Effat Yahaghi

• PhD.
• scientific Staff at Imam Khomeini International University

The ancient gramophones have a special worthiness in culture and industry and protection of these gramophones is essential. To analyze the internal structure of a gramophone, we need some methods that give us good information without destruction and damage to our valuable objects. One of these non-destructive methods is radiography testing (RT). In...

Non-destructive tests are the most important and efficient tests for checking welded objects. Non-destructive tests are used to identify defects in the internal and external parts of welded objects, that focus on identifying defects of the parts without damaging them. In this article, the industrial radiography method, which is one of the non-destr...

Background The precise evaluation of tissue permeability using the Magnetic Resonance Imaging (MRI) method requires high-quality images. Due to noisy acquired dynamic MRI images, some methods of processing are required to obtain the imaging detail of interest. Objective This study aimed to implement Empirical Mode Decomposition (EMD) to the Lock-L...

Research subject: Polypropylene (PP) is a thermoplastic polymer that is used in a wide range of applications, including films and sheets, blow molding, injection molding, food packaging, textiles, laboratory and medical equipment, pipes, industrial and construction applications, and the manufacture of automotive components. In the applications of t...

Archeology is the scientific study of human activity through the recovery and analysis of the remained material culture. The prerequisite for the development of archeological knowledge in the country is access to equipped laboratories, hiring experienced specialists, and expanding national, and international cooperation. Due to rapid advances in in...

Confirmation of the integrity of welded pipes is of critical importance in the oil and gas industry and radiography testing (RT) is used as the gold standard for non-destructive testing (NDT) inspection. Radiography is based on the penetration of X-rays or gamma-rays through the object and the measurement of the intensity of the traversing radiatio...

Purpose: Cold Atmospheric Plasma (CAP) has a wide application in medicine that has many biological effects on bacterial, fungal, yeast, and mammalian cells, particularly cancer cells. In this study, the in-vivo anti-tumor effect of an Atmospheric Pressure Jet Plasma (APJP) source is investigated. Materials and Methods: The Glioblastoma Multiforme...

Radiography is a non-destructive tool and offers the acquisition of detailed information on the internal features of sculptures as a cultural heritage. However, radiographs contain different levels of blurriness mainly caused by the detection of scattered X-rays. Reduction of image blurriness provides improved contrast in targeted areas which enhan...

Plasma gliding-arc discharges is a non-equilibrium plasma that has many applications in research and industrial laboratories. Gliding plasma can be hot or cold plasma depending on the discharge power and gas flow rate, which leads to its various applications such as disinfection of fruits and vegetables, elimination of pollutant gases, increasing t...

Plasma, Polymer, Polyethylene, spectroscopy, positron lifetime spectroscopy H ypothesis: The use of plasma is widely used as a method to change polymer surfaces. The use of atmospheric cold plasma has more advantages than other plasma, laser and X-ray methods. This method is simple and it uses inexpensive equipment. Considering the many uses of pol...

The quality of welds is very important in some critical industries such as aeronautic manufacturing, pipelines, and civil construction. One of the most important weld inspections is industrial radiography testing. The quality of radiographic images may suffer from some level of blurriness due to poor signal-to-noise ratio, scattered X-rays, and oth...

Radiography testing (RT) is a well-established non-destructive method for the detection and measurement of defects in the welded objects. Unfortunately, however, the image quality of radiographs is often low mainly due to the unavoidable detection of scattered X-rays. This superimposed noise on the images could result in low detectability and inacc...

The radiography testing (RT) method is one of the most common tools used for the inspection of industrial specimens for defect detection. Although modern industrial radiography systems are capable of providing radiography images with a high dynamic range, the high sensitivity of their receptor and unfavorable exposure conditions could lead to high...

Art paintings are valuable cultural assets in any country that they are always threatened by dangers such as rupture, scratches, and loss of pigments. Natural disasters, irresponsible handling, exposure to light and temperature changes are all dangers factors. Various non-destructive methods such as radiography testing (RT) and ultraviolet (UV) ins...

Archaeologists and conservators have different problems in inspecting metal-type pieces extracted from the archaeological sites, such as their large number and the complexity of the materials and their shapes. Usually, all of the pieces are hidden under the oxidation layers. From this point of view, a non-destructive analysis technique such as digi...

The main defect types of historic-artistic paintings on wood are ruptures, scratches, twisting and such which may be inflicted by environment conditions, insects, dust, and dirt as well as by physical damage. The exact localization of the defects and determination of their extent may be achieved using industrial radiography as a non-destructive tes...

