Process for automatically determining the configuration of a ste

Details Process for automatically determining the configuration of a ste Process for automatically determining the configuration of a ste

1998-06-22

2000-03-28

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Absorption

378148, 600 1, A61N 510

Patent

active

060441267

ABSTRACT:
Process for determining the configuration or configurations [treatment time (TT.sub.i)/diameter (.phi..sub.i,f) of each collimator] of a helmet for stereotactic radiosurgery, to which can be fitted an plurality of collimators focused on an irradiation isocenter, consisting in automatically optimizing, through iterative dose calculation, the dose (D.sub.p) received at predetermined optimization points (M.sub.p), by modifying, in the course of the successive iterations, the treatment time (TT.sub.i) of at least one shot (i) and the diameter (.phi..sub.i,f) of at least one collimator (C.sub.f) of at least one shot (i), and by calculating, at each iteration, an objective function (OF) having as variables the differences between the calculated dose (D.sub.p) and the expected dose (ED.sub.p) for each point of optimization (M.sub.p), iterative calculation of the doses being carried out automatically until the objective function (OF) satisfies a predetermined optimization criterion.

REFERENCES:
patent: 4780898 (1988-10-01), Sundqvist
patent: 5315360 (1994-05-01), Sturm et al.
patent: 5602892 (1997-02-01), Llacer
patent: 5627870 (1997-05-01), Kopecky
patent: 5629967 (1997-05-01), Leksell et al.
patent: 5647663 (1997-07-01), Holmes

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