CN104411080A - Method for obtaining direct-current pulse high voltage applied to grid-control X-ray bulb tube - Google Patents
Method for obtaining direct-current pulse high voltage applied to grid-control X-ray bulb tube Download PDFInfo
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Abstract
The invention relates to a method for obtaining a direct-current pulse high voltage applied to a grid-control X-ray bulb tube. The method comprises the following steps that: starting a pulse high-voltage generator, a grid-control power supply outputs a negative high voltage to a grid electrode, a rotating anode of a bulb tube starts to rotate faster, and the negative voltage of the grid-control power supply is eliminated when the rotating anode is accelerated to a regulated rotating speed; meanwhile or after a pulse type high-voltage generator starts a high voltage, the high voltage reaches a cathode filament and an anode target plate of the bulb tube directly, and because the grid voltage becomes zero in a conduction state, the electron generated by the cathode filament passes through the grid and bombards the anode target plate, and an X ray is generated at a focus; when time reaches the set high-voltage one, the pulse type high-voltage generator stops to output the high voltage and the grid-control power supply outputs a negative voltage loaded to the grid electrode, so that the electron beam is cut off immediately. During the process, no harmful soft ray is generated and thus injuries on the human bodies can be reduced, so that an active effect for patients is realized.
Description
Technical field
The present invention is specifically related to a kind of method that acquisition is applied to the DC pulse high pressure of grid-controlled X-ray bulb, belongs to x-ray imaging method field.
Background technology
X ray product is commercially widely used, and the product for medical treatment comprises digital filming machine, stomach and intestine machine, angiography machine, CT etc.The common feature that diagnosis X ray is these products can be produced.
Obtain X ray and need high pressure generator and bulb.High pressure generator can produce the high direct voltage of more than tens kilovolts, between the negative electrode that this high direct voltage is loaded into X ray bulb and anode, high velocity bombardment anode target surface under the effect of a large amount of electronics now produced by the filament that heats at bulb cathode terminal at electric field, anode target surface will produce X ray.In actual applications, " matter " and " amount " that controls the X ray produced is needed.Direct voltage is higher, X ray the penetrability (" matter of generation ") stronger.The temperature of filament heating is higher, and the cathode electronics of generation is more, and the beam current density (" amount ") of the corresponding X ray produced is larger.The time that high direct voltage loads is longer, and the total amount (" amount ") of the X ray of generation is larger.
In X ray product, the time length controlling high pressure loading has two kinds of methods usually.
As shown in Figure 6, conventional is adopt impulse type high pressure generator at present, self control the time length that it exports high pressure, the time that the width of pulse and corresponding high pressure load, cost is low, easy to use, but due to when high voltage pulse stops, the electric charge that to have caused the electric capacity of load end to be saved bit by bit a large amount of can not pop-off but fade away, and needs the regular hour, can cause like this producing a large amount of soft raies (low pressure ray).And soft ray is harmful to human body very much.
Current another kind of high pressure generator is the generator of continuous high-pressure, grid-control Energy control is adopted to produce impulse type high pressure, but because the generator of continuous high-pressure is expensive, the method is at present only for very high-end equipment, and therefore domestic also do not have such production.
Summary of the invention
Technical problem to be solved by this invention is to provide the method that kind of a kind of acquisition is applied to the DC pulse high pressure of grid-controlled X-ray bulb, to overcome in prior art due to when high voltage pulse stops, the electric charge that to have caused the electric capacity of load end to be saved bit by bit a large amount of can not pop-off and produce the defect that a large amount of soft raies damages human body.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of acquisition is applied to the method for the DC pulse high pressure of grid-controlled X-ray bulb, comprises the following steps:
Step (1): the positive pole high-pressure side of pulsed high-voltage generator is connected with the anode disc in X ray bulb; Grid is provided with between cathode filament in X ray bulb and anode disc; Filament two ends load filament voltage; Grid-control power cathode end is connected with grid, and negative pole high-pressure side and the filament of its anode tap and described pulsed high-voltage generator are connected; Grid-control power supply exports negative voltage;
Step (2): high pressure generator and bulb expose ready, grid-control power-voltage is cancelled, simultaneously or delay starting impulse type high pressure generator and produce high pressure, high voltage direct is received and is reached cathode filament in bulb and anode disc, now grid voltage vanishing is in conducting state, the electronics that cathode filament produces passes rapidly through grid bombardment anode disc, produces X ray at focus place;
Step (3): after the high-voltage time preset arrives, while impulse type high pressure generator stops exporting high pressure, grid-control power supply output negative voltage is loaded on grid, electron beam is ended immediately, thus X ray ends immediately, the residual charge slow releasing of high pressure generator High voltage output load end, cathode filament in bulb and the voltage between anode disc slowly decline, and arrive anode disc in voltage drop process without electron beam; Repeat step (2) and step (3) acquisition train pulse high direct voltage successively according to high-voltage pulse frequency, produce the X ray of sequence.