Non-destructive confirmation of seamless welding is of critical importance in most applications and digital industrial radiography (DIR) is often the method of choice for internal flaw detection. DIR images often suffer from fogginess, limiting the inspection of flawed regions in online and quantitative applications. Much focus has therefore been p...

Art paintings are valuable cultural assets in any country that they are always threatened by dangers such as rupture, scratches, and loss of pigments. Natural disasters, irresponsible handling, exposure to light and temperature changes are all dangers factors. Various non-destructive methods such as radiography testing (RT) and ultraviolet testing...

Cold plasma is a non-thermal method used to disinfect materials. High-energy electrons and oxidizing species are good at destroying microbes and environmental pollutants. Copper electrodes are used to produce plasma. To produce UV rays, ozone and hydroxyl radicals such as •H, ••O, ••OH radicals and H2O2, H2, O2 and O3 molecules that are effective i...

Artwork in museums is a major source of scientific, historical, and other research related to archeology. Different risks such as rupture, discoloration, and biodegradation threaten the paintings. Insects attack, natural disasters, and temperature changes are some other risk factors [1-3]. Preservation of art pieces is a very important and difficul...

Industrial radiography is considered as one of the most important nondestructive testing methods for different inspections. The radiography images often have a poor signal-to-noise ratio mainly because of the scattered X-rays. Image processing methods may be used to enhance the contrast of radiographs for better defect detection. In this study, out...

With ever-increasing demands on the security screening procedures, improved detection of items of concern inside the bags and luggage continues to attract considerable interest. In this study dual-energy, X-ray images have been used in combination with Gabor filter noise reduction with a view to improvements in object visualization and automated de...

The major defects in the artistic paints are rupture, scratches and twisting which are caused by changes in temperature, exposure to moisture and erosion. The detection of the defect locations can be carried out by industrial radiography, which is a non-destructive test. In radiography testing (RT), the produced radiographs may suffer from some deg...

X-rays and gamma rays are used in industrial radiography to detect internal defects and different structures of the test object. The radiography interpreters must be able to evaluate and interpret the radiography images as accurately as possible. To improve the operator’s image perception and interpretation, the quality of radiographs can be enhanc...

Aluminum casting is utilized for making complex objects. Different defects may, however, be introduced during the casting process; the detection of which relies on radiography testing as a standard inspection method. To improve information extraction from the acquired X-ray images, image processing methods are often necessary to improve the contras...

Weld quality inspection using industrial radiography is considered to be one of the most important processes in critical industries such as aeronautical manufacturing. The quality of radiographic images of welded industrial parts may suffer from poor signal-to-noise ratio (SNR), the main cause of which is the unavoidable detection of scattered X-ra...

عیوب عمده در تابلوهای هنری پوسیدگی، خراشیدگی، پارگی و... به دلیل تغییرات دما، رطوبت و سائیدگی می‌باشد. تشخیص دقیق محل آسیب توسط آزمون رادیوگرافی امکان پذیر است. بسیاری از تصاویر تهیه شده با رادیوگرافی صنعتی به دلیل پراکندگی ذاتی اشعه ایکس واضح نیستند و مات‌شدگی دارند که باعث عدم تشخیص محل عیوب می‌شود. دراین تحقیق از فیلترگابور که مبتنی بر تجزیه اطل...

Radiography testing (RT) is an effective, non-invasive method for the detection of hidden structures, details and fracture regions of valuable ancient ceramic objects. To maximize detail extraction from the radiographs and to better interpret images, we use an efficient image processing method that reveals the design and defect regions of objects....

Digital X-ray radiography is a well established method for non-destructive detection of corrosion and measurement of wall thickness of pipes. Due mainly to the unavoidable detection of scattered X-rays as well as the ever-present system electronic noise, the quality of the acquired radiographs is often low; the quality can however be enhanced by ap...

The recognition of damages and defects is very important in welded joints radiographic images. The experts’ evaluations of the weld images are dependent on both image quality and interpreter’s experience. This evaluation will become difficult if the radiography images have low quality and have been corrupted with noise and other quality decreasing...

The defect detection of welded objects is at the core of nondestructive testing and has found many applications in many industries. Industrial radiography is widely used for inspection of welded objects. In the low contrast radiography, image processing can assist to improve image quality. In this paper, an interlaced over complete wavelet expansio...

Industrial radiography can help to detect discontinuities in welded objects, but the technique suffers some major disadvantages related to fog and noise, and there is also a need to impose some further processing to detect the discontinuities in the images. The dynamic range of foggy radiographs is narrow, making it difficult to maximize the contra...

