CN104138270A - Section device for CT (computed tomography) machine, CT scanning system and scanning method implemented by same - Google Patents
Section device for CT (computed tomography) machine, CT scanning system and scanning method implemented by same Download PDFInfo
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- CN104138270A CN104138270A CN201310170403.6A CN201310170403A CN104138270A CN 104138270 A CN104138270 A CN 104138270A CN 201310170403 A CN201310170403 A CN 201310170403A CN 104138270 A CN104138270 A CN 104138270A
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Abstract
The invention discloses a section device for a CT (computed tomography) machine. The section device comprises two supporting devices and a section assembly. The two supporting devices are opposite to each other, the section assembly is erected between the two supporting devices and is provided with two sections and an opening, the opening is formed in a gap between the two sections, a transmission gear is arranged on each supporting device and comprises a ball screw and a nut seat, the ball screws are assembled on the corresponding supporting devices, each nut seat is assembled on the corresponding ball screw and is connected with an end of the corresponding section of the section assembly, the nut seats axially move along the ball screws when the ball screws rotate, and accordingly the size of the opening in the gap between the two sections of the section assembly can be adjusted. The section device has the advantage that the ineffective X-ray dose can be greatly reduced on the premise that required data can be assuredly detected. The invention further discloses a CT scanning system and a scanning method implemented by the CT scanning system.
Description
Technical field
The present invention relates to medical imaging technology field, relate in particular to a kind of CT slicing device, CT scan system and scan method thereof for machine.
Background technology
Current third-generation computer tomographic system (being multi-slice Spiral CT system) all can start to scan, after detected person's position to be scanned, continue to scan certain distance by certain distance in order to obtain the data of sufficient image reconstruction, guarantee to rebuild the picture quality of image in the process of detected person being carried out to diagnosis of scans before detected person's position to be scanned, as shown in Figure 1.The process that certain distance starts to scan before position to be scanned is called prescan, and the process that continues scanning certain distance after position to be scanned is called overscanning.In the process of using multi-slice Spiral CT system to scan detected person, because there is prescan and overscanning, can make detected person receive useless irradiation or dosage radiation, cause the waste of radiation dose simultaneously.
For overcome that existing multi-slice Spiral CT system occurs in scanning process because prescan and overscanning cause detected person to receive the problem of useless dosage radiation, Chinese invention patent is announced 1846620B patent and has been disclosed a kind of CT scan system for clinical disease diagnosis.This CT scan system comprises having a rotary frame for the scanning chamber of detected person turnover, be mounted on rotary frame x-ray source for generation of X ray, be mounted on rotary frame and and the detector array that is oppositely arranged of x-ray source, the computer system that is mounted on the cam gear in frame and between x-ray source and detected person and is electrically connected with detector array.Computer system comprises that the data collecting system being electrically connected with detector array, the signal collecting according to data collecting system carry out the image reconstruction unit of image reconstruction and for the image-display units of displayed map picture.
Detector array is for receiving through detected person's X ray and converting the X ray receiving to the signal of telecommunication.The signal of telecommunication that data collecting system is changed for acquisition testing device array also converts the electrical signal to digital signal.Image reconstruction unit is carried out image reconstruction according to the digital signal of data collecting system conversion.Cam gear comprise the first eccentric, can relative the first wobbler action the second eccentric, drive first eccentric the first driving device and drive second eccentric the second driving device.Between the first eccentric and the second eccentric, be formed with the opening passing for X ray.This CT scan system drives the first eccentric, the second driving device to drive the second eccentric adjustment to be formed at the size of the opening between the first eccentric and the second eccentric by the first driving device of cam gear, and then adjust the range of exposures of X ray, thereby avoid occurring that prescan causes detected person to receive the problem that useless dosage radiation and radiation dose are wasted with overscanning in scanning process.But, because this CT scan system is used for controlling the complex structure of cam gear of the range of exposures of X ray, and higher to the first eccentric of cam gear, the second eccentric required precision, can there is processing difficulties, problem that processing cost is high.
In addition, Chinese invention patent is announced No. 102113983B and has been disclosed a kind of multi-slice Spiral CT method, although the method can reduce the waste of the radiation dose that multi-layer spiral CT causes because of prescan and overscanning in scanning process, but the adjustment process in the method is comparatively complicated, and do not disclose the size of how controlling the opening passing for X ray by machinery.
In view of above-mentioned condition, necessary a kind of CT slicing device, CT scan system and scan method thereof for machine, the problem existing to solve prior art of providing.
Summary of the invention
The object of the present invention is to provide a kind of simple in structure, handling ease, can cut down finished cost and can reduce in scanning process and to cause CT that radiation dose wastes slicing device, CT scan system and scan method thereof for machine because of prescan and overscanning.
CT machine of the present invention adopts following technical scheme to realize with slicing device: a kind of CT machine slicing device, comprise two bracing or strutting arrangements that are oppositely arranged and be set up between two bracing or strutting arrangements and there is the section assembly of two sections, described section assembly has the opening being formed by the interval between two sections, on described two bracing or strutting arrangements, be respectively provided with an actuating device, described each actuating device comprises the nut seat that is mounted on the ball-screw on corresponding bracing or strutting arrangement and is mounted on ball-screw and is connected with one end of the respective slice of section assembly, described ball-screw is provided with screw thread, described nut seat is provided with screwed hole, the threaded engagement of described screwed hole and described ball-screw also makes nut seat along ball-screw, make the size of the opening between two sections of axially-movable and then adjustment section assembly when ball-screw rotates.
Preferably, on the nut seat of described two actuating devices, each group is provided with a connector, and the nut seat of described actuating device is being connected of respective slice with section assembly by connector.
Preferably, the nut seat of described actuating device comprises and is mounted on the screw on ball-screw and is mounted on the contiguous block on screw, described screwed hole is located on described screw, described connector is mounted on the contiguous block of nut seat, and described contiguous block is connected with one end of the respective slice of described section assembly by connector.
