Journal of Medical Physics
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Year : 1997  |  Volume : 22  |  Issue : 2  |  Page : 30-35

Dose Uniformity In A Body During Fractionated Total Body Irradiation



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Julian Malicki


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This paper focuses on dose uniformity in a body during total body irradiation. A composition of lateral and anterior-posterior (AP/ PA) fields divided into 8 fractions during four consecutive days was used. The total dose of 12 Gy was delivered with a dose rate of 6-98 cGy / min (lateral) and 17.75 cGy / min (AP / PA). The error of the dose delivery process is estimated at 2.8% to 5%. Doses were calculated along the body midline and in chosen transverse cross-sections at the points on beam to body entry and exit. Dose in-vivo verifications have been performed with thermoluminecent, semiconductor and ionization dosimeters. The need for providing additional fields with the aim of improving dose homogeneity is discussed and examples of reduced deviations along midline as well as across transverses are given. The doses in a group of 11 patients are presented together with their deviations along the body midline and across transverse sections.


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