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Journal of Medical Signals and Sensors

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https://www.readbyqxmd.com/read/29535926/assessment-of-effective-dose-associated-with-coronary-computed-tomography-angiography-in-isfahan-province-iran
#1
Mohammadbagher Tavakoli, Reihane Faraji, Zahra Alirezaei, Zohre Nateghian
Computed tomography coronary angiography (CTCA) has generated a great interest over the past two decades, due to its high diagnostic accuracy and efficacy in the assessment of patients having coronary artery disease. This method is associated with high radiation dose and this has raised serious concerns in the literature. Effective dose (E) is a single parameter meant to reflect the relative risk from exposure to ionizing radiation. Therefore, it is necessary to calculate this parameter to indicate ionizing radiation relative risk...
January 2018: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29535925/designing-an-inverter-based-operational-transconductance-amplifier-capacitor-filter-with-low-power-consumption-for-biomedical-applications
#2
Sajad Yousefinezhad, Saeed Kermani, Saeed Hosseinnia
The operational transconductance amplifier-capacitor (OTA-C) filter is one of the best structures for implementing continuous-time filters. It is particularly important to design a universal OTA-C filter capable of generating the desired filter response via a single structure, thus reducing the filter circuit power consumption as well as noise and the occupied space on the electronic chip. In this study, an inverter-based universal OTA-C filter with very low power consumption and acceptable noise was designed with applications in bioelectric and biomedical equipment for recording biomedical signals...
January 2018: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29535924/characterization-of-silk-poly-3-hydroxybutyrate-chitosan-multi-walled-carbon-nanotube-micro-nano-scaffold-a-new-hybrid-scaffold-for-tissue-engineering-applications
#3
Mohammad Hossein Mirmusavi, Saeed Karbasi, Dariush Semnani, Anousheh Zargar Kharazi
Background: Long-term healing tissue engineering scaffolds must hold its full mechanical strength at least for 12 weeks. Nano-micro scaffolds consist of electrospinning nanofibers and textile microfibers to support cell behavior and mechanical strength, respectively. Methods: The new nano-micro hybrid scaffold was fabricated by electrospinning poly 3-hydroxybutyrate-chitosan-multi-walled carbon nanotube (MWNT functionalized by COOH) solution on knitted silk in a random manner with different amounts of MWNT...
January 2018: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29535923/assessment-of-imprecise-small-photon-beam-modeling-by-two-treatment-planning-system-algorithms
#4
Hadi Keivan, Daryoush Shahbazi-Gahrouei, Ahmad Shanei, Alireza Amouheidari
Background: Dosimetric accuracy in intensity-modulated radiation therapy (IMRT) is the main part of quality assurance program. Improper beam modeling of small fields by treatment planning system (TPS) can lead to inaccuracy in treatment delivery. This study aimed to evaluate of the dose delivery accuracy at small segments of IMRT technique using two-dimensional (2D) array as well as evaluate the capability of two TPSs algorithm in modeling of small fields. Methods: Irradiation were performed using 6 MV photon beam of Siemens Artiste linear accelerator...
January 2018: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29535922/evaluating-the-impact-of-various-parameters-on-the-gamma-index-values-of-2d-diode-array-in-imrt-verification
#5
Keyvan Jabbari, Fakhereh Pashaei, Mohammad R Ay, Alireza Amouheidari, Mohammad B Tavakoli
Background: MapCHECK2 is a two-dimensional diode arrays planar dosimetry verification system. Dosimetric results are evaluated with gamma index. This study aims to provide comprehensive information on the impact of various factors on the gamma index values of MapCHECK2, which is mostly used for IMRT dose verification. Methods: Seven fields were planned for 6 and 18 MV photons. The azimuthal angle is defined as any rotation of collimators or the MapCHECK2 around the central axis, which was varied from 5 to -5°...
January 2018: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29535921/markerless-respiratory-tumor-motion-prediction-using-an-adaptive-neuro-fuzzy-approach
#6
Nima Rostampour, Keyvan Jabbari, Mahdad Esmaeili, Mohammad Mohammadi, Shahabedin Nabavi
Background: Accurate delivery of the prescribed dose to moving lung tumors is a key challenge in radiation therapy. Tumor tracking involves real-time specifying the target and correcting the geometry to compensate for the respiratory motion, that's why tracking the tumor requires caution. This study aims to develop a markerless lung tumor tracking method with a high accuracy. Methods: In this study, four-dimensional computed tomography (4D-CT) images of 10 patients were used, and all the slices which contained the tumor were contoured for all patients...
