Physicians and Faculty
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Satish C Prasad, Ph.D.Professor, Radiation Oncology636 University Hospital Upstate Medical University 750 East Adams Street Syracuse, NY 13210 |
Education and Clinical Training
Ph.D.: 1972, University of MassachusettsClinical Specialty
Radiation Oncology Physics, Certified: 1978Clinical Department/Section Affiliations
Radiation OncologyResearch Program and Department Affiliations
Radiation OncologyRadiology
Research Interests
Explorations of radiation-matter interactions vis a vis geometry and dose distribution.Research Abstract
Dosimetry of Asymmetric X-Ray Beams on a Linear Accelerator.
Linear accelerators with x-ray collimators that give asymmetric treatment fields have become common. In an asymmetric field, the center of the field is away from the true central axis where dosimetric data are normally obtained. We have proposed a simple approach to the calculation of dose for asymmetric fields. We use central axis tissue-maximum ratio, off-axis factor in water- equivalent phantom and relative field-size factor in phantom to calculate dose. We have verified the accuracy of our calculations with experimental measurements. Agreement within 3% was found.
Effect of Air Cavity on Surface Dose for Tangential Electron Beam.
Dose to a surface parallel to an incident electron beam is being investigated in the presence of air cavities. Measurements have been made using a parallel plate ionization chamber in an acrylic phantom for 6, 9, 12, 16 and 20 MeV electron beams. The results of our measurements show a 5 to 10% reduction in dose depending on electron beam energy, depth of measurement and cavity size.
Selected References
Prasad, S.C., A.J. Krol and D.A. Bassano: Comparison of measured and calculated dose for asymmetric x-ray beams defined by independently movable collimators. Medical Dosimetry 21:105-107, 1996.
This profile was last updated on 04/01/2004
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