JP5770524B2 - Chemical injection device and imaging system - Google Patents

Description

  The present invention relates to a chemical solution injection device for injecting a contrast medium into a patient and an imaging system including the same, and in particular, a chemical liquid capable of controlling the injection amount of a contrast medium with higher accuracy in consideration of the patient's body shape. The present invention relates to an injection device and an imaging system.

Currently, CT (Computed Tomography) scanner, MRI (Magnetic) are used as medical diagnostic imaging equipment.
Resonance Imaging), PET (Positron Emission Tomography), and DSA (Angiography, Digital
Subtraction Angiography) is known. When such an imaging apparatus is used, a contrast medium, physiological saline, or the like (hereinafter simply referred to as “medical solution”) may be injected into the patient, and various injection heads that automatically perform this chemical injection Proposed.

  Conventionally, for example, the amount of contrast medium injected is determined in consideration of the sex, weight, etc. of the patient. Patent Document 1 proposes determining the amount of contrast medium based on a parameter called lean body mass. “Lean body weight” refers to the weight obtained by subtracting the fat mass from the patient's body weight, and by using this lean body weight as a parameter, it is possible to set more appropriate drug solution injection conditions for the patient. Become.

WO2008 / 081830

  Also in the injection amount determination method based on the body weight and lean body mass as described above, basically, the amount to be injected can be determined satisfactorily. However, in these methods, even if the body weight is the same, if the height difference is significantly different (for example, a 60 cm patient at 180 cm and a 60 kg patient at 150 cm), the CT value is controlled. There was a problem that it was difficult to do accurately.

  The present invention has been made in view of the above problems, and an object thereof is to consider a patient's body shape, and to control a contrast medium injection amount and the like with higher accuracy, and an imaging system including the same Is to provide.

  The present invention obtains an X-ray absorption amount at a predetermined cross section based on a scan plan image (details will be described later) obtained by imaging performed in advance at the time of CT examination, and increases the CT value at the examination site from the result. The appropriate contrast medium injection amount and the like are determined accordingly.

That is, the present invention is as follows.
1. A medical fluid injection device for injecting a contrast medium into a patient,
(A) a process of accepting input of information related to the amount of X-ray absorption in a cross section near the examination site;
(B) Using the X-ray absorption amount as one parameter, a process of determining the amount of contrast agent component to be injected into the patient;
A chemical injection device including a control unit.

The “examination part” means a part (for example, heart, liver, kidney, etc.) imaged by the imaging device, and this part is changed depending on which part of the patient is imaged.
“Process for accepting input of information” may be input by transmitting information from another device to the chemical injection device, or may be input manually by an operator. Good.
“Amount of contrast agent component” refers to the amount of the contrast agent component (iodine as an example), and this amount is altered, for example, by changing the volume or concentration of contrast agent to be injected.
“Determine (amount of contrast agent component)” is not intended to ultimately determine the injection conditions.

2. In the process (a),
(A1) processing for acquiring scan plan image data imaged by the imaging device;
(A2) A process of calculating a cumulative value of the pixel density of the scan plan image, and a process of calculating a cumulative value of the pixel density in the body width direction of the patient near the examination site,
In the process (b),
(B1) The drug solution injection device according to 1 above, wherein an amount of a contrast agent component to be injected into a patient is determined using the calculated cumulative value as one parameter.

The “scanning plan image” refers to a fluoroscopic image obtained by imaging for positioning a patient, and is also called a scanography, a scanogram, or a scanogram. In this imaging, a fluoroscopic image of a patient can be obtained by moving the bed without rotating the X-ray tube and the detector and performing imaging in synchronization with the movement.

  As another form of the present invention, in the process (a), as the “information about the X-ray absorption amount”, the data about the cumulative value of the pixel concentration calculated by the imaging device based on the scan plan image The structure input into an apparatus may be sufficient.

3. In the process (b1),
Preliminarily prepared data indicating the correlation between the cumulative value of the pixel density and the CT value;
The calculated cumulative value, and
3. The liquid medicine injection device according to 2 above, wherein the amount of a contrast medium component to be injected into a patient is determined using The “data indicating the correlation” does not particularly limit the format of the data. For example, the format may be a graph (standard curve) or a data table. .

