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Australasian Physical & Engineering Sciences in Medicine

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https://www.readbyqxmd.com/read/28808904/measurement-of-dose-in-radionuclide-therapy-by-using-cerenkov-radiation
#1
Yao Ai, Xiaobin Tang, Diyun Shu, Wencheng Shao, Chunhui Gong, Changran Geng, Xudong Zhang, Haiyan Yu
This work aims to determine the relationship between Cerenkov photon emission and radiation dose from internal radionuclide irradiation. Water and thyroid phantoms were used to simulate the distribution of Cerenkov photon emission and dose deposition through Monte Carlo method. The relationship between Cerenkov photon emission and dose deposition was quantitatively analyzed. A neck phantom was also used to verify Cerenkov photon detection for thyroid radionuclide therapy. Results show that Cerenkov photon emission and dose deposition exhibit the same distribution pattern in water phantom, and this relative distribution relationship also existed in the thyroid phantom...
August 14, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28762027/a-simple-and-efficient-algorithm-operating-with-linear-time-for-mceeg-data-compression
#2
Geevarghese Titus, M S Sudhakar
Popularisation of electroencephalograph (EEG) signals in diversified fields have increased the need for devices capable of operating at lower power and storage requirements. This has led to a great deal of research in data compression, that can address (a) low latency in the coding of the signal, (b) reduced hardware and software dependencies, (c) quantify the system anomalies, and (d) effectively reconstruct the compressed signal. This paper proposes a computationally simple and novel coding scheme named spatial pseudo codec (SPC), to achieve lossy to near lossless compression of multichannel EEG (MCEEG)...
July 31, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28762026/feasibility-of-3d-printed-air-slab-diode-caps-for-small-field-dosimetry
#3
Benjamin Perrett, Paul Charles, Tim Markwell, Tanya Kairn, Scott Crowe
Commercial diode detectors used for small field dosimetry introduce a field-size-dependent over-response relative to an ideal, water-equivalent dosimeter due to high density components in the body of the detector. An air gap above the detector introduces a field-size-dependent under-response, and can be used to offset the field-size-dependent detector over-response. Other groups have reported experimental validation of caps containing air gaps for use with several types of diodes in small fields. This paper examines two designs for 3D printed diode air caps for the stereotactic field diode (SFD)-a cap containing a sealed air cavity, and a cap with an air cavity at the face of the SFD...
July 31, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28752321/a-new-scoring-system-for-evaluating-coronary-artery-disease-by-using-blood-pressure-variability
#4
Wei Zhu, Jian Qiu, Liheng Ma, Hongqiang Lei, Zekun Cai, Hui Zhao, Yu Deng, Jun Ma, Lin Xu
The aim of this study was to develop a new scoring system using ambulatory blood pressure monitoring (ABPM) to assist in the evaluation of coronary artery disease (CAD). One hundred twenty-five subjects (53.1 ± 9.6 years of age) were included. Pearson's tests were first performed to identify the parameters that correlated with Duke Treadmill Score (DTS). Blood test parameters and blood pressure variability (BPV) measures that were extracted from the ABPM were included. Next, a multiple linear regression analysis was performed to train a new scoring system in the 84 patients from the 125 patients...
July 27, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28752320/polymer-gel-dosimeters-with-pva-ga-matrix
#5
Seyed Mohammad Mahdi Abtahi, Hamid Sadeghi Abandansari
Properties of a new polymer gel with cross-linked polyvinyl alcohol as a gelatinous matrix were investigated. The new polymer gel dosimeter was named PVABAT. The irradiation was performed using a calibrated (60)Co beam. The dose responses of the PVABAT formulations were quantified with MRI transverse relaxation rate (R2) measurements. The results show that the PVABAT gel responds linearly to the absorbed dose for doses from 30 up to 45 Gy. The maximal amount of [Formula: see text] of PVABAT polymer gel dosimeter was about 0...
July 27, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28752319/lower-limb-muscle-activity-during-gait-in-individuals-with-hearing-loss
#6
Mahdi Majlesi, Elaheh Azadian, Nader Farahpour, Amir Ali Jafarnezhad, Hosein Rashedi
The objective of this study was to investigate the electrical activity of lower limb muscles during gait in an able-bodied control group and in deaf individuals. Thirty male children were equally divided into a control group and a group of deaf children. A portable EMG system was used to record the activity of the bilateral tibialis anterior, gastrocnemius medialis and vastus lateralis muscles during barefoot walking with and without dual task. For EMG analysis, the average root mean square (RMS) values of the five trials were calculated and then normalized based on the peak RMS obtained by the maximum isometric voluntary contraction...
