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https://hdl.handle.net/2440/49926
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dc.contributor.author | Reich, P. | - |
dc.contributor.author | Bezak, E. | - |
dc.contributor.author | Mohammadi, M. | - |
dc.contributor.author | Fog, L. | - |
dc.date.issued | 2006 | - |
dc.identifier.citation | Australasian Physical and Engineering Sciences in Medicine, 2006; 29(1):18-29 | - |
dc.identifier.issn | 0158-9938 | - |
dc.identifier.issn | 1879-5447 | - |
dc.identifier.uri | http://hdl.handle.net/2440/49926 | - |
dc.description.abstract | Patient dose verification is becoming increasingly important with the advent of new complex radiotherapy techniques such as conformal radiotherapy (CRT) and intensity-modulated radiotherapy (IMRT). An electronic portal imaging device (EPID) has potential application for in vivo dosimetry. In the current work, an EPID has been modelled using a treatment planning system (TPS) to predict transmitted dose maps. A thin slab of RW3 material used to initially represent the EPID. A homogeneous RW3 phantom and the thin RW3 slab placed at a clinical distance away from the phantom were scanned using a CT simulator. The resulting CT images were transferred via DICOM to the TPS and the density of the CT data corresponding to the thin RW3 slab was changed to 1 g/cm3. Transmitted dose maps (TDMs) in the modelled EPID were calculated by the TPS using the collapsed-cone (C-C) convolution superposition (C/S) algorithm. A 6 MV beam was used in the simulation to deliver 300 MU to the homogenous phantom using an isocentric and SSD (source-to-surface) technique. The phantom thickness was varied and the calculated TDMs in the modelled EPID were compared with corresponding measurements obtained from a calibrated scanning liquid-filled ionisation chamber (SLIC) EPID. The two TDMs were compared using the gamma evaluation technique of Low et al. The predicted and measured TDMs agree to within 2 % (averaged over all phantom thicknesses) on the central beam axis. More than 90 % of points in the dose maps (excluding field edges) produce a gamma index less than or equal to 1, for dose difference (averaged over all phantom thicknesses), and distance-to-agreement criteria of 4 %, 3.8 mm, respectively. In addition, the noise level on the central axis in the predicted dose maps is less than 0.1 %. We found that phantom thickness changes of approximately 1 mm, which correspond to dose changes on the central beam axis of less than 0.6 %, can be detected in the predicted transmitted dose distributions. | - |
dc.description.statementofresponsibility | P. Reich, E. Bezak, M. Mohammadi and L. Fog | - |
dc.language.iso | en | - |
dc.publisher | Australasian College of Physical Scientists and Engineers in Medicine | - |
dc.source.uri | http://dx.doi.org/10.1007/bf03178824 | - |
dc.subject | Humans | - |
dc.subject | Neoplasms | - |
dc.subject | Radiographic Image Interpretation, Computer-Assisted | - |
dc.subject | Imaging, Three-Dimensional | - |
dc.subject | Subtraction Technique | - |
dc.subject | Radiotherapy, Conformal | - |
dc.subject | Radiotherapy Dosage | - |
dc.subject | Radiotherapy Planning, Computer-Assisted | - |
dc.subject | Sensitivity and Specificity | - |
dc.subject | Reproducibility of Results | - |
dc.subject | Radiometry | - |
dc.subject | Body Burden | - |
dc.subject | Phantoms, Imaging | - |
dc.subject | Relative Biological Effectiveness | - |
dc.subject | Algorithms | - |
dc.subject | Scattering, Radiation | - |
dc.subject | Models, Biological | - |
dc.subject | Computer Simulation | - |
dc.title | The prediction of transmitted dose distributions using a 3D treatment planning system | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1007/BF03178824 | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Bezak, E. [0000-0002-1315-1735] | - |
dc.identifier.orcid | Mohammadi, M. [0000-0002-2393-8849] | - |
Appears in Collections: | Aurora harvest Chemistry and Physics publications |
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