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Australasian Physical & Engineering Sciences in Medicine

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https://www.readbyqxmd.com/read/29774461/nonlinear-analysis-of-electrodermal-activity-signals-for-healthy-subjects-and-patients-with-chronic-obstructive-pulmonary-disease
#1
Serife Gokce Caliskan, Mehmet Dincer Bilgin, Mehmet Polatli
It is known that signals recorded from physiological systems represent nonlinear features. Several recent studies report that quantitative information about signal complexity is obtained by using nonlinear analysis algorithms. Chronic obstructive pulmonary disease (COPD) is one of the causes of mortality worldwide with an increasing prevalence. This study aims to investigate nonlinear parameters such as largest Lyapunov exponent (LLE) and correlation dimension of electrodermal activity signals recorded from healthy subjects and patients with COPD...
May 17, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29774460/multi-layer-cube-sampling-for-liver-boundary-detection-in-pet-ct-images
#2
Xinxin Liu, Jian Yang, Shuang Song, Hong Song, Danni Ai, Jianjun Zhu, Yurong Jiang, Yongtian Wang
Liver metabolic information is considered as a crucial diagnostic marker for the diagnosis of fever of unknown origin, and liver recognition is the basis of automatic diagnosis of metabolic information extraction. However, the poor quality of PET and CT images is a challenge for information extraction and target recognition in PET-CT images. The existing detection method cannot meet the requirement of liver recognition in PET-CT images, which is the key problem in the big data analysis of PET-CT images. A novel texture feature descriptor called multi-layer cube sampling (MLCS) is developed for liver boundary detection in low-dose CT and PET images...
May 17, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29756166/dosimetric-characterisation-of-the-optically-stimulated-luminescence-dosimeter-in-cobalt-60-high-dose-rate-brachytherapy-system
#3
M Rejab, J H D Wong, Z Jamalludin, W L Jong, R A Malik, W Z Wan Ishak, N M Ung
This study investigates the characteristics and application of the optically-stimulated luminescence dosimeter (OSLD) in cobalt-60 high dose rate (HDR) brachytherapy, and compares the results with the dosage produced by the treatment planning system (TPS). The OSLD characteristics comprised linearity, reproducibility, angular dependence, depth dependence, signal depletion, bleaching rate and cumulative dose measurement. A phantom verification exercise was also conducted using the Farmer ionisation chamber and in vivo diodes...
May 13, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29756165/study-on-the-dose-modification-factor-of-strut-adjusted-volume-implant-savi-with-a-169-yb-source-using-mcnp4c
#4
Seyed Milad Vahabi, Mostean Bahreinipour, Mojtaba Shamsaie Zafarghandi
The SAVI has gained widespread use for accelerated partial breast irradiation (APBI) brachytherapy. Treatments with SAVI produce inherent heterogeneities including variable backscatter due to proximity to the tissue-air interface and variable cavity contents, causing inaccuracy in the dose calculation. In this study, a model of SAVI with sources of 169 Yb developed recently was defined and simulations with MCNP4C code of Monte Carlo were performed through different scenarios to assess the effects of these heterogeneities on the dose distribution...
May 13, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29744809/identification-of-a-feature-selection-based-pattern-recognition-scheme-for-finger-movement-recognition-from-multichannel-emg-signals
#5
Geethanjali Purushothaman, Raunak Vikas
This paper focuses on identification of an effective pattern recognition scheme with the least number of time domain features for dexterous control of prosthetic hand to recognize the various finger movements from surface electromyogram (EMG) signals. Eight channels EMG from 8 able-bodied subjects for 15 individuals and combined finger activities have been considered in this work. In this work, an attempt has been made to recognize a number of classes with the least number of features. Therefore, EMG signals are pre-processed using dual tree complex wavelet transform to improve the discriminating capability of features and time domain features such as zero crossing, slope sign change, mean absolute value, and waveform length is extracted from the pre-processed data...
May 9, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29737492/drivers-of-change
#6
EDITORIAL
Lisa Wilfert
No abstract text is available yet for this article.
May 8, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29737491/computed-tomography-imaging-with-the-adaptive-statistical-iterative-reconstruction-asir-algorithm-dependence-of-image-quality-on-the-blending-level-of-reconstruction
#7
Patrizio Barca, Marco Giannelli, Maria Evelina Fantacci, Davide Caramella
Computed tomography (CT) is a useful and widely employed imaging technique, which represents the largest source of population exposure to ionizing radiation in industrialized countries. Adaptive Statistical Iterative Reconstruction (ASIR) is an iterative reconstruction algorithm with the potential to allow reduction of radiation exposure while preserving diagnostic information. The aim of this phantom study was to assess the performance of ASIR, in terms of a number of image quality indices, when different reconstruction blending levels are employed...
