JPH08215189A - X-ray ct device and its image reconstruction method - Google Patents

Abstract

PURPOSE: To provide the X-ray CT device which stores a plurality of collecting conditions and a plurality of reconstruction conditions in advance, and can selectively make switch-over to an optimum collection condition or an optimum reconstrction condition every area of a photographing object while a series of helical scanning is being performed. CONSTITUTION: The device is equipped with an inputting means 3 inputting a collecting condition or a reconstruction condition in response to the position of a bed top board 9-1 on which a testee is rested, a memory means 6-1 storing the collecting conditions or the reconstruction conditions, a measuring means 9-2 measuring the position of the bed top board while information on the testee is being collected, and with a condition control section 5 or 6 which reads out the collecting condition or the reconstruction condition in response to the measured position of the bed top board out of the memory means 6-1, and thereby makes switch-over thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray CT apparatus for irradiating a subject with X-ray beams from multiple directions and reconstructing an image based on the collected projection data, and an image reconstruction method therefor.

[0002]

2. Description of the Related Art In a conventional X-ray CT apparatus capable of real-time reconstruction, only a single acquisition condition and a single reconstruction condition can be set for a series of helical scans.
Therefore, the acquisition conditions and reconstruction conditions set before imaging do not change until the end of a series of helical scans, and a single acquisition condition is applied from the beginning to the end of a series of helical scans. The collected information was reconstructed and displayed in real time under one reconstruction condition.

However, the X-ray transmittance and the necessary image range may vary depending on the portion of the subject to be examined in more detail (hereinafter referred to as the region of interest) or the symptom of the diagnosis object, so that it is optimal. The collection condition and the reconstruction condition may be different for each part to be imaged. In this case, in the conventional X-ray CT apparatus, the X
The collection conditions such as the X-ray tube voltage, the X-ray tube current, and the slice thickness are set, and the data collection of the object by the helical scan is repeated.

When it is desired to create an image by changing the reconstruction condition for each region of interest after data collection, as shown in FIG. 7, the collected data is read again, the reconstruction condition is set, the image reconstruction and the image display are performed. I had to repeat that routine. In particular, if the center axis of the subject and the center axis of the information collection area are misaligned, it is necessary to frequently reset reconstruction conditions such as the reconstruction center position and magnification ratio to perform image reconstruction. was there.

[0005]

Therefore, the conventional X-ray C is used.
In the T-apparatus, when the portion to be cut out as a tomographic image is large or the amount of data is large, the operation of the X-ray CT apparatus is repeated, the patient's restraint time becomes long, and the operator's labor and time are required. There was a problem that the burden was heavy.

In view of the above-mentioned problems, an object of the present invention is to store in advance optimum acquisition conditions and reconstruction conditions for each part to be imaged, and to make a part to be imaged during a series of helical scans. To provide an X-ray CT device that can dynamically switch the acquisition condition and reconstruction condition according to the patient, shorten the patient restraint time, and reduce the labor and time of the operator to reduce the work load. Is.

Another object of the present invention is to provide an X-ray CT capable of dynamically switching acquisition conditions and reconstruction conditions according to an operator's instruction during a series of helical scans.
The object is to provide a device to shorten a patient's restraint time, reduce labor and time of an operator, and reduce a work load.

[0008]

In order to achieve the above object, the present invention has the following constitution. That is, the invention according to claim 1 collects the information of the subject placed on the bed according to given collection conditions, and the collected information in real time according to given reconstruction conditions. In an X-ray CT apparatus having a reconstructing device configured to obtain a desired image, one of a plurality of acquisition conditions and reconstructing conditions corresponding to the position of the bed on which the subject is placed. Or input means for inputting both conditions, storage means for storing the conditions, measuring means for measuring the position of the bed during information collection of the subject, and the storage means according to the measured position. And a condition control unit for controlling the collecting device and / or the reconstructing device according to the read condition, and the collecting condition and / or the collecting condition during the series of information collection. Reconstruction Condition is an X-ray CT apparatus according to dynamically switch that features corresponding to the bed position.