Preferably, described connector comprises the first fixed part and the second fixed part being connected with the first fixed part, and described the first fixed part is fixedly connected with the contiguous block of the nut seat of actuating device, and described the second fixed part is connected with one end of the respective slice of section assembly.
Preferably, the first fixed part of described connector is vertical tabular setting, and described the second fixed part is arranged by the rear horizontal-extending of the first fixed part bending.
Preferably, the L-shaped setting of described connector.
Preferably, described two bracing or strutting arrangements are the first bracing or strutting arrangement and the second bracing or strutting arrangement, and two sections of described section assembly include the first end being fixed on the first bracing or strutting arrangement, the arcuation pars intermedia that is fixed to the second end on the second bracing or strutting arrangement and connects first end and the second end.
Preferably, two sections of described section assembly are the first section and the second section, described two actuating devices are be mounted on the first actuating device on the first bracing or strutting arrangement and be mounted on the second actuating device on the second bracing or strutting arrangement, connector on the described nut seat that is mounted on the first actuating device is the first connector, connector on the described nut seat that is mounted on the second actuating device is the second connector, the nut seat of described the first actuating device is fixedly connected with the first end of the first section by the first connector, the nut seat of described the second actuating device is fixedly connected with the second end of the second section by the second connector.
Preferably, described the first bracing or strutting arrangement is provided with the first guide rail, described the second bracing or strutting arrangement is provided with second guide rail corresponding with the first guide rail of the first bracing or strutting arrangement, the first end of two sections of described section assembly is all fixedly mounted on the first guide rail of the first bracing or strutting arrangement, and the second end of two sections of described section assembly is all fixedly mounted on the second guide rail of the second bracing or strutting arrangement.
Preferably, the first guide rail of described the first bracing or strutting arrangement is provided with can be along the first slider guide and second slider guide of its slip, the first end of the first section of described section assembly is fixedly connected with the first slider guide, and the first end of the second section of described section assembly is fixedly connected with the second slider guide.
Preferably, the second guide rail of described the second bracing or strutting arrangement is provided with can be along the 3rd slider guide and the 4th slider guide of its slip, the second end of the first section of described section assembly is fixedly connected with the 3rd slider guide, and the second end of the second section of described section assembly is fixedly connected with the 4th slider guide.
Preferably, the first fixed part of described the first connector is fixedly mounted on the contiguous block of nut seat of the first actuating device, and the second fixed part of described the first connector is fixedly connected with the first slider guide of the first guide rail.
Preferably, the first fixed part of described the second connector is fixedly mounted on the contiguous block of nut seat of the second actuating device, and the second fixed part of described the second connector is fixedly connected with the 4th slider guide of the second guide rail.
Preferably, be equipped with first supporting seat and second supporting seat relative with the first supporting seat on described two bracing or strutting arrangements, the ball-screw of described actuating device is set up between first supporting seat and the second supporting seat of respective support device.
Preferably, described the first supporting seat is provided with accepting hole, described the second supporting seat is provided with second accepting hole corresponding with the first accepting hole, the ball-screw of described actuating device has the first axle part coordinating with the first accepting hole of the first supporting seat and the second axle part coordinating with the second accepting hole of the second supporting seat, and described screw thread is between the first axle part and the second axle part.
Preferably, described CT machine also comprises the driving device of ball-screw rotation of drive transmission and the shaft coupling of the ball-screw of connecting drive device and actuating device with slicing device.
Preferably, the first axle part of described ball-screw axially stretches out and is provided with the 3rd axial region being connected with driving device.
Preferably, on described bracing or strutting arrangement, be also provided with the gripper shoe of support drive device.
Preferably, described CT machine also comprises reset prompting apparatus with slicing device, and described reset prompting apparatus comprises the photoelectricity contact on the nut seat that is fixed on the photoswitch on bracing or strutting arrangement and is fixed on actuating device.
Preferably, the photoelectricity contact of described reset prompting apparatus is fixedly mounted on the contiguous block of screw of nut seat of actuating device.
CT scan system of the present invention realizes in the following way: a kind of CT scan system, the rotary frame that comprises the test chamber with the detected body turnover of a confession, for carrying the sick bed of detected body, be mounted on the x-ray source on rotary frame, the detector array and the computer system that are mounted on rotary frame and are oppositely arranged with x-ray source, described CT scan system also comprises above-mentioned slicing device, described slicing device is mounted on rotary frame and between x-ray source and the test chamber of rotary frame, the size of the opening that described CT scan system is formed by the interval between two sections of the assembly of cutting into slices by adjustment slicing device in scanning process is adjusted the fan-beam thickness through the X-ray beam of opening.
Preferably, described computer system comprise CPU, be connected with CPU and for control relative motion between the section of slicing device section control unit, be connected with CPU and for controlling the sick bed control unit of bed motion, from the data acquisition unit of detector array acquired signal, carry out the image reconstruction unit of image reconstruction and show the image-display units of rebuilding image according to the signal of data acquisition unit collection.
Preferably, described section control unit comprises the second section control unit of the first section control unit of motion of a section controlling section assembly and the motion of another section of control section assembly.