The invention has the beneficial effects as follows: present invention employs the time length that impulse type high pressure generator controls high pressure loading, reduce product cost, and be loaded on grid owing to have employed grid-control power supply output negative voltage while impulse type high pressure generator stops exporting high pressure, make the step that X ray ends immediately, the shutoff effect that grid-control power supply produces comes into force instantaneously, and electron beam is cut off instantaneously, therefore effectively prevent the generation of soft ray, reduce and human body is damaged, have good effect to patient.
On the basis of technique scheme, the present invention can also do following improvement.
The method of the DC pulse high pressure that the present invention also provides a kind of acquisition to be applied to grid-controlled X-ray bulb, comprises the following steps:
Step (1): the positive pole high-pressure side of pulsed high-voltage generator is connected with the plural anode disc in X ray bulb; Grid is provided with between cathode filament in X ray bulb and anode disc; Cathode filament two ends load filament voltage; Grid-control power supply is two or more, and its cathode terminal is connected with one group of grid respectively, and negative pole high-pressure side and the filament of its anode tap and described pulsed high-voltage generator are connected; The negative voltage that grid-control power supply produces is loaded previously on grid;
Step (2): high pressure generator and bulb expose ready, first grid-control power-voltage is cancelled, simultaneously or delay starting impulse type high pressure generator and produce high pressure, high voltage direct is received and is reached cathode filament corresponding with first grid-control power supply in bulb and anode disc, now first grid voltage is zero be in conducting state, the electronics that cathode filament produces passes rapidly through grid bombardment anode disc, produces X ray at corresponding focus place; Negative voltage in this process on other grid remains unchanged, and the focus corresponding with it does not produce X ray;
Step (3): after the high-voltage time preset arrives, while impulse type high pressure generator stops exporting high pressure, first grid-control power supply output negative voltage is loaded on grid, make electron beam end X ray immediately to end immediately, the residual charge slow releasing of high pressure generator High voltage output load end, between bulb cathode anode, voltage slowly declines, and arrives anode disc in this process without electron beam;
Step (4) second grid-control power-voltages are cancelled, simultaneously or delay starting impulse type high pressure generator and produce high pressure, high voltage direct is received and is reached the bulb cathode filament corresponding with second grid-control power supply and anode disc, now second grid voltage vanishing is in conducting state, the electronics that corresponding cathode filament produces passes rapidly through grid bombardment anode disc, produces X ray at focus place; Negative voltage now on other grid remains unchanged, and the focus corresponding with it does not produce X ray;
Step (5): after the high-voltage time preset arrives, while impulse type high pressure generator stops exporting high pressure, the second grid-control power supply output negative voltage is loaded on grid corresponding thereto, X ray is ended immediately, the residual charge slow releasing of high pressure generator High voltage output load end, between bulb cathode anode, voltage slowly declines, and arrives anode disc in this process without electron beam;
Step (6): the like to the 3rd, the 4th, the 5th ... cancel to the n-th grid-control power-voltage, simultaneously or delay starting impulse type high pressure generator and produce high pressure, high voltage direct is received and is reached the bulb cathode filament corresponding with the n-th grid-control power supply and anode disc, now the n-th grid voltage vanishing is in conducting state, the electronics that corresponding cathode filament produces passes rapidly through grid bombardment anode disc, produces X ray at focus place; Negative voltage now on other grid remains unchanged, and the focus corresponding with it does not produce X ray;
Step (7): after the high-voltage time preset arrives, while impulse type high pressure generator stops exporting high pressure, the n-th grid-control power supply output negative voltage is loaded on grid corresponding thereto, X ray is ended immediately, the residual charge slow releasing of high pressure generator High voltage output load end, between bulb cathode anode, voltage slowly declines, and arrives anode disc in this process without electron beam;
Above-mentioned steps (1) repeats to step (7) according to according to certain frequency, and the high pressure of the sequence that a pulsed high-voltage generator is produced produces the X ray of multiple sequence at multiple focus place.