According to a second aspect of the present invention, a collecting device that collects information on an object placed on a bed according to given collection conditions, and the collected information in real time according to given reconstruction conditions. In an X-ray CT apparatus including a reconstructing apparatus for reconstructing a desired image, a storage unit that stores one or both of a plurality of acquisition conditions and a plurality of reconstruction conditions in advance, and an object to be examined. Input means capable of inputting one or both of a collection condition and a reconstruction condition during information collection of the information, and storing the collection condition and / or the reconstruction condition based on the input specification. And a condition control section for controlling the collecting device and / or the reconstructing device according to the read collecting condition and / or the reconstructing condition, which are read out from the means, and to a designation inputted during a series of information collection. Dynamically switch that the collection conditions and or reconstruction conditions What is an X-ray CT apparatus according to claim.

According to a third aspect of the present invention, in the first or second aspect of the invention, the acquisition conditions are the tube current of the X-ray tube, the tube voltage of the X-ray tube, the slice thickness, the focus size, and the observation. The X-ray CT apparatus is characterized by including an arbitrary combination of conditions selected from the region and the bed speed.

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the reconstruction condition is a reconstruction function, an image filter, a reconstruction center position, an enlargement ratio, a helical interpolation reconstruction type. , An X-ray CT apparatus including any combination of conditions selected from the window level and the window width.

According to a fifth aspect of the present invention, a collecting device that collects the information of the subject placed on the bed according to given collection conditions, and the collected information is reconstructed according to given reconstruction conditions. In the image reconstruction method of the X-ray CT apparatus including the reconstruction device that obtains a desired image, a storage step of storing a plurality of acquisition conditions and a plurality of reconstruction conditions in the storage unit in advance corresponding to the bed position. A collection start step of starting information collection of the subject, a position measurement step of measuring the position of the bed during the information collection of the subject, and a collection condition and a reconstruction condition corresponding to the measured position. The method further comprises a reading step of reading from the storage means, a condition control step of controlling the collecting apparatus and the reconstructing apparatus according to the read collecting condition and reconstructing condition, and a step of repeating the steps following the position measuring step. thing An image reconstruction method of the X-ray CT apparatus characterized.

According to a sixth aspect of the invention, in the fifth aspect of the invention, the acquisition conditions are the tube current of the X-ray tube, X
It is an image reconstruction method for an X-ray CT apparatus characterized by including an arbitrary combination of conditions selected from a tube voltage of a X-ray tube, a slice thickness, a focus size, an observation region and a bed speed.

According to a seventh aspect of the invention, in the fifth aspect of the invention, the reconstruction conditions include a reconstruction function, an image filter, a reconstruction center position, an enlargement ratio, a helical interpolation reconstruction type, a window level, and X characterized by including any combination of conditions selected from within the window width
This is an image reconstruction method for a line CT apparatus.

[0015]

With the above structure, the invention according to claim 1 collects information according to the position of the bed between the time when the object is placed on the bed and the time when the information of the object is collected by the X-ray CT apparatus. The conditions and reconstruction conditions are input from the input means and stored in the storage means. When the collection of information on the subject is started, the position of the bed is measured by the measuring means. The condition control unit reads out the collection condition and the reconstruction condition from the storage unit according to the measured bed position, and switches to the read collection condition and the reconstruction condition. As a result, during a series of information collection, the optimal collection conditions are dynamically switched for each part of the imaging target, and the collected information is dynamically switched to the optimum reconstruction condition for each part in real time. An X-ray CT apparatus for reconstruction is realized.

