Electrical impedance mammographs MEIK MEIK v.5.6

Products: Electrical impedance mammograph MEIK MEIK v.5.6

Devices for electrodiagnostics of breast diseases have been developed and created in Russia, both for mass screening of women (of any age, including pregnant women) and for in - depth examination of the state of the mammary glands, buy the device from the manufacturer with a guarantee.

 

Main parameters and dimensions:

• Overall dimensions of the mammograph - 220x190x100 mm
• The mass of the mammography unit is no more than 2.9 kg.

Equipment:

• Measuring unit consisting of a built - in microprocessor and a matrix (diameter 12 cm) with contact measuring electrodes. The number of gold - plated electrodes is 256 pieces.
• Patient communication cable with double contacts for self - adhesive gel electrodes.
• A stand for the device, which ensures that the electrodes do not contact with other objects in an inoperative state.
• Software and database on CD
• User manual on CD
• Atlas of electrical impedance images on CD
• Disinfectant wipes set
• Disposable Gel Electrodes

Electrical characteristics:

• The power supply of the device is carried out through a standard USB port of a personal computer with a direct current with a nominal voltage of 5 V.
• The current consumed by the mammograph from the USB port is no more than 0.4 A.
• The injected current for scanning is within 0.5 ± 10% , mA
• Scanning current frequency 50 ± 5% , kHz
• The mammograph ensures operability when the electrode - skin resistance changes in the range from 100 Ohm to 2 kOhm.
• The mammograph provides a "bad contact" signaling when the electrode - skin contact resistance is 20 kOhm or more.
• The electronic part of the device is powered by specialized DC - DC converters.
• Performance characteristics
• The mammograph provides continuous, for 8 hours, continuous operation with a constant load.
• Execution time of one scan cycle no more than 35 seconds
• Image reconstruction time is no more than 1 minute (depends on the characteristics of the personal computer).
• Time to complete the examination in screening mode - 3 - 5 minutes / patient
• Examination time in stationary reception mode - 15 - 20 minutes / patient
• The warranty period for electrical impedance computer mammography "MEIK" ® 5th version is 2 years from the date of sale.
• Trouble - free operation of electronic components (manufacturer's warranty) - at least 5 years.

Description:

• non - invasive imaging technology.

An electrical impedance mammograph by means of external scanning measures electromagnetic phenomena and their changes.

• 3 - D tomographic system

Since the propagation of electric current cannot be limited to a two - dimensional plane, the measured data reflects the change in electrical conductivity in three - dimensional space, providing a layer - by - layer image of the object.

• belongs to the category of soft - field tomography

Unlike a computerized X - ray tomograph, magnetic resonance imaging, positron emission tomography, which belong to the category of hard - field tomography.

• uses (non - local) non - localized EIT imaging technology

A feature of the technology for creating a tomographic image with non - localized properties is that all points on the scanned object affect the measurement result, the so - called cross measurement. The pixel value will depend on both the structure of the object and the structure of the surrounding tissue.

• alternating current (50 kHz, 0.5 mA)

The flow of a constant, i. e. , unidirectional current through electrolytes, in particular through biological tissues, is accompanied by irreversible chemical reactions at the electrodes, through which the object is connected to the external part of the electrical circuit, therefore, in medical diagnostics, only alternating electric current of a sufficiently high frequency is used (as a rule , above 1 kHz). The permissible current value is limited by its biological effect and increases with increasing frequency.

The characteristics of the electric current used in the mammograph are approved for use in medicine and are safe for the doctor and the patient and are significantly lower than the "threshold", that is, they do not cause any pain or other sensations in humans.

• 256 electrode panel with planar arrangement of electrodes

A flat set of electrodes is used. The electrodes in a planar configuration are located in the same plane. In this configuration, the electrodes are mounted on the platform of a hand - held mammography unit.

The advantages of using a planar electrode configuration are as follows:

a. The electrodes are fixed on the board and the position of the electrodes is precisely known, so that the position error problem can be avoided.

b. The scanning panel is manoeuvrable and can easily be moved around the patient's body, so that the equipment can be designed for real - time use.

v. The resolution when using a planar configuration of electrodes is higher than when using a circular configuration of electrodes, since a minimum distance to internal structures is provided.

• cross - over data collection

When conducting electrical impedance research, a set of electrodes is placed on the surface of the object, some of which are used as inductors, and some as measuring electrodes. Typically, a current source is used as an inductor, and the potential differences between the measuring electrodes are measured. All measurements are carried out on the surface of the object under study. This is the so - called adjoining method, in which two electrodes located on the surface of the object are used as a source of a weak alternating current that generates an electric field, and the other two electrodes, also located on the surface of the object, are used as a recorder of changes in electrical potential. All electrodes are used in the measurements in pairs.

• back projection method as an image reconstruction algorithm

The algorithm of back projection along the equipotential surfaces of the electric field with a weighting function along the horizontal and vertical lines is used to reconstruct a volumetric static frequency image. The image is reconstructed in layers that are parallel to the electrode panel. Initially, the back projection method was developed as an empirical method based on the straightness of the propagation of scanning radiation in the tissue (ie, on the presence of "rays"). It was widely used in X - ray tomography, but it was carried over to the case of EIT, and instead of "rays", the lines of force of the electric field were used here. In electrical impedance mammography, there are no rays and the concept of "pseudo - rays" has to be used. The possibility of introducing the concept of such a "pseudo - ray" is associated with the following fact: the change in surface potential differences (in comparison with the homogeneous case) caused by the presence of local inhomogeneity in the object is mainly concentrated in the region that is the projection of the inhomogeneity onto the object surface along the equipotential lines (or surfaces) of the field. Thus, the back - projection method is carried over to the case if instead of beams, the lines of force of the electric field strength, calculated for the case of a uniform distribution of conductivity, are used.

• static image

The advantage of the mammograph is the ability to reconstruct the absolute or static conductivity in the absence of the necessary reference data set. The static image consists in producing an image of the absolute distribution of impedance in the body area, that is, as a result, an anatomical image of the scanned area is formed. Electrical impedance mammography seeks to obtain an image of an object closely related to its internal structure.

• quantitative diagnostic information

The fundamental difference between electrical impedance scanning from other tomographic methods is that in addition to visual assessment of the image, electrical impedance mammography provides quantitative information. Quantitative information allows you to determine the structure of the mammary gland, identify areas with abnormal electrical conductivity, form a risk group for the development of breast cancer, etc.

Services:

 

• Upgrading older versions of the device

The SIM - tekhnika company upgrades old versions of MEIK electrical impedance mammographs to modern versions.

• Warranty and post - warranty repair

Warranty repairs are made free of charge (if the factory seal is retained).

• Medical consultations

The specialists of the company "SIM - tekhnika" provide services in consulting complex clinical cases. Also, on the basis of the educational and methodological center of the PCF "SIM - tekhnika", training is carried out on working with the electrical impedance mammography "MEIK".

• Presentations and master classes

The specialists of the company "SIM - tekhnika" are ready to take part in exhibitions, presentations and master classes held by our partners both in Russia and abroad.

Mammography (from Latin mamma "mammary gland" + Greek γραμμα "record") is a section of medical diagnostics that deals with non - invasive examination of the mammary gland, mainly female.

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