Russian Journal of Nondestructive Testing

Article	Citations
Solving the Inverse Problem of Surface Reconstruction during Electron Beam Surfacing	16
The Research and Application of Wheeled Dry-Coupling Ultrasonic Technology in Steel Plate Thickness Measurement	13
Detection of Electrical Fault in Medium Voltage Installation Using Support Vector Machine and Artificial Neural Network	13
Range of Applicability of a Technique for Constructing Magnetic Induction Lines for Flaw Sizing in Extended Objects	12
Analysis of Test Results and Test Quality during Certification of Non-Destructive Testing Specialists	11
Determining the Coordinates of Reflectors in a Plane Perpendicular to Welded Joint Using Echo Signals Measured by Transducers in the TOFD Scheme	11
Experimental Study of Ultrasonic Wave Propagation in a Long Waveguide Sensor for Fluid-Level Sensing	11
An Ultrasonic Non-Destructive Evaluation of Contents of Silica Powder and Carbon Black in Nitrile Rubbers	10
Fatigue Behavior of Small Bore Piping Welded Joints under Vibration: Metallurgical and Nondestructive Evaluation	9
A Study on the Failure Analysis of M10 Bolt Caused by Prefabricated Cracks Based on Ultrasonic Method	9
Evaluation of Subsurface Defects Using Pulsed Thermography and Laser Shearography of Additively Manufactured AlSi10Mg Alloy Made by Laser Powder Bed Fusion Process	8
Reliability of Dye Penetrant Inspection Method to Detect Weld Discontinuities	7
Experimental Investigation to Improve Inspection Accuracy of Magnetic Field Imaging-Based NDT Using Deep Neural Network	7
Specific Features of Nondestructive Testing of Polymer and Composite Materials Using Air-Coupled Ultrasonic Excitation and Laser Vibrometry	7
Development of Image Reconstruction Algorithms for Few-View Computed Tomography at RFNC–VNIITF: History, State of the Art, and Prospects	7
Reconstruction of Reflector Images at the Boundary of the Base and Deposited Metal Using Plane Wave Imaging Technique	7
Differential Background of Electric Signal Read from an Induction Magnetic Head	7
Experimental Method to Enhance Sensitivity and Accuracy of Measurements in Measuring Fracture Parameters around the Crack Tip Using Compact Hololens Imaging System	7
Deep Learning Based Simple CNN Weld Defects Classification Using Optimization Technique	7
Artificial Neural Networks Based Method for Measuring the Distance between Two Metal Plates Using Compton Scattering	7
On the Issue of Interpretating Echograms in the Contact Technique	7
Studying Detectability of Plane Surface Defects by Ultrasonic Method Using Rayleigh Waves	7
Iterative Reconstruction of Aluminum Casting Images Taking into Account Prior Information	6
Defect Analysis in Compressor Vanes Using Split Bregman Noise-Reduced Digital Industrial Radiography	6
Automated Processing of Data from Measurement of Thermo-Electromotive Voltage and Magnetic Noise Voltage in Metals and Alloys	6

Study of Additive Manufacturing Products Using Neutron Imaging	6
Calculating the DGS Curve for Images Reconstructed by Digital Focusing of Aperture Method	6
Infrared Thermographic Diagnostics of Wood Fire Resistance under Combined Thermal Exposure of a Surface Fire Front and Burning and Smoldering Particles	6
Nondestructive Testing Method for Electrical Capacitance Tomography Based on Image Reconstruction of Rotating Electrodes	6
Characterization of Temperature-Dependent Behavior in Hot Rolled EN8 Steel	5
Evaluation of Tensile Deformation of 304 Steel Plate Using Electromagnetic Ultrasonic Lamb Waves Mixing	5
On the Question of Interpreting the Echograms of Ultrasonic Pulse Flaw Detector	5
Increasing Probability of Detecting Acoustic Emission Sources Using Artificial Neural Networks	5
Influence of Molding Methods on Defects in AFM Carbon Fiber Samples under Static Loading	5
Enhanced Subsurface Analysis Using Proper Orthogonal Decomposition in Nonstationary Thermal Wave Imaging	5
Ultrasonic Measurement Optimization of Spot Welding Diameter of Thin Plate Based on Gain Compensation Algorithm	5