According to the second aspect of the invention, a plurality of collection conditions and a plurality of reconstruction conditions are stored in the storage means in advance. Then, while the information of the subject is being collected, the designation of the collection condition and the reconstruction condition can be inputted from the input means at any time. The condition control unit reads out the collection condition and the reconstruction condition from the storage unit based on the input designation, and switches the collection condition and the reconstruction condition. As a result, during a series of information collection, the optimal collection conditions are dynamically switched for each part of the imaging target, and the collected information is dynamically switched to the optimum reconstruction condition for each part in real time. X-ray CT to be reconstructed
The device is realized.

According to a third aspect of the present invention, in any of the above X-ray CT apparatuses, as the acquisition conditions, the tube current of the X-ray tube, the tube voltage of the X-ray tube, the slice thickness, the focus size, the observation area and the bed. It is possible to use any combination of these acquisition conditions for each imaging region, including conditions selected from the speed.

According to a fourth aspect of the present invention, in any one of the above X-ray CT apparatuses, the reconstruction condition, the image filter, the reconstruction center position, the enlargement ratio, the helical interpolation reconstruction type, and the window level are used as reconstruction conditions. And a condition selected from the window width, and any combination of these reconstruction conditions can be used for each imaging region.

According to the fifth aspect of the invention, a plurality of collection conditions and a plurality of reconstruction conditions are stored in advance. Then, the information collection of the subject is started according to the initial collection condition and the initial reconstruction condition, and the position of the bed is measured in parallel with the information collection of the subject. Then, the collection conditions and reconstruction conditions stored according to the measured bed position are read out, and the collection conditions and reconstruction conditions that have been read out are switched to obtain the optimum collection for each site of the information collection target of the subject. X-ray CT that can be dynamically switched to conditions and reconstruction conditions
An image reconstruction method of the device is realized.

According to a sixth aspect of the present invention, in the above reconstruction method of the X-ray CT apparatus, as the acquisition conditions, the tube current of the X-ray tube, the tube voltage of the X-ray tube, the slice thickness, the focus size,
Any combination of these acquisition conditions can be used for each imaging region, including conditions selected from the observation region and the bed speed.

According to a seventh aspect of the present invention, in the reconstruction method of the X-ray CT apparatus, the reconstruction condition, the image filter, the reconstruction center position, the enlargement ratio, the helical interpolation reconstruction type are used as the reconstruction conditions. , A window level and a window width, and any combination of these reconstruction conditions can be used for each imaging region.

[0022]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a first X-ray CT apparatus according to the present invention.
It is a block diagram which shows the structure of an Example.

In FIG. 1, a host computer 1 for controlling the entire X-ray CT apparatus has a CRT monitor 2 for displaying a scano image, a condition setting screen, a reconstructed image, etc.
The operation panel 3 and the mouse 3-1 are connected. A collection control unit 5, a reconstruction unit 6 and a data memory 7 are connected to the host computer 11 via a bus 4. The acquisition control unit 5 includes a pedestal 8 accommodating an X-ray detector 8-1 having a large number of channels, a table 9-1 on which a subject (not shown) is placed, a bed 9 and a subject 9 which can move in the horizontal direction. An X-ray generator 10 that can rotate the direction of the X-rays that are emitted is connected thereto. Inside the collection control unit 5, a collection condition memory 5-1 for storing collection conditions is provided. Similarly, the reconstruction unit 6
The reconfiguration condition memory 6 that stores the reconfiguration conditions
-1 is provided.

Next, the operation of this embodiment will be described. Although the collection condition and the reconstruction condition are handled in parallel in the embodiment,
It goes without saying that handling either one is within the scope of the present invention.

First, the subject is placed on the bed top, and a scanogram, which is plane projection data of the subject, is photographed. The scanogram may be planar or lateral depending on the diagnostic purpose or region of interest. Shooting a scout image
The X-ray generator 10 and the X-ray detector 8-1 are fixed, and the couch top 9-1 on which the subject is placed is horizontally moved while irradiating the X-ray under a fixed collection condition.

