X-ray ct apparatus and x-ray ct fluoroscopic apparatus
A technology of X-ray and equipment, applied in the field of X-ray CT image reconstruction method and X-ray CT equipment, which can solve the problems such as difficulty in radiation exposure
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Embodiment 3
[0114] Considering that for the collimator of Embodiment 3, a shielded cylindrical shape (eccentric cylindrical collimator that deviates from the rotation axis) (Figure 4) or a shielded plate shape (plate collimator) (Figure 5) can be conceived for the collimator of embodiment 3, so according to the present invention, this Both collimators are suitable. When DAS25 reads the z-channel data to complete the collimator control in the z-direction (slice thickness direction), execute the collimator control in the channel direction by the following, that is, find out in advance the X-ray detection that will be incident on multiple lines The position of the X-ray on the detector 25 is determined by the angle β (observation angle β) of the X-ray data acquisition line and the position and size of the region of interest to be imaged, and is based on the aperture of the collimator in the direction of the channel. Position and aperture width are feed forward control. Moreover, the value of the...
Embodiment 4
[0270] Although Embodiment 3 is described with reference to the channel direction X-ray collimator 31, the use of the beam-forming X-ray filter 32 as shown in FIG. 31 can produce similar effects.
[0271] FIG. 31 shows the normal position of the beamed X-ray filter, that is, when the amount of movement in the channel direction is zero.
[0272] Fig. 32 and Fig. 33 show examples in which the movement amounts of the beam-forming X-ray filter are Δd1 and Δd2, respectively. In this case, the control can be completed so that the straight line connecting the center of the region of interest and the X-ray focal point overlaps the X-ray propagation path of the beamed X-ray filter 32 constituting the shortest straight line.
[0273] In order to achieve their overlap:
[0274] Mathematical expression 19
[0275] γ mean =(γ max +γ min ) / 2
[0276] For the distance from the X-ray focal point to the beam forming filter indicated by D as shown in FIG. 31, the following holds.
[0277] Δdi=D·tan...
Embodiment 5
[0280] An example in which the present invention is applied to an X-ray CT fluoroscopy apparatus is shown in FIG. 34. First, in step S1, the entire X-ray tomographic image is imaged.
[0281] Next, in step S2, a region of interest to be imaged is set on the X-ray tomographic image imaged in step S1. When setting the region of interest, the operator in the scanning room equipped with the gantry 20 sets the region of interest by using the X-ray CT fluoroscopy operation panel 33 provided at hand.
[0282] Then in step S3, the channel direction collimator 31 or the shape X-ray collimator 32 irradiates the region of interest or its center in the channel direction with X-rays during tracking to collect projection data in the region of interest.
[0283] Then in step S4, as shown in FIG. 3, correction of the projection data is performed based on the entire cross-sectional area, and image reconstruction is performed on the corrected projection data.
[0284] Then in step S5, it is checked...
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