An Investigation of the Void Structure of Lightweight Concrete Containing Waste Undersize Pumice Additive Using Nondestructive Methods	5
Evaluating the Probability of Detecting Acoustic Emission Signals Using the Amplitude Discrimination Method with a Low Signal-to-Noise Ratio	5
Detecting Flaws in Pumping-Compressor Pipe Couplings by Magnetic, Eddy Current, and Ultrasonic Multiple-Shadow Testing Methods	5
Detecting Violations in Stacking of Fiber Layers in CFRPs Using Broadband Acoustic Spectroscopy	5
Ultrasonic Characterization Method of Carbon Nanotubes Orientation Using Sparse Representation	4
Monitoring the Appearance of the End Faces of Fuel Pellets under Conditions of Conveyor Production	4
Algorithm for Evaluating Errors in Recognition of Materials in X-Ray Testing System Containing X-Ray Sandwich Detectors	4
Analysis of the Circumferential Wave Dispersion of an Acoustic Signal Backscattered by a Porous Tube: Cortical Bone	4
Assessment of Local Defects on the Inner Surface of Gas Pipelines Transporting CO2-Containing Products	4
Comparison of Methods for Modifying the Emission Spectrum of a Pulsed X-ray Source to Determine the Most Effective Dual-Energy Image Processing	4
Research on Correction Method for Fan-Shaped Beam Digital Radiography Imaging with Linear Array Detectors	4
Eddy Current Testing of Fatigue Degradation of Metastable Austenitic Steel under Gigacycle Contact-Fatigue Loading	4
Real-Time Ultrasonic Monitoring of the Vulcanization Process in Nitrile Rubbers	4
High Precision Ultrasonic Testing Method for Density of Engineering Plastics	4
A Numerical Model for Ultrasonic Time-of-Flight Diffraction (TOFD) Testing of Austenitic Welds	4
Experimental Study of Concrete by Using Ultrasonic Surface Waves at Hundreds of Kilohertz Frequency Range	4
Testing Electrophysical Parameters of Metamaterials by the Method of Surface Electromagnetic Waves	4
Reconstructing the Topography of Surface Defects of Ferromagnets in a Normal Magnetization Field	4
Identification of Cracks and a Mathematical Model of the Magnetostatic Field of Defects in a Plate	4
Simulation of Air-Coupled Transducer Operation in Structural Health Monitoring Systems	4
Study on Equal Interval Sampling Method Promoting Efficiency of Post-Processing Algorithms for Infrared Thermography Inspecting Carbon-Fiber Reinforced Plastics Composites	4
Nondestructive Testing of an Aluminum Alloy Welded Joint Based on a Mathematical Model of the Thermal Welding Process and Computer Microtomography	4
Ultrasonic Testing of Butt Joints in Electric Steel Plates Using Lamb Waves	4
Comparison of Digital Radiography and Computed Tomography as Nondestructive Testing Techniques for the Assessment of Lack of Fusion Defects in Additively Manufactured SS316L Coupon	4
Methodological Principles for Determining Electrophysical Parameters of Materials and Coatings with a Complex Internal Structure Using Surface Electromagnetic Waves	4
The Influence of Biaxial Symmetric Tension on the Magnetic Properties of a Composite Specimen Made of Two Steel Plates with Different Mechanical and Magnetic Properties	4
Linear Structured Light System with Optimized Laser Stripe Extraction for Measurement of Large-Sized Workpieces	4
Revealing Magnetic Anisotropy in Austenitic Chromium–Nickel Steel After Rolling	4
Thermal Testing of Corundum Ceramics: Pulsed Heating and Optimized Data Processing Algorithms	3
Testing the Loading of Bearing Rings with Surface Waves Using Acoustoelasticity Effect	3
Advancing Damage Assessment of CFRP-Composite through BILSTM and Hilbert Upper Envelope Analysis	3
Nondestructive Characterization of Corrosion Properties of Stainless Steel and Titanium Alloys	3
An Empirical Study of Electrode Degradation in Gliding Arc Discharge	3
Method of State and Residual Resource Assessment of Excavator Bucket Tooth Caps	3
On the Solution to One Problem of Magnetostatics for a Pipe with Inner Surface Defect	3
Barker Code Thermography Inspection and Reliability Evaluation for CFRP Defects Detection	3
Study on the Relationship between Bolt Anchoring Defects and Complexity of Nondestructive Testing Signal	3
