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SOLVE IT?………..

A patient has to be treated by direct 6MV posterior spinal field of size 6 cm(width) x 48 cm(length) at an extended SSD of 120 cm.The prescribed dose is 1.8 Gy at a depth of 5.5 cm.

A Data( output at max for 100 cm SSD, TMR) are given in the tables below.Using ONLY The data given the tables, find out the treatment MUs.

Note: For equivalent square field, use the formula: Side of the square = 4*(area/perimeter)