January 2018: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29535920/metal-artifact-suppression-in-dental-cone-beam-computed-tomography-images-using-image-processing-techniques
#7
Masoumeh Johari, Milad Abdollahzadeh, Farzad Esmaeili, Vahideh Sakhamanesh
Background: Dental cone beam computed tomography (CBCT) images suffer from severe metal artifacts. These artifacts degrade the quality of acquired image and in some cases make it unsuitable to use. Streaking artifacts and cavities around teeth are the main reason of degradation. Methods: In this article, we have proposed a new artifact reduction algorithm which has three parallel components. The first component extracts teeth based on the modeling of image histogram with a Gaussian mixture model...
January 2018: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29535919/improving-classification-of-cancer-and-mining-biomarkers-from-gene-expression-profiles-using-hybrid-optimization-algorithms-and-fuzzy-support-vector-machine
#8
Niloofar Yousefi Moteghaed, Keivan Maghooli, Masoud Garshasbi
Background: Gene expression data are characteristically high dimensional with a small sample size in contrast to the feature size and variability inherent in biological processes that contribute to difficulties in analysis. Selection of highly discriminative features decreases the computational cost and complexity of the classifier and improves its reliability for prediction of a new class of samples. Methods: The present study used hybrid particle swarm optimization and genetic algorithms for gene selection and a fuzzy support vector machine (SVM) as the classifier...
January 2018: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29204383/hand-arm-vibration-effects-on-performance-tactile-acuity-and-temperature-of-hand
#9
Farhad Forouharmajd, Mehrdad Yadegari, Masoumeh Ahmadvand, Farshad Forouharmajd, Siamak Pourabdian
Effects of vibration appear as mechanical and psychological disorders, including stress reactions, cognitive and movement disorders, problem in concentration and paying attention to the assigned duties. The common signs and symptoms of hand-arm vibration (HAV) in the fingers and hands may appear as pins and needles feeling, tingling, numbness, and also the loss of finger sensation and dexterity. Laboratory Virtual Instrument Engineering Workbench programming software designed for occupational vibrations measurement was used to calculate HAV acceleration...
October 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29204382/effect-of-material-and-wall-thickness-buildup-caps-on-the-head-scatter-factor-measurements-in-irregular-fields-shielded-by-cerrobend
#10
Ali Jomehzadeh, Daryoush Shahbazi-Gahrouei, Vahid Jahanbakhsh
The head scatter factor ( Sc ) is important to measurements radiation beam and beam modeling of treatment planning systems used for advanced radiation therapy techniques. This study aimed to investigate the design of a miniphantom to measurement variations in collimator Sc in the presence of shielding blocks for shaping the beam using different field sizes. Copper, Brass, and Perspex buildup caps were designed and fabricated locally as material with three different thicknesses for buildup caps (miniphantoms)...
October 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29204381/a-fuzzy-controller-for-movement-stabilization-using-afferent-control-controller-synthesis-and-simulation
#11
Zahra Khodadadi, Hamid R Kobravi, Milad F Majd
Stimulation of spinal sensorimotor circuits can improve motor control in animal models and humans with spinal cord injury (SCI). More recent evidence suggests that the stimulation increases the level of excitability in the spinal circuits, activates central pattern generators, and it is also able to recruit distinctive afferent pathways connected to specific sensorimotor circuits. In addition, the stimulation generates well-defined responses in leg muscles after each pulse. The problem is that in most of the neuromodulation devices, electrical stimulation parameters are regulated manually and stay constant during movement...
October 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29204380/electrospun-polycaprolactone-lignin-based-nanocomposite-as-a-novel-tissue-scaffold-for-biomedical-applications
#12
Mohammad Ali Salami, Faranak Kaveian, Mohammad Rafienia, Saeed Saber-Samandari, Amirsalar Khandan, Mitra Naeimi
Background: Biopolymer scaffolds have received great interest in academic and industrial environment because of their supreme characteristics like biological, mechanical, chemical, and cost saving in the biomedical science. There are various attempts for incorporation of biopolymers with cheap natural micro- or nanoparticles like lignin (Lig), alginate, and gums to prepare new materials with enhanced properties. Methods: In this work, the electrospinning (ELS) technique as a promising cost-effective method for producing polymeric scaffold fibers was used, which mimics extracellular matrix structure for soft tissue engineering applications...
October 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29204379/the-best-texture-features-for-leukocytes-recognition
#13
Omid Sarrafzadeh, Alireza M Dehnavi, Hossein Y Banaem, Ardeshir Talebi, Arshin Gharibi
Background: Differential counting of white blood cells (WBCs or leukocytes) is a common task to diagnose many diseases such as leukemia, and infections. An accurate process for recognizing leukocytes is to evaluate a blood smear under a microscope by an expert. Since, this procedure is manual, time-consuming and tedious, making the procedure automatic would overcome these problems. In an automated CAD (Computer-Aided-Design) system for this purpose, a crucial module is leukocytes recognition...