Estimation of the Segregation in a High Carbon Cast Steel by Thermoelectric Power Means	3
Normalization of Proton-Radiographic Images of Objects with Quasi-Uniform Areal Density	3

Pore Distribution and Damage Evaluation of Modified Red Clay Based on NMR	3
Image Restoration of Reflectors by Digital Focusing of the Aperture in Thick-Walled Pipes of Small Diameter	3
Explore the Influence of CFRP Surface Woven Fabric on Nonlinear Acoustic Detection	3
Three-Dimensional X-Ray Tomography of Industrial Objects with Limited Sizes of the Recording Screen	3
A Novel Methodology for the Transformer Winding Equivalent Ladder Network Circuit Parameters Identification by Employing the Frequency-Domain and Population Based Method	3
Automatic Detection of Threat Objects in X-ray Baggage Inspection Using Mask Region-Based Convolutional Neural Network and Deformable Convolutional Network	3
Investigation of the Performance of a Piezoelectric Ultrasonic Transducer by Finite Element Modeling	3
The Nondestructive Inspection of Agglomeration in Nanocomposite Parts Using Shearography and Improving the Results with Design of Experiment	3
Applicability of Nanoparticle Coating in Bone Density Evaluation Using Gaussian-Weighted Linear Frequency-Modulated Thermal Wave Imaging	3
Electrochemical Realkalisation of Carbonated Cementitious Matrix: Characterization Research to Influence of Time and Current Density	3
Investigating the Effect of High Voltage Electric Field on the Pesticide Residue in Tomatoes Using the Thermal Imaging Technique	3
Improvement of TFM-Image Quality due to Correction for “Stray” Delays between Antenna Array Elements	3
Modeling Propagation of Ultrasonic Waves in Anisotropic Material of Additive Manufactured Products	3
Immersion Testing of Curved Profile Objects by Surface Ultrasonic Waves	3
Developing a Method for Assessing the Degree of Hydrogenation of VT1-0 Titanium Alloy by the Acoustic Method	3
Investigation of High-Frequency Guided Wave Modes Applicability in Defect Detection Using Phased Array Ultrasonic Transducer	3
Enhancing the Efficiency of Defect Image Identification in Computer Decoding of Digital Radiographic Images of Welded Joints in Hazardous Industrial Facilities	3
Development of an Empirical Model for Damage Degree Assessment in Steel Specimens Based on the Results of Statistical Processing of Acoustic Emission Signal Flow	3
Segmental Search Method for Ultrasonic Inspection of a Wedge Dual-Layer Medium Using Full Matrix Capture	3
Erratum to: Analysis of Weak Signal Detection Based on Tri-Stable System under Poisson White Noise	3
Increasing Penetrating Power of Digital Radiography Systems Based on Analysis of Low-Intensity Signals	3
On Joint Application of Permanent and Alternating Fields in Magnetic Detection of Defects in Thick-Walled Steel Products	3
Dynamic Correction of Sensitivity of Flaw Detection Channels in High-Speed Rail Inspection	3
Assessment and Characterization of Welded Mild Steel (E-6013) Using Ultrasonic Testing and Hilbert Huang Transform	3
Simulation Model for Studying Object Structure Using Method of Layer-by-Layer Digital Compton Radiography	3
Contribution to Nondestructive Testing Study Using Lorentz Force	3
Reconstruction of Impact Damage in CFRP Laminate Based on Infrared Thermography	2
Determining the Type of Reflector from Amplitudes of Flares Reconstructed in Various Acoustic Schemes	2
Compressive Thermal Wave Imaging for Subsurface Analysis	2
Quantitative Nondestructive Testing of Steel Wire Rope Based on Optimized Support Vector Machine	2
Features of Application of Adaptive Interferometric Fiber Optic Sensors of Acoustic Emission to Monitor the Condition of Polymer Composite Materials	2
Ultrasonic Phased Array Total Focusing Method of Imaging with Rayleigh Waves Based on Principal Component Analysis	2
Synthesis of the Results of Ultrasonic and Thermal Testing of Metal–Polymer Composite Materials	2
Adaptation of Methodology for Monitoring Damage Kinetics and Assessing Load-Bearing Capacity in Relation to Steel Products	2