A kind of acquisition of the present invention is applied to the method for the DC pulse high pressure of grid-controlled X-ray bulb, comprise the following steps: the positive pole high-pressure side of step (1) pulsed high-voltage generator is connected with the anode disc of two in X ray bulb, the cathode filament in X ray bulb and be provided with two groups of grids between two anode discs; Cathode filament two ends load filament voltage; Grid-control power supply is two, and its cathode terminal is connected with one group of grid respectively, and negative pole high-pressure side and the filament of its anode tap and described pulsed high-voltage generator are connected; The negative voltage that each grid-control power supply produces is loaded previously into often to be organized on grid;
Step (2) high pressure generator and bulb expose ready, first grid-control power-voltage is cancelled, simultaneously or delay starting impulse type high pressure generator and produce high pressure, high voltage direct is received and is reached cathode filament corresponding with first grid-control power supply in bulb and anode disc, now first grid voltage is zero be in conducting state, the electronics that cathode filament produces passes rapidly through grid bombardment first anode target disc, produces X ray at corresponding focus place; Negative voltage in this process on second grid remains unchanged, and the focus corresponding with second grid does not produce X ray;
Step (3): after the high-voltage time preset arrives, while impulse type high pressure generator stops exporting high pressure, first grid-control power supply output negative voltage is loaded on grid, make electron beam end X ray immediately to end immediately, the residual charge slow releasing of high pressure generator High voltage output load end, between bulb cathode anode, voltage slowly declines, and arrives anode disc in this process without electron beam;
Step (4) second grid-control power-voltages are cancelled, simultaneously or delay starting impulse type high pressure generator and produce high pressure, high voltage direct is received and is reached the bulb cathode filament corresponding with second grid-control power supply and anode disc, now second grid voltage vanishing is in conducting state, the electronics that corresponding cathode filament produces passes rapidly through grid bombardment anode disc, produces X ray at focus place; Negative voltage now on first grid remains unchanged, and the focus corresponding with it does not produce X ray;
Step (5): after the high-voltage time preset arrives, while impulse type high pressure generator stops exporting high pressure, the second grid-control power supply output negative voltage is loaded on grid corresponding thereto, X ray is ended immediately, the residual charge slow releasing of high pressure generator High voltage output load end, between bulb cathode anode, voltage slowly declines, and arrives anode disc in this process without electron beam;
Above-mentioned steps (1) repeats to step (5) according to according to certain frequency, and the high pressure of the sequence that a pulsed high-voltage generator is produced produces the X ray of two sequences at two focus places.
Said method of the present invention can realize twice or two groups of exposures at adjacent two focus places under the state not moving physical location, thus obtain two or two groups of X ray images, this image can be used for compound stereoscopic 3D image display, to obtain more organizational information.
Increase the number of grid-control power supply and the bulb focus number of grid and correspondence, the same method of operation can realize X-ray exposure and the IMAQ of more points, further view data is rebuild, tomography and 3D rendering information can be obtained, the structural information of more irradiated object can be obtained.
Accompanying drawing explanation
Fig. 1 be a kind of acquisition of the present invention be applied to the DC pulse high pressure of grid-controlled X-ray bulb method implement time use generation X-ray apparatus structural representation.
Fig. 2 is that another kind of the present invention obtains the generation X-ray apparatus structural representation used when the method being applied to the DC pulse high pressure of grid-controlled X-ray bulb is implemented;
Fig. 3 is the method sequential chart that a kind of acquisition of the present invention is applied to the DC pulse high pressure of grid-controlled X-ray bulb;
Fig. 4 is that the present invention's another kind obtains the method sequential chart being applied to the DC pulse high pressure of grid-controlled X-ray bulb;
Fig. 5 is that the present invention's another kind obtains the generation X-ray apparatus structure chart used when the method being applied to the DC pulse high pressure of grid-controlled X-ray bulb is implemented;
Fig. 6 is the schematic diagram of existing generation X ray method.
