Abstract: The invention relates to a method for quality assurance of a radiation field (30) emitted by a radiation therapy apparatus (10), comprising the steps of: (i) providing an ionization chamber (40) detector as reference detector for measuring the dose of the radiation field (30) at the exit of the radiation head (20), said ionization chamber (40) having a size and being positioned for being traversed by said radiation beam (30), said ionization chamber (40) having an attenuation equivalent to less than 1 mm Al; (ii) providing one or more field detectors (50); moving the field detector (50) across the radiation field (30) and measuring simultaneously the dose from the field detector (50) and from the ionization chamber (40); (iii) computing the ratio of the dose from the field detector (50) to the dose of the ionization chamber (40). The invention also relates to a device for performing the method.

Abstract: The invention relates to a method for quality assurance of a radiation field (30) emitted by a radiation therapy apparatus (10), comprising the steps of: (i) providing an ionization chamber (40) detector as reference detector for measuring the dose of the radiation field (30) at the exit of the radiation head (20), said ionization chamber (40) having a size and being positioned for being traversed by said radiation beam (30), said ionization chamber (40) having an attenuation equivalent to less than 1 mm Al; (ii) providing one or more field detectors (50); moving the field detector (50) across the radiation field (30) and measuring simultaneously the dose from the field detector (50) and from the ionization chamber (40); (iii) computing the ratio of the dose from the field detector (50) to the dose of the ionization chamber (40). The invention also relates to a device for performing the method.

Abstract: The invention relates to a combined radiation therapy and magnetic resonance unit. For this purpose, in accordance with the invention a combined radiation therapy and magnetic resonance unit is provided comprising a magnetic resonance diagnosis part with an interior, which is limited in radial direction by a main magnet, and a radiation therapy part for the irradiation of an irradiation area within the interior, wherein at least parts of the radiation therapy part, which comprise a beam deflection arrangement, are arranged within the interior.

Abstract: The invention relates to a combined radiation therapy and magnetic resonance unit. For this purpose, in accordance with the invention a combined radiation therapy and magnetic resonance unit is provided comprising a magnetic resonance diagnosis part with an interior, which is limited in radial direction by a main magnet, and a radiation therapy part for the irradiation of an irradiation area within the interior, wherein at least parts of the radiation therapy part, which comprise a beam deflection arrangement, are arranged within the interior.

Abstract: The present invention is related to a water phantom for measuring and determining the dose distribution of radiation produced by a particle beam or photon radiation beam comprising: a water tank, the water tank having a lower base and side walls; supply means for supplying water to the water tank. The water tank comprises an intermediate base that forms, together with side walls and said lower base, a closed lower tank underneath said intermediate base and an upper tank above said intermediate base, the closed lower tank being connected to the supply means and allowing the flow of water toward said upper tank through a plurality of water admission passages defined in the intermediate base to provide an unturbulent water flow within said water tank 2.

Abstract: The invention relates to a combined radiation therapy and magnetic resonance unit. For this purpose, in accordance with the invention a combined radiation therapy and magnetic resonance unit is provided comprising a magnetic resonance diagnosis part with an interior, which is limited in radial direction by a main magnet, and a radiation therapy part for the irradiation of an irradiation area within the interior, wherein at least parts of the radiation therapy part, which comprise a beam deflection arrangement, are arranged within the interior.

Abstract: A system includes acquisition of a three-dimensional cone beam image, and determination of a dose to be delivered based on the three-dimensional image and on parameters of a treatment beam to deliver the dose. Some systems may include modification of a three-dimensional cone beam image to correct for scatter radiation, and determination of a dose based on the modified three-dimensional cone beam image.

Abstract: The present invention is related to a water phantom for measuring and determining the dose distribution of radiation produced by a particle beam or photon radiation beam comprising: a water tank, the water tank having a lower base and side walls; supply means for supplying water to the water tank. The water tank comprises an intermediate base that forms, together with side walls and said lower base, a closed lower tank underneath said intermediate base and an upper tank above said intermediate base, the closed lower tank being connected to the supply means and allowing the flow of water toward said upper tank through a plurality of water admission passages defined in the intermediate base to provide an unturbulent water flow within said water tank 2.

Abstract: A method for four-dimensional (4D) image verification in respiratory gated radiation therapy, includes: acquiring 4D computed tomography (CT) images, each of the 4D CT images representing a breathing phase of a patient and tagged with a corresponding time point of a first surrogate signal; acquiring fluoroscopic images of the patient under free breathing, each of the fluoroscopic images tagged with a corresponding time point of a second surrogate signal; generating digitally reconstructed radiographs (DRRs) for each breathing phase represented by the 4D CT images; generating a similarity matrix to assess a degree of resemblance in a region of interest between the DRRs and the fluoroscopic images; computing a compounded similarity matrix by averaging values of the similarity matrix across different time points of the breathing phase during a breathing period of the patient; determining an optimal time point synchronization between the DRRs and the fluoroscopic images by using the compounded similarity matrix;

Abstract: A system includes acquisition of a three-dimensional cone beam image, and determination of a dose to be delivered based on the three-dimensional image and on parameters of a treatment beam to deliver the dose. Some systems may include modification of a three-dimensional cone beam image to correct for scatter radiation, and determination of a dose based on the modified three-dimensional cone beam image.

Abstract: The invention relates to a combined radiation therapy and magnetic resonance unit. For this purpose, in accordance with the invention a combined radiation therapy and magnetic resonance unit is provided comprising a magnetic resonance diagnosis part with an interior, which is limited in radial direction by a main magnet, and a radiation therapy part for the irradiation of an irradiation area within the interior, wherein at least parts of the radiation therapy part, which comprise a beam deflection arrangement, are arranged within the interior.

Abstract: A system and method for delivering radiation to an object. A computer tomography machine generates CT data of the object. A radiation source with an output beam is directed to a predetermined irradiation field of the object. A detector above the object controls the output beam to the predetermined irradiation field of the object. A processor calculates the dose to the predetermined irradiation field of the object. Another detector below the object which measures the radiation delivered to the object.

Abstract: A system and method for delivering radiation to an object. A computer tomography machine generates CT data of the object. A radiation source with an output beam is directed to a predetermined irradiation field of the object. A detector above the object controls the output beam to the predetermined irradiation field of the object. A processor calculates the dose to the predetermined irradiation field of the object. Another detector below the object which measures the radiation delivered to the object.