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Biomedical subjects

K D Kalantarov

Publications and source records attributed to K D Kalantarov.

At least 19 recordsLinked to original sources
PubMed1990

[Single-photon emission-computed tomography with the Testascan multidetector gamma tomograph in neurologic practice].

The paper is concerned with the results of single-photon emission tomography and gamma-topography in patients with cerebral tumors, cerebral circulatory disorders and pathology of the liquor system. Tomographic investigation was shown to enhance the accuracy and reliability of the detection of cerebral tumors. Single-photon emission computerized gamma-tomography (SPECT) permitted the detection of structural and morphological cerebral changes in disturbed cerebral circulation of various etiology. SPECT together with computerized tomography and radionuclide cisternography was shown to be an auxiliary method for visualization of the cerebral cisterns. Radionuclide tomographic images as compared to gamma-topographic findings of the brain possessed a high statistical significance and good resolution.

Adult↗
PubMed1990

[Single-photon emission-computed tomography of the head using labelled amines in visualizing the cerebral microcirculation].

The authors presented clinical material on cerebral hemodynamics in patients with neurological pathology in suspected tumor vascular cerebral diseases and craniocerebral traumas. Investigation of cerebral microcirculation was performed using a multidetector single-photon emission tomograph "Testoscan" (USSR) after iv administration of 99mTc-hexamethylpropilene-amyloxine. This radiopharmaceutical is good for the evaluation of cerebral perfusion and gives a clinician rich information on cerebral microcirculation.

Adult↗
PubMed1989

[The TESTASCAN single-photon emission multidetector computed gamma tomograph].

A TESTASCAN single-photon emission multidetector gamma tomograph is a special purpose unit designed to investigate RP distribution in the brain. It permits obtaining transversal tomographic images with the resolution of about 10 mm, the thickness of an emitted layer being about 15 mm. The time of patient's examination during obtaining an image of 10-12 layers does not exceed 30 min. and can be reduced by increasing RP activity and minimizing the number of emitted transversal sections. The clinical testing of the unit has shown that it is reliable in maintenance and simple to operate during radionuclide data collection, reproduction and analysis. Emission computerized tomography in brain tumors can be regarded as a method increasing the accuracy and reliability of radionuclide diagnostic examination of neurosurgical and neurological patients.

Brain Neoplasms↗
PubMed1989

[Radioanatomy of cerebral perfusion in single-photon emission-computed tomography using 99mTc-labelled amines].

A study was made of the cerebral hemodynamics by assessing the distribution in single-photon emission computerized tomography with 99mTc-hexamethyl-propyleneminoxyne in health using a Testascan in 9 standard slices. The whole set of tomographic slices was conventionally divided into 3 levels. For better orientation in gamma-tomographic images, pictures were presented where in addition to scintigrams a morphological scheme of the cerebral parts with the marked parts perfused by cerebral arteries, was given.

Brain↗
PubMedDate not supplied

[Adsorption and desorption of the radionuclide 133Xe on carbon adsorbents with varying porous structures].

The paper concerns adsorbents with different porosity intended for adsorption of gaseous 133Xe from the flow of a gas-air mixture exhaled by the patient undergoing the diagnosis, for instance, of the pulmonary system or cerebral blood flow. The data obtained were visualized on a gamma-chamber. An adsorbent exhibiting the highest adsorption capacity was selected. It has been shown that transport porosity of adsorbents does not play any significant role in adsorption of gaseous 133Xe. During adsorption, a much greater role is played by binding energy.

Adsorption↗
PubMedDate not supplied

[Right-to-right arteriovenous shunting in the compensation of pronounced disorders of pulmonary ventilation].

The mechanism of compensation for disorders of ventilation after pulmonary tissue resection is discussed. It is shown that these disorders are attended with reduction of arterial pulmonary blood flow and that angiospasm occurs in the postcapillary part of the vascular channel of pulmonary circulation. The compensatory effect is achieved by a right-to-right arteriovenous shunt which prevents extreme increase of pressure in the pulmonary artery in ventilation disorders.

Adolescent↗