4). 3. The chemical injection device according to 2 above, wherein the process (a2) is performed by software image processing.

5. A medical fluid injection device for injecting a contrast medium into a patient,
(C) a process of acquiring body data or imaging data corresponding to an X-ray absorption amount in a cross section near the examination site;
(D) using the acquired data as one parameter, a process of determining the amount of contrast agent component to be injected into the patient;
A chemical injection device including a control unit.

The “corresponding to the X-ray absorption amount (body data or imaging data)” is not the X-ray absorption amount itself but means data correlated with the X-ray absorption amount. “Body data” refers to data relating to the patient's body, and “imaging data” refers to data relating to imaging conditions.

6). In the process (c),
Patient width or circumference data is acquired,
In the process (d),
With the body width or circumference data as one parameter, the amount of contrast agent component to be injected into the patient is determined.
6. The chemical injection device according to 5 above.

7). In the process (c),
Data of the maximum effective field of view (FOV: Field of View) indicating the imaging range is acquired,
In the process (d),
Using the acquired FOV size data as one parameter, the amount of contrast agent component to be injected into the patient is determined.
6. The chemical injection device according to 5 above.

8). An injection head that holds the syringe and injects the liquid medicine in the syringe toward the patient;
A controller device connected to the injection head;
With
The chemical injection device according to any one of 1 to 7, wherein the controller is provided with the controller.

In this specification, for example, a chemical liquid injector is
(A) a process of accepting input of information related to the amount of X-ray absorption in a cross section near the examination site;
(B) Using the X-ray absorption amount as one parameter, a process for determining the amount of contrast agent component to be injected into the patient.
In such a case, these processes are performed by hardware (not shown) incorporated in the chemical liquid injector (in the above example, (a) X-ray absorption amount input unit, (b) component amount determination unit). To be implemented. The same applies to other processes.

  ADVANTAGE OF THE INVENTION According to this invention, the chemical | medical solution injection device which can control the injection quantity etc. of a contrast agent with higher precision according to a patient's body shape, and an imaging system provided with the same can be provided.

It is a perspective view which shows the whole system. It is a perspective view of an injection | pouring head and the chemical | medical solution syringe with which it is mounted | worn. FIG. 2 is a block diagram of the system of FIG. 1. FIG. 4A is a scan plan image obtained by imaging a phantom produced assuming a subject, and FIG. 4B is a graph showing the accumulated pixel density of the scan plan image in the horizontal direction. FIG. 4C is a diagram schematically showing a cross-sectional image at the position (i) and a cross-sectional image at the position (iii) of the conical phantom. 3 is a standard curve schematically showing a correlation between a cumulative value of pixel density and a contrast CT value. It is a scan plan image when the subject is small, and a histogram of cumulative values of pixel densities. It is a scan plan image when the subject is large, and a histogram of cumulative values of the pixel density. 6 is a standard curve schematically showing the correlation between the accumulated value of pixel density and the contrast CT value, and shows the case of the subject in FIG. 6 and the case of the subject in FIG. It is a figure for demonstrating an example of the method of determining the amount of contrast agents which should be inject | poured using a standard curve.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the imaging system 1 includes an imaging device 300 that captures a fluoroscopic image of a patient, and a chemical solution injection device that is interconnected to the imaging device 300 and injects a contrast medium or the like into the patient. 100.

  The imaging apparatus 300 is a known X-ray CT scanner as an example, and includes a scanner main body 301 that executes an imaging operation, and a control unit 302 that controls the operation of the scanner main body 301. In the block diagram of FIG. 3, as the imaging apparatus 300, a control unit 302, an imaging unit 301 a and a bed 304 that are controlled by the control unit 302 are illustrated. Although not shown, the imaging unit 301a is a part corresponding to an X-ray tube and a detector built in the scanner body 301.

  The imaging apparatus 300 also has a function of performing a scan at a predetermined timing in synchronization with the injection of the contrast medium from the drug solution injection apparatus 100, a function of performing so-called scano imaging on the patient before the main scan, and the like. Yes. Scano imaging refers to imaging for positioning the patient, and moves the bed 304 without rotating the X-ray tube and detector, and obtains a fluoroscopic image by performing imaging in synchronization with the movement. is there. The image obtained here is, for example, as shown in FIG. 6A, and is hereinafter referred to as a “scanning plan image”.

