At registration of two-dimensional x-radiation projections of
heterogeneous objects the problem (task) of weakly contracting details disclosing
against a background complete image structure has arisen. One of the effective
methods of mentioned problem salvation is the method of several internal object
elements staining by means of substance (having the linear weaking coefficient
- µ which essentially differs from corresponding parameter of others object
elements). This method is widely used in medicine, at that staining (as a rule)
is provided with the help of heavy metals joining with the atomic number Z>50:I,
Ba, Ta, Xe. Development (evolution) of such diagnostic technics is combination
of staining and subtraction image methods getting, for example, before and after
staining substance inputting. It let to reduce the influence of different internals
images imposition abruptly and to mark out staining structures selectively.
Especially effective selective marking out of structure under consideration
details when we use narrow spectral bands situated (located) at energy spectrum
distantly from K-leap of staining element photo absorption. When we use as a
source, for example, x-ray tube with copper anode for staining it would be well
to use nickel salt, for which K-leap is situated (located) between bands (lines)
of alpha and beta copper. Image selection created by means radiation nearby
these bands (lines) we produced with the help of translucent monochromators
(for more details see the reference).
After short computer treatment (processing)
of these two images A and B; one is subtracted from the other so we had differential
image B=A - C.
The image getting as a difference of two images fixed in different areas (sections)
of the spectrum has essentially much contrast than each of them. As illustration
of this method we have triptych – three images composition. The middle one is
getting by subtraction the right one from the left one (for more details see
triptych).
2s52-50=А.Г. Турьянский, И.В. Пиршин.
"Методы регистрация разностных рентгеновских проекций"
1t49-43=A.G.Touryanski, A.V.Vinogradov,
I.V.Pirshin, N. Publicover, V. Kantsyrev, I.G. Grigorieva, A.A. Antonov.
"Semitransparent
monochromators for X-ray imaging and X-ray beam manipulation".
International
Symposia: Roentgen's Heritage. Quantum Hall Effect and Heterostructures. Wuerzburg,
Germany, December 11-15, 2001. Book of Abstracts, P. 14.
1s43-44=Touryanski,
Alexander G.; Pirshin, Igor V.; Vinogradov, Alexander V.; Publicover, Nelson
G.; Kantsyrev, Victor L.; Grigorieva, Inna G.; Antonov, Alexander A.
"Semitransparent
monochromators for x-ray imaging based on highly oriented pyrolytic graphite
(HOPG)".
Proc. SPIE.
Penetrating Radiation Systems and Applications III. Vol. 4508, (2001) p. 58-64.