In treating with total body irradiation, how should the lung blocks be drawn and what dose should the lung receive?

I draw lung blocks 1 cm. insde the edge of peripheral lung including apex of the lung . The doses are usally 5% less than the prscribed doses to central axis . The typical TBI schedule as a conditioning regimen for BMT is 150 cGy BID for 1200 cGy .

Bharat