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Journal of Medical Signals and Sensors

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https://www.readbyqxmd.com/read/28553585/dosimetric-and-radiobiological-evaluation-of-multiparametric-mri-guided-dose-painting-in-radiotherapy-of-prostate-cancer
#1
Iraj Abedi, Mohammad B Tavakkoli, Keyvan Jabbari, Alireza Amouheidari, Ghasem Yadegarfard
Radiotherapy is one of the treatment options for locally advanced prostate cancer; however, with standard radiation doses, it is not always very effective. One of the strategies to improve the efficiency of radiotherapy is increasing the dose. In this study, to increase tumor local control rates, a new radiotherapy method, known as dose painting (DP), was investigated. To compare 3-dimensional conformal radiotherapy (3D-CRT) and intensity modulated radiotherapy (IMRT) plans with DP for prostate cancer. Twenty-four consecutive patients with locally advanced prostate cancer who underwent an multiparametric-magnetic resonance imaging (MP-MRI) (T2w, diffusion weighted image, dynamic contrast enhancement, and MRS) scan before a diagnostic biopsy from September 2015 to April 2016 were invited to take part in this study...
April 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28553584/an-approach-in-radiation-therapy-treatment-planning-a-fast-gpu-based-monte-carlo-method
#2
Mojtaba Karbalaee, Daryoush Shahbazi-Gahrouei, Mohammad B Tavakoli
An accurate and fast radiation dose calculation is essential for successful radiation radiotherapy. The aim of this study was to implement a new graphic processing unit (GPU) based radiation therapy treatment planning for accurate and fast dose calculation in radiotherapy centers. A program was written for parallel running based on GPU. The code validation was performed by EGSnrc/DOSXYZnrc. Moreover, a semi-automatic, rotary, asymmetric phantom was designed and produced using a bone, the lung, and the soft tissue equivalent materials...
April 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28553583/assessment-and-comparison-of-homogeneity-and-conformity-indexes-in-step-and-shoot-and-compensator-based-intensity-modulated-radiation-therapy-imrt-and-three-dimensional-conformal-radiation-therapy-3d-crt-in-prostate-cancer
#3
Marzieh Salimi, Kaveh Shirani Tak Abi, Hassan Ali Nedaie, Hossein Hassani, Hussain Gharaati, Mahmood Samei, Rezgar Shahi, Hamed Zarei
Intensity modulated radiation therapy (IMRT) and three-dimensional conformal radiation therapy (3D CRT) are two treatment modalities in prostate cancer, which provide acceptable dose distribution in tumor region with sparing the surrounding normal tissues. IMRT is based on inverse planning optimization; in which, intensity of beams is modified by using multileaf collimators and also compensators with optimum shapes in step and shoot (SAS) and compensator-based method, respectively. In the recent study, some important parameters were compared in two IMRT and 3D CRT methods...
April 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28553582/segmentation-of-white-blood-cells-from-microscopic-images-using-a-novel-combination-of-k-means-clustering-and-modified-watershed-algorithm
#4
Narjes Ghane, Alireza Vard, Ardeshir Talebi, Pardis Nematollahy
Recognition of white blood cells (WBCs) is the first step to diagnose some particular diseases such as acquired immune deficiency syndrome, leukemia, and other blood-related diseases that are usually done by pathologists using an optical microscope. This process is time-consuming, extremely tedious, and expensive and needs experienced experts in this field. Thus, a computer-aided diagnosis system that assists pathologists in the diagnostic process can be so effective. Segmentation of WBCs is usually a first step in developing a computer-aided diagnosis system...
April 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28553581/speckle-noise-reduction-in-optical-coherence-tomography-using-two-dimensional-curvelet-based-dictionary-learning
#5
Mahdad Esmaeili, Alireza Mehri Dehnavi, Hossein Rabbani, Fedra Hajizadeh
The process of interpretation of high-speed optical coherence tomography (OCT) images is restricted due to the large speckle noise. To address this problem, this paper proposes a new method using two-dimensional (2D) curvelet-based K-SVD algorithm for speckle noise reduction and contrast enhancement of intra-retinal layers of 2D spectral-domain OCT images. For this purpose, we take curvelet transform of the noisy image. In the next step, noisy sub-bands of different scales and rotations are separately thresholded with an adaptive data-driven thresholding method, then, each thresholded sub-band is denoised based on K-SVD dictionary learning with a variable size initial dictionary dependent on the size of curvelet coefficients' matrix in each sub-band...
April 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28553580/fast-and-efficient-four%C3%A2-class-motor-imagery-electroencephalography-signal-analysis-using-common-spatial-pattern-ridge-regression-algorithm-for-the-purpose-of-brain-computer-interface
#6
Sahar Seifzadeh, Mohammad Rezaei, Karim Faez, Mahmood Amiri
Brain-computer interfaces enable users to control devices with electroencephalographic (EEG) activity from the scalp or with single-neuron activity from within the brain. One of the most challenging issues in this regard is the balance between the accuracy of brain signals from patients and the speed of interpreting them into machine language. The main objective of this paper is to analyze different approaches to achieve the balance more quickly and in a better way. To reduce the ocular artifacts, the symmetric prewhitening independent component analysis (ICA) algorithm has been evaluated, which has the lowest runtime and lowest signal-to-interference (SIR) index, without destroying the original signal...
