| 摘要 |
An irradiation apparatus for irradiating by scanning a target volume according to a predetermined dose profile with a scanning beam of charged particles forming an irradiation spot on said target volume, said apparatus comprising: a beam generating device, a reference generator for computing, from said predetermined dose profile, through a dynamic inverse control strategy, the time evolution of commanded variables, these variables being the beam current I(t), the spot position settings x(t),y(t) and the scanning speed settings v<SUB>x</SUB>(t), v<SUB>y</SUB>(t), a monitor device having means for detecting at each time (t), the actual spot position as a measured position defined by the values x<SUB>m</SUB>(t),y<SUB>m</SUB>(t) on the target volume, characterised in that said irradiation apparatus further comprises means for determining the differences e<SUB>x</SUB>(t), e<SUB>y</SUB>(t) between the measured values x<SUB>m</SUB>(t), y<SUB>m</SUB>(t) and the spot position settings x(t) and y(t), and means for applying a correction to the scanning speed settings v<SUB>x</SUB>(t) and v<SUB>y</SUB>(t) depending on said differences e<SUB>x</SUB>(t), e<SUB>y</SUB>(t). The present invention is also related to a monitor for determining beam position in real-time.
|
