68 results about "Delivered radiation dose" patented technology

During treatment by brachytherapy, radiation passes beyond the target volume and delivers radiation dose to adjacent tissue such as the lungs and, especially in the case of treatment of the left breast, to the heart. The heart is particularly vulnerable to radiation; to minimise the dose it receives in such circumstances, we propose an apparatus for treatment by brachytherapy comprising an X-ray source sized for insertion into a patient, a respiration state monitor, and a control apparatus adapted to receive respiration state information from the respiration state monitor and control the output of the X-ray source; the control apparatus being arranged to operate the X-ray source at a first output level when the respiration state monitor indicates a degree of lung inflation above a first preset threshold and operate the X-ray source at a second and lower output level when the respiration state monitor indicates a degree of lung inflation below a second preset threshold.

A neutron capture therapy system includes a therapy table on which an irradiation target is placed, a neutron beam irradiation unit which irradiates the irradiation target placed on the therapy table with a neutron beam, a position measurement unit which measures a position of the irradiation target placed on the therapy table, and a radiation dose distribution output unit which outputs a radiation dose distribution of a neutron beam used for irradiating the irradiation target, based on an amount of positional misalignment of the position of the irradiation target measured by the position measurement unit.

The objective of the present invention is to provide a dosimeter container which contributes both to an increase in radiation dose measurement accuracy and a reduction in the size of a measuring device. The dosimeter container (10) of the present invention is provided with an accommodating portion (11) and a shielding portion (12) surrounding the accommodating portion (11). The accommodating portion (11) accommodates a radiation dose measuring instrument which measures a dose of prescribed radiation other than neutron beams. The shielding portion (12) comprises a member of a material which transmits the abovementioned prescribed radiation and shields neutron beams. The shielding portion (12) is preferably a sintered body of LiF, in particular a sintered body of 6LiF. The shielding portion(12) has at least two shielding portion constituent members (a main body portion (12A) and a lid portion (12B)), and adjacent members are capable of abutting one another, and more preferably capable of mating with one another. The size of the accommodating portion (11) is substantially the same as or larger than the size of the radiation dose measuring instrument, and the accommodating portion (11) extends through all the constituent members. The dosimeter container (10) is suitable for use as a dose measuring body (1) in which a radiation dose measuring instrument (51) is accommodated in theaccommodating portion (11).

A method for fiducial-less real-time motion tracking of abdominal tumors based on the correlation between the patient's breathing pattern and the diaphragm / lung border during treatment delivery. This invention utilizes an edge detection technique to delineate the diaphragm / lung border on radiographic images in order to calculate or determine tumor locations in the abdomen. The position of the diaphragm / lung border is synchronized with the breathing pattern obtained from continuous optical monitoring of a patient's respiratory cycle. The real-time optical breathing pattern obtained from monitoring is used to determine or calculate the position of the diaphragm / lung border during treatment delivery. The position of the diaphragm / lung border is then used to determine the tumor location in real-time. The target tumor coordinates generated through this process are used by the treatment delivery system to adjust the radiation beam geometry of the treatment delivery system to follow the tumor in real-time and accurately deliver radiation dose.

Example methods and systems are provided for performing radiation dose estimation on a target subject. In one example, radiation dose estimation may include obtaining projection image data acquired using an imaging system, generating partially reconstructed volumetric image data based on the projection image data, and generating partitions of the projection image data. Partially reconstructed volumetric image data may be associated with the first region of the total radiation field. The subregions may be associated with a second region of the total radiation field which is located in front of the first region from the direction of the radiation source. Radiation dose data for the target object may be estimated based on partially reconstructed volume image data associated with the first region and the partition associated with the second region.

Radiation dosimeters that are based on carbon materials such as carbon powder, carbon fibers, carbon nanoparticles and carbon nanotubes are developed. The dosimeter may contain a singular element or multiple sensing elements that are arrayed in 1-D, 2-D and 3-D formations. Each sensing element is made up of two electrodes with carbon materials deposited between the electrodes. The sensing elements may be deposited on flexible substrates to create flexible dosimeters. In addition, the carbon sensing materials may be deposited onto transparent substrates to achieve a transparent dosimeter. Transparent and / or flexible dosimeters can be fabricated with the carbon materials. The sensing elements are connected to external power sources. As the elements are exposed to radiation beams, the change in resistivity or conductance of the carbon materials is measured by current detection circuitry.

The embodiment of the invention discloses a radiation dose calculation device, device and storage medium. The device includes: one or more processors; a memory for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors perform the following operations: obtain the target The information corresponding to the object; according to the Monte Carlo algorithm and the information corresponding to the target object, determine the first dose distribution corresponding to the target object; use the first dose distribution and the information corresponding to the target object as the input of the preset neural network model, according to the preset The output result of the neural network model determines the second dose distribution corresponding to the target object; wherein, the accuracy of the second dose distribution is higher than the accuracy of the first dose distribution. Through the technical solutions of the embodiments of the present invention, faster calculation speed and higher calculation accuracy can be ensured to meet clinical needs.