[Use of a multileaf collimator for the production of intensity-modulated beams].
In external radiotherapy, the use of intensity modulated fields has been proposed for tissue and non-homogeneity compensation or for the generation of conformal dose distributions. Multileaf collimators can be employed dynamically for the modulation of the X-ray field in two dimensions. Efficient dynamic collimation became possible due to advances in computer and linear accelerator technology. It presents a number of advantages over conventional methods such as the use of compensators. We have developed a program which calculates, from a given intensity distribution, the motion of the MLC leaves as a function of monitor units, and we have applied it on a Varian linear accelerator with a 40 pair multileaf collimator. The analysis of the experimental results demonstrates the feasibility and the potential of the method.
Service de physique médicale, institut Curie, Paris, France.
S
S
Papatheodorou
J C
JC
Rosenwald
M E
ME
Castellanos
S
S
Zefkili
L
L
Bonvalet
G
G
Gaboriaud
D000465:Algorithms; D004867:Equipment Design; D005240:Feasibility Studies; D006801:Humans; D007091:Image Processing, Computer-Assisted; D009068:Movement; D010315:Particle Accelerators; D019047:Phantoms, Imaging; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000295:instrumentation*; D014057:Tomography, X-Ray Computed
Utilisation d'un collimateur multilames pour la production de faisceaux modulés en intensité.