Next, the part setting screen shown in FIG. 2 and FIG.
The condition setting screen shown in is displayed on the CRT monitor 2. Then, the bed top position (Pos.1, Pos.2, ..., Pos.n) is displayed on the scanogram displayed on the body part setting screen, and the collection condition and the reconstruction condition are respectively displayed on the operation panel 3 on the condition setting screen.
Alternatively, use the mouse 3-1 to input.

The details of the input of the bed top position and the input of the collection condition and the reconstruction condition are as follows. First, a pre-setting arrow * 1, which is a dashed arrow, is displayed on the screen for displaying the scanogram in FIG. Next, the pre-setting arrow * 1 is moved to the site where the acquisition condition or reconstruction condition is to be changed, and the acquisition condition and reconstruction condition corresponding to this site are shown in FIG.
Set according to each setting item in the condition setting screen of.

The collection condition set by the screen of FIG. 3 is any of conditions selected from the tube current of the X-ray tube, the tube voltage of the X-ray tube, the slice thickness, the focus size, the observation area and the bed speed. It is a combination. Similarly, the reconstruction condition to be set is an arbitrary combination of conditions selected from the reconstruction function, the image filter, the reconstruction center position, the enlargement ratio, the helical interpolation reconstruction type, the window level and the window width. is there. The screen of FIG. 3 shows a screen for setting the collection condition and the reconstruction condition at the same time. However, when only one of the collection condition and the reconstruction condition is changed, the left half or the right half of the screen of FIG. A setting function may be provided.

Here, [1] of [Setting object 1] in the second row of FIG. 3 corresponds to [1] of [Presetting arrow * 1],
When the [Setting] key at the bottom right of the screen in Fig. 3 is clicked after the numerical value or specification is set for each setting item, the dashed arrow before setting * 1 keeps its position and the solid arrow Pos.
The display changes to 1. When the [Setting] key is clicked, the next pre-setting arrow * 2 is displayed, and each setting item of [Setting target 2] is input in the same manner. Where Pos.
(I) The collection condition and the reconstruction condition set in (i = 1, 2, ..., N) are valid until Pos. (I + 1) at which the next collection condition and the reconstruction condition are set. When the final position setting and condition setting are completed, the [OK] key is clicked to notify the end of the setting. In this way, the acquisition condition and the reconstruction condition corresponding to the part in the scanogram are sequentially input.

When the setting conditions are input, the host computer 1 sends Pos.i (i
, 1, 2, ..., N), and calculates the acquisition controller and the reconfiguration by adding the start couch position and the end couch position to which the condition is applied to the acquisition condition or the reconstruction condition. Send to the device.

The collection control device and the reconstruction device store the collection condition and the reconstruction condition received from the host computer 1 in the collection condition memory 6-1 or the reconstruction condition memory 5-1 respectively.

FIG. 4 shows an example of a memory image of the stored collection conditions and reconstruction conditions. In FIG. 4, x
Setting condition 1 for the first region of interest is stored in n words from address 1 to address x1 + n-1.
And from x1 + n to x1 + 2n-1
The setting condition 2 for the region of the next region of interest is stored. Hereinafter, similarly, the setting condition 3 is stored from the address x1 + 2n, and the final setting conditions are sequentially stored. The data amount of each setting condition is n words.

At the beginning of each setting condition area, the value of the starting couch position and the value of the ending couch position to which the condition is applied are stored. Next, the acquisition conditions such as the X-ray tube current, the X-ray tube voltage, and the slice thickness are stored, and thereafter the reconstruction conditions such as the reconstruction function, the image filter, the reconstruction center position, and the magnification rate are stored.

In the present embodiment, the storage contents of the collection condition memory 6-1 and the reconstruction condition memory 5-1 store all the setting conditions collectively without making a distinction between the collection condition and the reconstruction condition, Although only the necessary condition is referred to in each device, the collecting condition and the reconstruction condition may be distinguished and only the necessary condition may be stored. When only one of the collection condition and the reconfiguration condition is changed, only one of the collection condition memory 6-1 and the reconfiguration condition memory 5-1 may be provided.