CT scan method of the present invention realizes in the following way: a kind of CT scan method, comprise the steps: to provide CT scan system as above, described sick bed is along the axial direction turnover test chamber of the test chamber of rotary frame, two sections of the section assembly of described slicing device start anteposition in initial position in scanning, spacing between two sections of described section assembly is zero when two sections are positioned at initial position, the joint place plane of described two sections overlaps with the central plane of detector array during in initial position in two sections of section assembly, determine that sick bed enters the pace of test chamber in scanning process along the axial direction of the test chamber of rotary frame, drive two actuating devices of slicing device make two sections along and the sick bed direction that enters the opposite direction of test chamber move until the joint place planes of two sections to the distance of the central plane of detector array reach first apart from time stop driving two actuating devices of slicing device, drive sick bed to make sick bed with the pace of sick bed, enter test chamber along the axial direction of the test chamber of rotary frame, in the leading edge place plane of the imaging region at the position to be scanned of the detected body on sick bed, when reaching second distance, the distance of the central plane of detector array drive the direction that section that an actuating device in two actuating devices of slicing device makes to be connected with this actuating device enters test chamber along sick bed move and increase the interval between two sections, so that the X ray that x-ray source produces is through the interval between two sections and then irradiate the position to be scanned of detected body, interval between two sections reach the 3rd apart from time stop driving this actuating device, the back edge place plane of the imaging region at the position to be scanned of the detected body on sick bed to the distance of the central plane of detector array reach the 4th apart from time drive the direction that section that another actuating device in two actuating devices of slicing device makes to be connected with this actuating device enters test chamber along sick bed move and dwindle the interval between two sections, between two sections be spaced apart zero time stop driving this actuating device, when checking end, stop driving sick bed.
Preferably, the actuating device that described two actuating devices first drive in scanning process is the first actuating device, and an actuating device of rear drive is the second actuating device, and the section being connected with the first actuating device is the first section; The section being connected with the second actuating device is the second section.
Preferably, described the first distance L
1by following formula, obtain: L
1=R
1* D/ (2*R
2), wherein, R
1for the distance between x-ray source and the section of section assembly, the width that D is detector array, R
2for the distance between x-ray source and detector array.
Preferably, described second distance L
2by following formula, obtain: L
2=R
0* D/ (2*R
2), wherein, R
0for the distance between x-ray source and scanning center, the width that D is detector array, R
2for the distance between x-ray source and detector array.
Preferably, described the 3rd distance L
3by following formula, obtain: L
3=R
1* D/R
2, wherein, R
1for the distance between x-ray source and the section of section assembly, the width that D is detector array, R
2for the distance between x-ray source and detector array.
Preferably, described the 4th distance L
4by following formula, obtain: L
4=R
0* D/ (2*R
2), wherein, R
0for the distance between x-ray source and scanning center, the width that D is detector array, R
2for the distance between x-ray source and detector array.
Preferably, the pace that described the first section enters movement velocity that the direction of test chamber moves and sick bed along sick bed is proportional.
Preferably, the movement velocity V of described the first section
1by following formula, obtain: V
1=R
1* V/R
0, wherein, R
1for the distance between x-ray source and the section of section assembly, R
0for the distance between x-ray source and scanning center, the pace that V is sick bed.
Preferably, the pace that described the second section enters movement velocity that the direction of test chamber moves and sick bed along sick bed is proportional.
Preferably, the movement velocity V of described the second section
2by following formula, obtain: V
2=R
1* V/R
0, wherein, R
1for the distance between x-ray source and the section of section assembly, R
0for the distance between x-ray source and scanning center, the pace that V is sick bed.
CT scan system structure of the present invention is succinct, easy and simple to handle, and manufacturing cost is lower, and employing slicing device, synchronously realizes the dynamic adjustment of scanning area and imaging region, and scanning area and imaging region are overlapped completely, both avoid invalid radiation, reduced again the suffered radiation dose of patient.
CT scan method of the present invention can guarantee that detection obtains, under the prerequisite of desired data, greatly reducing X ray ineffective dose, and its ray slip has reached 25% compared with prior art.CT scan method of the present invention, by scanning incipient stage and end of scan stage, is controlled respectively the folding of two arc sections, thereby ray scanning region and imaging region is overlapped completely, has removed invalid radiation in prescan and overscanning process.
Accompanying drawing explanation
The schematic diagram of scanning area and imaging region when Fig. 1 is existing spiral CT system scanning;
Fig. 2 is the axonometric chart of the slicing device of CT scan system of the present invention;
Fig. 3 is the section assembly of slicing device of CT scan system of the present invention and the constitutional diagram of guide assembly;
Fig. 4 is the top view of the slicing device shown in Fig. 2;
Fig. 5 is the cutaway view along A-A direction in Fig. 4;
Fig. 6 is the cutaway view along B-B direction in Fig. 4;
Fig. 7 is the schematic diagram of CT scan system of the present invention;
Fig. 8 is the structural representation of the rotary frame of CT scan system of the present invention;
Fig. 9 is the flow chart of CT scan method of the present invention;
Figure 10 is the schematic diagram of each parts relative position during the stage in normal scan of CT scan system of the present invention;
Figure 11 is the schematic diagram of the dynamic adjustment process of slicing device of the present invention in scanning process.
The specific embodiment
In conjunction with following specific embodiments and the drawings, the present invention is described in further detail.Implement process of the present invention, condition, experimental technique etc., except the content of mentioning specially below, be universal knowledege and the common practise of this area, the present invention is not particularly limited content.
Refer to shown in Fig. 2 to Fig. 8 detector array 4 and computer system 6 that CT scan system 100 of the present invention comprises rotary frame 5, be mounted on x-ray source 2 on rotary frame 5, be mounted on rotary frame 5 and be oppositely arranged with x-ray source.Described rotary frame 5 has the test chamber 51 of detected body 7 turnover of a confession.Described CT scan system 100 also comprises the slicing device 1 that is mounted on rotary frame 5 and between x-ray source 2 and the test chamber 51 of rotary frame 5 and for carrying detected body 7 and along the sick bed 3 of the axial direction turnover test chamber 51 of test chamber 51.Described x-ray source 2 is for generation of the X ray that penetrates detected body 7.Described detector array 4 is for receiving through being detected the X ray of body 7 and the signal receiving being converted to the signal of telecommunication.The X-ray beam that described slicing device 1 capable of regulating x-ray source 2 produces is along the fan-beam thickness of the axial direction of detection strong 51, thus the dosage of the radiation that the detected body 7 of control receives.
