Field splitting for intensity modulated fields of large size

Details Field splitting for intensity modulated fields of large size Field splitting for intensity modulated fields of large size

2006-11-28

2006-11-28

Glick, Edward J. (Department: 2882)

X-ray or gamma ray systems or devices

Specific application

Absorption

Reexamination Certificate

active

07142635

ABSTRACT:
A method of delivering intensity modulated radiation therapy (IMRT) is disclosed. An intensity profile for the treatment of a patient is provided which spans a prescribed field width and includes a discrete profile having intensity values at each of a plurality of sample points bounded by the prescribed width. The prescribed width is compared to a maximum field width provided by the radiation treatment system. The intensity profile is split into a plurality of intensity profile portions, each having respective widths less than the maximum width if the prescribed width is greater than the maximum width. The prescribed field is also divided into a plurality of different profile portion split arrangements. A monitor unit (MU) efficiency is calculated for each of the arrangements. One of the arrangements is selected for delivery by the system using a leaf sequencing method.

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Langer, Mark et al. “Improved leaf sequencing reduces segments or monitor units needed to deliver IMRT using multileaf collimators” Med. Phys. 28(12) Dec. 2001, pp. 2450-2458.
Wu, Q. et al. “Dynamic splitting of large intensity-modulated fields”, Phys. Med. Biol., 2000, 45:1731-1740.

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