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Australasian Physical & Engineering Sciences in Medicine

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https://www.readbyqxmd.com/read/28105540/echocardiographic-assessment-of-long-term-hemodynamic-characteristics-of-mechanical-mitral-valve-prostheses-with-different-mitral-valvular-diseases
#1
Xiliang Zhu, Qian Li, Hong Tang, Xijun Xiao
Mitral stenosis (MS) and mitral insufficiency (MI) have different pre-operative hemodynamic characteristics. However, it is unclear if there are differences in long-term echocardiographic characteristics of MS and MI patients after mechanical mitral valve replacement. This study is to compare long-term echocardiographic results of mechanical mitral valve prostheses between MS and MI patients. From January 2003 to January 2009, a total of 199 consecutive patients were recruited in this study. Patients were classified as group MS (n = 123) and MI (n = 76) according to the manifestation of mitral valvular disease...
January 19, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28083852/dna-sensors-to-assess-the-effect-of-vkorc1-and-cyp2c9-gene-polymorphisms-on-warfarin-dose-requirement-in-chinese-patients-with-atrial-fibrillation
#2
Tao-Sheng Huang, Ling Zhang, Qiong He, Yu-Bin Li, Zhong-Li Dai, Jian-Rui Zheng, Pei-Qi Cheng, Yun-Shao He
The optimal dose of warfarin depends on polymorphisms in the VKORC1 (the vitamin K epoxide reductase complex subunit (1) and CYP2C9 (cytochrome P450 2C9) genes. To minimize the risk of adverse reactions, warfarin dosages should be adjusted according to results from rapid and simple monitoring methods. However, there are few pharmacogenetic-guided warfarin dosing algorithms that are based on large cohorts from the Chinese population, especially patients with atrial fibrillation. This study aimed to validate a pharmacogenetic-guided warfarin dosing algorithm based on results from a new rapid electrochemical detection method used in a multicenter study...
January 12, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28083851/the-influence-of-the-dose-calculation-resolution-of-vmat-plans-on-the-calculated-dose-for-eye-lens-and-optic-pathway
#3
Jong Min Park, So-Yeon Park, Jung-In Kim, Joel Carlson, Jin Ho Kim
To investigate the effect of dose calculation grid on calculated dose-volumetric parameters for eye lenses and optic pathways. A total of 30 patients treated using the volumetric modulated arc therapy (VMAT) technique, were retrospectively selected. For each patient, dose distributions were calculated with calculation grids ranging from 1 to 5 mm at 1 mm intervals. Identical structures were used for VMAT planning. The changes in dose-volumetric parameters according to the size of the calculation grid were investigated...
January 12, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28070749/an-automated-microemboli-detection-and-classification-system-using-backscatter-rf-signals-and-differential-evolution
#4
Karim Ferroudji, Nabil Benoudjit, Ayache Bouakaz
Embolic phenomena, whether air or particulate emboli, can induce immediate damages like heart attack or ischemic stroke. Embolus composition (gaseous or particulate matter) is vital in predicting clinically significant complications. Embolus detection using Doppler methods have shown their limits to differentiate solid and gaseous embolus. Radio-frequency (RF) ultrasound signals backscattered by the emboli contain additional information on the embolus in comparison to the traditionally used Doppler signals...
January 9, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28035635/ecg-signal-denoising-via-empirical-wavelet-transform
#5
Omkar Singh, Ramesh Kumar Sunkaria
This paper presents new methods for baseline wander correction and powerline interference reduction in electrocardiogram (ECG) signals using empirical wavelet transform (EWT). During data acquisition of ECG signal, various noise sources such as powerline interference, baseline wander and muscle artifacts contaminate the information bearing ECG signal. For better analysis and interpretation, the ECG signal must be free of noise. In the present work, a new approach is used to filter baseline wander and power line interference from the ECG signal...
December 29, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28005238/comparison-between-x-rays-spectra-and-their-effective-energies-in-small-animal-ct-tomographic-imaging-and-dosimetry
#6
Mahdjoub Hamdi, Malika Mimi, M'hamed Bentourkia
Small animal CT imaging and dosimetry usually rely on X-ray radiation produced by X-ray tubes. These X-rays typically cover a large energy range. In this study, we compared poly-energetic X-ray spectra against estimated equivalent (effective) mono-energetic beams with the same number of simulated photons for small animal CT imaging and dosimetry applications. Two poly-energetic X-ray spectra were generated from a tungsten anode at 50 and 120 kVp. The corresponding effective mono-energetic beams were established as 36 keV for the 50 kVp spectrum and 49...
December 22, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28005237/multiple-authorship-of-scientific-manuscripts
#7
EDITORIAL
Martin Caon
No abstract text is available yet for this article.
December 22, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28005236/author-index-volume-39
#8
(no author information available yet)
No abstract text is available yet for this article.
December 22, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27995545/validation-of-the-australian-diagnostic-reference-levels-for-paediatric-multi-detector-computed-tomography-a-comparison-of-ranzcr-qudi-data-and-subsequent-ndrls-data-from-2012-to-2015
#9
Hayton Anna, Anthony Wallace, Peter Thomas
The national diagnostic reference level service (NDRLS), was launched in 2011, however no paediatric data were submitted during the first calendar year of operation. As such, Australian national diagnostic reference levels (DRLs), for paediatric multi detector computed tomography (MDCT), were established using data obtained from a Royal Australian and New Zealand College of Radiologists (RANZCR), Quality Use of Diagnostic Imaging (QUDI), study. Paediatric data were submitted to the NDRLS in 2012 through 2015...
December 19, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27957703/epsm-2016-engineering-and-physical-sciences-in-medicine-6-10-november-2016-sydney-australia
#10
(no author information available yet)
No abstract text is available yet for this article.
December 12, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27943010/special-section-medical-imaging-and-insights-into-the-mechanics-of-heart-and-circulatory-physiology-and-dysfunction
#11
(no author information available yet)
No abstract text is available yet for this article.
December 9, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27943009/validation-of-the-mobius-system-for-patient-specific-quality-assurance-using-introduced-intentional-errors
#12
Ivy Win Long Au, Laura Ciurlionis, Neil Campbell, Daniel Goodwin
Mobius3D and MobiusFX are model-based verification tools for treatment plan dose calculation and treatment delivery. The software facilitates patient-specific quality assurance by extracting data from linear accelerator treatment log files and performing a 3D dose calculation on the original patient CT dataset using an independent collapsed cone algorithm. In this study, we evaluate the ability of the Mobius system to detect linear accelerator-related errors compared with existing measurement-based systems, namely the ArcCHECK(®) and 3DVH(®) systems...
December 9, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27914012/biomechanical-investigation-of-titanium-elastic-nail-prebending-for-treating-diaphyseal-long-bone-fractures
#13
Yen-Nien Chen, Pei-Yuan Lee, Chih-Wei Chang, Yi-Hung Ho, Yao-Te Peng, Chih-Han Chang, Chun-Ting Li
This study numerically investigated the deformation of titanium elastic nails prebent at various degrees during implantation into the intramedullary canal of fractured bones and the mechanism by which this prebending influenced the stability of the fractured bone. Three degrees of prebending the implanted portions of the nails were used: equal to, two times, and three times the diameter of the intramedullary canal. Furthermore, a simulated diaphyseal fracture with a 5-mm gap was created in the middle shaft portion of the bone fixed with two elastic nails in a double C-type configuration...
December 2, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27909886/automatic-snoring-sounds-detection-from-sleep-sounds-via-multi-features-analysis
#14
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
#15
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
#16
(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
#17
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
#18
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
#19
(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
#20
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
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