July 27, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28733932/a-new-algorithm-for-ecg-interference-removal-from-single-channel-emg-recording
#7
Shayan Yazdani, Mahmood Reza Azghani, Mohammad Hossein Sedaaghi
This paper presents a new method to remove electrocardiogram (ECG) interference from electromyogram (EMG). This interference occurs during the EMG acquisition from trunk muscles. The proposed algorithm employs progressive image denoising (PID) algorithm and ensembles empirical mode decomposition (EEMD) to remove this type of interference. PID is a very recent method that is being used for denoising digital images mixed with white Gaussian noise. It detects white Gaussian noise by deterministic annealing. To the best of our knowledge, PID has never been used before, in the case of EMG and ECG separation or in other 1D signal denoising applications...
July 21, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28717902/fusion-of-heart-rate-variability-and-pulse-rate-variability-for-emotion-recognition-using-lagged-poincare-plots
#8
Atefeh Goshvarpour, Ataollah Abbasi, Ateke Goshvarpour
Designing an efficient automatic emotion recognition system based on physiological signals has attracted great interests within the research of human-machine interactions. This study was aimed to classify emotional responses by means of a simple dynamic signal processing technique and fusion frameworks. The electrocardiogram and finger pulse activity of 35 participants were recorded during rest condition and when subjects were listening to music intended to stimulate certain emotions. Four emotion categories, including happiness, sadness, peacefulness, and fear were chosen...
July 17, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28717901/performance-assessment-of-a-programmable-five-degrees-of-freedom-motion-platform-for-quality-assurance-of-motion-management-techniques-in-radiotherapy
#9
Chen-Yu Huang, Paul Keall, Adam Rice, Emma Colvill, Jin Aun Ng, Jeremy T Booth
Inter-fraction and intra-fraction motion management methods are increasingly applied clinically and require the development of advanced motion platforms to facilitate testing and quality assurance program development. The aim of this study was to assess the performance of a 5 degrees-of-freedom (DoF) programmable motion platform HexaMotion (ScandiDos, Uppsala, Sweden) towards clinically observed tumor motion range, velocity, acceleration and the accuracy requirements of SABR prescribed in AAPM Task Group 142...
July 17, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28685485/operational-statistics-for-the-apesm-journal-2014-2016
#10
EDITORIAL
Martin Caon
No abstract text is available yet for this article.
July 6, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28677081/the-role-of-impairment-of-mesenchymal-stem-cell-function-in-osteoporotic-bone-fracture-healing
#11
Lihai Zhang, Saeed Miramini, Martin Richardson, Priyan Mendis, Peter Ebeling
With demographic change and increasing life expectancy, osteoporotic fractures have become one of the most prevalent trauma conditions seen in daily clinical practice. A variety of factors are known to affect the rate of healing in osteoporotic conditions (e.g. both biochemical and biomechanical environment of callus cells). However, the influence of impairment of mesenchymal stem cell function in the osteoporotic condition on bone fracture healing has not been fully understood. In the present study, we develop a mathematical model that quantifies the change in biological processes within the fracture callus as a result of osteoporosis...
July 4, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28653146/investigation-of-the-optimum-heel-pad-stiffness-a-modeling-study
#12
Che-Yu Lin, Hung-Jui Chuang, Daniel H Cortes
Due to the controversy regarding the criterion for diagnosing heel pad (HP) pathology based on evaluating the state of the heel pad stiffness (HPS), this paper intended to apply modeling to understand the influence of the HPS on the mechanical responses of the HP at heelstrike during locomotion, in an attempt to investigate the optimum HPS in terms of the health-related mechanical responses. Two different models, a finite element model and a classical mechanical model, were used to simulate the mechanical responses (force loading and deformation) experienced by the HP at heelstrike...
June 26, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28620839/probability-density-distribution-of-delta-rr-intervals-a-novel-method-for-the-detection-of-atrial-fibrillation
#13
Yanjun Li, Xiaoying Tang, Ancong Wang, Hui Tang
Atrial fibrillation (AF) monitoring and diagnosis require automatic AF detection methods. In this paper, a novel image-based AF detection method was proposed. The map was constructed by plotting changes of RR intervals (△RR) into grid panes. First, the map was divided into grid panes with 20 ms fixed resolution in y-axes and 15-60 s step length in x-axes. Next, the blank pane ratio (BPR), the entropy and the probability density distribution were processed using linear support-vector machine (LSVM) to classify AF and non-AF episodes...
