Device for providing a radiation treatment
The present relates to a device for providing a radiation treatment to a patient comprising: —an electron source for providing a beam of electrons, and —a linear accelerator for accelerating said beam until a predetermined energy, and —a beam delivery module for delivering the accelerated beam from said linear accelerator toward the patient to treat a target volume with a radiation dose, The device further comprises intensity modulation means configured to modulate the distribution of the radiation dose in the target volume according to a predetermined pattern. The pattern is determined to match the dimensions of a target volume of at least about 50 cm 3 , and/or a target volume located at least about 5 cm deep in the tissue of the patient with said radiation dose, The radiation dose distributed is up to about 20 Gy delivered during an overall treatment time less than about 50 ms.
1 . A device for providing a radiation treatment to a patient, the device comprising:
an electron source for providing a beam of electrons, and
a linear accelerator for accelerating said beam to a predetermined energy, the accelerated beam being composed of a plurality of trains of electrons bunches, and
a beam delivery module for delivering the plurality of trains of electrons bunches from said linear accelerator toward the patient to treat a target volume with a radiation dose,
characterized in that the device further comprises an intensity modulation means configured to modulate distribution of a radiation dose in the target volume according to a predetermined modulation pattern matching the target volume,
the intensity modulation means are configured to adjust a position, a total charge and energy of each electrons bunch within a train and between trains of electrons bunches, and to separate the trains of electrons bunches depending on the total charge and/or energy of each train,
the modulation pattern comprising several subsections and each subsection of said several subsections comprising trains of electron bunches with a determined charge and energy to irradiate a corresponding portion of the target volume so that the intensity modulation means allows a set radiation dose received by each portion of the target volume,
the modulation pattern is determined to match the dimensions of the target volume wherein the target volume is at least about 50 cm 3 , and/or the target volume is located at least 5 cm deep in a tissue of the patient with said radiation dose,
the device being further characterized in that the radiation dose distributed by said intensity modulation means is at least 20 Gy, the radiation dose being delivered during an overall treatment time less than 50 ms.
2 . The device according to claim 1 , wherein the intensity modulation means are configured to further adjust an arrival angle, and projected size of each electrons bunch within a train and between trains of electrons bunches.
3 . The device according to claim 1 , wherein the entire radiation dose is of at least 30 Gy, or at least 35 Gy, or at least 40 Gy.
4 . The device according to claim 1 , wherein each portion receives a radiation dose up to an entire radiation dose.
5 . The device according to claim 1 , wherein each portion receives at least one train of electrons bunches.
6 . The device according to claim 1 , wherein the intensity modulation means comprises a charge variation means to set the charge of each train independently and direct each train to a predetermined subsection of the pattern to reach a corresponding portion of the target volume which modulates the distribution of radiation dose in the target volume.
7 . The device according to claim 1 , wherein the intensity modulation means comprises an energy variation means to set the energy of each train independently and direct each train to a predetermined subsection of the pattern to reach a corresponding portion of the target volume which modulates the distribution of radiation dose along the direction of the accelerated beam through the target volume.
8 . The device according to claim 7 , wherein each train has an energy which differs from 1% to 5%.
9 . The device according to claim 1 , wherein the accelerated electron beam is separated into a plurality of beam lines by a separating means, each beam lines being separated by a determined angle, and subsequently focusing each of said beam lines toward the patient to arrive in an overall time of less than 50 ms on the target volume, each beam line further comprising an independent intensity modulation means.
10 . The device according to claim 9 , wherein each beam line has an energy that differs from 10% to 40%.
11 . The device according to claim 1 , wherein the intensity modulation means comprises a deflecting means for deflecting each train of electrons bunches position transversely relative to the accelerated beam direction, said deflecting means having a deflecting speed faster than the interspacing time between two subsequent trains.
12 . The device according to claim 11 , wherein the deflecting means comprises a magnet.
13 . The device according to claim 11 , wherein the deflecting means comprises a radio frequency deflector.
14 . The device according to claim 1 , wherein the energy variation means is set for implementing predetermined energy variations between each train of electrons bunches, said energy variation means being operated from the linear accelerator.
15 . The device according to claim 14 , wherein the energy variation means is operated by controlling an amplitude and the phase of the radiofrequency pulses of the linear accelerator.
16 . The device according to claim 1 , wherein the intensity modulation means comprises a combination of charge variation means, energy variation means, deflection means and multiple beam lines.
17 . The device according to claim 1 , wherein the accelerated electron beam has a predetermined energy between 30 MeV and 250 MeV, or between 50 MeV and 250 MeV, or between 50 MeV and 150 MeV.