Positron Annihilation Lifetime and Doppler Broadening spectroscopy of positron annihilation radiation are performed in four different polymers. The size of elementary free volume sites and their chemical environments are determined. It is shown that polymers with different groups of C–H, CO, and C–F can be distinguished by their orbital electron mo...

The life of an aircraft depends on the early detection and removal of corrosion in its structure. The importance of detecting corrosion cannot be understated, because corrosion can cause other kinds of damage, such as cracks. Radiography is an important method for the detection of hidden defects in aircraft structure. To maximize information extrac...

Radiography is a technique to view the internal defect regions in the welded objects using X-rays or gamma rays Information extraction from the radiographs depends on the image quality and the interpreter's skill. Using the image enhancement methods is an important goal in industrial radiographic testing for contrast improvement of radiographs. In...

Recently, radiography image elaboration using different image processing methods has been introduced as an alternative to enhance the radiographs. The ability of improving the quality of an image depends on the scattered x-ray and the acquisition data by electronic system in digital radiography (DR) (RT). Iterative methods, well known in general sp...

The defect detection procedure of a radiographic image is a very important task. This is because of its importance regarding the safety of different industrial equipment. The defect detection procedures must reveal the defect region with the edges preserved. The radiography images are degraded by different noises caused by photon x-ray scattering,...

A three-step procedure is described which utilises wavelet de-noising, shape from shading (SFS) method and the Harris corner detector (HCD) for improved defect detection from radiographic images of welded objects. As the first step, the digitised radiographic images were processed using wavelet de-noising to remove the random high frequency noise o...

Radiography is often the method of choice for detection of hidden design details and defects in antique ceramic objects. To maximize information extraction from the images, as well as to optimize the operators’ image interpretation, the design and defect regions should be revealed. Development of effective image enhancement methods is an important...

Testing and detecting potential defects in works of art is usually required to cause minimal or no damage; industrial Radiography Testing (RT) is often the method of choice provided the images are of the required high quality and yield high defect detection sensitivity. Various digital image processing methods can be employed to achieve improved im...

Pipeline transportation systems for liquid anhydrous ammonia require periodic inspections for pipe defects. Defects such as crack-like flaws, including those due to stress corrosion and fatigue crack growth and fatigue of welded joints, can be tested by in situ radiography testing (RT). It is required that the detection technique should reveal the...

In this work, for better understanding of microvessels disorders, mass transfer at a stenotic and the straight capillary wall in the presence of RBC motion are investigated. The immersed boundary-lattice Boltzmann method is used for this purpose. The erythrocyte is considered as an immersed biconcave shaped tissue around the capillary as a porous m...

A new and rather accurate correlation for prediction of effective diffusion coefficient is proposed for the biological tissue in the brain. Blood flow in brain capillaries and mass diffusion process in the tissues as a porous media, surrounding the capillaries, are simulated by using the random nature of tissue structure and the lattice Boltzmann m...

In the present study, a new mathematical model for mass transfer in extra-vascular space is presented to indicate the effect of dead cells in infarcted tissues. This model is useful for predicting the results of experiments which are designed to distinguish normal from infarcted tissues and it can be used to approximate the percent of damaged cells...

Radiography is often the method of choice for detecting defects and damage in industrial objects. To optimise the operator's image perception and interpretation, and to improve the detection limit of the technique, the signal-to-noise ratio needs to be minimised. The development of effective image noise removal (denoising) algorithms, with highfreq...

Radiography is one of the oldest and most widely used of nondestructive testing techniques. Converting radiographs to a digital format and further digital image processing is the best method of enhancing the image quality and assisting the interpreter on his evaluation. In this study, the geometric locally adaptive sharpening method was used to imp...

Radiography images often are corrupted with some level of noise and the noise also can deterge the accuracy of corrosion dimension. One of the important methods in measurement of corrosion dimension is line density profile. The quality of profile density curve effect on measurement thickness. So, developing the efficient algorithms for noise remova...

In this research, radiography was utilised for identification of the design on an art-historical material. The subject was a brass tray belonging to Iran’s cultural heritage, with an estimated age of about 3500 years. The object was seriously damaged due to heavy corrosion attack and recognition of the object’s design was a major problem. Normal ra...

Radiography non-destructive testing method is one of the most important tools for aircraft maintenance procedures which can be effectively detect different kind of defects in aircraft structures. In this study, Computed Radiography (CR) testing method is used for defects detection in commercial aircrafts such as Falcon-20 and Fokker-100. Both conve...

Cracks are one of the most important flaws in the welding, which the mechanical strength of materials are significantly determined by existing cracks. Cracks usually appear due to physical stress when the weld cools. Industrial radiography is one of the most important non-destructive testing (NDT) methods which are used for flaw detection in the we...

