JP2003180671A - Mobile x-ray apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile X-ray apparatus which can simply measure an X-ray exposure dose. <P>SOLUTION: A distance from a bed 108 to a X-ray source 101 is measured by a range finder 109, the exposure dose for an object 110 to be examined is determined from the measured distance and irradiation conditions of the X-ray source, and the determined exposure dose is displayed on a display 106 together with an X-ray photogram of the object 110 to be examined. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile X-ray apparatus capable of measuring and managing the exposure dose or integrated exposure dose of a patient (subject).

[0002]

2. Description of the Related Art A conventional mobile X-ray apparatus includes an X-ray source for irradiating a subject with X-rays, and an X-ray detector arranged to face the X-ray source to detect transmitted X-rays of the subject. A supporter that movably supports the X-ray source and the X-ray detector, and a carriage that mounts the supporter and a power supply that supplies electrical equipment such as the X-ray source. By moving
It is made movable in the operating room.

[0003] In recent years, the applications have been expanded due to the increased use in the emergency room and the increased number of imaging (DSA imaging) in the operating room in combination with the image processing apparatus. With such a mobile X-ray apparatus, X-ray fluoroscopic imaging of a subject can be performed easily, but measurement and management of X-ray exposure dose are not supported, and there is a problem in how to perform them. . The measurement and management of the X-ray exposure dose is performed by, for example,
There is a method in which a dosimeter for measuring the X-ray dose is attached, a list is created for each subject, and the exposure dose and integrated exposure dose are measured and calculated.

[0004]

However, the method of mounting and managing the above dosimeter is contrary to the requirement that the housing is made as compact as possible in the mobile X-ray apparatus whose main purpose is to be movable. However, there are various problems that are difficult to overcome, such as complicated management of the exposure dose and cumulative exposure dose according to the list for each subject, and the high price of the dosimeter.

An object of the present invention is to provide a mobile X-ray apparatus which can easily measure the X-ray exposure dose.

Another object of the present invention is to provide a mobile X-ray apparatus which can easily calculate an integrated X-ray exposure dose.

[0007]

The above-mentioned object is to provide an X-ray source for irradiating a subject placed on a bed with X-rays, and an X-ray detector arranged opposite to the X-ray source for detecting transmitted X-rays of the subject. X-ray detector, mobile X supporting the X-ray source and the X-ray detector movably, and a trolley on which the support and a power supply for supplying the X-ray source are mounted. In the X-ray apparatus, means for measuring the distance between the couch or the subject and the X-ray source, the measured distance, the X-ray irradiation condition of the X-ray source, and the specific condition of the supporter, This is achieved by providing a means for obtaining the exposure dose of the specimen and a means for outputting the obtained exposure dose.

[0008] Further, the above and other objects are that the means for storing the exposure dose in association with the specific information of the subject and the imaged region, and the same subject and the same imaged region as the stored exposure dose. Further, it is achieved by providing means for integrating the stored exposure dose and the exposure dose measured this time to obtain an integrated exposure dose, and means for outputting the obtained integrated exposure dose.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a mobile X adopting the present invention.
It is a block diagram which shows the structural example of a line device.

The above-mentioned mobile X-ray apparatus includes X-ray sources 101, X
A line detector 102, a C arm 103, a control unit 104, a computing unit 105, a display unit 106, a carriage 107, a bed 108, and a distance meter 109 are provided.

The X-ray source 101 is the subject 11 on the bed 108.
Irradiate 0 with X-rays. The X-ray detector 102 is an X-ray source 101.
The image intensifier (I.I.
I. ) As an example, it can be replaced with an X-ray flat sensor which is being developed recently. The C-arm 103 is the X-ray source 10
1 and I. I. 102 is movably supported. Control unit 10
Reference numeral 4 controls the mobile X-ray apparatus and controls each component.
The calculation unit 105 uses the I.D. I. The signal of the transmitted X-ray of the subject detected by 102 is processed. The display 106 displays the signal-processed one as an X-ray image. Dolly 107 is C
An arm 103 and a power supply for supplying electric equipment including the X-ray source 101 are mounted, and wheels provided at a lower portion of the carriage 1 allow the entire mobile X-ray apparatus to move. The range finder 109 is the bed 108 or the subject 110.
And the X-ray source 101 are measured. Then, the exposure dose is further calculated by using the distance and the irradiation condition of the X-ray source obtained by the calculator 105. The radiation dose obtained here is converted into numerical information by a character generator or the like, and is displayed and output on the display 106 together with the X-ray image. Here, the display device 106 such as a monitor attached to the housing of the mobile X-ray device is taken as an example, but if the examiner can know the radiation dose, it does not depend on the visual sense, and a speaker using a voice synthesizer is used. An auditory cognitive means for generating the exposure dose as a voice or a cognitive means for each sense may be combined in order to call attention to the diagnostician.

