METHOD FOR EXPERIMENTAL EVALUATION OF DOSE PROFILES OF MULTI-SLICE COMPUTED TOMOGRAPHS FOR DETERMINING DOSE INDEX OF COMPUTED TOMOGRAPHS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2021 - IPC A61B6/03 G01T7/00 G01D18/00 G01N23/46 

FIELD: equipment for testing X-ray devices.

SUBSTANCE: invention relates to the field of equipment for testing X-ray devices. According to the claimed invention, the multispiral CT (MSCT) dose indicator is evaluated for two combinations of acquisition parameters in the head and body examination modes. For this purpose, the total dose distribution is recorded in one revolution of the X-ray emitter due to the height of the test objects “head” and “body” equal to 400 mm, as well as due to the length of the sensitive area of the measuring device equal to 380 mm. Dose distributions are recorded sequentially in the central and four peripheral regions of each of the test objects. For the dose profiles obtained in this way, the integral dose values are calculated, while the value of D_center corresponds to the integral dose value obtained in the central region of the test object, and the value of D_peripheral is the average value of the integral dose levels obtained for all peripheral regions. The quotient of dividing D_center and D_peripheral by the value of the X-ray beam width gives an estimate of the dose index in the central region of the test objects and on the periphery, respectively, and the result of summing the obtained quotients using weighting coefficients 1/3 and 2/3, respectively, is an estimate of the weighted dose index of MSCT. The device includes a set of two test objects in the form of a test object “head” with a diameter of 160 mm and a height of 400 mm and a test object “body” with a diameter of 320 mm and a height of 400 mm, in which the central and peripheral holes are made, and in the test object “head” the central hole with a diameter of 13 mm is blind and is made to a depth of 380 mm, and in the test object “body” the central hole is through and has a diameter of 160 mm, the peripheral holes of both test objects are blind and have diameters of 13 mm and a depth of 380 mm, measuring device with a height of 400 mm and a diameter of 13 mm with thermoluminescent dosimeters, as well as plugs in the amount of 8 pieces with a diameter of 13 mm and a height of 400 mm.

EFFECT: invention provides an increase in the accuracy of determining the dose index of multi-slice computed tomographs (MSCT) in the conditions of clinical use of the equipment.

2 cl, 8 dwg