  In FIG. 1, the scanner main body 301 and the control unit 302 are shown to be disposed in the same room. However, actually, the control unit 302 is located in a separate room from the scanner main body 301 and the chemical solution injector 100. Has been placed.

  The chemical solution injection device 100 includes an injection head 110 held on a caster stand, and a controller device 50 connected to the head 110 via a cable 102 (for example). As shown in FIG. 2, the injection head 110 has syringe holding portions 114 and 114 that hold two syringes A and B, respectively. One of the syringes A and B is filled with a contrast medium, and the other is filled with physiological saline. As an example, the syringes A and B are obtained by inserting a piston member 212 into a cylindrical cylinder member 211 so as to be slidable. Although not limited, in the example of FIG. 2, the syringes A and B are attached to the head via the adapter 160 (only the adapter 160 corresponding to the syringe A is shown).

  As shown in FIG. 2, a plurality of buttons 116 (shown as “input unit 116” in FIG. 3) for switching various operations of the injection head are arranged on the upper surface of the casing of the injection head 110. The injection head 110 includes two piston drive mechanisms 130 and 130 that push the piston member 212 of each syringe into the cylinder member 211. The piston drive mechanism 130 includes a motor (not shown) as a drive source, a link mechanism (not shown) for transmitting the power, a presser member that moves in the front-rear direction, and the like. A pair of claws are provided on both the left and right sides of the front end portion of the presser member, and the flange portion of the piston member 212 is gripped by the pair of claws.

  In addition, although illustration is abbreviate | omitted, the IC tag which memorize | stores the information of a chemical | medical solution, etc. may be attached to syringe A, B. In this case, the injection head 110 may have an IC tag reader for reading information of the IC tag. For example, information related to a syringe (syringe identification data, cylinder member pressure resistance, cylinder member inner diameter, piston member stroke, etc.) may be stored in the IC tag. The identification data may be a production number, for example. In the case of the prefilled type, information (for example, product name, component information, viscosity, expiration date, etc.) of the chemical solution filled in the syringe may be stored.

  As shown in the block diagram of FIG. 3, the controller device 50 performs various calculations with a touch panel display 51 for displaying predetermined information, a hand switch 57 for receiving predetermined input from an operator, and the like. And a control unit 55. The controller device 50 is connected to the imaging device 300 via an interface (not shown), and is configured to exchange data between them. The controller device 50 is connected to the injection head 110 via the cable 102 (FIG. 1) and configured to exchange data between them. The controller device 50 includes a storage unit (not shown), which stores, for example, injection condition data, data related to a chemical solution read from an IC tag of a syringe, and the like.

  The controller 55 of the controller device 50 performs the following processing as an example, as in the conventional device: processing for receiving input of predetermined information by the operator, processing for determining injection conditions according to the input, and determined injection A process for displaying the conditions on the display, a process for operating the piston drive mechanism 130 of the injection head 110 according to the finally determined injection conditions, a process for monitoring the pressure of the chemical solution during the injection of the chemical solution, and displaying it on the display 51.

  Before describing specific processing performed by the controller device 50 of the present embodiment, first, an experiment in which the influence of the difference in the size of the subject on the contrast effect will be described below. FIG. 4A is a scan plan image obtained by imaging a phantom produced assuming a subject.

  In this experiment, a conical phantom having a cross-sectional shape shown in FIG. The phantom 60 has a conical case 62 filled with agar containing a diluted contrast agent, and a hollow pipe 61 is disposed on the shaft portion thereof. The pipe 61 is filled with a constant concentration of contrast medium. This phantom 60 is connected to the pipe 61

  FIG. 4C schematically shows a cross-sectional image of the conical phantom 60 at the position (i) and a cross-sectional image at the position (iii). In the image (i) in which the amount of agar around the pipe 61 is small, the contrast CT value in the pipe 61 is high, and a relatively dark image is obtained. On the other hand, in the image with a large amount of agar (iii), the contrast CT value in the pipe 61 is low, and a relatively thin image is obtained. From this experiment, it was confirmed that even when the contrast agent concentration in the pipe 61 is constant, the CT value increases when the subject is small, whereas the CT value tends not to increase when the subject is large. .

