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Journal of Medical Signals and Sensors

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https://www.readbyqxmd.com/read/29928637/dental-segmentation-in-cone-beam-computed-tomography-images-using-watershed-and-morphology-operators
#1
Somayeh Kakehbaraei, Hadi Seyedarabi, Ali Taghavi Zenouz
Teeth segmentation is an important task in computer-aided procedures and clinical diagnosis. In this paper, we propose an accurate and robust algorithm based on watershed and morphology operators for teeth and pulp segmentation and a new approach for enamel segmentation in cone-beam computed tomography (CBCT) images. Proposed method consists of five steps: acquiring appropriate CBCT image, image enhancement, teeth segmentation using the marker-controlled watershed (MCW), enamel segmentation by global threshold, and finally, utilizing the MCW for pulp segmentation...
April 2018: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29928636/solvothermal-synthesis-of-magnetic-spinel-ferrites
#2
REVIEW
Mohammad Rafienia, Ashkan Bigham, Seyed Ali Hassanzadeh-Tabrizi
At present, solvothermal fabrication method has widely been applied in the synthesis of spinel ferrite nanoparticles (SFNs), which is mainly because of its great advantages such as precise control over size, shape distribution, and high crystallinity that do not require postannealing treatment. Among various SFNs, Fe3 O4 nanoparticles have attracted tremendous attention because of their favorable physical and structural properties which are advantageous, especially in biomedical applications, among which the vast application of these materials as targeted drug delivery systems, hyperthermia, and imaging agents in cancer therapy can be mentioned...
April 2018: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29928635/comparison-of-acetate-butyrate-and-acetate-ethanol-metabolic-pathway-in-biohydrogen-production
#3
Ensiyeh Taheri, Mohammad Mehdi Amin, Hamidreza Pourzamani, Ali Fatehizadeh, Mohammad Ghasemian, Bijan Bina
Background: Hydrogen gas is the cleanest energy carrier and could be produced by biological process. Dark fermentation is one of the biohydrogen production methods that carried out just on organic wastes conversion. Methods: In this study, the batch tests were conducted to compare the biohydrogen production and glucose fermentation via acetate-butyrate and acetate-ethanol metabolic pathway induced by NaOH and KOH (10 M) pretreatment. In batch test, the glucose concentration in the feed was varied from 3...
April 2018: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29928634/evaluation-of-targeted-image-guided-radiation-therapy-treatment-planning-system-by-use-of-american-association-of-physicists-in-medicine-task-group-119-test-cases
#4
Mohsen Saeb, Daryoush Shahbazi-Gahrouei, Shahram Monadi
Background: This study aimed to evaluate the overall accuracy of the beam commissioning criteria of targeted image-guided radiation therapy (TiGRT) treatment planning system (TPS) based on the American Association of Physicists in Medicine (AAPM) Task Group Report 119 (TG-119). Methods: The work was performed using 6 MV energy LINAC with a variable dose rate of 200 MU/min which equipped with the high-quality external TiGRT dynamic multileaf collimator model H. The AAPM TG-119 intensity-modulated radiation therapy (IMRT) commissioning tests are composed of two preliminary tests and four clinical test cases...
April 2018: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29928633/evaluation-of-electroencephalogram-signals-of-the-professional-pianists-during-iconic-memory-and-working-memory-tests-using-spectral-coherence
#5
Seyedeh Yasamin Boutorabi, Ali Sheikhani
Background: Today, the neuroscience has growth in many aspects, and the effects of different factors on memory obtained many achievements. Several scientific and experimental studies evaluated effects of music on style and behavior of people; in this study, we evaluated memory between two groups of people, the professional pianists and normal people, through processing their electroencephalogram (EEG) signals using the coherence measure. Methods: In this study, EEG signals from 17 subjects during two memory tasks were recorded...
April 2018: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29928632/pencil-beam-fluence-evaluation-based-on-monte-carlo-simulations-algorithm-of-high-energetic-treatment-photons
#6
Hossam Donya
Background: The accurate calculation of doses during external radiotherapy sessions is necessary. Recently, the models used for this purpose have been the point kernel, pencil-beam, and collapsed cone superposition/convolution combination models. Methods: In this study, it is aimed to determine point/pencil-beam kernels to be used in dose calculations. For this purpose, tallying pencil-beam fluence based on Monte Carlo (MC) simulations is investigated by scoring a volume of interest centered in a cubic water phantom at a depth of 10 cm and the irradiated field of 10 cm × 10 cm...
April 2018: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29928631/diffusion-tensor-magnetic-resonance-imaging-strategies-for-color-mapping-of-human-brain-anatomy
#7
Saïd Boujraf
Background: A color mapping of fiber tract orientation using diffusion tensor imaging (DTI) can be prominent in clinical practice. The goal of this paper is to perform a comparative study of visualized diffusion anisotropy in the human brain anatomical entities using three different color-mapping techniques based on diffusion-weighted imaging (DWI) and DTI. Methods: The first technique is based on calculating a color map from DWIs measured in three perpendicular directions...
April 2018: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29928630/a-classification-system-for-assessment-and-home-monitoring-of-tremor-in-patients-with-parkinson-s-disease
#8
Omid Bazgir, Seyed Amir Hassan Habibi, Lorenzo Palma, Paola Pierleoni, Saba Nafees
Background: Tremor is one of the most common symptoms of Parkinson's disease (PD), which is widely being used in the diagnosis procedure. Accurate estimation of PD tremor based on Unified PD Rating Scale (UPDRS) provides aid for physicians in prescription and home monitoring. This article presents a robust design of a classification system to estimate PD patient's hand tremors and the results of the proposed system as compared to the UPDRS. Methods: A smartphone accelerometer sensor is used for accurate and noninvasive data acquisition...
April 2018: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29535926/assessment-of-effective-dose-associated-with-coronary-computed-tomography-angiography-in-isfahan-province-iran
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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