MEASURING DEVICE FOR DISTRIBUTION IN SPACE energy flux density in the cross-sectional BEAM (pulsed and continuous) directional radiation of high intensity and photon energy and localization of individual organs PATIENT

摘要

The technical solution relates to the field of nuclear physics (apparatus for measuring nuclear radiation), and allows to measure the spatial distribution of energy density in the cross section of the beam of directed radiation of high intensity and high energy photons is intended mainly for use in medicine, during radioterapevticheskh procedures. The object of the invention to provide an apparatus free of the prior art drawbacks, which allows to measure the spatial distribution of energy density in the cross section of the beam of high intensity of high energy photons directed radiation, a technical result is not only a measurement of the spatial distribution of energy density in the cross section of the beam of radiation directed high the intensity of high energy photons, but also the localization of individual bodies from the patient uneven absorption capacity photons authorities. Also, when the dose field verification is possible at a reduced intensity photon beam, visible to individual organs and tissue of the patient, and in portal imaging is greatly facilitated the planning and conduct of radiotherapy treatments. This is achieved in that the device for measuring the spatial distribution of energy density in the cross section of the beam (pulsed and continuous) directional radiation of high intensity and energy of the photons and localization of specific organs of the patient comprising in a common enclosure filled with a gas flux converter in the secondary stream electrons, secondary electrons collimator and position-sensitive multi-electrode ionization chamber, the outputs of which are fed into the system obrabot ki and visualization of the distribution of the energy flux density of a beam of high intensity and energy of the directional radiation photons having N × M inputs is characterized in that the collimator of the secondary electrons is disposed between the converter photon radiation and multielectrode position-sensitive ionization chamber (MPCHIK), said chamber is in the form sections, each section consists of a common cathode and anode, wherein the anode is divided into strips which are oriented in the direction of the incident beam of photons, and output signals strip They are read in by the control circuit and a readout having N inputs; processing and visualization of the distribution of power density in the beam of a high intensity of high energy photons directed radiation. The apparatus is also characterized in that the anode strips made not more than 1 mm, a plurality of strips and the cathodes of all sections multielectrode position-sensitive ionization chamber forms a two-dimensional matrix consisting of horizontal rows and vertical columns, each element of the matrix serves to transfer the position of the test radiation field, and the length and width of the strips is selected based on the desired spatial resolution and detection efficiency of secondary electrons. Tests have shown the possibility of measuring device with the help of the spatial distribution of energy density in the cross section of the beam of high intensity of high energy photons directed radiation, i.e. produce verification dose field, and the ability to see the projection of objects having different absorbent capacity, i.e. implement portal imaging. 1 bp f-ly, 6 Fig.