Abstract:
:Currently, a software-based second check dose calculation for helical tomotherapy (HT) is not available. The goal of this study is to evaluate the dose calculation accuracy of the in-house software using EGS4/MCSIM Monte Carlo environment against the treatment planning system calculations. In-house software was used to convert HT treatment plan information into a non-helical format. The MCSIM dose calculation code was evaluated by comparing point dose calculations and dose profiles against those from the HT treatment plan. Fifteen patients, representing five treatment sites, were used in this comparison. Point dose calculations between the HT treatment planning system and the EGS4/MCSIM Monte Carlo environment had percent difference values below 5 % for the majority of this study. Vertical and horizontal planar profiles also had percent difference values below 5 % for the majority of this study. Down sampling was seen to improve speed without much loss of accuracy. EGS4/MCSIM Monte Carlo environment showed good agreement with point dose measurements, compared to the HT treatment plans. Vertical and horizontal profiles also showed good agreement. Significant time saving may be obtained by down-sampling beam projections. The dose calculation accuracy of the in-house software using the MCSIM code against the treatment planning system calculations was evaluated. By comparing point doses and dose profiles, the EGS4/MCSIM Monte Carlo environment was seen to provide an accurate independent dose calculation.
journal_name
Australas Phys Eng Sci Medjournal_title
Australasian physical & engineering sciences in medicineauthors
Dzintars E,Stathakis S,Mavroidis P,Sadeghi A,Papanikolaou Ndoi
10.1007/s13246-012-0165-xsubject
Has Abstractpub_date
2012-12-01 00:00:00pages
423-38issue
4eissn
0158-9938issn
1879-5447journal_volume
35pub_type
杂志文章abstract::The assignment of pathogenicity to variants suspected of causing an inherited retinal disease and the subsequent creation of molecular genetic reports sent to clinical geneticists and ophthalmologists has traditionally been time-consuming and subject to error and ambiguity. The purpose of this paper is to describe a c...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-015-0420-z
更新日期:2016-03-01 00:00:00
abstract::A set of four 4 MV photon beam compensators were produced, one for each field of a Hodgkins Disease treatment plan. The resultant dose profiles at various depths were measured by an ion chamber in water and by Kodak X-Omat V film in a Solid Water phantom, and compared to the doses calculated by a GE RT/Plan treatment ...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:
更新日期:1992-03-01 00:00:00
abstract::A general purpose, multi-channel digital data acquisition and analysis system (Amlab, Associative Measurements, Sydney) configured to collect and process physiological signals including electroencephalograph and blood pressure is described. Its advantages over analog and single-purpose instrumentation are discussed as...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:
更新日期:1995-09-01 00:00:00
abstract::A variable magnetic deflector which attaches onto the treatment head of a linear accelerator has reduced skin dose by as much as 65% for 6MV x-rays. The magnetic deflector is constructed from Neodymium Iron Boron (NdFeB) rare earth magnets. It weighs approximately 15 kg and is designed to easily fit onto the accessory...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:
更新日期:1997-06-01 00:00:00
abstract::This paper describes a software tool developed for research into the use of an electronic portal imaging device (EPID) to verify dose for intensity modulated radiation therapy (IMRT) beams. A portal dose image prediction (PDIP) model that predicts the EPID response to IMRT beams has been implemented into a commerciall...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/BF03179347
更新日期:2008-09-01 00:00:00
abstract::Coronary artery disease producing ischemic cardiomyopathy is the most frequent cause of left ventricular systolic dysfunction. Non-ischemic cardiomyopathies can also produce systolic dysfunction; they may be inherited as genetic disorders or occur sporadically. These coronary injuries have repercussions on the left ve...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/BF03178864
更新日期:2005-03-01 00:00:00
abstract::The effects of internal and external scatter on surface, build-up and depth dose characteristics simulated by Monte Carlo code EGSnrc for varying field size and SSD for a 10 MeV monoenergetic electron beam with and without an accelerator model are extensively studied in this paper. In particular, sub-millimetre surfac...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/BF03178710
更新日期:2005-09-01 00:00:00
abstract::Diamond detectors are particularly well suited for dosimetry applications in radiotherapy for reasons including near-tissue equivalence and high-spatial resolution resulting from small sensitive volumes. However, these detectors have not become commonplace due to high cost and poor availability arising from the need f...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-010-0040-6
更新日期:2010-12-01 00:00:00
abstract::The Resonant Recognition Model (rrm) uses digital signal processing methods to investigate protein structure-function; and links the biological function of protein families to unique characteristic frequencies. The rrm originally used a single set of variables: the electron ion interaction potential (EIIP). Here the r...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:
更新日期:1995-12-01 00:00:00
abstract::It was the aim of this work to assess and track the workload, working conditions and professional recognition of radiation oncology medical physicists (ROMPs) in the Asia Pacific region over time. In this third survey since 2008, a structured questionnaire was mailed in 2014 to 22 senior medical physicists representin...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-015-0373-2
更新日期:2015-09-01 00:00:00
abstract::The reliability of the traditional Cobb angle index, which at present exhibits a wide range of reported values, was determined in this study and amounted to a within subject error of +/-4.3 degrees and a between subject error of +/-4.9 degrees. An attempt to pinpoint the source of this variability by investigating the...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:
更新日期:1989-03-01 00:00:00
abstract::Magnetic resonance imaging has become a key modality within the modern radiology department. In addition to the conventional slice images, three dimensional angiographic images, and quantitative flow measurements can be obtained. More recently methods have been developed which enable one to visualize the motion of obj...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章,评审
doi:
更新日期:1991-12-01 00:00:00