Method and Equipment for Infrared and Ultrasonic Thermographic Testing of Large-Sized Complex-Shaped Composite Products	2
Calculation of Magnetic Field Strength from a Semi-Infinite Cylinder Placed in an Arbitrary External Field	2
Testing Semiconductor Products Using Low-Frequency Noise Parameters	2
Studying the Evolution of the Power Spectrum of Acoustic Emission during Solid Body Destruction	2
Application of CF and DMAS Technology to Improve the Quality of Reflector Images Reconstructed from Echoes Measured by an Antenna Array	2
Layered Composite Hydrogenated Films of Zirconium and Niobium: Production Method and Testing Using Thermo EMF (Thermoelectric Method)	2
Analyzing the Processes of Carbon Fiber Sample Failure Using Acoustic Emission and Strain Gaging	2
Using the Poisson’s Ratio and Acoustic Anisotropy Parameter to Assess Damage and Accumulated Plastic Strain during Fatigue Failure of Austenitic Steels	2
Reducing Dead Zone in Ultrasonic Time-of-Flight Diffraction (TOFD): A Review	2
Reconstruction of the Amplitude of Signals of Acoustic Emission Based on Mathematically Modeling as a Stochastic Process	2
GPR Data Analysis for Accurate Estimation of Underground Utilities Diameter	2
Enhancing IR Thermographic Inspection of Subsurface Defects by Using the Technique of Edge Detection	2
Parametric Study of Anomaly Detection Models for Defect Detection in Infrared Thermography	2
Erratum to: Measuring the Acoustic Characteristics of Compact Concrete Building Structures Using the Impact Echo Method	2
Comparative Sensitivity of Informative Parameters of Electromagnetic-Acoustic Mirror-Shadow Multiple Reflections Method during Bar Stock Testing	2
Erratum to: Ultrasonic and Eddy-Current Fatigue Monitoring of Austenitic Steel Welded Joints	2
Distribution Network Cable Detection Based on Terahertz Pulse and Imaging	2
Features of Laser-Vibrometric Nondestructive Testing of Polymer Composite Materials Using Air-Coupled Ultrasonic Transducers	2
Scanning Path Planning of Ultrasonic Testing Robot Based on Deep Image Processing	2
Ultrasonic and Eddy-Current Fatigue Monitoring of Austenitic Steel Welded Joints	2
A Study of Full-Angle Synthetic Aperture Focusing Technique	2
Method of Processing Acoustic Information for Purposes of Monitoring State of Valves of Gas Cleaning Equipment	2
Thermal Testing of Corundum Ceramics: Conventional Techniques under Optical Heating	2
Mathematical Modeling of Radiation Transparencies in the Computational Implementation of the Dual Energy Method Based on the Analog Amplitude Analysis of Initial Signals	2
Determination of Stress State of a Uniaxially Loaded Concrete Element Using Amplitude of an Ultrasonic Pulse	2
Increasing Rate of Recording of Echo Signals with Ultrasonic Antenna Array using Optimum Sparsing of Switching Matrix with a Genetic Algorithm	2
Estimation of Flank Wear in Turning of Nimonic C263 Super Alloy Based on Novel MSER Algorithm and Deep Patten Network	2
Influence of Cable Attachment on the Spectrum of Transverse Eigenvibrations	2
Nondestructive Detection of Depth-Dependent Defects in Carbon-Fiber-Reinforced Polymer Composites by Terahertz Time-Domain Spectroscopy	2
Testing Semiconductor Products Using Low-Frequency Noise Parameters	2
Influence of Destabilizing Factors on Results of Thermoelectric Testing	2
Influence of Ca2+ Substitution on Elastic Properties of CaCu3Ti4O12 Quadruple Perovskites Determined by Ultrasonic Pulse Echo Selection Technique	2
Calculating the Magnetic Field Strength Inside and Outside of an Infinite Cylinder Placed in an Arbitrary External Field	2
Research on the In Situ Tensile Fracture Behavior of Q355E Steel and Its Welded Joints Based on Acoustic Emission	2
Dynamic Laser Speckle Imaging as a Nondestructive Method for Tracking the Dynamics in Slow Curing Epoxy Resin	2
Application of Non-Destructive Testing for Condition Analysis, Repair of Damages and Integrity Assessment of Vital Steel Structures	2
Quality Classification of Ultrasonically Welded Automotive Wire Harness Terminals by Ultrasonic Phased Array	2
