The impact of daily setup variations on IMRT

The impact of daily setup variations on head-and-neck intensity-modulated radiation therapy.

Int J Radiat Oncol Biol Phys. 2005 Mar 1;61(3):779-88.

Hong TS, Tome WA, Chappell RJ, Chinnaiyan P, Mehta MP, Harari PM.

Department of Human Oncology, University of Wisconsin Medical School, Madison, WI, USA.

In this article, they said 'Using conventional H&N masking and laser alignment for daily positioning, the mean setup error in any single dimension averaged 3.33 mm.' and also said 'Unrecognized geographic miss and resultant target underdose may occur.' So I planed sample plans 3mm deviated isocenter for each direction.

IMRT

 

                     Left: Just at true isocenter                      Right:-3mm deviated for X,Y,Z direction            

Dose distribution chaged, and cold points were generated.

CFIMRT

               Left: Just at true isocenter                      Right:-3mm deviated for X,Y,Z direction     

DVHs(IMRT)

DVHs(CFIMRT)

This clinical plan was shown at here.

last modification date: 2006/04/05