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Australasian Physical & Engineering Sciences in Medicine

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https://www.readbyqxmd.com/read/27909886/automatic-snoring-sounds-detection-from-sleep-sounds-via-multi-features-analysis
#1
Can Wang, Jianxin Peng, Lijuan Song, Xiaowen Zhang
Obstructive sleep apnea hypopnea syndrome (OSAHS) is a serious respiratory disorder. Snoring is the most intuitively characteristic symptom of OSAHS. Recently, many studies have attempted to develop snore analysis technology for diagnosing OSAHS. The preliminary and essential step in such diagnosis is to automatically segment snoring sounds from original sleep sounds. This study presents an automatic snoring detection algorithm that detects potential snoring episodes using an adaptive effective-value threshold method, linear and nonlinear feature extraction using maximum power ratio, sum of positive/negative amplitudes, 500 Hz power ratio, spectral entropy (SE) and sample entropy (SampEn), and automatic snore/nonsnore classification using a support vector machine...
December 1, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27900621/an-assessment-of-radiation-oncology-medical-physicists-perspectives-on-undertaking-research
#2
Martin A Ebert, Georgia K B Halkett, Melissa Berg, David Cutt, Michael Davis, Desley Hegney, Michael House, Michele Krawiec, Rachel Kearvell, Leanne Lester, Sharon Maresse, Peter McLoone, Jan McKay
As part of a study of the radiation oncology workforce, radiation oncology medical physicists (ROMPs) who had worked in Australia were surveyed regarding their attitudes to participating in research. Responses from 88 ROMPs were available for analysis, representing a broad mix of employment situations and research experience. Greater than 70% of ROMPs described their involvement in research as "liking it" or "loving it", with associated identified benefits including skills development, job satisfaction and career progression...
November 29, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27900620/winning-images-from-the-photography-in-medical-physics-pimp-competition
#3
(no author information available yet)
No abstract text is available yet for this article.
November 29, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27896688/design-simulation-and-modelling-of-auxiliary-exoskeleton-to-improve-human-gait-cycle
#4
O Ashkani, A Maleki, N Jamshidi
Exoskeleton is a walking assistance device that improves human gait cycle through providing auxiliary force and transferring physical load to the stronger muscles. This device takes the natural state of organ and follows its natural movement. Exoskeleton functions as an auxiliary device to help those with disabilities in hip and knee such as devotees, elderly farmers and agricultural machinery operators who suffer from knee complications. In this research, an exoskeleton designed with two screw jacks at knee and hip joints...
November 28, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27896687/evaluation-of-the-influences-of-various-force-magnitudes-and-configurations-on-scoliotic-curve-correction-using-finite-element-analysis
#5
Mohammad Taghi Karimi, Mohammad Hossein Ebrahimi, Ali Mohammadi, Anthony McGarry
Scoliosis is a lateral curvature in the normally straight vertical line of the spine, and the curvature can be moderate to severe. Different treatment can be used based on severity and age of subjects, but most common treatment for this disease is using orthosis. To design orthosis types of force arrangement can be varied, from transverse loads to vertical loads or combination of them. But it is not well introduced how orthoses control scoliotic curve and how to achieve the maximum correction based on force configurations and magnitude...
November 28, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27878747/acknowledgement-of-apesm-reviewers-for-volume-39
#6
(no author information available yet)
No abstract text is available yet for this article.
November 23, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27873283/a-method-to-enhance-2d-ion-chamber-array-patient-specific-quality-assurance-for-imrt
#7
Rogelio Manuel Diaz Moreno, Daniel Venencia, Edgardo Garrigo, Yakov Pipman
Gamma index comparison has been established as a method for patient specific quality assurance in IMRT. Detector arrays can replace radiographic film systems to record 2D dose distributions and fulfill quality assurance requirements. These electronic devices present spatial resolution disadvantages with respect to films. This handicap can be partially overcome with a multiple acquisition sequence of adjacent 2D dose distributions. The detector spatial response influence can also be taken into account through the convolution of the calculated dose with the detector spatial response...