Detecting and Evaluating Water Ingress in Horizontally Oriented Aviation Honeycomb Panels by Using Automated Thermal Nondestructive Testing	1
A Fast and Robust Method for Estimating the Parameters of Ground Penetrating Radar Waves of Concrete Structures	1
Determination of Position and Size of Non-Flaws at Albedo Flaw Detection	1
Acoustic Testing of Composite Rebars Taking into Account Reinforcement Ratio	1
Fabrication and Electric Characterization of SR/MWCNTs Nanocomposites for Piezoelectric Sensors under Thermal Conditions	1
Study on Granite Damage and Fracture Behavior and Theoretical Model Based on Pre-Peak Constant Amplitude Cyclic Loading Test Combined with Acoustic Emission Technology	1
Time-Frequency Based Thermal Imaging: An Effective Tool for Quantitative Analysis	1
The Acoustic Properties of Aspen Wood (Populus tremula), Modified by the Ultrasonic Method	1
A New Method of Active Thermal Testing: Combination of Heating and Forced Cooling	1

Method for Identifying the Grout Defects of the Anchors at Ultra-Early-Stage Based on Time-Domain Waveform Characteristic Reflection Points	1
Fast Method to Reconstruct and Enhance CT Images: Applied to Metal Artifact Reduction	1
Testing Uniaxial Stresses in Steels with Allowance for Their Magnetoelastic Sensitivity	1
Parameter Estimation for Ultrasonics Echoes Using an Weighted Mean of Vectors Optimizer	1
Assessment of the Compressive Strength of Self-Consolidating Concrete Subjected to Freeze-Thaw Cycles Using Ultrasonic Pulse Velocity Method	1
Estimation of Structural Degradation of the Heat Affected Zone of the Welded Joint Under Fatigue	1
Backcalculation of Elastic Moduli for Layered Media Based on Dynamic Deformation Analysis (Example of Highways)	1
Some Cases of Explicit Expression of the Intensity of the Resulting Field of Magnets Placed in the Field of External Sources	1
Characterization of Crack Damages in Composite Materials by Using Frequency- and Time-Domain Analysis	1
Characterization of Euphorbia Tortilis Cactus Concrete Specimen by 3D X-ray Tomography	1
Study on the Aging Degree of Historical Silk by the Surface Resistance Method	1
An Analytical Steady State Model of LCC Resonant Converter for X-ray Generator	1
Magnetic Analysis of Recrystallization Processes during Annealing of Cold-Deformed Nickel	1
Optical Testing of Degradation of Films of Polytetrafluoroethylene and Its Modification under Electron Irradiation	1
Study of Residual Welding Stresses for Underwater Wet Welding of Low-Alloy Steel Using Magnetic Anisotropic and X-ray Diffractometry Methods	1
Reconstructing the Image of Reflectors at Base-Metal–Weld Interface Using Ultrasonic Antenna Arrays	1
On Use of Slots in Modelling Cracks in Ultrasonic Testing	1
Features of Behavior of Magnetic Properties during Elastic Deformation of 20GN Hull Steel in Various Initial Stress–Strain States	1
On the Rational Choice of the Damper Shape for an Ultrasonic Piezoelectric Transducer	1
Features of Propagation of Lateral Transverse Ultrasonic Waves in a Flat Layer of Material	1
Testing Samples Made of Polymer Composite Materials Using Ultrasonic Antenna Arrays	1
Periodontitis Auxiliary Diagnosis Based on Deep Learning and Oral Dental X-ray Images	1
A New Look at the Controllability of Parts with Complex Configuration in Penetrant Testing	1
Technique for Analyzing Volumetric Defects Using Digital Elevation Model of a Surface	1
Study on Material Damage Characterization of High-Pressure Hydrogen Storage Vessels Based on DIC and Acoustic Emission Entropy	1
Changes in the Properties of Materials and Heat and Humidity Conditions for Long-Term Operation of Products and Diagnostics of the Dependence of Thermophysical Properties on Heating Rates	1
Hybrid Fuzzy Time Series Model and Data Fusion for Predicting Remaining Useful Life	1
Nondestructive Evaluation of Internal Cracks in Glass Fiber Reinforced Composites Using the Laser Shearing Interferometry Method	1
Sparse Optimal Design of Ultrasonic Phased Array for Efficient DMAS Imaging	1