  FIG. 4B shows a value obtained by accumulating the pixel density of the scan plan image of the phantom 60 in the horizontal direction, where the horizontal axis indicates the position and the vertical axis indicates the accumulated value of the pixel density. As shown in the figure, the cumulative value of pixel density is smaller as the amount of agar is smaller (i) and larger as the amount of agar is larger (iii). FIG. 5 shows the correlation between the cumulative value of the pixel density and the contrast CT value. In the standard curve of FIG. 5, the horizontal axis represents the cumulative value of pixel density, and the vertical axis represents the contrast CT value.

  As shown by the standard curve in FIG. 5, the contrast CT value is a relatively high value when the cumulative value of pixel density is small (when the X-ray absorption amount is small), and the cumulative value becomes large (X absorption amount). Decreases as the value increases. In FIG. 5, for example, when the subject is small and the cumulative value of pixel density is small as in (i), the CT value is relatively high and the gap with the target CT value is small. Therefore, the amount of contrast medium to be injected is relatively small. On the other hand, when the subject is large and the accumulated value is large, such as (iii), the CT value is relatively low and the gap with the target CT value is also large. Amount of contrast agent is required.

  In this way, it is more accurate to control the contrast agent amount and / or contrast agent concentration in consideration of the difference in the amount of X-ray absorption based on the scan plan image and the standard curve, which are actual patient data. This is desirable for setting conditions.

  In addition, the standard curve as shown in FIG. 5 is prepared in advance, for example, corresponding to each examination site. A corresponding one for each type of CT scanner used may be prepared in advance. The shape of the standard curve is not particularly limited, and may be, for example, a linear function or an exponential function.

In order to achieve this, the chemical injection device 100 of the present embodiment is configured to perform at least the following processing:
(A) a process of accepting input of information related to the amount of X-ray absorption in a cross section near the examination site;
(B) Processing for determining the amount of the contrast agent component to be injected into the patient using the X-ray absorption amount as one parameter.
More specifically, in the present embodiment, the following processing is performed.
(A1) processing for acquiring scan plan image data imaged by the imaging device;
(A2) a process of calculating a cumulative value of the pixel density of the scan plan image, a process of calculating a cumulative value of the pixel density in the body width direction of the patient near the examination site;
(B1) Processing for determining the amount of contrast agent component to be injected into a patient using the calculated cumulative value as one parameter.

  In the process (a1), the controller device 50 reads scan plan image data captured by the scanner main body 301 and temporarily stored in the control unit 302. The imaging procedure and the like are well known in the art and will not be described here. The data format of the scan plan image is not particularly limited, and any format may be used as long as the accumulated pixel density value can be obtained based on the image as described below. . Note that the controller device 50 (one example) may be configured to read, for example, other data such as imaging conditions by the imaging device 300 and patient information together with the scan plan image data.

  Next, in the process (a2), the scan plan image is analyzed. Specifically, the controller device 50 calculates the cumulative value of the pixel density in the body width direction (example) of the patient based on the read scan plan image data. FIG. 6 shows a schematic diagram of a scan plan image when the subject size is small, and a histogram of accumulated pixel density values. This histogram shows the position of the patient in the body axis direction and the cumulative value of the pixel density at that position. Note that the cumulative value of pixel density can be calculated by using image processing by software, for example.

  In FIG. 6A, a position A-i near the liver is shown as an example, and in FIG. 6B, a cumulative value of pixel density at that position is shown as X1. Note that this value X1 is larger than, for example, the cumulative value near the lung, which indicates that more X-rays are absorbed near the liver.

  Next, in the process (c), the injection amount of the contrast agent is determined using the accumulated value X1 as one parameter. As shown in FIG. 8, when the cumulative value is X1, the difference in CT value up to the target CT value is C-1, so that the contrast value of the contrast agent is increased so that this CT value increase by C-1 is obtained. The amount can be determined.

  It should be noted that other parameters (for example, at least one of age, sex, examination site, type of contrast agent, etc.) may be taken into account in order to determine the injection amount. The operator confirms the injection conditions determined by the chemical solution injection device 100, and fine adjustments are made as necessary to finalize the final injection conditions.

