3.3 Laser-Holographic Complex …
265
research method of human chest was developed, the structure of the laser-holographic
complex as well as its principle of operation for estimating the state of human circulatory system were realized. There was developed a functional block scheme of the
complex, including both main units of the complex and also functional interactions
between them. The obtained results became the base for the formulated medicaltechnical requirements to the laser-holographic complex. A principle optical scheme
was designed for implementation of these methods and includes the systems the of
reference and reconstructing beams, which illuminate the object under study, as well
as a phase modulation system and a system of interferogram formation.
It was shown the possibility of determining not only quantities but also relative
shift directions of the points on the surface under study using the scheme of recording
and reconstruction of holograms with two spatially separated reference beams.
As a result of the study on the experimental sample, it was established that the
PTP-medium is in principle more sensitive and convenient in a real experiment. There
is no need in wet processing, in gear for returning the hologram to the exposure place.
The cycle “recording-reconstruction” lasts for a couple of seconds. The PTP-matrix
by “Newport Report Corporation” (USA) would completely solve the problem. To
record a hologram on photoemulsion, the pulse laser energy should be increased
at least 10 times, and for this purpose, ruby amplifier stage is needed. Works on
hologram recording on a thermoplastic carrier were conducted in collaboration with
the Institute of Applied Physics of the Academy of Sciences of the BSSR.
A glass PTP-matrix was used in the experiments. Interferograms of human chest
were obtained.
He–Ne laser LGN-215 with the wavelength of 632.8 nm was used to reconstruct
the recorded interferogram. To do this, the radiation was inserted in the path of the
ruby laser with the relocatable mirror 23.
The results of the experiments on interferogram recording of a human body are
shown in photos (Fig. 3.45). In the figure, holographic interferograms of human
chest are shown. Time interval between the pulses is 300 and 400 μs. As it is seen
from the holographic interferograms, the radiation parameters of the used laser and
parameters of hologram recording system provide survey of the human chest. In
Fig. 3.45, the holographic interferogram of human body from the neck to the waist
is presented. In figures, oscillation sites are clearly seen in the collarbone area (1),
in the larynx area (2), and in the diaphragm area (3). Figure 3.45 illustrates a part of
the left shoulder and forearm is seen.
The interferograms give the possibility to determine two areas of concentration of
fringes, which correspond to maximal shifts of the object surface. One concentration
area is located near the larynx (upwardly), and the other is in the area of the diaphragm
(below). It is easily seen that the fringes are distributed on the body more evenly,
though the fringes are located more densely in the areas, which correspond to the
maximum of shifts on the first interferogram. Thus, the surface shift is greater in these
places than in other parts of the object under study, but their value is considerably
less in the second case than in the first one. The obtained time-shifted holographic
interferograms illustrate differences in distribution of pulsation centers of activity on
the surface of a human body. Analyses of results of the medical study of circulatory
265
research method of human chest was developed, the structure of the laser-holographic
complex as well as its principle of operation for estimating the state of human circulatory system were realized. There was developed a functional block scheme of the
complex, including both main units of the complex and also functional interactions
between them. The obtained results became the base for the formulated medicaltechnical requirements to the laser-holographic complex. A principle optical scheme
was designed for implementation of these methods and includes the systems the of
reference and reconstructing beams, which illuminate the object under study, as well
as a phase modulation system and a system of interferogram formation.
It was shown the possibility of determining not only quantities but also relative
shift directions of the points on the surface under study using the scheme of recording
and reconstruction of holograms with two spatially separated reference beams.
As a result of the study on the experimental sample, it was established that the
PTP-medium is in principle more sensitive and convenient in a real experiment. There
is no need in wet processing, in gear for returning the hologram to the exposure place.
The cycle “recording-reconstruction” lasts for a couple of seconds. The PTP-matrix
by “Newport Report Corporation” (USA) would completely solve the problem. To
record a hologram on photoemulsion, the pulse laser energy should be increased
at least 10 times, and for this purpose, ruby amplifier stage is needed. Works on
hologram recording on a thermoplastic carrier were conducted in collaboration with
the Institute of Applied Physics of the Academy of Sciences of the BSSR.
A glass PTP-matrix was used in the experiments. Interferograms of human chest
were obtained.
He–Ne laser LGN-215 with the wavelength of 632.8 nm was used to reconstruct
the recorded interferogram. To do this, the radiation was inserted in the path of the
ruby laser with the relocatable mirror 23.
The results of the experiments on interferogram recording of a human body are
shown in photos (Fig. 3.45). In the figure, holographic interferograms of human
chest are shown. Time interval between the pulses is 300 and 400 μs. As it is seen
from the holographic interferograms, the radiation parameters of the used laser and
parameters of hologram recording system provide survey of the human chest. In
Fig. 3.45, the holographic interferogram of human body from the neck to the waist
is presented. In figures, oscillation sites are clearly seen in the collarbone area (1),
in the larynx area (2), and in the diaphragm area (3). Figure 3.45 illustrates a part of
the left shoulder and forearm is seen.
The interferograms give the possibility to determine two areas of concentration of
fringes, which correspond to maximal shifts of the object surface. One concentration
area is located near the larynx (upwardly), and the other is in the area of the diaphragm
(below). It is easily seen that the fringes are distributed on the body more evenly,
though the fringes are located more densely in the areas, which correspond to the
maximum of shifts on the first interferogram. Thus, the surface shift is greater in these
places than in other parts of the object under study, but their value is considerably
less in the second case than in the first one. The obtained time-shifted holographic
interferograms illustrate differences in distribution of pulsation centers of activity on
the surface of a human body. Analyses of results of the medical study of circulatory