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Australasian Physical & Engineering Sciences in Medicine

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https://www.readbyqxmd.com/read/28914430/position-paper-recommendations-for-a-digital-mammography-quality-assurance-program%C3%A2-v4-0
#1
J C P Heggie, P Barnes, L Cartwright, J Diffey, J Tse, J Herley, I D McLean, F J Thomson, R K Grewal, L T Collins
In 2001 the ACPSEM published a position paper on quality assurance in screen film mammography which was subsequently adopted as a basis for the quality assurance programs of both the Royal Australian and New Zealand College of Radiologists (RANZCR) and of BreastScreen Australia. Since then the clinical implementation of digital mammography has been realised and it has become evident that existing screen-film protocols were not appropriate to assure the required image quality needed for reliable diagnosis or to address the new dose implications resulting from digital technology...
September 15, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28887797/cell-shaped-silicon-on-insulator-microdosimeters-characterization-and-response-to-239-pube-irradiations
#2
Anthony Mazza, Wayne Newhauser, Stephen Pittman, Andrew Halloran, Paul Maggi, Linh Tran, Brent Gila, Anatoly Rosenfeld, James Ziegler
This work tested the feasibility of a silicon-on-insulator microdosimeter, which mimics the size and shape of specific cells within the human body, to determine dose equivalent from neutron irradiation. The microdosimeters were analyzed in terms of their basic diode characteristics, i.e., leakage current as a function of bias voltage. Lineal energy spectra were acquired using two different converter layers placed atop the microdosimeter: a tissue-substitute converter made from high-density polyethylene, and a boron converter consisting of epoxy coated with boron powder...
September 8, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28887765/heartbeat-detection-in-multimodal-physiological-signals-using-signal-quality-assessment-based-on-sample-entropy
#3
Omkar Singh, Ramesh Kumar Sunkaria
This paper presents a novel technique to identify heartbeats in multimodal data using electrocardiogram (ECG) and arterial blood pressure (ABP) signals. Multiple physiological signals such as ECG, ABP, and Respiration are often recorded in parallel from the activity of heart. These signals generally possess related information as they are generated by the same physical system. The ECG and ABP correspond to the same phenomenon of contraction and relaxation activity of heart. Multiple signals acquired from various sensors are generally processed independently, thus discarding the information from other measurements...
September 8, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28887746/diagnosis-of-multiple-sclerosis-from-eeg-signals-using-nonlinear-methods
#4
Ali Torabi, Mohammad Reza Daliri, Seyyed Hojjat Sabzposhan
EEG signals have essential and important information about the brain and neural diseases. The main purpose of this study is classifying two groups of healthy volunteers and Multiple Sclerosis (MS) patients using nonlinear features of EEG signals while performing cognitive tasks. EEG signals were recorded when users were doing two different attentional tasks. One of the tasks was based on detecting a desired change in color luminance and the other task was based on detecting a desired change in direction of motion...
September 8, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28871513/winning-images-from-the-photography-in-medical-physics-pimp-competition
#5
(no author information available yet)
No abstract text is available yet for this article.
September 4, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28871483/a-comprehensive-dose-assessment-of-irradiated-hand-by-iridium-192-source-in-industrial-radiography
#6
S M Hosseini Pooya, M R Dashtipour, R Paydar, F Mianji, B Pourshahab
Among the various incidents in industrial radiography, inadvertent handling of sources by hands is one of the most frequent incidents in which some parts of the hands may be locally exposed to high doses. An accurate assessment of extremity dose assists medical doctors in selecting appropriate treatments, preventing the injury expansion in the region. In this study, a phantom was designed to simulate a fisted hand of a radiographer when the worker holds a radioactive source in their hands. The local doses were measured using implanted TLDs in the phantom at different distances from a source...
September 4, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28861861/gate-monte-carlo-simulation-of-dose-distribution-using-mapreduce-in-a-cloud-computing-environment
#7
Yangchuan Liu, Yuguo Tang, Xin Gao
The GATE Monte Carlo simulation platform has good application prospects of treatment planning and quality assurance. However, accurate dose calculation using GATE is time consuming. The purpose of this study is to implement a novel cloud computing method for accurate GATE Monte Carlo simulation of dose distribution using MapReduce. An Amazon Machine Image installed with Hadoop and GATE is created to set up Hadoop clusters on Amazon Elastic Compute Cloud (EC2). Macros, the input files for GATE, are split into a number of self-contained sub-macros...
August 31, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28852988/best-of-both-worlds
#8
EDITORIAL
Stéphanie Corde
No abstract text is available yet for this article.
August 29, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28852979/estimation-of-effective-brain-connectivity-with-dual-kalman-filter-and-eeg-source-localization-methods
#9
Mehdi Rajabioun, Ali Motie Nasrabadi, Mohammad Bagher Shamsollahi
Effective connectivity is one of the most important considerations in brain functional mapping via EEG. It demonstrates the effects of a particular active brain region on others. In this paper, a new method is proposed which is based on dual Kalman filter. In this method, firstly by using a brain active localization method (standardized low resolution brain electromagnetic tomography) and applying it to EEG signal, active regions are extracted, and appropriate time model (multivariate autoregressive model) is fitted to extracted brain active sources for evaluating the activity and time dependence between sources...
August 29, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28831682/differences-in-grip-force-control-between-young-and-late-middle-aged-adults
#10
Lianrong Zheng, Kunyang Li, Qian Wang, Wenhui Chen, Rong Song, Guanzheng Liu
Grip force control is a crucial function for human to guarantee the quality of life. To examine the effects of age on grip force control, 10 young adults and 11 late middle-aged adults participated in visually guided tracking tasks using different target force levels (25, 50, and 75% of the subject's maximal grip force). Multiple measures were used to evaluate the tracking performance during force rising phase and force maintenance phase. The measurements include the rise time, fuzzy entropy, mean force percentage, coefficient of variation, and target deviation ratio...
August 22, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28819817/estimation-of-entrance-surface-air-kerma-due-to-diagnostic-x-ray-examinations-of-adult-patients-in-uttarakhand-india-and-establishment-of-local-diagnostic-reference-levels
#11
Satish C Uniyal, Vineet Chaturvedi, Sunil D Sharma, Shailendra Raghuvanshi
It is well established that diagnostic X-ray practices must be optimised to keep patient radiation dose as low as compatible with providing the diagnostic information required. For effective optimisation of diagnostic exposures, the International Commission on Radiological Protection (ICRP) introduced the concept of diagnostic reference levels (DRLs) in 1996. The present study aimed to carry out an extensive dose survey of diagnostic radiography installations in the Uttarakhand region of India to establish local DRL Values for the different diagnostic practices...
August 17, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28808904/measurement-of-dose-in-radionuclide-therapy-by-using-cerenkov-radiation
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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