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Derivation of Australian diagnostic reference levels for paediatric multi detector computed tomography
Springer Science and Business Media LLC - Tập 39 Số 3 - Trang 615-626 - 2016
An inter-centre statistical scale standardisation for quantitatively evaluating prostate tissue on T2-weighted MRI
Springer Science and Business Media LLC - Tập 42 - Trang 137-147 - 2019
Magnetic resonance images (MRI) require intensity standardisation if they are used for the purpose of quantitative analysis as inherent variations in image intensity levels between different image sets are manifest due to technical factors. One approach is to standardise the image intensity values using a statistically applied biological reference tissue. The aim of this study is to compare the pe......
A rapid compression technique for 4-D functional MRI images using data rearrangement and modified binary array techniques
Springer Science and Business Media LLC - Tập 38 - Trang 731-742 - 2015
Compression techniques are vital for efficient storage and fast transfer of medical image data. The existing compression techniques take significant amount of time for performing encoding and decoding and hence the purpose of compression is not fully satisfied. In this paper a rapid 4-D lossy compression method constructed using data rearrangement, wavelet-based contourlet transformation and a mod......
The effect of leaf width and sampling distance on the “stair-stepping” of field borders defined by multileaf collimators
Springer Science and Business Media LLC - Tập 26 - Trang 44-51 - 2003
Standard multileaf collimators (MLCs) are now available with 1.0 and 0.5 cm leaf widths. The aim of this work is to compare the dose-undulation and effective penumbra of field edges formed by these MLC leaf widths and to determine how reducing the sampling distance (centre-to-centre distance between adjacent MLC leaves) for the 1.0 cm leaf width compares to the smaller leaf width. The undulation o......
Linear-accelerator X-ray output: a multicentre chamber-based intercomparison study in Australia and New Zealand
Springer Science and Business Media LLC - Tập 31 - Trang 268-279 - 2008
This paper describes the process and results of a survey of linear accelerator outputs as part of an Australasian Level III Dosimetry Intercomparison. This study involved the measurement of accelerator output under reference conditions (‘Level I’) with a small-volume ionisation chamber in water for 47 beams at 36 radiotherapy centres using the IAEA TRS 398 dose-to-water protocol. The mean ratio of......
Polymer gels impregnated with gold nanoparticles implemented for measurements of radiation dose enhancement in synchrotron and conventional radiotherapy type beams
Springer Science and Business Media LLC - Tập 35 - Trang 301-309 - 2012
Normoxic type polyacrylamide gel (nPAG) dosimeters are established for dose quantification in three-dimensions for radiotherapy and hence represent an adequate dosimeter for quantification of the dose variation due to the existence of the gold nanoparticles (AuNPs) in the target during irradiation. This work compared the degree of polymerisation in gel doped with nanoparticles (nPAG–AuNP) with con......
Artificially enriching the training dataset of statistical shape models via constrained cage-based deformation
Springer Science and Business Media LLC - Tập 42 - Trang 573-584 - 2019
The construction of a powerful statistical shape model (SSM) requires a rich training dataset that includes the large variety of complex anatomical topologies. The lack of real data causes most SSMs unable to generalize possible unseen instances. Artificial enrichment of training data is one of the methods proposed to address this issue. In this paper, we introduce a novel technique called constra......
Lessons learned from a HDR brachytherapy well ionisation chamber calibration error
Springer Science and Business Media LLC - Tập 34 - Trang 529-533 - 2011
The outcomes of a recent brachytherapy well-type ionization chamber calibration error are given in the hope that other brachytherapy treatment centres may better understand the importance of each entry stated in a well chamber calibration certificate. A Nucletron Source Dosimetry System (SDS) PTW well-type ionization chamber was sent for a biennial calibration in September 2010. Upon calibration o......
The effective atomic number of dosimetric gels
Springer Science and Business Media LLC - Tập 31 - Trang 131-138 - 2008
Radiological properties of gel dosimeters and phantom materials are often compared against each other and against water or tissue by consideration parameters including their effective atomic number, Zeff. Effective atomic numbers have been calculated for a range of ferrous-sulphate and polymeric gel dosimeters using mass attenuation coefficient data over the energy range 10 keV to 10 MeV. Data is ......
Numerical validation of pulse wave propagation: effects of arterial length
Springer Science and Business Media LLC - Tập 36 - Trang 423-429 - 2013
In this paper, the effects of arterial length on pulse wave propagation are presented to validate our fluid–structure interaction model. Three models, called the original, lengthened and shortened artery models, were obtained by changing arterial length. The results show that there is an obvious time delay between the velocity waveforms at two different locations in the original artery model, the ......
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