October 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29204378/circular-mitochondrial-dna-a-geant4-dna-user-application-for-evaluating-radiation-induced-damage-in-circular-mitochondrial-dna
#14
Mohammad Bagher Tavakoli, Habiballah Moradi, Hossein Khanahmad, Mohsen Hosseini
Background: The aim of this study was to develop a nucleotide geometrical model of the circular mitochondrial DNA (mt-DNA) structure using Geant4-DNA toolkit to predict the radiation-induced damages such as single-strand breaks (SSB), double-strand breaks (DSB), and some other physical parameters. Methods: Our model covers the organization of a circular human mt genetic system. The current model includes all 16,659 base pairs of human mt-DNA. This new mt-DNA model has been preliminarily tested in this work by determining SSB and DSB DNA damage yields and site-hit probabilities due to the impact of proton particles...
October 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29204377/detection-of-pulmonary-nodules-in-low-dose-computed-tomography-using-localized-active-contours-and-shape-features
#15
Zahra Nadealian, Behzad Nazari, Saeid Sadri, Mohammad Momeni
Background: Pulmonary nodules are symptoms of lung cancer. The shape and size of these nodules are used to diagnose lung cancer in computed tomography (CT) images. In the early stages, nodules are very small, and radiologist has to refer to many CT images to diagnose the disease, causing operator mistakes. Image processing algorithms are used as an aid to detect and localize nodules. Methods: In this paper, a novel lung nodules detection scheme is proposed. First, in the preprocessing stage, our algorithm segments two lung lobes to increase processing speed and accuracy...
October 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29204376/mobile-cardiac-health-care-monitoring-and-notification-with-real-time-tachycardia-and-bradycardia-arrhythmia-detection
#16
Mina Golzar, Faranak Fotouhi-Ghazvini, Hossein Rabbani, Fahimeh Sadat Zakeri
Background: The increasing trend of heart disease has turned the attention of researchers toward the use of portable connected technologies. The necessity of continuous special care for cardiovascular patients is an inevitable fact. Methods: In this research, a new wireless electrocardiographic (ECG) signal-monitoring system based on smartphone is presented. This system has two main sections. The first section consists of a sensor which receives ECG signals via an amplifier, then filters and digitizes the signal, and prepares it to be transmitted...
October 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28840120/optical-ring-resonators-a-platform-for-biological-sensing-applications
#17
Azadeh Kiani Sarkaleh, Babak Vosoughi Lahijani, Hamidreza Saberkari, Ali Esmaeeli
Rapid advances in biochemistry and genetics lead to expansion of the various medical instruments for detection and prevention tasks. On the other hand, food safety is an important concern which relates to the public health. One of the most reliable tools to detect bioparticles (i.e., DNA molecules and proteins) and determining the authenticity of food products is the optical ring resonators. By depositing a recipient polymeric layer of target particle on the periphery of an optical ring resonator, it is possible to identify the existence of molecules by calculating the shift in the spectral response of the ring resonators...
July 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28840119/the-correction-of-focal-point-displacement-caused-by-the-refraction-of-the-beams-in-high-intensity-focused-ultrasound
#18
Mohammad Rezaei, Karim Khoshgard, Mehdi Mousavi
Nowadays, high-intensity focused ultrasound (HIFU) as nonionizing radiation is used for cancer treatment. Basically, the function of HIFU is similar to conventional ultrasound. Ultrasound beams are perverted when crossing the border of different environments. This decreases the beam's focus within the tumor and may induce damage to the normal tissues. In this study, we aim to develop appropriate algorithms for correcting the focal point displacement duced by the beam's refraction. First, the level of displacement due to difference in two specific tissues was calculated for one element of the transducer and, then, it extended to all of the elements...
July 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28840118/designing-an-optimized-novel-femoral-stem
#19
Parto Babaniamansour, Mehdi Ebrahimian-Hosseinabadi, Anousheh Zargar-Kharazi
BACKGROUND: After total hip arthroplasty, there would be some problems for the patients. Implant loosening is one of the significant problems which results in thigh pain and even revision surgery. Difference between Young's modulus of bone-metal is the cause of stress shielding, atrophy, and subsequent implant loosening. MATERIALS AND METHODS: In this paper, femoral stem stiffness is reduced by novel biomechanical and biomaterial design which includes using proper design parameters, coating it with porous surface, and modeling the sketch by the software...
July 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28840117/a-new-energy-efficient-topology-for-wireless-body-area-networks
#20
Ameneh Rostampour, Neda Moghim, Marjan Kaedi
Wireless body area networks consist of several devices placed on the human body, sensing vital signs and providing remote recognition of health disorders. Low power consumption is crucial in these networks. A new energy-efficient topology is provided in this paper, considering relay and sensor nodes' energy consumption and network maintenance costs. In this topology design, relay nodes, placed on the cloth, are used to help the sensor nodes forwarding data to the sink. Relay nodes' situation is determined such that the relay nodes' energy consumption merges the uniform distribution...
July 2017: Journal of Medical Signals and Sensors
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