April 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28553579/optogenetics-tools-and-applications-in-neurobiology
#7
REVIEW
Parisa Mahmoudi, Hadi Veladi, Firooz G Pakdel
Comprehension of the brain function can be helpful for therapy of neurodegenerative diseases. The brain consists of various types of neuron sets, which organize in three-dimensional complex networks and form neural circuits underlying different behaviors. The circuits act based on the patterns that encode the brain functions. Recognition of the neural patterns requires methods to manipulate the neurons. Electrical stimulation may be the most common method. However, it has significant drawbacks including failure to identify specific neurons in experiments...
April 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28553578/a-comprehensive-study-of-retinal-vessel-classification-methods-in-fundus-images
#8
REVIEW
Maliheh Miri, Zahra Amini, Hossein Rabbani, Raheleh Kafieh
Nowadays, it is obvious that there is a relationship between changes in the retinal vessel structure and diseases such as diabetic, hypertension, stroke, and the other cardiovascular diseases in adults as well as retinopathy of prematurity in infants. Retinal fundus images provide non-invasive visualization of the retinal vessel structure. Applying image processing techniques in the study of digital color fundus photographs and analyzing their vasculature is a reliable approach for early diagnosis of the aforementioned diseases...
April 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28487834/effect-of-treadmill-training-protocols-on-locomotion-recovery-in-spinalized-rats
#9
Hamid R Kobravi, Ali Moghimi, Zahra Khodadadi
Both treadmill training and epidural stimulation can help to reactivate the central pattern generator (CPG) in the spinal cord after a spinal cord injury. However, designing an appropriate training approach and a stimulation profile is still a controversial issue. Since the spinal afferent signals are the input signals of CPG in the spinal cord, it can be concluded that the number of input afferent signals can affect the quality of movement recovery, such a phenomenon is in accordance with Hebbian theory. Therefore, at first in this paper, through some simulation studies on a model of CPGs, the effective influence of increasing the afferent input weight on activating CPG model was certified...
January 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28487833/quantification-of-left-ventricle-function-in-stress-echocardiography-using-endocardial-area-centroid-trajectory
#10
Mohammad Jalali, Hamid Behnam, Maryam Shojaeifard, Zahra A Sani
Coronary artery occlusion has a direct effect on cardiac activity and is a well-known reason for ventricular motion disorder, specifically left ventricle (LV) wall motion dysfunction. In stress echocardiography, wall motion abnormality is exaggerated when stress is applied to the heart, and therefore, it is easier to diagnose abnormality in ventricular motion. In this study, we have presented a new parameter that measures LV function. We have shown that LV function can be measured using a variation of endocard borders during a cardiac cycle in standard stress echocardiography frames...
January 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28487832/isfahan-misp-dataset
#11
Masoud Kashefpur, Rahele Kafieh, Sahar Jorjandi, Hadis Golmohammadi, Zahra Khodabande, Mohammadreza Abbasi, Nilufar Teifuri, Ali Akbar Fakharzadeh, Maryam Kashefpoor, Hossein Rabbani
An online depository was introduced to share clinical ground truth with the public and provide open access for researchers to evaluate their computer-aided algorithms. PHP was used for web programming and MySQL for database managing. The website was entitled "biosigdata.com." It was a fast, secure, and easy-to-use online database for medical signals and images. Freely registered users could download the datasets and could also share their own supplementary materials while maintaining their privacies (citation and fee)...
January 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28487831/a-new-parallel-approach-for-accelerating-the-gpu-based-execution-of-edge-detection-algorithms
#12
Zahra Emrani, Soroosh Bateni, Hossein Rabbani
Real-time image processing is used in a wide variety of applications like those in medical care and industrial processes. This technique in medical care has the ability to display important patient information graphi graphically, which can supplement and help the treatment process. Medical decisions made based on real-time images are more accurate and reliable. According to the recent researches, graphic processing unit (GPU) programming is a useful method for improving the speed and quality of medical image processing and is one of the ways of real-time image processing...
January 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28487830/automated-and-erp-based-diagnosis-of-attention-deficit-hyperactivity-disorder-in-children
#13
Hossein R Jahanshahloo, Mousa Shamsi, Elham Ghasemi, Abolfazl Kouhi
Event-related potential (ERP) is one of the most informative and dynamic methods of monitoring cognitive processes, which is widely used in clinical research to deal with a variety of psychiatric and neurological disorders such as attention-deficit/hyperactivity disorder (ADHD). In this study, there were 60 participants including 30 patients with ADHD and 30 subjects as a control group. Their ERP signals were recorded by three electrodes in two modalities. After a preprocessing step, several features such as band power, fractal dimension, autoregressive (AR) model coefficients and wavelet coefficients were extracted from recorded signals...