November 21, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27844331/multi-atlas-and-unsupervised-learning-approach-to-perirectal-space-segmentation-in-ct-images
#8
Soumya Ghose, James W Denham, Martin A Ebert, Angel Kennedy, Jhimli Mitra, Jason A Dowling
Perirectal space segmentation in computed tomography images aids in quantifying radiation dose received by healthy tissues and toxicity during the course of radiation therapy treatment of the prostate. Radiation dose normalised by tissue volume facilitates predicting outcomes or possible harmful side effects of radiation therapy treatment. Manual segmentation of the perirectal space is time consuming and challenging in the presence of inter-patient anatomical variability and may suffer from inter- and intra-observer variabilities...
November 14, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27832460/investigating-the-differences-of-body-mass-index-and-waist-circumference-in-the-follow-up-assessment-of-patients-to-cardiac-rehabilitation-with-acute-coronary-syndrome
#9
Hui Zhao, Jun Ma, Qiru Zhou, Wei Chen, Wei Zhu, Zekun Cai, Hongqiang Lei, Yu Deng, Lin Xu, Jian Qiu
Obesity management is a key point during cardiac rehabilitation. The effect of new index, waist circumference (WC), in the obesity management of cardiac rehabilitation is not clear yet. Therefore, our study compared the WC index to the body mass index (BMI) in the evaluation of obesity management for the patients with acute coronary syndrome (ACS) in a well-designed cardiac rehabilitation program (CRP). Totally 61 patients were enrolled into our study between October 2013 and January 2014 in our hospital. All these patients were requested to participate in the CRP actively for 6 months...
November 10, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27832459/the-impact-of-patient-table-on-size-specific-dose-estimate-ssde
#10
Choirul Anam, Freddy Haryanto, Rena Widita, Idam Arif, Geoff Dougherty, Donald McLean
The use of parameters water equivalent diameter (D W ) and size-specific dose estimate (SSDE) are becoming increasingly established as a recognised method to relate patient dose from a CT examination to the dose indicator volume CT dose index (CTDIVOL). However, the role of the attenuation due to the patient table in these estimations requires careful consideration and is the subject of this study. The aim of this study is to investigate the impact of a minimal part of the patient table when calculating the D W and SSDE...
November 10, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27815728/a-novel-algorithm-for-ventricular-arrhythmia-classification-using-a-fuzzy-logic-approach
#11
Nong Weixin
In the present study, it has been shown that an unnecessary implantable cardioverter-defibrillator (ICD) shock is often delivered to patients with an ambiguous ECG rhythm in the overlap zone between ventricular tachycardia (VT) and ventricular fibrillation (VF); these shocks significantly increase mortality. Therefore, accurate classification of the arrhythmia into VT, organized VF (OVF) or disorganized VF (DVF) is crucial to assist ICDs to deliver appropriate therapy. A classification algorithm using a fuzzy logic classifier was developed for accurately classifying the arrhythmias into VT, OVF or DVF...
November 4, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27815727/initial-experiments-with-gel-water-towards-mri-linac-dosimetry-and-imaging
#12
Sarah J Alnaghy, Maegan Gargett, Gary Liney, Marco Petasecca, Jarrad Begg, Anthony Espinoza, Matthew K Newall, Mitchell Duncan, Lois Holloway, Michael L F Lerch, Mircea Lazea, Anatoly B Rosenfeld, Peter Metcalfe
Tracking the position of a moving radiation detector in time and space during data acquisition can replicate 4D image-guided radiotherapy (4DIGRT). Magnetic resonance imaging (MRI)-linacs need MRI-visible detectors to achieve this, however, imaging solid phantoms is an issue. Hence, gel-water, a material that provides signal for MRI-visibility, and which will in future work, replace solid water for an MRI-linac 4DIGRT quality assurance tool, is discussed. MR and CT images of gel-water were acquired for visualisation and electron density verification...
November 4, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27787758/investigating-the-use-of-image-thresholding-in-brachytherapy-catheter-reconstruction
#13
Diana Binny, Craig M Lancaster, Tanya Kairn, Jamie V Trapp, Phil Back, Robyn Cheuk, Scott B Crowe
This study evaluated the accuracy of image thresholding in the reconstruction of catheters in brachytherapy treatment planning systems. Six test cases including four planar catheter configurations, an interstitial prostate and an intracavitary treatment plan were made use of in this study. The four planar CT scanned catheter arrangements included; catheters placed approximately 1, 0.5 cm apart, catheters closely arranged in a plan (<0.5 cm apart) and a loop arrangement. The intracavitary plan consisted of catheters arranged inside a mould configuration...
