By S. Webb
An important radiotherapy modality used this present day, depth modulated radiation remedy (IMRT), is the main technologically complex radiotherapy melanoma therapy to be had, quickly exchanging conformal and third-dimensional thoughts. due to those alterations, oncologists and radiotherapists want up to date details accrued by way of physicists and engineers. concentrating on new advancements and the initial scientific implementation, modern IMRT: constructing Physics and medical Implementation discusses the connection among those advances and functions. shooting modern technological advances, the booklet studies glossy purposes of IMRT and exhibits how IMRT is used now and the way will probably be utilized in the longer term. The publication starts off with a old history of IMRT in addition to a dialogue of the present nation of IMRT. It additionally covers technical ideas which were commercialized, resembling the sliding window method, step-and-shoot, tomotherapy, and the Cyberknife. the ultimate bankruptcy explores imaging advancements and new making plans equipment, together with gradient-descent and break up modulation.Covering contemporary developments in IMRT and exhibiting how those concepts and units were carried out, modern IMRT: constructing Physics and scientific Implementation offers state of the art findings for oncologists, radiotherapists, radiographers, physicists, and engineers.
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Extra resources for Contemporary IMRT: Developing Physics and Clinical Implementation (Series in Medical Physics and Biomedical Engineering)
Example text
This latter problem was overcome by noting that there are periods at which the vanes are fully open and these can be used to ‘normalize’ the projection data for a limited subset of measurements thus Copyright © 2005 IOP Publishing Ltd. 7. Schematic diagram showing the principle of operation of helical tomotherapy. The irradiation of a whole volume is shown. The MIMiC has only one bank of 64 vanes. The accelerator with this MIMiC rotates continuously around the patient without reversing direction whilst the patient slowly translates longitudinally.
The gantry rotates more than once continually as the patient traverses longitudinally and slowly through the beam. 7). In spiral tomotherapy the fan-beam thickness (FBT) can be chosen by the operator to balance the fast treatment time and dose modulation in the superior–inferior direction. The pitch factor is the couch movement per rotation in units of the FBT. 5 mm result in advantageous overlap between adjacent helical rotations. The modulation factor (MF) is the ratio of maximum leaf opening time to the mean leaf opening time in any projection and can also be user-selected (Kron et al 2004a).
Because there is no flattening filter, the open beam has an intensity that is highest at the centre of the beam and decreases nearly linearly towards the ends of the beam (Jeraj et al 2004). Hence, a modulation is required to produce a pseudo uniform beam. Mackie et al (2002) describe how straightforward this is to achieve. The machine is also being used to deliver complex whole body irradiation (Mackie et al 2003b). Copyright © 2005 IOP Publishing Ltd. 34 Developments in rotation IMRT and tomotherapy Kron et al (2002) have compared plans created for tomotherapy with IMRT plans created using the Theraplan Plus treatment-planning system.