Please consult shown in Fig. 2 to Fig. 6 by emphasis, described slicing device 1 comprises the bracing or strutting arrangement 14 that is mounted on rotary frame 5, be set up in section assembly 11 on bracing or strutting arrangement 14, be mounted on actuating device 12 on bracing or strutting arrangement 14, connect the driving device 13 that connector 16 and the drive transmission 12 of section assembly 11 and actuating device 12 rotate.Described bracing or strutting arrangement 14 comprises the first bracing or strutting arrangement 141 and the second bracing or strutting arrangement 140 being oppositely arranged.Described section assembly 11 is set up between the first bracing or strutting arrangement 141 and the second bracing or strutting arrangement 140, comprises first section the 111 and second section 110 that structure is identical.Described actuating device 12 comprises and is mounted on the first actuating device 121 on the first bracing or strutting arrangement 141 and is mounted on the second actuating device 120 on the second bracing or strutting arrangement 140.Described driving device 13 comprises the second driving device 130 that drives the first driving device 131 of the first actuating device 121 rotations and drive the second actuating device 120 to rotate.Described connector 16 comprises and connects first one end of section 111 and the first connector 161 of the first actuating device 121 and be connected one end of the second section 110 and the second connector 160 of the second actuating device 120.Described the first actuating device 121 drives the first section 111 motions by the first connector 161 under the driving of the first driving device 131.Described the second actuating device 120 drives the second section 110 motions by the second connector 160 under the driving of the second driving device 130.In the present embodiment, driving device 13 is motor.
Please consult shown in Fig. 3 by emphasis, first section the 111, second section 110 of described section assembly 11 includes the first end 1112,1102 that is oppositely arranged with the second end 1111,1101 and is connected first end 1112,1102 and the arcuation pars intermedia 1110,1100 of the second end 1111,1101.The first end 1112 of described the first section 111, the first end 1102 of the second section 110 are all fixedly mounted on the first bracing or strutting arrangement 141 by bolt (not label).The second end 1111 of described the first section 111, the second end 1101 of the second section 110 are all fixedly mounted on the second bracing or strutting arrangement 140 by bolt (not shown).Described first section 111 one end that are connected with the first actuating device 121 are its first end 1112, and described second section 110 one end that are connected with the second actuating device 120 are its second end 1101.
Described the first connector 161 is identical with the second connector 160 structures, all L-shaped settings.The second fixed part 1611,1601 that described the first connector 161, the second connector 160 include the first vertically tabular fixed part 1610,1600 and arranged by the rear horizontal-extending of the first fixed part 1610,1600 bottom bending.The first fixed part 1610 of described the first connector 161 is fixedly connected with the first actuating device 121 by bolt (not label).The second fixed part 1611 of described the first connector 161 is fixedly connected with the first end 1112 of the first section 111 by bolt (not label).The first fixed part 1600 of described the second connector 160 is fixedly connected with the second actuating device 120 by bolt (not label).The second fixed part 1601 of described the second connector 160 is fixedly connected with the second end 1101 of the second section 110 by bolt (not label).
Please consult shown in Fig. 2, Fig. 4 to Fig. 6 by emphasis, described the first actuating device 121 is identical with the structure of the second actuating device 120, includes ball-screw 1210,1200 and is mounted on the nut seat 1211,1201 on ball-screw 1210,1200.Described ball-screw 1210,1200 is provided with screw thread 12100,12000.Described nut seat 1211,1201 comprises the screw 12110,12010 being mounted on ball-screw 1210,1200 and is fixedly mounted on the contiguous block 12111,12011 on screw 12110,12010.Described screw 12110,12010 is provided with screwed hole 12112,12012, can coordinate with the screw thread 12100,12000 of ball-screw 1210,1200, so that nut seat 1211,1201 is done axially-movable along ball-screw 1210,1200.The ball-screw 1210 of described the first actuating device 121 is mounted on the first bracing or strutting arrangement 141, and the ball-screw 1200 of described the second actuating device 120 is mounted on the second bracing or strutting arrangement 140.The first fixed part 1610 of described the first connector 161 is fixedly connected with the contiguous block 12111 of the nut seat 1211 of the first actuating device 121 by bolt (not label).The first fixed part 1600 of described the second connector 160 is fixedly connected with the contiguous block 12011 of the nut seat 1201 of the second actuating device 120 by bolt (art label).
The first bracing or strutting arrangement 141 of described bracing or strutting arrangement 14, the second bracing or strutting arrangement 140 structures are identical.Described the first bracing or strutting arrangement 141 is provided with the first guide rail 1410, and described the second bracing or strutting arrangement 140 is provided with second guide rail 1400 corresponding with the first guide rail 1410 of the first bracing or strutting arrangement 141.The first guide rail 1410 of described the first bracing or strutting arrangement 141 is provided with the first slider guide 1411 and second slider guide 1412 that can slide along tool.The first end 1112 of described the first section 111 and the second fixed part 1611 of the first connector 161 are fixed on the first slider guide 1411 of the first guide rail 1410 by bolt (not label).The first end 1102 of described the second section 110 is fixed on the second slider guide 1412 of the first guide rail 1410 by bolt (not label).The second guide rail 1400 of described the second bracing or strutting arrangement 140 is provided with can be along the 3rd slider guide 1401 and the 4th slider guide 1402 of its slip.The second end 1111 of described the first section 111 is fixed on the 3rd slider guide 1401 of the second guide rail 1400 by bolt (not label).The second end 1101 of described the second section 110 and the second fixed part 1601 of the second connector 160 are fixed on the 4th slider guide 1402 of the second guide rail 1400 by bolt (not label).