  On the other hand, FIG. 7 shows a schematic diagram of a scan plan image when the subject size is large, and a histogram of accumulated pixel density values. In this figure, as an example, the accumulated value of the pixel density at the position Bi near the liver is shown as X2. When the subject size is large, the accumulated value X2 is larger than when the subject is small (X1). In this case, as shown in FIG. 8, the difference in CT value up to the target CT value is C2, and in order to obtain the target CT, more contrast agents are used compared to the case where the subject is small. It is necessary to inject.

  As described above, in the chemical injection device 100 of this embodiment, a standard curve representing the relationship between the pixel cumulative value and the CT value as shown in FIG. 8 is prepared in advance, and when performing chemical injection, a scan plan is prepared. The cumulative value of the pixels of the image is obtained, and the contrast agent amount is determined based on the cumulative value and the standard curve.

  According to the chemical injection device 100 of the present embodiment configured as described above, a scan plan image of a patient is analyzed, a cumulative value of pixel density in the horizontal direction (patient width direction) is calculated, and the cumulative value is calculated. Since the amount of contrast medium is controlled with the value as one parameter, the amount of contrast medium (one example) can be determined with higher accuracy than conventional methods such as the so-called body weight method and lean body weight method. Moreover, according to such a system, it is also possible to automatically set the contrast agent amount in conjunction with the injection device 100 of the imaging device 300. In this case, since it is not necessary for the operator to manually input the patient's weight or the like, the setting operation of the injection conditions can be further simplified.

Furthermore, the present invention is not limited to the examples described above, and various modifications can be made.
For example, although the example in which the injection amount of the contrast agent is controlled is shown above, the present invention is not limited to this, and the concentration of the contrast agent may be controlled, or both the injection amount and the concentration may be controlled. Good. This is because even if the injection amount is the same, by controlling the concentration of the contrast agent, the amount of the component (for example, iodine) of the contrast agent is changed, and the same effect as described above can be obtained. The concentration of the contrast agent can be controlled, for example, by changing the mixing ratio of the physiological saline and the contrast agent.

[Specific example of determination of contrast medium amount]
FIG. 9 is a diagram for explaining an example of a method for determining the amount of contrast medium to be injected into a patient. As an example, the contrast agent amount may be determined as follows.
Arrow 85 in FIG. 9, CT value indicates that rises by Ya from the value Y ₀ when normal (without contrast injection) at a given inspection site. That is, the normal CT value of this examination site is Y ₀ , and the CT value after contrast enhancement is Y ₁ (point on the standard curve) because the CT value is increased by Ya due to the injection of the contrast medium. . As an example, the amount of contrast medium injected at this time is C ₁ [ml].

Here, it is considered that the CT value of the examination site is increased to Y _TRG . In this case, in order to increase the CT value from Y ₁ on the standard curve to Y _TRG , it is necessary to further increase by Y _b (see arrow 86). Here required amount of contrast medium C ₂ can be calculated by the following equation.

C ₂ = C ₁ × (Y _b / Y _a ) [ml]
The total amount of contrast agent C _TTL required to increase the CT value of the examination site from Y ₀ to Y _TRG is:
C _TTL = C ₁ + C ₂ [ml]
Can be obtained by calculating. The target CT value Y _TRG is a value that _rises and falls depending on the type of the examination site and how much contrast is required.

  According to such a determination method, it is possible to determine a more appropriate amount of contrast medium for a patient based on the above calculation formula (an example) and a standard curve. The calculation formulas that can be used in the determination method are not limited to the above, and can be variously changed based on, for example, clinical data.

[Example of body width, circumference, or FOV]
In the above, the example of controlling the contrast agent amount based on the cumulative value of the pixel density of the scan plan image has been described. However, the present invention is not limited to this, and the contrast agent amount and the like are determined based on the body width data of the patient. It is also possible to control. For example, the amount of contrast medium is controlled based on the body width Da in the case of the patient in FIG. 6, and based on the body width Db in the case of the patient in FIG. In this case, a standard curve as shown in FIG. 8 showing the correlation between the body width and the CT value is prepared in advance, and the contrast agent amount is determined based on the data and the measured body width data.

  When the body width is relatively narrow, a small amount of contrast agent is sufficient as in the case of X1 in FIG. 8, whereas when the body width is relatively wide, a larger amount of contrast agent is required as in the case of X2. It becomes. The body width may be automatically measured by image processing using software. Furthermore, it is also possible to control the amount of contrast medium or the like based on data on the circumference of the patient's body instead of or along with the body width.

