Question

.6MeV beam, to a tumour located at a depen of 13 cm. An 11 × 11 cm neld is to be used with . 100 cm SSD. For this beam in this etry, you 12x12cm field at depth of 10cm . 689%, POD for a 10x10cm feld at depth n, even the sewne aantona, data POO fur ,10.10cm, ne4 at depth of 10 cm . 676% 15 cm-52.6%, and POD for a 12 x 12 om feid at depth of 15 cm-53.9%.Compute the maximum dose (in Gy) received at any location within the patiene's anatomy. (For all fheid sizes and depths stated above, the dose at depeh d, Dio), is linear with respect to field size and inear with respect to depth.)

Answer 1

Given data A does of 16 Gy is to be derided with 6 mev a tumour located at a depth of 13 cm A dose of 16 Gy is to be derived with a 6 mev beam to a tumor becaused at depth of 13 cm An 11 times 11 cm field is to be used with a 100 cm SSD For this beam in this geometly you are given the following additional data: PDD for a 10 times 10 cm field at depth of 10 cm = 67.6% PDD for a 12 times 12 cm field of depth of 10 cm = 68.9 % PDD for 10 times 10 cm field at depth of 15 cm = 52.6 % and PDD for 13 times 12 cm field at depth of 15 c.m = 53.4 % \r\n Given D_max = 16 times 10^2 CGy PDD_max = 16 times 100 = 1600 PDD_max = 33.4 %