Described the first bracing or strutting arrangement 141, the second bracing or strutting arrangement 140 all have the first supporting seat 1413,1403 and the second supporting seat 1415,1405 being oppositely arranged.The ball-screw 1210 of described the first actuating device 121 is set up between first supporting seat 1413 and the second supporting seat 1415 of the first bracing or strutting arrangement 141.The ball-screw 1200 of described the second actuating device 120 is set up between first supporting seat 1403 and the second supporting seat 1405 of the second bracing or strutting arrangement 140.Described the first supporting seat 1413,1403 is provided with the first accepting hole 14130,14030 laterally running through.Described the second supporting seat 1415,1405 is provided with second accepting hole 14150,14050 corresponding with the first accepting hole 14130,14030 of the first supporting seat 1413,1403.Described ball-screw 1210,1200 has the first axle part 12101,12001 coordinating with the first accepting hole 14130,14030 of the first supporting seat 1413,1403, the second axle part 12102,12002 coordinating with the second accepting hole 14150,14050 of the second supporting seat 1415,1405.The screw thread 12100,12000 of described ball-screw 1210,1200 is between the first axle part 12101,12001 and the second axle part 12102,12002.Described ball-screw 1210,1200 also comprises by axial outward extending the 3rd axial region 12103,12003 of the first axle part 12101,12001.On described the first bracing or strutting arrangement 141, be also provided with for supporting the first gripper shoe 1414 of the first driving device 131.Described the second bracing or strutting arrangement 140 is provided with for supporting the second gripper shoe 1404 of the second driving device 130.Described the first gripper shoe 1414, all L-shaped settings of the second gripper shoe 1404.The 3rd axial region 12103 of the ball-screw 1210 of described the first actuating device 121 is connected with the first driving device 131 by the first shaft coupling 1214.The 3rd axial region 12003 of the ball-screw 1200 of described the second actuating device 120 is connected with the second driving device 130 by the second shaft coupling 1204.
Described slicing device 1 also comprises the reset prompting apparatus 15 being mounted on bracing or strutting arrangement 14.Described reset prompting apparatus 15 comprises the first reset prompting apparatus 151 of being mounted on the first bracing or strutting arrangement 141 and is mounted on the second reset prompting apparatus 150 on the second bracing or strutting arrangement 140.Described the first reset prompting apparatus 151 is identical with the second reset prompting apparatus 150 structures.Described the first reset prompting apparatus 151 comprises the first photoelectricity contact 1510 on the contiguous block 12111 of the nut seat 1211 that is fixed on the first photoswitch 1511 on the first bracing or strutting arrangement 141 and is fixed to the first actuating device 121.Described the first photoelectricity contact 1510 can coordinate with the first photoswitch 1511, and whether the first section 111 moving under the drive of the first actuating device 121 in order to judgement gets back to initial zero-bit.Described the second reset prompting apparatus 150 comprises the second photoelectricity contact 1500 on the contiguous block 12011 of the nut seat 1201 that is fixed on the second photoswitch 1501 on the second bracing or strutting arrangement 140 and is fixed to the second actuating device 120.Described the second photoelectricity contact 1500 can coordinate with the second photoswitch 1501, in order to judgement, with the second section 110 of the second actuating device 120 motions, whether gets back to initial zero-bit.
Described slicing device 1 is fixedly connected with the contiguous block 12111 of the nut seat 1211 of the first actuating device 121 by the first fixed part 1610 of the first connector 161, the second fixed part 1611 of the first connector 161 is fixedly connected with the first end 1112 of the first section 111, the first fixed part 1600 of the second connector 160 is fixedly connected with the contiguous block 12011 of the nut seat 1201 of the second actuating device 120, the second fixed part 1601 of the second connector 160 is fixedly connected with and the first end of the first section 111 1112 is connected on the first actuating device 121 with the second end 1101 of the second section 110, the second end 1101 of the second section 110 is connected on the second actuating device 120, thereby realize, when driving the ball-screw 1210 of the first actuating device 121 to rotate, the first driving device 131 make the nut seat 1211 of the first actuating device 121 drive the first section 111 along the first guideway 1410 when ball-screw 1210 is done returning of axially-movable, the second guide rail 1400 slides, when driving the ball-screw 1200 of the second actuating device 120 to rotate, the second driving device 130 make the nut seat 1201 of the second actuating device 120 drive the second section 110 along the first guide rail 1410 when ball-screw 1200 is done returning of axially-movable, the second guide rail 1400 slides, thereby by actuating device 12, realize the spacing between first section the 111 and second section 110 of adjusting section assembly 11, the size of the opening 112 that i.e. adjustment section assembly 11 is formed by the interval between section 111 and the second section 110.
Please consult shown in Fig. 7 by emphasis, described computer system 6 comprises CPU 61, be connected with CPU 61 and for controlling the first section 111 and second of the section assembly 11 of slicing device 1 111 section control units 62 of relative motion between the two of cutting into slices, the sick bed control unit 63 that is connected with CPU 61 and moves for controlling sick bed 3, data acquisition unit 64 from detector array 4 acquired signal, the signal gathering according to data acquisition unit 64 carries out the image reconstruction unit 65 of image reconstruction and shows the image-display units 66 of rebuilding image.Described section control unit 62 comprises the first section control module 621 being connected with the first driving device 131 and the second section control module 622 being connected with the second driving device 130.Described the first section control module 621 is controlled the motion of the first section 111 of section assembly 11 by controlling the rotation of the first driving device 131.Described the second section control module 622 is controlled the motion of the second section 110 of section assembly 11 by controlling the rotation of the second driving device 130.
CT scan system 100 of the present invention is controlled the rotation of the first driving device 131 by the first section control module 621 of section control unit 62, and then control the motion of the first actuating device 121 is connected with the first driving device 131, thereby first 111 the moving along the first guide rail 1410, the second guide rail 1400 of cutting into slices that control is connected with the first actuating device 121; By the second section control module 622 of section control unit 62, control the rotation of the second driving device 130, and then control the motion of the second actuating device 120 is connected with the second driving device 130, thereby second 110 the moving along the first guide rail 1410, the second guide rail 1400 of cutting into slices that control is connected with the second actuating device 120.Thus, CT scan system 100 is adjusted slicing device 1 by the big or small object of the opening 112 that forms of interval between two sections of section assembly 11 in scanning process, and then realizes adjustment through the object of the fan-beam thickness of the X-ray beam of opening 112.