May 8, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29736636/the-effect-of-work-system-on-the-hand-exposure-of-workers-in-18-f-fdg-production-centres
#8
Małgorzata Wrzesień
The production of the 18 F isotope-the marker of deoxyglucose (18 F-FDG)-the radiopharmaceutical most commonly used in the oncological diagnostic technique of positron emission tomography, requires a cyclotron device. At present, there are nine facilities working in Poland that are equipped with cyclotrons used for producing the short-lived isotopes. The aim of the paper is to determine the hand exposure of workers employed in the two 18 F-FDG production centres taking in to account the production procedures and work system in those facilities...
May 7, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29717432/classifying-dysmorphic-syndromes-by-using-artificial-neural-network-based-hierarchical-decision-tree
#9
Merve Erkınay Özdemir, Ziya Telatar, Osman Eroğul, Yusuf Tunca
Dysmorphic syndromes have different facial malformations. These malformations are significant to an early diagnosis of dysmorphic syndromes and contain distinctive information for face recognition. In this study we define the certain features of each syndrome by considering facial malformations and classify Fragile X, Hurler, Prader Willi, Down, Wolf Hirschhorn syndromes and healthy groups automatically. The reference points are marked on the face images and ratios between the points' distances are taken into consideration as features...
May 1, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29687436/alexander-fractional-differential-window-filter-for-ecg-denoising
#10
Atul Kumar Verma, Indu Saini, Barjinder Singh Saini
The electrocardiogram (ECG) non-invasively monitors the electrical activities of the heart. During the process of recording and transmission, ECG signals are often corrupted by various types of noises. Minimizations of these noises facilitate accurate detection of various anomalies. In the present paper, Alexander fractional differential window (AFDW) filter is proposed for ECG signal denoising. The designed filter is based on the concept of generalized Alexander polynomial and the R-L differential equation of fractional calculus...
April 23, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29687435/winning-images-from-the-photography-in-medical-physics-pimp-competition
#11
(no author information available yet)
No abstract text is available yet for this article.
April 23, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29667117/ecg-derived-respiration-based-on-iterated-hilbert-transform-and-hilbert-vibration-decomposition
#12
Hemant Sharma, K K Sharma
Monitoring of the respiration using the electrocardiogram (ECG) is desirable for the simultaneous study of cardiac activities and the respiration in the aspects of comfort, mobility, and cost of the healthcare system. This paper proposes a new approach for deriving the respiration from single-lead ECG based on the iterated Hilbert transform (IHT) and the Hilbert vibration decomposition (HVD). The ECG signal is first decomposed into the multicomponent sinusoidal signals using the IHT technique. Afterward, the lower order amplitude components obtained from the IHT are filtered using the HVD to extract the respiration information...
April 17, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29654522/a-prospective-case-study-of-high-boost-high-frequency-emphasis-and-two-way-diffusion-filters-on-mr-images-of-glioblastoma-multiforme
#13
B N Anoop, Justin Joseph, J Williams, J Sivaraman Jayaraman, Ansa Maria Sebastian, Praveer Sihota
Glioblastoma multiforme (GBM) appears undifferentiated and non-enhancing on magnetic resonance (MR) imagery. As MRI does not offer adequate image quality to allow visual discrimination of the boundary between GBM focus and perifocal vasogenic edema, surgical and radiotherapy planning become difficult. The presence of noise in MR images influences the computation of radiation dosage and precludes the edge based segmentation schemes in automated software for radiation treatment planning. The performance of techniques meant for simultaneous denoising and sharpening, like high boost filters, high frequency emphasize filters and two-way anisotropic diffusion is sensitive to the selection of their operational parameters...
April 13, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29654521/fully-convolutional-networks-fcns-based-segmentation-method-for-colorectal-tumors-on-t2-weighted-magnetic-resonance-images
#14
Junming Jian, Fei Xiong, Wei Xia, Rui Zhang, Jinhui Gu, Xiaodong Wu, Xiaochun Meng, Xin Gao
Segmentation of colorectal tumors is the basis of preoperative prediction, staging, and therapeutic response evaluation. Due to the blurred boundary between lesions and normal colorectal tissue, it is hard to realize accurate segmentation. Routinely manual or semi-manual segmentation methods are extremely tedious, time-consuming, and highly operator-dependent. In the framework of FCNs, a segmentation method for colorectal tumor was presented. Normalization was applied to reduce the differences among images...