A configuration example of the arithmetic unit 105 shown in FIG. 1 will be described with reference to FIG. The calculator 105 has an image processing unit 201, a distance calculation unit 202, a dose calculation unit 203, a dose storage unit 204, an integrated dose calculation unit 205, a character generator 206, and an image synthesis unit 207.

The image processing unit 201 is an I.D. I. The signal of the transmitted X-ray of the subject detected by 102 is processed. The distance calculation unit 202 uses an ultrasonic or laser source / receiver as the X-ray source 1.
At 01, the time taken for the ultrasonic wave or laser to reach the receiver from the transmission source is measured, and the arithmetic unit 105 multiplies the arrival time and the speed of the ultrasonic wave or laser to obtain the distance. The dose calculation unit 203 causes the calculation unit 105 to calculate the exposure dose using the calculated distance and the irradiation condition of the X-ray source. This method is obtained by dividing the exposure dose of the X-ray irradiation surface by the X-ray irradiation condition (applied voltage * current * irradiation time of the X-ray tube) of the X-ray source by the square of the obtained distance. Is edited by the Japan Radiological Technologists Association, “<Revised and Enlarged Edition> Medical Radiation Data Book,” 33rd edition, September 27, 1984.
Since it is described on page 42 to page 42, detailed description is omitted here. The dose storage unit 204 provides a fluoroscopic image for each subject.
The radiation dose is classified according to the imaged region, and the exposure dose obtained in association with the classification is stored. The integrated dose calculation unit 206 adds the stored exposure dose and the exposure dose at the time of actual imaging, and updates and stores the dose storage unit 204. When displaying the radiation dose, the character generator 206 uses the dose calculation unit 20.
When converting the output of 3 into a numerical value and displaying the cumulative exposure dose,
The output of the integrated dose calculation unit 206 is converted into a numerical value. The image synthesis unit 207 synthesizes the output of the image processing unit 201 and the output of the character generator 206, and outputs the synthesized output to the display device 106.

Next, a procedure for displaying the exposure dose or the integrated exposure dose by the mobile X-ray apparatus of the present invention will be described. Mobile X
The line device has a built-in computer system and also has a built-in memory and the like.

The X-ray dose under the X-ray condition output from the X-ray source 101, the thickness dimension of the bed 108, and the absorbed X-ray dose per thickness unit of the bed are stored in advance in the memory of the mobile X-ray apparatus. Keep it. When the X-ray from the X-ray source 101 is not blocked by the bed 108, the X-ray source 101 and the subject 11
Since the bed 108, that is, the X-ray absorber is not present between 0, only the distance from the X-ray source 101 to the subject 110 may be considered as the exposure dose of the subject 110.

Therefore, the distance from the X-ray source 101 to the subject 110, which is the X-ray irradiation surface, measured by the distance meter 109 and the X-ray source 10 stored in the memory in advance.
1 calculates the X-ray dose under the X-ray condition and
The exposure dose of is displayed on the display unit 106 together with the X-ray image.
Here, since it is an element that changes the distance measured by the distance meter 109 depending on the mounting position of the C arm 103, C
If the position of the arm 103 is detected by a known method and a more accurate distance is obtained from the measured distance and the detected position of the C arm 103, the accuracy of the radiation dose can be further improved. In addition, the exposure dose is integrated in the integrated dose calculation unit 206,
The integrated exposure dose is displayed on the display 106. X-ray image, exposure dose and cumulative exposure dose can be displayed at the same time.
Each can also be displayed selectively.