In accompanying drawing, the list of parts representated by each label is as follows:
1, impulse type high pressure generator, 2, filament both end voltage, 3, bulb, 31, anode disc, 32, cathode filament, 33, grid, 34, x-ray focus, 4, grid-control power supply, the 41, first grid-control power supply, the 42, second grid-control power supply.
Embodiment
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
Embodiment 1
As shown in figures 1 and 3, a kind of acquisition of the present invention is applied to the method for the DC pulse high pressure of grid-controlled X-ray bulb, comprise the following steps: starting impulse high pressure generator, grid-control power supply exports negative high voltage to grid, the rotarting anode of bulb starts to accelerate to rotate, regulation rotating speed is accelerated to Deng rotarting anode, grid-control power-voltage is cancelled, (or delaying) impulse type high pressure generator starts high pressure simultaneously, now high voltage direct is received and is reached bulb cathode filament and anode disc, because grid is in conducting state, the electronics that cathode filament produces passes rapidly through grid bombardment anode disc, X ray is produced at focus place.Arrive when the high-voltage time time of setting, impulse type high pressure generator stops exporting high pressure, and the power supply of grid-control simultaneously exports negative voltage and is loaded on grid, and X ray is ended immediately.The residual charge slow releasing of high pressure generator load end, between bulb cathode anode, voltage slowly declines, but this process is because arriving anode disc without electron beam, can not produce harmful soft ray.
When said method specifically carries out lung radiography, the condition needing the pulsed high-voltage generator adopted is high pressure 100KV, electric current 200mA, time 10ms.
Start exposure ready signal, now grid-control power supply exports negative high voltage-4KV to grid, the rotarting anode of bulb starts to accelerate to rotate, cathode filament voltage is increased to 200mA required voltage, waits rotarting anode to accelerate to regulation rotating speed, starts exposure signal, now impulse type output high voltage of high-voltage generator 100KV, grid negative high voltage-the 4KV of the power supply of grid-control simultaneously becomes 0V instantaneously, and cathode electronics, through grid anode high-speed motion, forms 200mA electric current.The 10ms time arrives, and impulse type high pressure generator stops exporting high pressure, and the power supply of grid-control simultaneously exports-4KV negative voltage and is loaded on bulb grid, and X ray stops immediately, end exposure.Voltage between anode and negative electrode slowly reduces to 0V.
Embodiment 2
As shown in Figure 2 and Figure 4, a kind of acquisition of the present invention is applied to the interior structural representation producing focus of the bulb used in the method for the DC pulse high pressure of grid-controlled X-ray bulb, namely produce a focus and then need one group of grid-control power supply, cathode filament and anode disc, and between cathode filament with anode disc, be provided with the one group of grid being connected grid-control power cathode, two groups be arranged in parallel; Produce the structural representation that two focuses then need two groups of grid-control power supplys, a cathode filament and two anode discs as shown in Figure 5, namely cathode filament is positioned at centre position, both sides are anode disc, are provided with the grid being connected grid-control power cathode between cathode filament with anode disc.A kind of acquisition of the present invention is applied to the method for the DC pulse high pressure of grid-controlled X-ray bulb, as shown in Fig. 2,4,5, the positive pole high-pressure side of pulsed high-voltage generator is connected with the anode disc of two in X ray bulb, the cathode filament in X ray bulb and be provided with two groups of grids between two anode discs; Cathode filament two ends load filament voltage; Grid-control power supply is two, and its cathode terminal is connected with one group of grid respectively, and negative pole high-pressure side and the filament of its anode tap and described pulsed high-voltage generator are connected; Specifically comprise the following steps: the negative voltage that each grid-control power supply of step (1) produces is loaded previously into often to be organized on grid;
Step (2) high pressure generator and bulb expose ready, first grid-control power-voltage is cancelled, simultaneously or delay starting impulse type high pressure generator and produce high pressure, high voltage direct is received and is reached cathode filament corresponding with first grid-control power supply in bulb and anode disc, now first grid voltage is zero be in conducting state, the electronics that cathode filament produces passes rapidly through grid bombardment first anode target disc, produces X ray at corresponding focus place; Negative voltage in this process on second grid remains unchanged, and the focus corresponding with second grid does not produce X ray;