  Although not limited thereto, the data of the patient's body width and body circumference may be read and used as stored in a server or the like in a hospital management system (not shown).

  The present invention further uses the size of a FOV (Feed of View) set when performing fluoroscopic imaging, instead of measuring the body width and circumference of the patient, and based on this data, the amount of contrast medium, etc. It may be one that controls. Also in this case, the chemical solution injection device 100 may automatically read the FOV data of the imaging device 300 and automatically determine the contrast agent amount and the like using the data as one parameter. As an example, in FIG. 6, the size of the FOV is indicated by W-a, and in FIG. 7, it is indicated by W-b. When the FOV size is relatively narrow, a small amount of contrast agent is sufficient as in the case of X1 in FIG. 8, whereas when the FOV size is relatively wide, a larger amount of contrast agent is required as in the case of X2. It becomes.

  As described above, the present invention obtains an X-ray absorption amount at a predetermined cross section based on a scan plan image, estimates a CT value increase at the examination site from the result, and accordingly, an appropriate contrast medium component The amount is to be determined. In addition to the above, for example, tube current data of the imaging apparatus can be used as data that can estimate the X-ray absorption amount. Conventionally, in the X-ray CT apparatus, for the purpose of reducing the exposure dose of a patient, proposals have been made to appropriately change the dose of X-rays to be irradiated according to the examination site (for example, the vicinity of the heart or the vicinity of the liver). In this case, as an example, the amount of tube current is relatively high in a region where the amount of X-ray absorption is relatively large (for example, the liver), while the amount of tube current is small in a region where the amount of absorption is relatively small (for example, near the heart). Relatively small. Based on such tube current data, the X-ray absorption amount for each examination site may be estimated and reflected in the contrast agent injection amount.

  Although not limited, tube current data can be represented as a histogram with the horizontal axis representing the patient site along the body axis and the vertical axis representing the tube current. The tube current data may be configured to be sent from the imaging device 300 to the chemical liquid injector 100.

  In FIGS. 6 and 7, as an example, the cumulative value is calculated at a position (Ai, Bi) in the vicinity of the liver, but this position can be appropriately changed according to the examination site. As to which position of the scan plan image the accumulated value is calculated (example), the position may be designated by an operator's manual input, for example. Alternatively, a predetermined position may be automatically set corresponding to the examination site selected by the operator among the examination site candidates (for example, heart, liver, kidney, etc.) displayed on the controller device 50.

  In the above embodiment, the cumulative value is calculated along the horizontal direction of the scan plan image (for example, FIG. 6A), but the present invention is not limited to this. When the scan plan image is an image obtained by viewing the patient from the side, a cumulative value (in other words, an X-ray absorption amount) may be calculated along the thickness direction of the patient's body.

  As mentioned above, although one form of this invention was demonstrated paying attention to the amount of X-rays absorbed by scano imaging, this invention is not limited to this, and the X-ray attenuation coefficient and effective energy of the CT scanner are one of the parameters. It is also possible to determine the amount of contrast agent component.

  Further, in the present invention, it is not necessary to be configured to exchange data relating to the amount of X-ray absorption (data of scan plan image in one example) between the chemical injection device 100 and the CT imaging device 300. In one embodiment, a configuration may be adopted in which a doctor directly inputs predetermined data relating to the amount of X-ray absorption to the drug solution injector.

  In the above-described embodiment, the chemical injection device 100 performs a process of reading scan plan image data, a process of calculating a cumulative value of pixel density, and a process of determining a contrast agent amount and the like based on the cumulative value Met. However, means for performing these processes may be provided separately from the chemical solution injector 100. As an example, the control unit 302 of the imaging apparatus 300 may have such a function.

  In the above, the chemical liquid injection device 100 including the two-tube injection head 110 has been described. However, in the present invention, if the amount and / or concentration of the contrast agent is scheduled to be changed, the configuration of the injection head 110 is as follows. It is not limited. Therefore, it is not limited to the two-cylinder type, but may be a single-cylinder type injection head to which only a syringe filled with a contrast medium is attached.