October 27, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27787757/sam-beddar-and-luc-beaulieu-eds-scintillation-dosimetry-crc-press-boca-raton-2016-isbn-978-1-4822-0899-3-rec-retail-price-%C3%A2-159-www-crcpress-com
#14
Alexandre M C Santos
No abstract text is available yet for this article.
October 27, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27766600/a-feature-study-of-innovative-high-speed-lancing-device-and-safety-lancet
#15
Ho Chang, Yao-Jen Yeh, Rahnfong Lee, Jenq-Huey Shyu
The study developed two models of an innovative high-speed lancing device and safety lancet, where the specially designed structure causes high-speed motion of the lancet, resulting in only one puncture of the skin. The two experimental models and other lancing devices sold on market were compared in order to: (1) measure the forces of lancets piercing animal skin by a load cell; (2) observe the wound areas caused by lancing devices under a microscope. The experimental results showed that, after using this innovative high-speed lancing device, the maximum force of a lancet piercing skin is only 1/3 of the force of conventional lancing devices, and the duration of the former under the skin is 1/6 of the latter...
October 20, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27743384/a-low-power-and-miniaturized-electrocardiograph-data-collection-system-with-smart-textile-electrodes-for-monitoring-of-cardiac-function
#16
Ming Dai, Xueliang Xiao, Xin Chen, Haoming Lin, Wanqing Wu, Siping Chen
With the increasing aging population as well as health concerns, chronic heart disease has become the focus of public attention. A comfortable, low-powered, and wearable electrocardiogram (ECG) system for continuously monitoring the elderly's ECG signals over several hours is important for preventing cardiovascular diseases. Traditional ECG monitoring apparatus is often inconvenient to carry, has many electrodes to attach to the chest, and has a high-power consumption. There is also a challenge to design an electrocardiograph that satisfies requirements such as comfort, confinement, and compactness...
October 14, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27730458/novel-application-of-3d-printing-in-brachytherapy-using-med610-3d-printed-insert-for-i-125-ropes-eye-plaque
#17
L Sim
The purpose of this study was to evaluate if MED610 3D printed material can be used as a surrogate for acrylic in the manufacturing of a replacement insert used in an eye plaque brachytherapy applicator. Measurement of the dose distributions from a standard acrylic insert were compared with dose obtained from MED610 3D printed replica using GafChromic(®) EBT3 films. The study used a 15 mm Radiation Oncology Physics and Engineering Services, Australia (ROPES) type eye plaque applicator loaded with I-125 (model 6711) seeds...
October 11, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27730457/results-from-a-phantom-based-multi-centre-paediatric-computed-tomography-dose-survey
#18
David L Thiele, Sarah-Ellyana Aliuddin, Mike Irvine, George P McGill
A computed tomography radiation dose survey was performed within our enterprise using three age-based paediatric phantoms representing a 1, 5 and 10 years old. Twenty-seven scanners were surveyed with volume computed tomography dose index and dose length product data collected for head, chest and abdomen-pelvis protocols at each age. Reconstruction method e.g. filtered back projection (FBP) or iterative (IR) was also recorded. About two-thirds of the 1 year old FBP chest scans exceeded the national Baby diagnostic reference level (DRL)...
October 11, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27718172/characterization-of-paraffin-based-breast-tissue-equivalent-phantom-using-a-cdte-detector-pulse-height-analysis
#19
Solen Cubukcu, Haluk Yücel
In this study, paraffin was selected as a base material and mixed with different amounts of CaSO4·2H2O and H3BO3 compounds in order to mimic breast tissue. Slab phantoms were produced with suitable mixture ratios of the additives in the melted paraffin. Subsequently, these were characterized in terms of first half-value layer (HVL) in the mammographic X-ray range using a pulse-height spectroscopic analysis with a CdTe detector. Irradiations were performed in the energy range of 23-35 kVp under broad beam conditions from Mo/Mo and Mo/Rh target/filter combinations...
October 7, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27658668/the-ups-and-downs-of-low-dose-ionising%C3%A2-radiobiology-research
#20
Pamela J Sykes
No abstract text is available yet for this article.
September 22, 2016: Australasian Physical & Engineering Sciences in Medicine
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