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Scanner uniformity improvements for radiochromic film analysis with matt reflectance backing
Springer Science and Business Media LLC - Tập 34 - Trang 401-407 - 2011
Ethan Butson, Hani Alnawaf, Peter K. N. Yu, Martin Butson
A simple and reproducible method for increasing desktop scanner uniformity for the analysis of radiochromic films is presented. Scanner uniformity, especially in the non-scan direction, for transmission scanning is well known to be problematic for radiochromic film analysis and normally corrections need to be applied. These corrections are dependant on scanner coordinates and dose level applied wh...... hiện toàn bộ
Echocardiographic assessment of long-term hemodynamic characteristics of mechanical mitral valve prostheses with different mitral valvular diseases
Springer Science and Business Media LLC - Tập 40 - Trang 259-266 - 2017
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...... hiện toàn bộ
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
Anna Hayton, Anthony Wallace
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
Neda Gholizadeh, Todsaporn Fuangrod, Peter B. Greer, Peter Lau, Saadallah Ramadan, John Simpson
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...... hiện toàn bộ
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
G. Uma Vetri Selvi, R. Nadarajan
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...... hiện toàn bộ
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
P. B. Greer, W. A. Beckham
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...... hiện toàn bộ
Non-targeted effects of ionising radiation and radiotherapy
Springer Science and Business Media LLC - Tập 33 - Trang 219-231 - 2010
Svetlana Sjostedt, Eva Bezak
Modern radiobiology is undergoing rapid change due to new discoveries contradicting the target concept which is currently used to predict dose–response relationships. Thus relatively recently discovered radiation-induced bystander effects (RIBEs), that include additional death, mutation and radio-adaptation in non-irradiated cells, change our understanding of the target concept and broadens its bo...... hiện toàn bộ
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
M. A. Ebert, S. J. Howlett, K. Harrison, D. Cornes, C. S. Hamilton, J. D. Denham
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...... hiện toàn bộ
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
Wan Nordiana Rahman, Christopher James Wong, Trevor Ackerly, Naoto Yagi, Moshi Geso
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...... hiện toàn bộ
Clinical engineering and uncertainty in clinical measurements
Springer Science and Business Media LLC - Tập 37 - Trang 467-470 - 2014
Emmanuel Koumoundouros
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