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Biomedical subjects

A M Turkin

Publications and source records attributed to A M Turkin.

14 recordsLinked to original sources
PubMed1991

[Magnetic resonance tomography in evaluating the efficacy of the radiation therapy of tumors in the upper respiratory tract].

Analysis of the diagnostic potentialities of MR-tomography in the assessment of radiotherapeutic efficacy was performed in 11 patients (malignant tumors of the upper respiratory tract in 10 and juvenile nasopharyngeal angiofibroma in one). Repeated investigation was performed after abatement of local radiation reactions (usually after 4-8 weeks). MR-tomography permitted the assessment of the state of the accessory sinuses of nose, the detection of a residual tumor, and the differentiation between tumors and inflammatory changes of the mucosa. In one case radiotherapy resulted in the regeneration of posterolateral wall of the maxillary sinus.

Evaluation Studies as Topic↗
PubMedDate not supplied

[The use of three-dimensional reconstruction in neuroroentgenology].

The recent advent of spiral computed tomography (CT) and new fast impulse sequences in magnetic resonance imaging (MRI) into diagnostic practice has expanded the range of brain and spinal diseases detected by these techniques. This has also expanded the field of use of three-dimensional images obtained on the basis of mathematical algorithms for processing CT and MRI data. At present, not only neurotraumatology and maxillofacial surgery are the main areas in applying three-dimensional models. Spatial representation of bulky formations of the brain, their mutual location with the adjacent anatomic structures (with ventricles of the brain) may be useful in choosing a surgical access and in planning the scope of a surgical intervention. CT- and MR-angiographies that are now successfully used in diagnosing vascular pathology, providing high-solution angiograms not only can be competitive with direct angiography, but can replace this sophisticated study for vascular stenotic processes in the neck. Moreover, analyzing the internal surface of the vascular wall on the basis of virtual endoscopy may be useful in direct surgical and endovascular interventions. The purpose of this study was to pool long-term experience in using three-dimensional images in the qualitative improvement of diagnostic methods in examining neurosurgical patients and to define the most promising lines of their use in neurosurgery as a whole.

Brain Diseases↗
PubMedDate not supplied

[The dynamics of brain edema in severe craniocerebral trauma (computed tomographic and magnetic resonance studies)].

The dynamics of vasogenic brain edema were studied with comparison of the results of CT and MRT in 17 patients with severe craniocerebral trauma (CCT). It was established that edema fluid clearance in vasogenic edema in the early stages of CCT occurs through various parts of the ventricular system, which is confirmed by the hypodensity "path" on the CT and the "path" of increased activity on the MRT. The authors revealed a phenomenon of "interruption" (cessation) of the sanogenous "path" connecting the foci of contusions and/or intracerebral hematoma with the ventricular system. The formation of a more or less marked mass-effect is evidently needed for the occurrence of pressure gradient which would be sufficient enough to move the edema fluid and disintegration products from the traumatic substrate into the ventricular system.

Acute Disease↗
PubMedDate not supplied

[Magnetic resonance tomography of malignant tumors of the maxilla].

The authors discussed their experience in investigating 20 patients with maxillary malignant tumors using routine x-ray studies and MR-tomography, and 13 patients, investigated in the same way plus CT. MRT permitted defining a topical localization of a tumor and its spreading to adjacent anatomical regions (the pterygopalatine and infratemporal fossae, pharynx and peripharyngeal space, orbit, buccal soft tissues, and the cranial cavity). MRT was used to differentiate between tumor tissue and inflammation even within the sinus. As to the detection of osseous destruction, CT seemed much more superior than MRT. It was only in one patient that x-ray findings brought about better results than MRT because of artefacts resulting from metal crowns on the affected side.

Adult↗
PubMedDate not supplied

[Magnetic resonance tomography in the diagnosis of paranasal sinusitis].

The potentialities of a new method--magnetic resonance tomography (MRT)--as applied to the diagnosis of paranasal sinusitis are discussed. The method permits detection of inflammation in the paranasal sinuses identified as a significant enhancement of a signal in the projection of the affected sinus. This paper presents two cases: patients with rhinosinusogenic cerebral arachnoiditis and arachnoencephalitis in whom paranasal pathologies which had no clinical manifestations were diagnosed by MRT. This helped to choose adequate therapy. In contrast to X-ray methods, MRT causes no unnecessary irradiation which allows repeated examinations.

Adult↗
PubMedDate not supplied

[Magnetic resonance tomography in the diagnosis of juvenile nasopharyngeal angiofibromas].

This work is based upon the experience in the diagnosis of juvenile nasopharyngeal angiofibromas (JAF) in 14 patients using MR-tomography and routine x-ray examination. In all the patients MR-tomography made it possible to assess the topical position of a tumor, its spreading to the cranial, nasal, accessory sinusal and orbital cavities, and the pterygopalatine and infratemporal spaces. MR-tomographic diagnosis made it possible to differentiate between tumor invasion and inflammatory processes detecting JAF attending tubotitides. However MR-tomography cannot be used alone to assess the status of osseous tissue.

Adolescent↗
PubMedDate not supplied

[Magnetic resonance tomography in the diagnosis of chronic intracranial hematomas].

The authors set forth a method of magnetic resonance tomography with superlow field intensity which is used for identifying chronic intracranial hematomas. They describe the magnetic resonance tomographic syndromes of chronic subdural and epidural hematomas and the possibility of their differentiation from hygromas of the meninges.

Adolescent↗
PubMedDate not supplied

[The contrast enhancement of brain and spinal cord tumors using Gd-DTPA in magnetic resonance tomography with an extra-low magnetic-field intensity].

The contrasting agent Gd-DTPA (Magnevist, Schering AG, Germany) was tested when used in magnetic resonance tomography using extra-low (0.04 T) magnetic field intensity in 68 patients with various brain and spine tumors. The agent was injected intravenously in a dose of 0.1 mmol/kg. No complications were found. The tests showed its high efficiency in the diagnosis of brain neoplasms (particularly in malignant intracerebral disorders, meningiomas and neurinomas). Benign astrocytomas induced no noticeable signal intensification on post-contrasting T1-weighed tomograms. In all cases of spinal tumors, the application of Gd-DTPA could specify the extent of tumor invasions, the presence of cysts and identify accessory tumor nodes in one case.

Adult↗