April 13, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29637425/investigation-of-contrast-enhanced-subtracted-breast-ct-images-with-map-em-based-on-projection-based-weighting-imaging
#15
Zhengdong Zhou, Shaolin Guan, Runchao Xin, Jianbo Li
Contrast-enhanced subtracted breast computer tomography (CESBCT) images acquired using energy-resolved photon counting detector can be helpful to enhance the visibility of breast tumors. In such technology, one challenge is the limited number of photons in each energy bin, thereby possibly leading to high noise in separate images from each energy bin, the projection-based weighted image, and the subtracted image. In conventional low-dose CT imaging, iterative image reconstruction provides a superior signal-to-noise compared with the filtered back projection (FBP) algorithm...
April 10, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29633174/glossokinetic-potential-based-tongue-machine-interface-for-1-d-extraction
#16
Kutlucan Gorur, M Recep Bozkurt, M Serdar Bascil, Feyzullah Temurtas
The tongue is an aesthetically useful organ located in the oral cavity. It can move in complex ways with very little fatigue. Many studies on assistive technologies operated by tongue are called tongue-human computer interface or tongue-machine interface (TMI) for paralyzed individuals. However, many of them are obtrusive systems consisting of hardware such as sensors and magnetic tracer placed in the mouth and on the tongue. Hence these approaches could be annoying, aesthetically unappealing and unhygienic...
April 9, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29633173/study-of-continuous-blood-pressure-estimation-based-on-pulse-transit-time-heart-rate-and-photoplethysmography-derived-hemodynamic-covariates
#17
Jingjie Feng, Zhongyi Huang, Congcong Zhou, Xuesong Ye
It is widely recognized that pulse transit time (PTT) can track blood pressure (BP) over short periods of time, and hemodynamic covariates such as heart rate, stiffness index may also contribute to BP monitoring. In this paper, we derived a proportional relationship between BP and PPT-2 and proposed an improved method adopting hemodynamic covariates in addition to PTT for continuous BP estimation. We divided 28 subjects from the Multi-parameter Intelligent Monitoring for Intensive Care database into two groups (with/without cardiovascular diseases) and utilized a machine learning strategy based on regularized linear regression (RLR) to construct BP models with different covariates for corresponding groups...
April 9, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29582243/monte-carlo-simulations-for-dose-enhancement-in-cancer-treatment-using-bismuth-oxide-nanoparticles-implanted-in-brain-soft-tissue
#18
Eslam Taha, Fathi Djouider, Essam Banoqitah
The objective of this work is to study the dosimetric performances of bismuth oxide nanoparticles implanted in tumors in cancer radiotherapy. GEANT4 based Monte Carlo numerical simulations were performed to assess dose enhancement distributions in and around a 1 × 1 × 1 cm3 tumor implanted with different concentrations of bismuth oxide and irradiated with low energies125 I,131 Cs, and103 Pd radioactive sources. Dose contributions were considered from photoelectrons, Auger electrons, and characteristic X-rays...
March 26, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29569210/a-simulation-study-comparing-nine-mathematical-models-of-arterial-input-function-for-dynamic-contrast-enhanced-mri-to-the-parker-model
#19
Dianning He, Lisheng Xu, Wei Qian, James Clarke, Xiaobing Fan
Due to large inter- and intra-patient variabilities of arterial input functions (AIFs), accurately modeling and using patient-specific AIF are very important for quantitative analysis of dynamic contrast enhanced MRI. Computer simulations were performed to evaluate and compare nine population AIF models with the Parker AIF used as 'gold standard'. The Parker AIF was calculated with a temporal resolution of 1.5 s, and then the other nine AIF models were used to fit the Parker AIF. A total of 100 randomly generated volume transfer constants (Ktrans ) and distribution volumes (ve ) were used to calculate the contrast agent concentration curves based on the Parker AIF and the extended Tofts model with blood plasma volume (vp ) = 0...
March 23, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29569209/rejoinder-to-letters-to-the-editor-luke-wilkinson-and-donald-mclean-in-response-to-giovanni-bibbo-s-letter-to-the-editor-standardisation-of-shielding-of-medical-x-ray-installations
#20
LETTER
Giovanni Bibbo
No abstract text is available yet for this article.
March 22, 2018: Australasian Physical & Engineering Sciences in Medicine
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