JP4258855B2 - Radiographic imaging display method and radiographic imaging display device - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a radiographic imaging display method and a radiographic imaging display device that perform imaging and display using a radiographic image conversion panel such as a stimulable phosphor (stimulable phosphor plate).
[0002]
[Prior art]
When a certain type of phosphor is irradiated with radiation (X-rays, α-rays, β-rays, r-rays, ultraviolet rays, etc.), a part of the radiation energy is accumulated in the phosphors. It is known that when the phosphor is irradiated with excitation light such as visible light, the phosphor exhibits stimulated emission according to the accumulated energy. A phosphor exhibiting such properties is called a storage phosphor or a stimulable phosphor.
[0003]
Using this stimulable phosphor, radiation image information of a human body or the like is once recorded on a storage phosphor (radiation image conversion panel such as a stimulable phosphor plate) provided on the sheet, and this radiation image is recorded. It is possible to scan the conversion panel with excitation light such as laser light to generate stimulated emission light, and photoelectrically read out the obtained stimulated emission light to obtain an image signal.
[0004]
In addition to the radiation image conversion panel, a film sensitive to radiation, a semiconductor detector, or the like can be used.
[0005]
[Problems to be solved by the invention]
In the conventional general radiographic imaging apparatus, the distance between the focal point of the X-ray tube 1 and the subject M (a in FIG. 8) is the distance from the subject M to the radiographic image conversion means (radiation image conversion panel 2) (FIG. 8). Therefore, the size of the image photographed on the radiation image conversion panel 2 is larger than that of the actual subject M.
[0006]
For this reason, when measuring the distance between two arbitrary points of the subject from the photographed image, there arises a problem that a true value cannot be obtained.
In order to solve such a problem, a scale is arranged in the vicinity of the subject, and shooting is performed to capture the scale.
[0007]
However, the task of copying the scale is troublesome. Further, if the scale and the subject overlap, the scale cannot be read. Further, there is a problem that accurate reading cannot be performed because the scale to be actually measured does not match the scale.
[0008]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a radiographic image capturing and displaying method capable of accurately measuring the distance between arbitrary captured points with a simple operation, and The object is to provide a radiographic imaging display device.
[0009]
[Means for Solving the Problems]
Therefore, the invention as means for solving the problems will be described below .
[0012]
(1) According to the first aspect of the present invention, the subject is irradiated with radiation from the X-ray tube of the X-ray irradiation apparatus movable so that the distance between the X-ray tube and the subject changes, and is photographed by the radiation image converting means. A radiographic imaging display method for displaying a captured image, wherein a marker with an interval g is arranged in the vicinity of an imaging position by the radiographic image conversion means, and is imprinted together with the subject, and the marker imprinted on the radiographic image conversion means The marker enlargement magnification β = h / g is calculated with reference to the interval h, and the marker enlargement magnification β, the distance a from the X-ray tube to the subject, and the position where the marker is arranged from the X-ray tube Is calculated based on a distance c (where c> a) , and a predetermined image of the subject is displayed when the captured image is displayed using the imaging magnification α. Displaying the distance between positions A radiographic imaging display method comprising.
[0013]
According to a sixth aspect of the present invention, a subject is irradiated with radiation from an X-ray tube of an X-ray irradiation apparatus movable so that the distance between the X-ray tube and the subject is changed, and is photographed by a radiation image conversion means. A radiographic image capturing and displaying apparatus that reads an image captured by an image converting unit by a reading unit and displays the read image on a display unit, and is near the imaging position by the radiographic image converting unit and together with the subject a radiographic image The marker magnification magnification β = h / g is calculated with reference to the marker arranged at an interval g for imprinting on the conversion means and the interval h between the markers imprinted on the radiation image conversion means, and the marker magnification beta, the distance from the X-ray tube to the subject a, and the distance from the X-ray tube to a position placing the marker c (however, c> a) referring to photographing magnification of the object to computing means for calculating α = (c / a) β, and display control means for displaying a distance between predetermined positions of the subject when the photographed image is displayed using the photographing magnification α. It is the radiographic imaging display device provided with it.
[0014]
In these inventions, the photographing magnification of the subject is calculated with reference to the distance from the radiation source to the subject, the distance from the subject to the radiation image converting means, and the inter-marker distance imprinted on the radiation image converting means. By displaying the distance between the predetermined positions of the subject when displaying the captured image, it is possible to accurately measure the distance between any captured points with a simple operation Become.
[0017]
(2) According to a second aspect of the invention, the radiation image capturing method of displaying (1), to measure the distance a from the X-ray tube to the subject, calculates the photographing magnification α by using the measurement result It is characterized by that.
[0018]
The invention according to claim 7 is the radiographic imaging display apparatus according to ( 1 ), further comprising distance measuring means for measuring a distance a from the X-ray tube to the subject, and using a measurement result of the distance measuring means. The calculation means calculates the photographing magnification α .
[0019]
In these inventions, the photographing magnification of the subject is calculated by referring to the variable distance from the radiation source to the subject, the distance from the subject to the radiation image converting means, and the inter-marker distance imprinted on the radiation image converting means. By displaying the distance between the predetermined positions of the subject when displaying the captured image using the magnification, even if the position of the radiation source is variable, it is possible to select any point that has been captured with a simple operation. It becomes possible to measure the distance between them accurately.