Industrial radiography is one of the most important NDT methods to detect weld defects such as porosity, pinhole, bubble and crack. All these defects can be detected automatically and the weld defect can be characterized by the interpretation of radiographic images. If the provided images of the industrial radiography have not been clear, the detec...

Radiographic inspection is one of the most important techniques among non-destructive testing methods. Radiographic images are often very noisy and the image quality and the interpreter’s experience can affect the inspection of radiographs and their evaluation. In this research, principal component analysis (PCA) with local pixel grouping (LPG) alg...

The aircraft structures are made of aluminium alloys because of its various advantages, including ease of manufacture, high tolerance and ease of maintenance. Corrosions and cracks are often found in high-strength aluminium alloys. The industrial radiographic testing method and digital radiography are two most important tools for detecting differen...

This study improves the performance of primal–dual interior-point method in inverse conductivity problems via replacing the conventional, complicatedly calculated scalar regularization parameter with a diagonal matrix termed " multi-regularization parameter matrix " here. The solution of the PD–IPM depends considerably on the choice of the regulari...

The evaluation of defects and damage is very important in industrial radiography and the use of radiographic images in the detection and assessment of defects is very common. The image quality and the interpreter's experience affect the inspection of radiographs and their evaluation. Radiographic images are often very noisy and other methods of pro...

This study proposes a versatile criterion for estimating quality of images in electrical impedance tomography. The point spread function (PSF) is calculated throughout the domain based on the scattering of energy as responses to a small anomaly spirally moved from the centre to the boundary. The proposed PSF is a measure of weighted spatial varianc...

The bolus tracking data are quantified by perfusion and summary parameters when the tissue concentration-time curve and arterial input function vary with the infusion rate injection condition and patient physiology. A new approach based on the Monte Carlo simulation method was used to assess the errors introduced in perfusion summary parameters qua...

Nondestructive testing (NDT) is an important tool in the world of industry. Among different NDT methods, radiography plays a very interesting role both in industry and medicine. Medical and industrial uses of X and gamma rays were recognized since more than 1 century ago. One of the interesting uses of radiography is in archeological and art applic...

Digital radiography has been studied extensively for thickness measurement in recent years. This has resulted in enhanced image quality and improved overall evaluation. In this research, an innovative numerical method was used,for image enhancement and radiographic interpretation through the use of MATLAB software. Film digitising was carried out b...

This article presents a new method for estimating the leakage of a contrast agent out of a vessel. The proposed method is developed based on tissue homogeneity (TH) model, modified Patlak model, and Monte Carlo simulation. The analytical methods published in the literature estimate the contrast agent leakage by solving the coupled differential equa...

This work proposes a statistical approach for estimating blood brain barrier permeability. The statistical model simulates crossing of contrast agent according to permeability and lesions of blood brain barrier (BBB). It considers crossing of contrast agent through the capillary and BBB as intrinsically statistical processes and simulates it by Mon...

Analytical methods for solving adiabatic equations with non-uniform permeability and real arterial input function (AIF) are complicated. We consider crossing of contrast agent through the capillary and BBB as intrinsically statistical processes. Therefore, it is simulated by a stochastic method (Monte Carlo method). In our model, capillary is divid...

Introduction Given the number of possible combinations of different setting in radiotherapy such as the number of fields etc., arriving at an optimum treatment plan with a completely conventional solution would require an unacceptable number of iteration [1]. Using a priori information whether of a qualitative or quantitative nature has the potenti...

Introduction: The measurement of physiological parameters such as permeability of blood brain barrier (BBB) is an important area of research in MRI. To investigate the effect of exchange during bolus injection of a contrast agent, it is necessary to model the concentration of contrast agent within the capillary of BBB both as a function of time and...

Introduction Given the number of possible combinations of different setting in radiotherapy such as the number of fields etc., arriving at an optimum treatment plan with a completely conventional solution would require an unacceptable number of iteration [1]. Using a priori information whether of a qualitative or quantitative nature has the potenti...

Introduction: The measurement of physiological parameters such as permeability of blood brain barrier (BBB) is an important area of research in MRI. To investigate the effect of exchange during bolus injection of a contrast agent, it is necessary to model the concentration of contrast agent within the capillary of BBB both as a function of time and...

A method has been developed which, by using the geometric information from treatment sample cases, selects from a given data set an initial treatment plan as a step for treatment plan optimization. The method uses an artificial neural network (ANN) classification technique to select a best matching plan from the 'optimized' ANN database. Separate b...