January 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28487829/multi-parametric-improvements-in-the-ccd-camera-based-epid-for-portal-dosimetry
#14
Vahideh Nazari, Seied R Mahdavi, Ahmad Mostaar, Hassan Nedaei, Mohammad A Mosleh Shirazi, Alireza Nikoofar, Golbarg Esmailie
Dosimetric verification of radiation treatment has recently been extended by the introduction of electronic portal imaging devices (EPIDs). Detailed dose response specifications of EPID should be addressed prior to any dosimetric application. The present study evaluates improvements of dosimetric properties of the low elbow camera-based EPID Theraview (Cablon Medical, Leusden, The Netherlands) equipped with a cooled charge coupled device (CCD) for portal dosimetry. The dose response, warm-up behavior, stability over long- and short-term scales (throughout a day) were studied...
January 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28487828/predictive-control-of-the-blood-glucose-level-in-type-i-diabetic-patient-using-delay-differential-equation-wang-model
#15
Mojgan Esna-Ashari, Maryam Zekri, Masood Askari, Noushin Khalili
Because of increasing risk of diabetes, the measurement along with control of blood sugar has been of great importance in recent decades. In type I diabetes, because of the lack of insulin secretion, the cells cannot absorb glucose leading to low level of glucose. To control blood glucose (BG), the insulin must be injected to the body. This paper proposes a method for BG level regulation in type I diabetes. The control strategy is based on nonlinear model predictive control. The aim of the proposed controller optimized with genetics algorithms is to measure BG level each time and predict it for the next time interval...
January 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28487827/an-automatic-prolongation-detection-approach-in-continuous-speech-with-robustness-against-speaking-rate-variations
#16
Iman Esmaili, Nader Jafarnia Dabanloo, Mansour Vali
In recent years, many methods have been introduced for supporting the diagnosis of stuttering for automatic detection of prolongation in the speech of people who stutter. However, less attention has been paid to treatment processes in which clients learn to speak more slowly. The aim of this study was to develop a method to help speech-language pathologists (SLPs) during diagnosis and treatment sessions. To this end, speech signals were initially parameterized to perceptual linear predictive (PLP) features...
January 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28028501/aptamer-conjugated-magnetic-nanoparticles-as-targeted-magnetic-resonance-imaging-contrast-agent-for-breast-cancer
#17
Mohammad Keshtkar, Daryoush Shahbazi-Gahrouei, Seyyed Mehdi Khoshfetrat, Masoud A Mehrgardi, Mahmoud Aghaei
Early detection of breast cancer is the most effective way to improve the survival rate in women. Magnetic resonance imaging (MRI) offers high spatial resolution and good anatomic details, and its lower sensitivity can be improved by using targeted molecular imaging. In this study, AS1411 aptamer was conjugated to Fe3O4@Au nanoparticles for specific targeting of mouse mammary carcinoma (4T1) cells that overexpress nucleolin. In vitro cytotoxicity of aptamer-conjugated nanoparticles was assessed on 4T1 and HFFF-PI6 (control) cells...
October 2016: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28028500/effects-of-nano-biphasic-calcium-phosphate-composite-on-bioactivity-and-osteoblast-cell-behavior-in-tissue-engineering-applications
#18
Mehdi Ebrahimian-Hosseinabadi, Mohammadreza Etemadifar, Fakhredin Ashrafizadeh
In this paper, preparation, bioactivity, and osteoblast cell behavior of cortical bone derived nano-biphasic calcium phosphate (nano-BCP) are presented. The calcined bovine bone samples with the addition of di-ammonium hydrogen phosphate were heated at 700°C for 100 min, and thus nano-BCP with the composition of 63/37 hydroxyapatite (HA)/β-tricalcium phosphate (β-TCP) was produced. Scanning electron microscopy (SEM) images, energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) analysis of immersed samples in simulated body fluid (SBF) solution showed that a uniform layer was formed on the surface after 7 days with the chemical composition of HA...
October 2016: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28028499/barrett-s-mucosa-segmentation-in-endoscopic-images-using-a-hybrid-method-spatial-fuzzy-c-mean-and-level-set
#19
Hossein Yousefi-Banaem, Hossein Rabbani, Peyman Adibi
Barrett's mucosa is one of the most important diseases in upper gastrointestinal system that caused by gastro-esophagus reflux. If left untreated, the disease will cause distal esophagus and gastric cardia adenocarcinoma. The malignancy risk is very high in short segment Barrett's mucosa. Therefore, lesion area segmentation can improve specialist decision for treatment. In this paper, we proposed a combined fuzzy method with active models for Barrett's mucosa segmentation. In this study, we applied three methods for special area segmentation and determination...
October 2016: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28028498/human-verification-using-a-combination-of-static-and-dynamic-characteristics-in-foot-pressure-images
#20
Fereshteh E Zare, Keivan Maghooli
Since gait is the mixture of many complex movements, each individual can define with a unique foot pressure image that can be used as a reliable biometric scale for human verification. Foot pressure color images of Center for Biometrics and Security Research (CBSR) dataset from 45 men and 5 women were used in this study. Owing to the properties of this dataset, an index of foot pressure in addition to external feature and contourlet coefficient of images was extracted. A multilayer perceptron (MLP) was utilized for verification of subjects (it is a common practice to explain more about the training and test dataset)...
October 2016: Journal of Medical Signals and Sensors
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