Investigation of Density of Samples Made of Thermally Expanded Graphite by Acoustic Amplitude-Shadow Method	1
Measuring the Viscosity of Liquid Sulfur by Proton Microscopy	1
Erratum to: Method and Equipment for Infrared and Ultrasonic Thermographic Testing of Large-Sized Complex-Shaped Composite Products	1
Propagation of Love Waves in a Plane Layered Half-Space with Nonrigid Contact at the Boundaries	1
Multifrequency Eddy Current Testing of Structural Steel Sheets	1
Measurement of Dynamic Elastic Modulus and Poisson’s Ratio of Sugarcane Core by Cantilever Beam Vibration Method	1
A Novel Method to Identification Type, Location, and Extent of Transformer Winding Faults Based on FRA and SMOTE-SVM	1
A Technique for Practical Reconstruction of the Form Parameters of Surface Two-Dimensional Defects Taking into Account Nonlinear Properties of a Ferromagnet	1
Developing Methods and Devices for Ultrasonic Contactless Shadow Testing of Large-Sized Products Made of Polymer Composite Materials	1
A Practical and Precise Technique for Determination of Beta Emitter Source in Thickness Gauging of Thin Film	1
Hysteresis Interference of a Pulsed Magnetic Field in a Wave Transmitted through Metal	1
Thermal Nondestructive Testing: Development of Conventional Directions and New Trends (A Review)	1
Acoustic Characteristics of Solid Elastic Media with Oriented Microcracking	1
Possibilities for Testing Welded Joints of the Walls of Steel Tanks Using Ultrasonic and Eddy Current Methods	1
A Nondestructive Testing Method of Incremental Permeability Based on Permanent Magnet Movement Magnetization	1
Volume Fraction Detection of Long Period Stacking Ordered Phases in Mg Alloys Based on Dual-Tree Complex Wavelet Packet Transform	1
Laboratory Substantiation of Thermoelectric Method for Monitoring Contact Resistance	1
Thermal Testing of Corundum Ceramic Plates	1
One Approach to the Numerical Solution of the Basic Equation of Magnetostatics for a Finite Cylinder in an Arbitrary External Field	1
Detection and Evaluation of Dissimilar Metal Weld Defects Based on the Tx-Rx Pulsed Eddy Current Testing Probe	1
Thermal Flaw Detection Scanner for Testing Large-Sized Flat Products Made of Composite Materials	1
Investigating the Detectability of Surface Volumetric Defects in Ultrasonic Testing with the Use of Rayleigh Waves Generated by an Electromagnetic-Acoustic Transducer	1
Challenges Associated to Uultrasonic Techniques in Characterization of Friction Stir Weld Defects in 27 mm Thick Al 6061-O Plates	1
Evaluation of Heat Treatment Effect on the Tensile Strength of Mild Steel Welded Joints Using Ultrasonic Testing	1
Measuring the Acoustic Characteristics of Compact Concrete Building Structures Using the Impact Echo Method	1
Development of Approaches to Optical Diagnostics of Laser Weld Formation Process in Real Time Based on Laser Emission Spectroscopy	1
Evaluating Efficiency of Foreign Object Detection Technology Based on the Use of Passive Infrared Thermography	1
Nondestructive Detection of Wire Rope Damage Using Leakage Magnetic Technique based on Dual-Layer Sensors	1
Method for Solving Inverse Geometric Problem of Magnetostatics for Surface Defects of a Soft Magnetic Ferromagnet	1
Research on Direct Tensile Experiment of Rock-Concrete Interface Using Acoustic Emission Technology	1
Verification of a Technique for Reconstructing the Shape of Defects in Soft Magnetic Ferromagnets Using MFL Data	1
Quantitative Nondestructive Testing of Broken Wires for Wire Rope Based on Multi-Image Fusion	1
Field Test Method of the Resistance to Harmful Substances Intrusion of In-Service Marine Concrete Structures	1
Bearing Fault Feature Extraction Method Based on Variational Mode Decomposition of Fractional Fourier Transform	1
A Robust Approach for Locating and Assessing Mechanical Faults in an Actual Transformer Winding Using the State Space of Its Lumped Equivalent Model	1
Digital Coherent Signal Processing with Calculations in Frequency Domain for Solving Ultrasound Tomography Problems Using Matrix Antenna Arrays with Nonequidistant Arrangement of Elements	1