The contents stored in FIG. 4 can be regarded as a program for controlling the information collection of the subject based on the bed position. The helical scan described next can also be regarded as the execution stage of this program.

Next, when the operator gives an instruction to start the helical scan, the couch device 9 starts the couch feed while measuring the position of the couch top 9-1 by the couch position detecting means 9-2, and at the same time the initial stage. X-ray generator 1 under acquisition conditions
X-rays whose generation direction rotates from 0 are generated. The X-ray transmitted through the subject is an X-ray detector 8 having a large number of channels.
-1 is detected, and the X-ray detection intensity for each channel is analog / digital converted by the collection control unit 5. Then, for each view obtained by one rotation of the X-ray source, it is sent to the data memory 7 via the bus 4 as collected data. At this time, the bed position information is added to each view and sent.

FIG. 5 shows an image of the collected data stored in the data memory 7. Looking at FIG. 5 in the horizontal direction, the data of each channel are arranged from 1 to m (the number of channels) in the order of the channel numbers of the X-ray detector, and the bed position is added after that. In the vertical direction of FIG. 5, data is arranged in the view direction.

At the same time when the couch feed is started, the collection control unit 5 and the reconstruction unit 6 start monitoring the bus 4, and the couch position of the collected data for each view sent from the collection control unit 5 to the data memory 7 is determined. take in. And
Collection condition memory 5-1 and reconstruction condition memory 6 respectively
The bed position at which the next acquisition condition or reconstruction condition starts from -1 is read, and this read value is compared with the value of the bed position of the collected data for each view. If these comparison results match, it is determined that the bed top position has reached the condition change position, the collection control unit 5 instructs the gantry 8 and the X-ray generator 10 to change the collection condition, and the reconstruction unit The reconstruction condition is changed, and the image reconstructed based on the new reconstruction condition is output to the monitor 2.

Thus, during a series of helical scans,
The X-ray exposure is performed under the acquisition condition corresponding to the bed top position, and the tomographic image is reconstructed in real time from the collected information according to the reconstruction condition corresponding to the bed top position and displayed on the monitor screen.

In the present embodiment, the storage means for storing the collection condition and the reconstruction condition are distributed and arranged in the collection control device and the reconstruction device. The reason is that the collection control device and the reconstruction device are This is because each of them is provided with a bed position comparing means to perform quick condition switching. However, it is obvious that it is within the scope of the present invention to provide the host computer with a storage unit for storing the collection condition and the reconstruction condition and to compare the bed position by the host computer.

Next, a second embodiment of the X-ray CT apparatus according to the present invention will be described. The second embodiment permits the manual operation of the operator during the helical scan which is the information collection of the subject, and its configuration is the same as that of the first embodiment shown in FIG. Detailed description of the elements is omitted.

Next, the operation of this embodiment will be described. First, as in the first embodiment, the subject is placed on the bed top and the scanogram is imaged. The imaged scanogram may be a plan or side view, depending on the diagnostic purpose or region of interest.

Then, the conditions designated by the respective keys of the operation panel 3 for selecting the collection condition and the reconstruction condition shown in FIG. 6A are set. [Condition 1], [Condition 2], and FIG.
Each key of [Condition 3], ... Shows a combination of a set of collection conditions and reconstruction conditions set respectively, and the setting screen is the same as the setting screen of FIG. 3 used in the first embodiment. It can be used. Note that this condition setting does not need to be reset if the previous setting is valid as it is, and it is possible to use the one set when the X-ray CT apparatus was installed.

Then, as shown in FIG. 6B, the start of the helical scan is instructed while displaying the scanogram on the monitor screen. When the helical scan is started,
The couch device 9 starts feeding the couch while measuring the position of the couch top, and at the same time, the X-ray generator 10 generates X-rays having a rotating direction under the initial acquisition conditions. The host computer 1 synthesizes the bed position information sent from the bed apparatus 9 via the collection control unit 5 and the scano image, displays the progress of the helical scan on the monitor screen 2 by superimposing the scano image, and displays the data. The cross-sectional image at the position where the sampling is completed is reconstructed and displayed in real time by the reconstruction unit 6.