Figure 9 shows that and adopt CT scan system 100 of the present invention to carry out the schematic flow sheet of CT scan.Figure 10 shows that each parts of CT scan system 100 of the present invention are at the schematic diagram in normal scan relative position during the stage.The section assembly 11 of the slicing device 1 of CT scan system 100 to the distance between x-ray source 2 is designated as R
1, the distance of the centre-to-centre spacing x-ray source 2 of detected body 7 is designated as R
0, the distance of detector array 4 distance X radiographic sources 2 is designated as R
2, the width of detector array 4 is designated as D.Figure 11 (a) to Figure 11 (d) be the schematic diagram of the dynamic adjustment process of slicing device 1 of the present invention in scanning process.
CT scan method of the present invention comprises the steps: that (1) provides CT scan system 100 as above, described sick bed 3 is along the axial direction turnover test chamber of the test chamber 51 of rotary frame 5, two sections 111 of the section assembly 11 of described slicing device 1, 110 start anteposition in initial position in scanning, two sections 111 of described section assembly 11, spacing between 110 is zero when two sections are positioned at initial position, described two sections 111, 110 joint place plane (f) overlaps with the central plane (e) of detector array during in initial position in two sections of section assembly, (2) determine that sick bed 3 axial direction along the test chamber 51 of rotary frame 5 in scanning process enters the pace V of test chamber, (3) drive two actuating devices 121,120 of slicing device 1 make two sections 111,110 along and sick bed 3 direction that enters the opposite direction of test chamber 51 is moved until the joint place planes (f) of two sections to the distance of the central plane (e) of detector array reaches the first distance L
1time stop driving two actuating devices 121,120 of slicing device 1, (4) drive sick bed 3 to make sick bed with the pace V of sick bed, enter test chamber 51 along the axial direction of the test chamber 51 of rotary frame 5, (5) in leading edge place plane to the distance of the central plane (e) of detector array of imaging region that is positioned at the position to be scanned of the detected body 7 on sick bed 3, reach second distance L
2time drive the direction that section 111 that an actuating device 121 in two actuating devices 121,120 of slicing device 1 makes to be connected with this actuating device 121 enters test chamber 51 along sick bed 3 move and increase the interval between two sections so that the X ray that x-ray source produces is through the interval between two sections and then irradiate the position to be scanned of detected body, (6) interval between two sections reaches the 3rd distance L
3time stop driving this actuating device 121, (7) in back edge place plane to the distance of the central plane (e) of detector array of imaging region that is positioned at the position to be scanned of the detected body 7 on sick bed 3, reach the 4th distance L
4time drive the direction that section 110 that another actuating device 120 in two actuating devices 121,120 of slicing device 1 makes to be connected with this actuating device enters test chamber along sick bed move and dwindle the interval between two sections, (8) between two sections be spaced apart zero time stop driving this actuating device 120, (9) when checking end, stop driving sick bed.
Wherein, step (1) to step (4) is the preparatory stage; Step (5) is to step (6) for starting sweep phase, and ginseng Figure 11 (a) is to shown in Figure 11 (b); Step (6) step (7) is the normal scan stage, and ginseng Figure 11 (b) is to shown in Figure 11 (c); Step (7) to step (8) is the end of scan stage, and ginseng Figure 11 (c) is to shown in Figure 11 (d); Step (8) to step (9) is inspection ending phase.The actuating device that described two actuating devices first drive in scanning process is the first actuating device 121, and an actuating device of rear drive is the second actuating device 120, and the section being connected with the first actuating device is the first section 111; The section being connected with the second actuating device is the second section 110.The movement velocity V of described the first section
1by following formula, obtain: V
1=R
1* V/R
0, wherein, R
1for the distance between x-ray source and the section of section assembly, R
0for the distance between x-ray source and scanning center, the pace that V is sick bed.The movement velocity V of described the second section
2by following formula, obtain: V
2=R
1* V/R
0, wherein, R
1for the distance between x-ray source 2 and the section of section assembly 11, R
0for the distance between x-ray source 2 and scanning center, the pace that V is sick bed.
Described the first distance L
1by following formula, obtain: L
1=R
1* D/ (2*R
2), wherein, R
1for the distance between x-ray source 2 and the section of section assembly 11, D is the width of detector array 4, R
2for the distance between x-ray source 2 and detector array 4.Described second distance L
2by following formula, obtain: L
2=R
0* D/ (2*R
2), wherein, R
0for the distance between x-ray source and scanning center, the width that D is detector array, R
2for the distance between x-ray source and detector array.Described the 3rd distance L
3by following formula, obtain: L
3=R
1* D/R
2, wherein, R
1for the distance between x-ray source and the section of section assembly, the width that D is detector array, R
2for the distance between x-ray source and detector array.Described the 4th distance L
4by following formula, obtain: L
4=R
0* D/ (2*R
2), wherein, R
0for the distance between x-ray source and scanning center, the width that D is detector array, R
2for the distance between x-ray source and detector array.
Adopt in the process that CT scan method of the present invention scans detected body the fan-beam thickness of X-ray beam that limits the opening 112 of transmission section assembly 11 by controlling the motion of section assembly 11 of the slicing device 1 of CT scan system 100 to eliminate prescan and the overscanning process in existing CT scan process, reduced the radiation dose that detected body receives, simple in structure, and easy to operate.
Protection content of the present invention is not limited to above embodiment.Do not deviating under the spirit and scope of inventive concept, variation and advantage that those skilled in the art can expect are all included in the present invention, and take appending claims as protection domain.