June 15, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28608296/erratum-to-short-tangential-arcs-in-vmat-based-breast-and-chest-wall-radiotherapy-lead-to-conformity-of-the-breast-dose-with-lesser-cardiac-and-lung-doses-a-prospective-study-of-breast-conservation-and-mastectomy-patients
#14
Anusheel Munshi, Biplab Sarkar, Satheeshkumar Anbazhagan, Upendra K Giri, Harpreet Kaur, Kanan Jassal, Tharmar Ganesh, Bidhu Kalyan Mohanti
No abstract text is available yet for this article.
June 12, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28597230/both-sides-now-diagnostic-imaging-medical-physics-in-two-hemispheres
#15
EDITORIAL
Donald McRobbie
No abstract text is available yet for this article.
June 8, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28573545/a-software-framework-for-real-time-multi-modal-detection-of-microsleeps
#16
Simon J Knopp, Philip J Bones, Stephen J Weddell, Richard D Jones
A software framework is described which was designed to process EEG, video of one eye, and head movement in real time, towards achieving early detection of microsleeps for prevention of fatal accidents, particularly in transport sectors. The framework is based around a pipeline structure with user-replaceable signal processing modules. This structure can encapsulate a wide variety of feature extraction and classification techniques and can be applied to detecting a variety of aspects of cognitive state. Users of the framework can implement signal processing plugins in C++ or Python...
June 1, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28555426/a-novel-approach-to-the-extraction-of-fetal-electrocardiogram-based-on-empirical-mode-decomposition-and-correlation-analysis
#17
Peyman Ghobadi Azbari, Mostafa Abdolghaffar, Saeed Mohaqeqi, Mohammad Pooyan, Alireza Ahmadian, Niloofar Ghanbarzadeh Gashti
Fetal heart rate monitoring is the process of checking the condition of the fetus during pregnancy and it would allow doctors and nurses to detect early signs of trouble during labor and delivery. The fetal ECG (FECG) signal is so weak and also is corrupted by other signals and noises, mainly by maternal ECG signal. It is so hard to acquire a noise-free, precise and reliable FECG using the conventional methods. In this study, a combination of empirical mode decomposition (EMD) algorithms, correlation and match filtering is used for extracting FECG from maternal abdominal ECG signals...
May 29, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28597229/couch-modelling-for-volumetric-modulated-arc-therapy-vmat
#18
Te-Yu Chyou, Friedlieb Lorenz
The aim of this work was to investigate the impact of the accuracy of a certain couch model on the overall accuracy of the dose calculation. For this purpose two models of the Varian Exact Couch (Varian Medical Systems, Palo Alto, CA, USA) for use in the planning of volumetric modulated arc therapy (VMAT) were created in Monaco 5.1 (Elekta, Stockholm, Sweden). The first was a simplistic model, with the relative electron densities (ED) of structures based entirely on CT Hounsfield units (HU). The second couch model was obtained by assigning the appropriate EDs to the relevant couch structures...
June 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28523470/short-tangential-arcs-in-vmat-based-breast-and-chest-wall-radiotherapy-lead-to-conformity-of-the-breast-dose-with-lesser-cardiac-and-lung-doses-a-prospective-study-of-breast-conservation-and-mastectomy-patients
#19
Anusheel Munshi, Biplab Sarkar, Anbu Sateeshkumar, Upendra K Giri, Harpreet Kaur, Kanan Jassal, Tharmar Ganesh, Bidhu Kalyan Mohanti
Volumetric modulated arc therapy (VMAT) is modern rotational intensity modulated therapy used for treatment of several sites. The study aimed to analyze partial tangential arc VMAT treatment planning and delivery, including analyzing the cardiac and contralateral breast doses resulting from this technique. A total of 153 consecutively treated breast cancer (conservation as well as mastectomy) patients were taken for this dosimetric study. All patients were planned using partial arc VMAT in the Monaco treatment planning system using two partial arc beams...
May 18, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28523469/system-for-automatic-heart-rate-calculation-in-epileptic-seizures
#20
Marcin Kołodziej, Andrzej Majkowski, Remigiusz J Rak, Bartosz Świderski, Andrzej Rysz
This article presents a comprehensive system for automatic heart rate (HR) detection. The system is robust and resistant to disturbances (noise, interferences, artifacts) occurring mainly during epileptic seizures. ECG signal filtration (IIR) and normalization due to skewness and standard deviation were used as preprocessing steps. A key element of the system is a reference QRS complex pattern calculated individually for each ECG recording. Next, a cross-correlation of the reference QRS pattern with short, normalized ECG windows is calculated and the maxima of the correlation are found (R-wave locations)...
May 18, 2017: Australasian Physical & Engineering Sciences in Medicine
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