The operator of the X-ray CT apparatus is shown in FIG.
When the progress of the helical scan reaches the portion where the acquisition condition or the reconstruction condition should be changed while observing the monitor screen of No. 3, the condition selection key of the operation panel 3 shown in FIG. Instruct to change the condition set in the key. The host computer 1 receives the key input, analyzes the instruction content, instructs the collection control unit 5 to change the collection condition if the collection condition is changed, and reconfigures the reconfiguration unit 6 if the reconfiguration condition is changed. Instruct to change the reconstruction condition.

Based on this instruction, the collection control unit 5
Instructs the gantry 8 and the X-ray generator 10 to change the acquisition condition, the reconstruction unit changes the reconstruction condition, and outputs the image reconstructed based on the new reconstruction condition to the monitor 2. In this way, the acquisition condition or the reconstruction condition during the helical scan is manually changed.

Next, as a third embodiment, an example will be described in which a manual operation by the operator of the second embodiment is permitted during the program operation of the first embodiment. The scan condition of FIG. 2 and the condition setting screen of FIG. 3 are used to input the acquisition condition and the reconstruction condition corresponding to the region in the scanogram, and the host computer 1 starts the start couch position and the end couch in these setting conditions. It is the same as the first embodiment until the position is added and sent to the collection control device and the reconstruction device. Next, if necessary, the contents of keys for designating each condition of the operation panel of FIG. 6A are set, as in the second embodiment. Third
The operation panel of the embodiment is different from that of the second embodiment in that a [start / resume] key for instructing start or restart of the program operation is added.

When the preparation is completed by the above operation, the [start / restart] key for the program operation is then pressed, and the program operation is started as in the first embodiment. At this time, on the monitor screen, the progress of the helical scan is displayed overlaid on the scanograph image as shown in FIG. 6B, and the cross-sectional image at the position where the data collection is finished is reconstructed and displayed in real time. It While monitoring the monitor screen, when the progress of the helical scan reaches the part where the acquisition condition or reconstruction condition should be changed, the operator presses any condition key on the operation panel 3 to set the corresponding key. It is possible to instruct to change to the collection condition and reconstruction condition. Further, if the user wants to return to the initially set program, he can press the [Start / Resume] key to return to the program operation.

[0049]

As described above, according to the present invention, during the series of helical scans for collecting the information of the subject, the optimum collecting condition and reconstruction condition are selectively selected for each part of the imaging target. It is possible to switch, as in the past,
It is not necessary to repeat the operation of the X-ray CT apparatus for each region of interest to collect information, read the collected data for each region of interest, specify reconstruction conditions, and repeat image reconstruction.

As a result, there is an effect that the restraint time of the medical examination examinee or patient who is the subject is shortened, the work amount of the operator of the X-ray CT apparatus is reduced, and the burden is lightened. Further, there is an effect that an image reconstructed under an appropriate reconstruction condition such as a reconstruction center position and an enlargement ratio can be obtained at the same time when the information of the subject is collected.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a first embodiment of an X-ray CT apparatus according to the present invention.

FIG. 2 is an example of a screen for designating an effective part of setting conditions in the first embodiment.

FIG. 3 is an example of a condition setting screen in the first embodiment.

FIG. 4 is a diagram showing a memory image of a condition storage means in the first embodiment.

FIG. 5 is a diagram showing an image in which collected data of X-ray detection signals in the first embodiment is stored in a data memory.

FIG. 6 is a diagram illustrating an operation panel (a) and a monitor screen (b) during information collection in the second embodiment.

FIG. 7 is a diagram illustrating image reconstruction in a conventional X-ray CT apparatus.