Step (3): after the high-voltage time preset arrives, while impulse type high pressure generator stops exporting high pressure, first grid-control power supply output negative voltage is loaded on grid, make electron beam end X ray immediately to end immediately, the residual charge slow releasing of high pressure generator High voltage output load end, between bulb cathode anode, voltage slowly declines, and arrives anode disc in this process without electron beam;
Step (4) second grid-control power-voltages are cancelled, simultaneously or delay starting impulse type high pressure generator and produce high pressure, high voltage direct is received and is reached the bulb cathode filament corresponding with second grid-control power supply and anode disc, now second grid voltage vanishing is in conducting state, the electronics that corresponding cathode filament produces passes rapidly through grid bombardment anode disc, produces X ray at focus place; Negative voltage now on first grid remains unchanged, and the focus corresponding with it does not produce X ray;
Step (5): after the high-voltage time preset arrives, while impulse type high pressure generator stops exporting high pressure, the second grid-control power supply output negative voltage is loaded on grid corresponding thereto, X ray is ended immediately, the residual charge slow releasing of high pressure generator High voltage output load end, between bulb cathode anode, voltage slowly declines, and arrives anode disc in this process without electron beam;
Above-mentioned steps (1) repeats to step (5) according to according to certain frequency, and the high pressure of the sequence that a pulsed high-voltage generator is produced produces the X ray of two sequences at two focus places.
When said method specifically carries out lung radiography, the condition needing the pulsed high-voltage generator adopted is high pressure 100KV, electric current 200mA, time 10ms.
Under initial condition, the first grid-control power supply and the second grid-control power supply export negative high voltage-4KV simultaneously, and namely two grids are cut off simultaneously.When exposure prepares, two filaments load filament voltage to exposing ready state simultaneously, and this state can ensure that exposure tube electric current is 200mA.
When exposure starts, first grid-control power-high pressure-4KV cancels and namely becomes 0V, (or delaying 10ms) pulsed high-voltage generator starts output high pressure 100KV simultaneously, now high voltage direct is received and is reached bulb negative electrode and anode, due to the gate turn-on corresponding with the first grid-control power supply, the electronics that the corresponding filament of grid produces arrives anode disc through grid at a high speed, in the exposure of corresponding focus place, produces X ray; Continue maintenance-4KV with the corresponding grid voltage of the second grid-control power supply, grid is off state, and corresponding focus can not produce ray.
The high-voltage time 10ms of setting arrives, pulsed high-voltage generator stops exporting high pressure, and the first grid-control power initiation exports negative high voltage-4KV simultaneously, and grid is corresponding thereto disconnected, and make the X ray pop-off at focus place corresponding thereto, this place's end exposure.
Residual charge slow releasing between negative electrode and anode, voltage reduces to 0V gradually.Soft ray can not be produced.
After certain time-delay 50ms terminates, second grid-control power-high pressure-4KV cancels and becomes 0V, (or delaying 10ms) pulsed high-voltage generator starts output high pressure 100KV simultaneously, high voltage direct is received and is reached bulb negative electrode and anode, due to now corresponding with the second grid-control power supply gate turn-on, the focus-exposure that second grid-control position of source is corresponding, produces X ray.Continue maintenance-4KV with the corresponding grid voltage of the first grid-control power supply, grid is off state, and corresponding focus can not produce ray.
The time for exposure 10ms of setting arrives, and pulsed high-voltage generator stops High voltage output, and the second grid-control power initiation exports negative high voltage-4KV simultaneously, and grid is corresponding thereto disconnected, and the X ray at focus place corresponding thereto synchronously disappears, this place's end exposure.
Residual charge slow releasing between negative electrode and anode, voltage reduces to 0V gradually.Repeat above step 20 time according to the frequencies of 5 times per second and can obtain two groups, the X ray image of every Zu Ge20Zhang lung, this image can be used for the display of compound stereoscopic 3D dynamic image, to obtain more organizational information.
