IMAGE GUIDED RADIATION THERAPY

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Khushbu    on Jul 30, 2012 Says :

good set of information provided on image guided radiation therapy.
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Slide 1 : IGRT NIMESH DAHIMA
Slide 2 : IGRT is a component of the radiation therapy process that incorporate imaging coordinates from the treatment plan to be delivered in order to ensure the patient is properly aligned in the treatment room. IGRT –IMAGE GUIDED RADIOTHERAPY
Slide 3 : Intensity modulated radiation therapy (IMRT) is an advanced radiotherapy technique used to minimize the amount of normal tissue being irradiated in the treatment field. In some systems this intensity modulation is achieved by moving the leaves in the MLC during the course of treatment, thereby delivering a radiation field with a non-uniform (i.e. modulated) intensity. With IMRT, radiation oncologists are able to break up the radiation beam into many "beamlets." This allows us to vary the intensity of each beamlet. With IMRT, we are often able to further limit the amount of radiation received by healthy tissue near the tumor. We have found this sometimes allowed them to safely give a higher dose of radiation to the tumor, potentially increasing the chance of a cure. IMRT - IMAGE GUIDED RADIOTHERAPY
Slide 4 : To improve the accuracy of the radiation field placement To reduce the exposure of healthy tissue during radiation treatment Goal and Clinical benefit
Slide 5 : A typical multi-leaf collimator (MLC) consists of 2 sets of 20-40 leaves, each around 5mm thick and several cm in the other two dimensions. Newer MLCs now have up to 160 leaves. Each leaf in the MLC is aligned parallel to the radiation field and can be moved independently to block part of the field. This allows the dosimetrist to match the radiation field to the shape of the tumor (by adjusting the position of the leaves), thus minimizing the amount of healthy tissue being exposed to radiation. On a machine without an MLC this must be accomplished using several hand-crafted blocks. Multi-leaf collimator
Slide 6 : X-rays are generated by bombarding a high atomic number material with electrons. If the target is removed (and the beam current decreased) a high energy electron beam is obtained. Electron beams are useful for treating superficial lesions because the maximum of dose deposition occurs near the surface. The dose then decreases rapidly with depth, sparing underlying tissue. Electron beams usually have nominal energies in the range 4-20 MeV. Depending on the energy this translates to a treatment range of approximately 1–5 cm (in water-equivalent tissue). Energies above 18 MeV are used very rarely. Although the X-ray target is removed in electron mode, the beam must be fanned out by sets of thin scattering foils in order to achieve flat and symmetric dose profiles in the treated tissue. Electrons
Slide 7 : ORFIT
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Slide 9 : CT SIMULATION
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Slide 19 : Treatment Delivery: Multileaf Collimator
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Add as Friend nkd     9 Months ago.
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Trying to explain a newer treatment modality used to treating various kinds of malignancies.
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