Results 311 to 320 of about 500,460 (335)
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Subtraction sialography: An improved and simplified technique
Oral Surgery, Oral Medicine, Oral Pathology, 1971Abstract A new method of subtraction sialography employing a serialographic cassette tunnel film changer is described. This method, which can be used in any x-ray department, offers high-quality radiographs with excellent detail.
Peter M. Shimkin, John S. Buchignani
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Registration techniques for image subtraction
Conference Proceedings '88., IEEE Southeastcon, 2003Image subtraction can be used to aid in detection of flaws in a manufactured product by subtracting the image of a perfect product from that of the sample under tests. For this technique to be successful, the two images must be precisely registered. Several registration techniques were applied to various images which had been subjected to translation ...
T.G. Cleaver, C.-L. Su
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A simple noise subtraction technique
Review of Scientific Instruments, 2004Measuring very low level signals at low frequency is a tedious task, because environmental noise increases in this frequency domain and it is very difficult to filter it efficiently. In order to counteract these major problems, we propose a simple and generic noise subtraction technique, which mixes several features of traditional feedback techniques ...
Artyom Petrosyan +3 more
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THE SUBTRACTION TECHNIQUE OF THERMOLUMINESCENT DATING
Archaeometry, 1973ABSTRACTSCombination of the routine approaches of thermoluminescence dating, the fine‐grain and inclusion methods, allows an age to be determined that is independent of knowledge of the environmental dose‐rate. This socalled subtraction technique is exampled by several terracottas of museum origin and some pottery collected from archaeological contexts
S. J. Fleming, D. Stoneham
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Stereoscopic technique in digital subtraction angiography.
Radiology, 1985Stereoscopic technique was applied to digital subtraction angiography (DSA) with alternate exposures from twin focus spots (6.5-cm separation) of an x-ray tube. Correct identification of two crossed aluminum wires was obtained more than 90% of the time when there was separation of more than 5 mm.
M Miyawaki +3 more
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Digital Subtraction Angiography: Technology, Equipment, and Techniques
Radiologic Clinics of North America, 1985The equipment used in digital subtraction angiography is a combination of x-ray equipment and high-speed image-processing equipment. In this article, the components of a DSA system are described, including the x-ray generator, x-ray tube, image intensifier, television system, analog-to-digital (A-D) convertor, image processor, and image acquisition ...
T W, Ovitt, J D, Newell
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Comparing Registration Techniques For Digital Subtraction Radiography
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 1992The study described in this paper presents a new imaging geometry based on the correspondence of 3D structures. It can be used to establish correspondence between pairs of clinical images taken at different proj ection angles and to produce reconstructed images comparable with images taken with mechanical devices.
Arthur Ponce +4 more
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A digital subtraction technique for dual isotope scintigraphy
Physics in Medicine & Biology, 1971A technique for the subtraction of one random pulse train from another is described. The technique uses digital methods and operates at count-rates up to 5000 per second. It is particularly suited to dual isotope investigations in nuclear medicine where techniques employing analogue methods may introduce errors because of inherent integrating time ...
J A Aspinall, J R Kemplay
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MP‐RAGE subtraction venography: A new technique
Journal of Magnetic Resonance Imaging, 1995AbstractPreliminary evaluation of a new magnetic resonance (MR) venography technique was performed with data sets from five patients undergoing BAR imaging of the brain before and after intravenous administration of gadopentetate dimeglumine. Before contrast agent injection, the patients were imaged with MP‐RAGE (magnetization‐prepared rapid gradient ...
Andrew W. Litt +2 more
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Image Subtraction by the Spatial Filtration Technique
Optica Acta: International Journal of Optics, 1985An image subtraction technique is presented and analysed. It is based on the simultaneous use of three similarly oriented diffraction gratings, two of which are aligned with the images to be subtracted. The third is located in the Fourier plane. The technique is shown to impose less stringent requirements on the alignment of the optical system, the ...
A.A. Lapides, M.E. Zhabotinski
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