Said method can not produce soft ray.And twice of adjacent two focus places or two groups of exposures under the state can not moving physical location at bulb, thus obtaining two or two groups of X ray images, this image can be used for compound stereoscopic 3D image display, to obtain more organizational information.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. acquisition is applied to a method for the DC pulse high pressure of grid-controlled X-ray bulb, it is characterized in that, comprises the following steps:
Step (1): the positive pole high-pressure side of pulsed high-voltage generator is connected with the anode disc in X ray bulb; Grid is provided with between cathode filament in X ray bulb and anode disc; Filament two ends load filament voltage; Grid-control power cathode end is connected with grid, and negative pole high-pressure side and the filament of its anode tap and described pulsed high-voltage generator are connected; Grid-control power supply exports negative voltage;
Step (2): high pressure generator and bulb expose ready, grid-control power-voltage is cancelled, simultaneously or delay starting impulse type high pressure generator and produce high pressure, high voltage direct is received and is reached cathode filament in bulb and anode disc, now grid voltage vanishing is in conducting state, the electronics that cathode filament produces passes rapidly through grid bombardment anode disc, produces X ray at focus place;
Step (3): after the high-voltage time preset arrives, while impulse type high pressure generator stops exporting high pressure, grid-control power supply output negative voltage is loaded on grid, electron beam is ended immediately, thus X ray ends immediately, the residual charge slow releasing of high pressure generator High voltage output load end, cathode filament in bulb and the voltage between anode disc slowly decline, and arrive anode disc in voltage drop process without electron beam; Repeat step (2) and step (3) acquisition train pulse high direct voltage successively according to high-voltage pulse frequency, produce the X ray of sequence.
2. acquisition is applied to a method for the DC pulse high pressure of grid-controlled X-ray bulb, it is characterized in that, comprises the following steps:
Step (1): the positive pole high-pressure side of pulsed high-voltage generator is connected with the plural anode disc in X ray bulb; Grid is provided with between cathode filament in X ray bulb and anode disc; Cathode filament two ends load filament voltage; Grid-control power supply is two or more, and its cathode terminal is connected with one group of grid respectively, and negative pole high-pressure side and the filament of its anode tap and described pulsed high-voltage generator are connected; The negative voltage that grid-control power supply produces is loaded previously on grid;
Step (2): high pressure generator and bulb expose ready, first grid-control power-voltage is cancelled, simultaneously or delay starting impulse type high pressure generator and produce high pressure, high voltage direct is received and is reached cathode filament corresponding with first grid-control power supply in bulb and anode disc, now first grid voltage is zero be in conducting state, the electronics that cathode filament produces passes rapidly through grid bombardment anode disc, produces X ray at corresponding focus place; Negative voltage in this process on other grid remains unchanged, and the focus corresponding with it does not produce X ray;
Step (3): after the high-voltage time preset arrives, while impulse type high pressure generator stops exporting high pressure, first grid-control power supply output negative voltage is loaded on grid, make electron beam end X ray immediately to end immediately, the residual charge slow releasing of high pressure generator High voltage output load end, between bulb cathode anode, voltage slowly declines, and arrives anode disc in this process without electron beam;
Step (4) second grid-control power-voltages are cancelled, simultaneously or delay starting impulse type high pressure generator and produce high pressure, high voltage direct is received and is reached the bulb cathode filament corresponding with second grid-control power supply and anode disc, now second grid voltage vanishing is in conducting state, the electronics that corresponding cathode filament produces passes rapidly through grid bombardment anode disc, produces X ray at focus place; Negative voltage now on other grid remains unchanged, and the focus corresponding with it does not produce X ray;
Step (5): after the high-voltage time preset arrives, while impulse type high pressure generator stops exporting high pressure, the second grid-control power supply output negative voltage is loaded on grid corresponding thereto, X ray is ended immediately, the residual charge slow releasing of high pressure generator High voltage output load end, between bulb cathode anode, voltage slowly declines, and arrives anode disc in this process without electron beam;
Step (6): successively to the n-th grid-control power-voltage is cancelled, simultaneously or delay starting impulse type high pressure generator and produce high pressure, high voltage direct is received and is reached the bulb cathode filament corresponding with the n-th grid-control power supply and anode disc, now the n-th grid voltage vanishing is in conducting state, the electronics that corresponding cathode filament produces passes rapidly through grid bombardment anode disc, produces X ray at focus place; Negative voltage now on other grid remains unchanged, and the focus corresponding with it does not produce X ray;
Step (7): after the high-voltage time preset arrives, while impulse type high pressure generator stops exporting high pressure, the n-th grid-control power supply output negative voltage is loaded on grid corresponding thereto, X ray is ended immediately, the residual charge slow releasing of high pressure generator High voltage output load end, between bulb cathode anode, voltage slowly declines, and arrives anode disc in this process without electron beam;
Above-mentioned steps (1) repeats to step (7) according to according to certain frequency, and the high pressure of the sequence that a pulsed high-voltage generator is produced produces the X ray of multiple sequence at multiple focus place.
