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- W1569189913 abstract "Background: IMRT is the logical continuation of conformal radiotherapy in the sense that, over the high-dose volume, the dose distribution itself rather than its geometry is actively controlled in three dimensions. Volume averaging and lack of electronic equilibrium complicate accurate dosimetry of small photon fields.Objective: To evaluate the performance of the PinPoint ion chamber for characterizing small fields used in intensity-modulated radiotherapy (IMRT) technique.Method: A 6 MV photon beam (Siemens Primus Linac) has been employed. We used the PTW dosimetry system and MP3 water tank to compare beam character of PinPoint and Semiflex chambers. Results: The build up region in pinpoint is 1.6 cm but in Semiflex is 1.7 cm. The penumbra regions in pinpoint is smaller than PinPoint.Conclusion: The pinpoint chamber has a high resolution. The smallest field size 2x2 cm or less should be measured using PinPoint chamber rather than semiflex chamber. Keywords: Radiation Equipment and Supplies - Radiotherapy, Intensity-Modulated - Radiotherapy Dosage -Radiotherapy, High-Energy – Biophysics - Quality Assurance, Health Care - Small field size - pinpoint chamber - Africa, Northern, Egypt." @default.
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- W1569189913 date "2010-01-01" @default.
- W1569189913 modified "2023-09-26" @default.
- W1569189913 title "Study The Efficiency Of Pinpoint And Semiflex Chambers For Measuring The Smallest Field Size Required For Intensity- Modulated Radiotherapy (IMRT) Technique" @default.
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