abstract::This study was aimed to improve the surgical accuracy of plating and screwing for complicated tibial plateau fracture assisted by 3D implants library and 3D-printed navigational template. Clinical cases were performed whereby complicated tibial plateau fractures were imaged using computed tomography and reconstructed ...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-015-0330-0
更新日期:2015-03-01 00:00:00
abstract::In-phantom figures of merit of the radiobiological dose distribution are the main criteria for evaluation of the boron neutron capture therapy (BNCT) plan and neutron beam evaluation. Since in BNCT there are several reactions, which contribute to the total dose of the tissue, the calculation of the dose distribution i...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-011-0107-z
更新日期:2011-12-01 00:00:00
abstract::Most of the human head models used in dipole localisation research, which have been reported in the literature to date, assume a simplified cranial structure wherein the head is modelled as a set of distinct homogenous tissue compartments. The inherent inhomogeneity of the tissues has so far been ignored in these mode...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/BF03178283
更新日期:2001-03-01 00:00:00
abstract::Calculations have been performed of the kerma to radiographic film and to silicon from a number of x-ray spectra generated at 30 to 140 kV with tungsten and molybdenum targets. These results have been compared with the air-kerma values due to the same beams. It is concluded that both film and silicon can be used as pr...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:
更新日期:1992-12-01 00:00:00
abstract::At present, the Australasian College of Physical Scientists and Engineers in Medicine does not support the practice of self-referred whole-body CT screening of asymptomatic patients because: The procedure involves a non-trivial radiation dose, which assumes even greater significance in the context of an ongoing screen...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 指南,杂志文章
doi:10.1007/BF03178880
更新日期:2004-03-01 00:00:00
abstract::TomoTherapy can provide highly accurate SABR deliveries, but currently it does not have any effective motion management techniques. Shallow breathing has been identified as one possible motion management solution on TomoTherapy, which has been made possible with the BreatheWell audiovisual biofeedback (AVB) device. Si...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-019-00727-8
更新日期:2019-03-01 00:00:00
abstract::This paper analyses daily ozone, cloud cover, solar radiation and broadband UV-B data for winter/spring at a low pollution Southern Hemispheric sub-tropical site (27.80 degrees S). The average ozone concentration for the period was 290 DU. An anti-correlation is presented between the ozone and UV-B data over a 5 day p...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:
更新日期:1997-12-01 00:00:00
abstract::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...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 临床试验,杂志文章
doi:10.1007/s13246-016-0471-9
更新日期:2016-12-01 00:00:00
abstract::Memory plays an important role in human life. Memory can be divided into two categories, i.e., long term memory and short term memory (STM). STM or working memory (WM) stores information for a short span of time and it is used for information manipulations and fast response activities. WM is generally involved in the ...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章,评审
doi:10.1007/s13246-016-0438-x
更新日期:2016-06-01 00:00:00
abstract::Large differences in monitor units have been observed when RadCalc, a pencil-beam-algorithm based software, is used to verify clinical electron plans from Raystation, a Monte-Carlo-algorithm based planning system. To investigate the problem, a number of clinical plans as well as test plans were created and calculated ...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-016-0470-x
更新日期:2016-09-01 00:00:00
abstract::The reference air kerma rate from 192Ir High Dose Rate (HDR) brachytherapy sources can be measured using a suitably calibrated Farmer chamber and an appropriate in-air calibration jig. When a primary standard for 192Ir gamma rays is available, a calibration coefficient for the chamber and jig combination can be determ...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/BF03178603
更新日期:2008-12-01 00:00:00
abstract::The dosimetric features of the Fricke dosimeter in clinical linear accelerator beams are considered. Experimental data were obtained using various nominal energies 6 and 18 MV, 12 and 15 MeV, including the (60)Co γ-ray beam. The calibration of the dosimeters was performed using the ionization chamber as a reference do...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-011-0093-1
更新日期:2011-12-01 00:00:00
abstract::A new PTW advanced Markus ionization chamber has been implemented in IMRT fields, to measure surface dose at ICRU and ICRP reference depth of 0.07 mm [ICRU Report 39, Determination of dose equivalents resulting from external radiation sources, 1985; ICRP Publication 60, 1990 recommendations of the International Commis...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-010-0004-x
更新日期:2010-03-01 00:00:00
abstract::Segmentation of different tissues is one of the initial and most critical tasks in different aspects of medical image processing. Manual segmentation of brain images resulted from magnetic resonance imaging is time consuming, so automatic image segmentation is widely used in this area. Ensemble based algorithms are ve...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-015-0352-7
更新日期:2015-06-01 00:00:00
abstract::Radiation therapy of cancer is today going through a very dynamic development with the introduction of a large number of new treatment principles, new types of treatment units and new radiobiologically based optimization algorithms for treatment planning. All of these make use of the recent developments in three dimen...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章,评审
doi:
更新日期:1996-06-01 00:00:00
abstract::Conventional laser accelerated proton beam has broad energy spectra. It is not suitable for clinical use directly, so it is necessary for employing energy selection system. However, in the conventional laser accelerated proton system, the intensity of the proton beams in the low energy regime is higher than that in th...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-014-0292-7
更新日期:2014-12-01 00:00:00
abstract::The alcoholism can be detected by analyzing electroencephalogram (EEG) signals. However, analyzing multi-channel EEG signals is a challenging task, which often requires complicated calculations and long execution time. This paper proposes three data selection methods to extract representative data from the EEG signals...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-015-0414-x
更新日期:2016-03-01 00:00:00
abstract::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 recog...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-018-0650-y
更新日期:2018-06-01 00:00:00