputs of plural sensors. Tomographic imaging is where images are made with the technology of computed tomography. In microscopic imaging images of very small size are enlarged with microscopic methods. Several examples for each type of imaging are given.

Electro-optical technology for remote chemical detection and identification III : 13 April 1998, Orlando, Florida

Abstract: These conference papers include coverage of active/passive detection technology, and signal processing and imaging technology.

Clinical imaging in psychiatry

Abstract: Brain imaging has made surprisingly remarkable progress since the early, and now historic days, of invasive radiology, which has now been replaced with a number of spectacularly precise techniques: structural (CT Scan, MRI) and functional (PET, SPECT) imaging, direct imaging during neurosurgery, EEG and its computer-assisted derivatives, and transcerebral ultrasonography. We present five cases with two alleged autisms, a cerebral malaria, a panic disorder and to Parkinson disease with a depressive component. Using modern imaging methods the following respective diagnoses were arrived at: a left temporal cyst, a Sanfilippo mucopolysaccharidosis, a septum lucidum agenesis, a right temporal cyst, and a pituitary adenoma. These cases illustrate the scientific, emotional and philosophical impact, on physicians, and patients alike, of modern imaging technology. Neuroradiology, biochemistry and surgical imaging require a multi disciplinary approach and a perfect knowledge of psychiatric semeiology. In addition, they stimulate us to carefully reassess our sociocultural understanding to mental illness.

Digital Imaging of Papyry

Abstract: This project, conducted under contract to the Commission on Preservation and Access, set about to document how to best scan papyri in anticipation of a major effort among papyrologists to digitize their collections. The report was prepared with the assistance of participants in the Advanced Papyrological Information System (APIS) and other expert consultants after a meeting in Ann Arbor, Ml, in March 1995. APIS is an interinstitutional project growing out of a committee established in early 1994 by the American Society of Papyrologists to study imaging and other current technological developments and establish standards for the field. The investigations have resulted in agreement on best practices for the capture and storage of digitized images for papyri that will be employed in the APIS effort to help ensure the usefulness of the created images for teaching and research.