When the X-ray from the X-ray source 101 is blocked by the bed 108, the bed 108 is interposed between the X-ray source 101 and the subject 110, so that the dose of the subject 110 is absorbed by the bed 108. Dose needs to be considered. Further, since the C-arm 103 irradiates the bed 108 with X-rays from an arbitrary angle by an arc / rotation motion, the thickness dimension of the bed 108 that absorbs X-rays changes. Since the C-arm 103 is provided with a detector such as a rotary encoder for detecting an arc angle / turning angle, the angle detection value of the 103C arm can be known by the arc angle / turning angle detector. And
The thickness of the bed 108 stored in advance and C
The thickness dimension of the bed 108 at an arbitrary angle of the C-arm 103 is calculated from the angle detection value of the arm 103. By converting the calculated thickness dimension of the bed 108 at an arbitrary angle of the C-arm 103 and the absorbed X-ray dose per thickness unit of the bed 108 stored in advance, the C-arm 1
The absorbed X-ray dose of the bed 108 at an arbitrary angle of 03 is calculated.

On the other hand, the X-ray dose on the surface of the bed 108, which is the irradiation surface, is measured by the range finder 109 from the X-ray source 101 to the X-ray irradiation surface, and the X-ray source 101 is stored in advance. It is calculated by the X-ray dose under the X-ray condition in. X on the surface of the bed 108 that is the calculated irradiation surface
From the dose, the bed 10 at an arbitrary angle of the C-arm 103
By subtracting the absorbed X-ray dose of 8
An exposure dose of 0 is obtained and displayed on the display unit 106.

As described above, according to the present embodiment, the X-ray source 101 for irradiating the subject 110 lying on the bed 108 with X-rays, and the subject 1 arranged opposite to the X-ray source 101.
10, an X-ray detector 102 for detecting transmitted X-rays, a C-arm 103 for movably supporting the X-ray source 101 and the X-ray detector 102, and a power supply for supplying the C-arm 103 and the X-ray source 101. Mobile X equipped with a carriage 107 for mounting
In the X-ray apparatus, a distance meter 109 for measuring the distance between the bed 108 and the X-ray source 101, and a calculation for obtaining an exposure dose of the subject 110 from the measured distance and the X-ray irradiation condition of the X-ray source 101. Since the instrument 105 and the indicator 106 for displaying the obtained radiation dose are provided, the X-ray radiation dose can be easily measured and displayed.

A dose storage unit 20 for storing the exposure dose in association with the specific information of the subject 110 and the imaged region.
4 and an integrated dose calculation unit 205 for calculating an integrated exposure dose by integrating the stored exposure dose and the exposure dose measured this time when the stored exposure dose is the same subject and the same imaging site. Since the display device 106 for displaying the calculated integrated exposure dose is provided, the integrated X-ray exposure dose can be easily calculated and displayed.

[0021]

INDUSTRIAL APPLICABILITY The present invention has an effect of providing a mobile X-ray apparatus capable of easily measuring X-ray exposure dose. Further, there is an effect of providing a mobile X-ray device capable of easily calculating the integrated X-ray exposure dose.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a mobile X-ray apparatus adopting the present invention.

FIG. 2 is a block diagram showing a configuration example of a computing unit in FIG.

[Explanation of symbols]

101 ... X-ray source, 102 ... X-ray detector, 103 ... C-arm, 104 ... Control unit, 105 ... Arithmetic unit, 106 ... Display, 107 ... Cart, 108 ... Sleeper, 109 ... Distance meter, 1
10 ... Subject

Claims (2)

[Claims] 1. An X-ray source for irradiating a subject lying on a bed with X-rays, an X-ray detector arranged to face the X-ray source to detect transmitted X-rays of the subject, and the X-rays. In a mobile X-ray apparatus including a supporter that movably supports a source and the X-ray detector, and a carriage that mounts the supporter and a power supply that supplies the X-ray source, the bed or the bed. Means for measuring the distance between the subject and the X-ray source, and means for obtaining the radiation dose of the subject from the measured distance, the X-ray irradiation condition of the X-ray source, and the specific condition of the supporter. And a means for outputting the obtained radiation dose, a mobile X-ray apparatus. 2. A means for storing the exposure dose in association with the specific information of the subject and an imaged part, and storing the same dose and the same imaged part as the stored dose,
2. The apparatus according to claim 1, further comprising: a unit that obtains an integrated exposure dose by integrating the stored exposure dose and a currently measured exposure dose, and a unit that outputs the obtained integrated exposure dose. Mobile X-ray device.