Claims (33)
1. a CT machine slicing device, comprise two bracing or strutting arrangements that are oppositely arranged and be set up between two bracing or strutting arrangements and there is the section assembly of two sections, described section assembly has the opening being formed by the interval between two sections, it is characterized in that, on described two bracing or strutting arrangements, be respectively provided with an actuating device, described each actuating device comprises the nut seat that is mounted on the ball-screw on corresponding bracing or strutting arrangement and is mounted on ball-screw and is connected with one end of the respective slice of section assembly, described ball-screw is provided with screw thread, described nut seat is provided with screwed hole, the threaded engagement of described screwed hole and described ball-screw also makes nut seat along ball-screw, make the size of the opening between two sections of axially-movable and then adjustment section assembly when ball-screw rotates.
2. CT machine slicing device as claimed in claim 1, is characterized in that: on the nut seat of described two actuating devices, each group is provided with a connector, and the nut seat of described actuating device is being connected of respective slice with section assembly by connector.
3. CT machine slicing device as claimed in claim 2, it is characterized in that: the nut seat of described actuating device comprises and is mounted on the screw on ball-screw and is mounted on the contiguous block on screw, described screwed hole is located on described screw, described connector is mounted on the contiguous block of nut seat, and described contiguous block is connected with one end of the respective slice of described section assembly by connector.
4. CT machine slicing device as claimed in claim 3, it is characterized in that: described connector comprises the first fixed part and the second fixed part being connected with the first fixed part, described the first fixed part is fixedly connected with the contiguous block of the nut seat of actuating device, and described the second fixed part is connected with one end of the respective slice of section assembly.
5. CT machine slicing device as claimed in claim 4, is characterized in that: the first fixed part of described connector is vertical tabular setting, and described the second fixed part is arranged by the rear horizontal-extending of the first fixed part bending.
6. CT machine slicing device as claimed in claim 5, is characterized in that: the L-shaped setting of described connector.
7. CT machine slicing device as claimed in claim 4, it is characterized in that: described two bracing or strutting arrangements are the first bracing or strutting arrangement and the second bracing or strutting arrangement, two sections of described section assembly include the first end being fixed on the first bracing or strutting arrangement, the arcuation pars intermedia that is fixed to the second end on the second bracing or strutting arrangement and connects first end and the second end.
8. CT machine slicing device as claimed in claim 7, it is characterized in that: two sections of described section assembly are the first section and the second section, described two actuating devices are be mounted on the first actuating device on the first bracing or strutting arrangement and be mounted on the second actuating device on the second bracing or strutting arrangement, connector on the described nut seat that is mounted on the first actuating device is the first connector, connector on the described nut seat that is mounted on the second actuating device is the second connector, the nut seat of described the first actuating device is fixedly connected with the first end of the first section by the first connector, the nut seat of described the second actuating device is fixedly connected with the second end of the second section by the second connector.
9. CT machine slicing device as claimed in claim 8, it is characterized in that: described the first bracing or strutting arrangement is provided with the first guide rail, described the second bracing or strutting arrangement is provided with second guide rail corresponding with the first guide rail of the first bracing or strutting arrangement, the first end of two sections of described section assembly is all fixedly mounted on the first guide rail of the first bracing or strutting arrangement, and the second end of two sections of described section assembly is all fixedly mounted on the second guide rail of the second bracing or strutting arrangement.
10. CT machine slicing device as claimed in claim 9, it is characterized in that: the first guide rail of described the first bracing or strutting arrangement is provided with can be along the first slider guide and second slider guide of its slip, the first end of the first section of described section assembly is fixedly connected with the first slider guide, and the first end of the second section of described section assembly is fixedly connected with the second slider guide.
11. CT machine slicing devices as claimed in claim 10, it is characterized in that: the second guide rail of described the second bracing or strutting arrangement is provided with can be along the 3rd slider guide and the 4th slider guide of its slip, the second end of the first section of described section assembly is fixedly connected with the 3rd slider guide, and the second end of the second section of described section assembly is fixedly connected with the 4th slider guide.
12. CT machine slicing devices as claimed in claim 11, it is characterized in that: the first fixed part of described the first connector is fixedly mounted on the contiguous block of nut seat of the first actuating device, and the second fixed part of described the first connector is fixedly connected with the first slider guide of the first guide rail.
13. CT machine slicing devices as claimed in claim 12, it is characterized in that: the first fixed part of described the second connector is fixedly mounted on the contiguous block of nut seat of the second actuating device, and the second fixed part of described the second connector is fixedly connected with the 4th slider guide of the second guide rail.
14. CT machine slicing devices as described in any one in claim 4 to 13, it is characterized in that: on described two bracing or strutting arrangements, be equipped with first supporting seat and second supporting seat relative with the first supporting seat, the ball-screw of described actuating device is set up between first supporting seat and the second supporting seat of respective support device.
15. CT machine slicing devices as claimed in claim 14, it is characterized in that: described the first supporting seat is provided with accepting hole, described the second supporting seat is provided with second accepting hole corresponding with the first accepting hole, the ball-screw of described actuating device has the first axle part coordinating with the first accepting hole of the first supporting seat and the second axle part coordinating with the second accepting hole of the second supporting seat, and described screw thread is between the first axle part and the second axle part.
16. CT machine slicing devices as claimed in claim 15, is characterized in that: described CT machine also comprises the driving device of ball-screw rotation of drive transmission and the shaft coupling of the ball-screw of connecting drive device and actuating device with slicing device.
17. CT machine slicing devices as claimed in claim 16, is characterized in that: the first axle part of described ball-screw axially stretches out and is provided with the 3rd axial region being connected with driving device.
18. CT machine slicing devices as claimed in claim 17, is characterized in that: the gripper shoe that is also provided with support drive device on described bracing or strutting arrangement.
