Superficial Dosimetry for Helical Tomotherapy
نویسندگان
چکیده
منابع مشابه
Clinical helical tomotherapy commissioning dosimetry.
Helical tomotherapy presented many unique dosimetric challenges and solutions during the initial commissioning process, and some of them are presented. The dose calculation algorithm is convolution/superposition based. This requires that the energy fluence spectrum and magnitude be quantified. The methodology for doing so is described. Aspects of the energy fluence characterization that are uni...
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Helical tomotherapy is a rotational delivery technique that uses intensity-modulated fan beams to deliver highly conformal intensity-modulated radiation therapy (IMRT). The beam-on time needed to deliver a given prescribed dose can be up to 15 times longer than that needed using conventional treatment delivery. As such, there is concern that this delivery technique has the potential to increase...
متن کاملThe helical tomotherapy thread effect.
Inherent to helical tomotherapy is a dose variation pattern that manifests as a "ripple" (peak-to-trough relative to the average). This ripple is the result of helical beam junctioning, completely unique to helical tomotherapy. Pitch is defined as in helical CT, the couch travel distance for a complete gantry rotation relative to the axial beam width at the axis of rotation. Without scattering ...
متن کاملRadiation characteristics of helical tomotherapy.
Helical tomotherapy is a dedicated intensity modulated radiation therapy (IMRT) system with on-board imaging capability (MVCT) and therefore differs from conventional treatment units. Different design goals resulted in some distinctive radiation field characteristics. The most significant differences in the design are the lack of flattening filter, increased shielding of the collimators, treatm...
متن کاملThe optimization of superficial planning target volumes (PTVs) with helical tomotherapy
When the planning target volume (PTV), extends close to or beyond the skin, inverse-planned intensity-modulated radiotherapy can boost the fluence from tan- gential angles to superficial parts of the PTV due to the buildup effect. This can result in significant regions of high dose upon a small movement in the patient's position. We analyzed different methods of reducing this effect in the Tomo...
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ژورنال
عنوان ژورنال: The Journal of the Korean Society for Therapeutic Radiology and Oncology
سال: 2009
ISSN: 1229-8719
DOI: 10.3857/jkstro.2009.27.2.103