The present invention is also directed to a method for determining the amount of contrast agent component to be injected into a patient. This method
(A) receiving an input of information relating to the amount of X-ray absorption in a cross section near the examination site;
(B) determining the amount of the contrast agent component to be injected into the patient using the X-ray absorption amount as one parameter;
including.

  Another method according to the present invention is as follows.

In the step (a),
(A1) acquiring scan plan image data imaged by the imaging device;
(A2) calculating a cumulative value of the pixel density of the scan plan image, and calculating a cumulative value of the pixel density in the body width direction of the patient near the examination site;
In the step (b),
(B1) The amount of contrast agent component to be injected into a patient is determined using the calculated cumulative value as one parameter.

Yet another way is
A liquid injector for injecting a contrast medium into a patient, configured to communicate with an imaging device that captures a fluoroscopic image of the patient,
(C) obtaining body data or imaging data corresponding to an X-ray absorption amount in a cross section near the examination site;
(D) determining the amount of contrast agent component to be injected into the patient using the acquired data as one parameter.

DESCRIPTION OF SYMBOLS 1 Imaging system 50 Controller apparatus 60 Phantom 61 Pipe 62 Case 100 Chemical solution injection apparatus 102 Cable 110 Injection head 114 Syringe holding part 116 Button 130 Piston drive mechanism 300 Imaging apparatus 302 Control unit A, B Syringe

Claims (9)

A medical fluid injection device for injecting a contrast medium into a patient,
(A) a process of accepting input of information related to the amount of X-ray absorption in a cross section near the examination site;
(B) Using the X-ray absorption amount as one parameter, a process of determining the amount of contrast agent component to be injected into the patient;
The equipped with a line intends control section,
In the process (a),
(A1) processing for acquiring scan plan image data imaged by the imaging device;
(A2) A process of calculating a cumulative value of the pixel density of the scan plan image, and a process of calculating a cumulative value of the pixel density in the body width direction of the patient near the examination site,
In the process (b),
(B1) Using the calculated cumulative value as one parameter, the amount of contrast agent component to be injected into the patient is determined;
In the process (b1),
Preliminarily prepared data indicating the correlation between the cumulative value of the pixel density and the CT value;
The calculated cumulative value, and
The amount of contrast agent component to be injected into the patient is determined ,
A chemical injection device configured as described above . The chemical injection device according to claim 1 , wherein the process (a2) is performed by software image processing. A medical fluid injection device for injecting a contrast medium into a patient,
(C) a process of acquiring body data or imaging data corresponding to an X-ray absorption amount in a cross section near the examination site;
(D) using the acquired data as one parameter, a process of determining the amount of contrast agent component to be injected into the patient;
Yeah Bei the line intends control section,
In the process of (c), data on the width or circumference of the patient is acquired,
In the process of (d), the amount of the contrast agent component to be injected into the patient is determined using the data of the body width or circumference as one parameter.
A chemical injection device configured as described above . A medical fluid injection device for injecting a contrast medium into a patient,
(C) a process of acquiring body data or imaging data corresponding to an X-ray absorption amount in a cross section near the examination site;
(D) using the acquired data as one parameter, a process of determining the amount of contrast agent component to be injected into the patient;
The equipped with a line intends control section,
In the process (c), data of the size of the maximum effective field of view (FOV: Field of View) indicating the imaging range is acquired,
In the process (d), the amount of the contrast agent component to be injected into the patient is determined by using the acquired FOV size data as one parameter.
A chemical injection device configured as described above . An injection head that holds the syringe and injects the liquid medicine in the syringe toward the patient;
A controller device connected to the injection head;
With
The chemical | medical solution injection device of any one of Claims 1-4 with which the said control part is provided in the said controller apparatus. The chemical injection device according to claim 5 , wherein the injection head is of a two-cylinder type to which a syringe filled with a contrast medium and a syringe filled with physiological saline are attached.   The chemical solution injection device according to claim 1, wherein in the process (b), a volume of a contrast medium to be injected is determined.   The chemical solution injection device according to claim 1, wherein in the process (b), a concentration of a contrast agent to be injected is determined. The chemical injection device according to any one of claims 1 to 8 ,
An imaging device for imaging a fluoroscopic image of a patient;
An imaging system comprising:

Images