19. CT machine slicing devices as described in any one in claim 4 to 13, it is characterized in that: described CT machine also comprises reset prompting apparatus with slicing device, described reset prompting apparatus comprises the photoelectricity contact on the nut seat that is fixed on the photoswitch on bracing or strutting arrangement and is fixed on actuating device.
20. CT machine slicing devices as claimed in claim 19, tool is characterised in that: the photoelectricity contact of described reset prompting apparatus is fixedly mounted on the contiguous block of screw of nut seat of actuating device.
21. 1 kinds of CT scan systems, the rotary frame that comprises the test chamber with the detected body turnover of a confession, for carrying the sick bed of detected body, be mounted on the x-ray source on rotary frame, the detector array and the computer system that are mounted on rotary frame and are oppositely arranged with x-ray source, it is characterized in that: described CT scan system also comprises the slicing device as described in any one in claim 1 to 20, described slicing device is mounted on rotary frame and between x-ray source and the test chamber of rotary frame, the size of the opening that described CT scan system is formed by the interval between two sections of the assembly of cutting into slices by adjustment slicing device in scanning process is adjusted the fan-beam thickness through the X-ray beam of opening.
22. CT scan systems as claimed in claim 21, is characterized in that: described computer system comprises CPU, be connected with CPU and for control relative motion between the section of slicing device section control unit, be connected with CPU and for controlling the sick bed control unit of bed motion, from the data acquisition unit of detector array acquired signal, carry out the image reconstruction unit of image reconstruction and show the image-display units of rebuilding image according to the signal of data acquisition unit collection.
23. CT scan systems as claimed in claim 22, is characterized in that: described section control unit comprises the second section control unit of the first section control unit of motion of a section controlling section assembly and the motion of another section of control section assembly.
24. 1 kinds of CT scan methods, is characterized in that, comprise the steps:
CT scan as described in any one in claim 21 to 23 system is provided, described sick bed is along the axial direction turnover test chamber of the test chamber of rotary frame, two sections of the section assembly of described slicing device start anteposition in initial position in scanning, spacing between two sections of described section assembly is zero when two sections are positioned at initial position, and the joint place plane of described two sections overlaps with the central plane of detector array during in initial position in two sections of section assembly;
Determine that sick bed enters the pace of test chamber in scanning process along the axial direction of the test chamber of rotary frame;
Drive two actuating devices of slicing device make two sections along and the sick bed direction that enters the opposite direction of test chamber move until the joint place planes of two sections to the distance of the central plane of detector array reach first apart from time stop driving two actuating devices of slicing device;
Drive sick bed to make sick bed with the pace of sick bed, enter test chamber along the axial direction of the test chamber of rotary frame;
In the leading edge place plane of the imaging region at the position to be scanned of the detected body on sick bed, when reaching second distance, the distance of the central plane of detector array drive the direction that section that an actuating device in two actuating devices of slicing device makes to be connected with this actuating device enters test chamber along sick bed move and increase the interval between two sections, so that the X ray that x-ray source produces is through the interval between two sections and then irradiate the position to be scanned of detected body;
Interval between two sections reach the 3rd apart from time stop driving this actuating device;
The back edge place plane of the imaging region at the position to be scanned of the detected body on sick bed to the distance of the central plane of detector array reach the 4th apart from time drive the direction that section that another actuating device in two actuating devices of slicing device makes to be connected with this actuating device enters test chamber along sick bed move and dwindle the interval between two sections;
Between two sections be spaced apart zero time stop driving this actuating device;
When checking end, stop driving sick bed.
25. CT scan methods as claimed in claim 24, it is characterized in that, the actuating device that described two actuating devices first drive in scanning process is the first actuating device, and an actuating device of rear drive is the second actuating device, and the section being connected with the first actuating device is the first section; The section being connected with the second actuating device is the second section.
26. CT scan methods as claimed in claim 25, is characterized in that, described the first distance L
1by following formula, obtain: L
1=R
1* D/ (2*R
2), wherein, R
1for the distance between x-ray source and the section of section assembly, the width that D is detector array, R
2for the distance between x-ray source and detector array.
27. CT scan methods as claimed in claim 26, is characterized in that, described second distance L
2by following formula, obtain: L
2=R
0* D/ (2*R
2), wherein, R
0for the distance between x-ray source and scanning center, the width that D is detector array, R
2for the distance between x-ray source and detector array.
28. CT scan methods as claimed in claim 27, is characterized in that, described the 3rd distance L
3by following formula, obtain: L
3=R
1* D/R
2, wherein, R
1for the distance between x-ray source and the section of section assembly, the width that D is detector array, R
2for the distance between x-ray source and detector array.
29. CT scan methods as claimed in claim 28, is characterized in that, described the 4th distance L
4by following formula, obtain: L
4=R
0* D/ (2*R
2), wherein, R
0for the distance between x-ray source and scanning center, the width that D is detector array, R
2for the distance between x-ray source and detector array.
30. CT scan methods as claimed in claim 29, is characterized in that, the pace that described the first section enters movement velocity that the direction of test chamber moves and sick bed along sick bed is proportional.
31. CT scan methods as claimed in claim 30, is characterized in that, the movement velocity V of described the first section
1by following formula, obtain: V
1=R
1* V/R
0, wherein, R
1for the distance between x-ray source and the section of section assembly, R
0for the distance between x-ray source and scanning center, the pace that V is sick bed.
32. CT scan methods as claimed in claim 29, is characterized in that, the pace that described the second section enters movement velocity that the direction of test chamber moves and sick bed along sick bed is proportional.
33. CT scan methods as claimed in claim 32, is characterized in that, the movement velocity V of described the second section
2by following formula, obtain: V
2=R
1* V/R
0, wherein, R
1for the distance between x-ray source and the section of section assembly, R
0for the distance between x-ray source and scanning center, the pace that V is sick bed.
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