3. the method for the DC pulse high pressure of grid-controlled X-ray bulb is applied to according to claim 2 acquisition, it is characterized in that, the positive pole high-pressure side of described step (1) pulsed high-voltage generator is connected with the anode disc of two in X ray bulb, the cathode filament in X ray bulb and be provided with two groups of grids between two anode discs; Cathode filament two ends load filament voltage; Grid-control power supply is two, and its cathode terminal is connected with one group of grid respectively, and negative pole high-pressure side and the filament of its anode tap and described pulsed high-voltage generator are connected; The negative voltage that each grid-control power supply produces is loaded previously into often to be organized on grid;
Step (2) high pressure generator and bulb expose ready, first grid-control power-voltage is cancelled, simultaneously or delay starting impulse type high pressure generator and produce high pressure, high voltage direct is received and is reached cathode filament corresponding with first grid-control power supply in bulb and anode disc, now first grid voltage is zero be in conducting state, the electronics that cathode filament produces passes rapidly through grid bombardment first anode target disc, produces X ray at corresponding focus place; Negative voltage in this process on second grid remains unchanged, and the focus corresponding with second grid does not produce X ray;
Step (3): after the high-voltage time preset arrives, while impulse type high pressure generator stops exporting high pressure, first grid-control power supply output negative voltage is loaded on grid, make electron beam end X ray immediately to end immediately, the residual charge slow releasing of high pressure generator High voltage output load end, between bulb cathode anode, voltage slowly declines, and arrives anode disc in this process without electron beam;
Step (4) second grid-control power-voltages are cancelled, simultaneously or delay starting impulse type high pressure generator and produce high pressure, high voltage direct is received and is reached the bulb cathode filament corresponding with second grid-control power supply and anode disc, now second grid voltage vanishing is in conducting state, the electronics that corresponding cathode filament produces passes rapidly through grid bombardment anode disc, produces X ray at focus place; Negative voltage now on first grid remains unchanged, and the focus corresponding with it does not produce X ray;
Step (5): after the high-voltage time preset arrives, while impulse type high pressure generator stops exporting high pressure, the second grid-control power supply output negative voltage is loaded on grid corresponding thereto, X ray is ended immediately, the residual charge slow releasing of high pressure generator High voltage output load end, between bulb cathode anode, voltage slowly declines, and arrives anode disc in this process without electron beam;
Above-mentioned steps (1) repeats to step (5) according to certain frequency, and the high pressure of the sequence that a pulsed high-voltage generator is produced produces the X ray of two sequences at two focus places.
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| CN107924796A (en) * | 2015-06-30 | 2018-04-17 | 韩国威泰有限公司 | Portable X ray generating means with electric field transmitting X radiographic sources |
| CN108076578A (en) * | 2016-11-15 | 2018-05-25 | 西门子保健有限责任公司 | Method, computer program product and the equipment of X-ray pulse are generated in X-ray imaging |
| CN111669884A (en) * | 2019-03-06 | 2020-09-15 | 北京艾立科技有限公司 | X-ray combined machine head |
| CN112601339A (en) * | 2020-12-09 | 2021-04-02 | 南京航空航天大学 | Modulated pulsed X-ray emission system |
| CN113659841A (en) * | 2021-08-16 | 2021-11-16 | 苏州博思得电气有限公司 | Pulse control circuit, high voltage generator and ray imaging equipment |
| CN113691138A (en) * | 2021-08-16 | 2021-11-23 | 苏州博思得电气有限公司 | Pulse control circuit, high voltage generator and ray imaging equipment |
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