Results 111 to 120 of about 71,044 (162)

Subtraction Technique in Intravenous Aortography

Radiology, 1977
Excretory urography using the subtraction technique (100 ml of 60% urographic media injected in 10-12 seconds) demonstrated the aorta and its major branches well enough to prove useful clinically. The method is fast and graphic, and risk seems no greater than that associated with the standard urographic examination.
W J, Mikkelsen, G Y, Yim, V, Bandrevics, D R, James   +3 more
exaly   +5 more sources

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Illuminator for Subtraction Technique

Radiology, 1971
The authors describe a simple, inexpensive illuminator for use with the subtraction technique and in film duplication.
T A, Kendig, A, Hood
exaly   +3 more sources

Subtraction Radiography: Techniques and Limitations

Radiology, 1977
Subtraction radiography permits the use of 7-10 times less contrast material than is required without subtraction techniques. The first-order, second-order, and composite mask techniques are described and evaluated. While the second-order technique gives more complete cancellation of common structures, the more commonly used first-order technique was ...
M G, Ort, E C, Gregg, B, Kaufman
openaire   +2 more sources

Incoherent image addition and subtraction: a technique

Applied Optics, 1979
A technique of incoherent image addition and subtraction is described. The basic advantage of this technique is its use of white light processing, in which case the unavoidable artifact noise in the coherent optical processor may be removed. Although the incoherent processing technique that we have proposed is effective only in a 1-D operation, it also
F T, Yu, A, Tai
openaire   +2 more sources

Subtraction sialography: An improved and simplified technique

Oral Surgery, Oral Medicine, Oral Pathology, 1971
Abstract 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.
J S, Buchignani, P M, Shimkin
openaire   +2 more sources

Contact screen image subtraction technique

Applied Optics, 1981
Experimental results have clearly demonstrated that the newly proposed optical contact screen pulse-width modulation image subtraction technique can be used for the evaluation both qualitative and quantitative of the subtle differences between two similar images.
D, Zhao, C K, Chiang, H K, Liu
openaire   +2 more sources

A digital subtraction technique for dental radiography

Oral Surgery, Oral Medicine, Oral Pathology, 1983
The relative accessibility and stability of the teeth facilitate generation of geometrically identical radiographs over a period of time. When such radiographs are digitized with the aid of a TV camera coupled to an analog to digital converter and a computer, it is possible to conveniently produce subtraction images of high diagnostic value.
H G, Gröndahl, K, Gröndahl, R L, Webber   +2 more
openaire   +2 more sources

Image Subtraction Techniques in Immunoscintigraphy

International Journal of Radiation Applications and Instrumentation. Part B. Nuclear Medicine and Biology, 1986
This paper is devoted to the application of the Image Subtraction Technique to immunoscintigraphy. It is technical, because, although based on simple principles, this method raises problems which are not always satisfactorily solved. It is divided into three parts.
openaire   +1 more source

THE SUBTRACTION TECHNIQUE OF THERMOLUMINESCENT DATING

Archaeometry, 1973
ABSTRACTSCombination 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
openaire   +1 more source

Newer Subtraction and Filtration Techniques

Radiologic Clinics of North America, 1985
This article attempts to describe and superficially evaluate the present and future application of a number of newer subtraction techniques, including recursive temporal filtration, matched filtration, hybrid subtraction, tomography and tomosynthesis, and parametric imaging and image processing.
openaire   +3 more sources