[Explanation of symbols]

1 Host Computer 2 CRT 3 Operation Panel 3-1 Mouse 4 Bus 5 Collection Control Unit 5-1 Collection Condition Memory 6 Reconstruction Unit 6-1 Reconfiguration Condition Memory 7 Data Memory 8
Frame 8-1 X-ray detector 9 Bed 9-1 Bed top 9-2 Top position detecting means 10 X-ray generator

Claims (7)

[Claims] 1. A collecting apparatus for collecting information of an object placed on a bed according to given collection conditions, and a desired device by reconstructing the collected information in real time according to given reconstruction conditions. In an X-ray CT apparatus including a reconstructing device for obtaining an image, one or both of the acquisition condition and the reconstructing condition corresponding to the position of the bed on which the subject is placed is input. Input means, storage means for storing the conditions, measuring means for measuring the position of the bed during the information collection of the subject, read the conditions from the storage means corresponding to the measured position, A condition control unit for giving the read condition to the collecting device and / or the reconstructing device to update the collecting condition and / or the reconstructing condition, and collecting the information during a series of information collection. Conditions and also X-ray CT apparatus according to dynamically switch it characterized by the reconstruction conditions corresponding to the bed position. 2. A collecting apparatus for collecting information of a subject placed on a bed according to given collection conditions, and a desired device by reconstructing the collected information in real time according to given reconstruction conditions. In an X-ray CT apparatus equipped with a reconstructing device for obtaining an image, a storage means for preliminarily storing one or both of a plurality of acquisition conditions and a plurality of reconstruction conditions; Input means capable of inputting one or both of the collection condition and the reconstruction condition during the process, and the collection condition and / or the reconstruction condition are read from the storage means based on the input specification, And a condition control unit for updating the collection condition and / or the reconstruction condition by giving the read collection condition and / or reconstruction condition to the collection device and / or the reconstruction device. X-ray CT apparatus characterized by dynamically switching the collection condition and or reconstruction conditions according to the specifications entered during. 3. The acquisition condition according to claim 1, wherein the acquisition condition is selected from tube current of the X-ray tube, tube voltage of the X-ray tube, slice thickness, focus size, observation region, and bed speed. An X-ray CT apparatus including an arbitrary combination of conditions. 4. The reconstruction condition according to claim 1, wherein the reconstruction condition is selected from a reconstruction function, an image filter, a reconstruction center position, an enlargement ratio, a helical interpolation reconstruction type, a window level and a window width. An X-ray CT apparatus including an arbitrary combination of selected conditions. 5. A collection control device for collecting information on a subject placed on a bed according to given collection conditions, and a desired reconstructed information in real time according to given reconstruction conditions. In the image reconstruction method of the X-ray CT apparatus equipped with the reconstruction device for obtaining the image of the above, one or both of a plurality of acquisition conditions and a plurality of reconstruction conditions are previously stored in the storage means corresponding to the bed position. A storage step of storing, a collection start step of starting information collection of the subject, a position measurement step of measuring the position of the bed during information collection of the subject, and the condition corresponding to the measured position. A read step of reading from the storage means, a condition control step of controlling the collecting apparatus and / or the reconstructing apparatus according to the read condition, and a step of repeating the steps following the position measuring step are provided. An image reconstruction method for an X-ray CT apparatus, characterized by: 6. The collection condition according to claim 5, wherein the collection condition is any one selected from a tube current of the X-ray tube, a tube voltage of the X-ray tube, a slice thickness, a focus size, an observation region and a bed speed. An image reconstruction method for an X-ray CT apparatus, characterized in that it includes a combination. 7. The reconstruction condition according to claim 5, wherein the reconstruction condition is a condition selected from a reconstruction function, an image filter, a reconstruction center position, an enlargement ratio, a helical interpolation reconstruction type, a window level and a window width. An image reconstruction method for an X-ray CT apparatus, characterized by including an arbitrary combination.