[0023]
( 3 ) According to the invention described in claim 3, in the radiographic image radiographing display method of (1) to ( 2 ), the designation of a plurality of positions is interactively accepted on the radiographic image display screen, and the distance between the designated positions Is numerically displayed.
[0024]
According to an eighth aspect of the present invention, in the radiographic image capturing / displaying device of (1) to ( 2 ), operation means for interactively accepting designation of a plurality of positions using a captured image display screen on the display means . and, the display control means causes the numerical display of the distances determined for between at the position specified by said operating means, it is characterized.
[0025]
In these inventions, since the distance between any designated positions is numerically displayed, accurate distance display is possible.
( 4 ) In the invention according to claim 4, in the radiographic image radiographing display method of (1) to ( 2 ), designation of a plurality of positions is interactively accepted on the radiographic image display screen, and the designated positions are connected. A scale having a scale with a predetermined interval is displayed in parallel with the straight line.
[0026]
According to the ninth aspect of the present invention, in the radiographic image capturing and displaying apparatus according to any one of (1) to ( 3 ), there is provided an operation unit that interactively accepts designation of a plurality of positions using a captured image display screen on the display unit . and, wherein the display control unit, in parallel with the straight line connecting the designated location by the operation means, to display a scale having a scale of predetermined intervals, characterized in that.
[0027]
In these inventions, since the scale is displayed so as to be parallel to any specified position, it is possible to accurately read the distance.
( 5 ) The invention according to claim 5 is the radiographic image capturing / displaying method according to (1) , wherein the imaging magnification correction processing is performed using the imaging magnification α , and the captured image is displayed in actual size. It is characterized by.
[0028]
According to a tenth aspect of the present invention, in the radiographic image capturing / displaying device according to any one of (1) to (2), the radiographic image capturing / displaying apparatus includes image processing means for performing a photographing magnification correction process using the photographing magnification α , The size is displayed on the display means.
[0029]
In these inventions, since the image itself is displayed as an actual size, accurate measurement is possible by the user applying a scale to the image. Moreover, it is effective not only for image display but also for print output.
[0030]
(9) In each of the above inventions, the radiation image conversion means corresponds to various image conversion means such as a radiation image conversion panel or a film having sensitivity to radiation.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 is a block diagram showing an example of a radiographic imaging display apparatus according to each embodiment of the present invention or an apparatus that implements a radiographic imaging display method according to each embodiment of the present invention.
[0032]
In FIG. 1, a control unit 10 is a control means for controlling the operation of each part of the apparatus, and various types relating to photographing, reading, image processing, image storage, etc. according to an instruction input from the operation unit 20 or a built-in operation control program. Control is performed.
[0033]
The X-ray irradiation apparatus 30 includes an X-ray tube 31 and irradiates the subject M with X-rays based on the control of the control unit 10.
The imaging / reading apparatus 40 is an apparatus that performs imaging and reading. The imaging / reading apparatus 40 includes a radiation image conversion panel P as a recording medium. The scanner unit 41 reads an image captured on the radiation image conversion panel P.
[0034]
In this embodiment, an example using the radiation image conversion panel P as the radiation image conversion means will be described. However, when a film is used as the radiation image conversion means, reading may be performed with a digitizer. In addition to the photostimulable phosphor plate, the radiation image conversion panel also includes a semiconductor detector.
[0035]
The image processing unit 50 performs various types of image processing. In this embodiment, the image processing unit 50 serves as an image processing unit that performs a photographing magnification correction process based on a photographing magnification and a display control unit that superimposes a scale display on the image. Yes.
[0036]
The image storage unit 60 is an image storage unit composed of an optical disk device, a magnetic disk device, or the like, and stores and stores image data according to instructions from the control unit 10.
[0037]
The display unit 70 is a display unit that displays various states of the apparatus, and displays a radiation image obtained by reading, a state where individual images are combined, and the like. The printer 80 is an image output unit that performs image formation (hard copy creation) of an image that has been read and processed by the image processing unit 50.
[0038]
Here, the operation of this embodiment will be described with reference to FIG. FIG. 2 schematically shows the relationship between the distance between each part and the photographing magnification.
First, an image is stored in the radiation image conversion panel P by photographing, and this image is read by the scanner unit 41 to generate image data in a frame memory or the like in the image processing unit 50.
[0039]
Here, the distance between the X-ray tube 31 and the subject M is a, and the distance between the subject M and the radiation image conversion panel P is b. Here, a and b are fixed values.
In this case, a subject whose actual size is H is photographed as H ′. This relationship can be expressed by the following equation.
[0040]
a: b = (a + b): H ′
H ′ = ((a + b) / a) H
That is, if the shooting magnification is α, α = ((a + b) / a).
[0041]
Then, in a state where the generated image data is displayed on the display unit 70, input of arbitrary two points from the operation unit 20 is received interactively via a menu screen or the like.
An accurate distance D in the subject M is obtained by multiplying the actually measured value of the distance d on the image data by the reciprocal of the photographing magnification α between the two received points.
[0042]
That is, the control unit 10 as a calculation means obtains the photographing magnification α by the above-described formula, and further obtains an accurate distance D as D = (a / (a + b)) d.
The distance D thus obtained is numerically displayed at a position that does not interfere with image display as shown in FIG. Thereby, the operator can know the distance between the designated arbitrary positions correctly.
[0043]
Further, as shown in FIG. 3B, a scale having a scale having a predetermined interval is displayed in parallel with a straight line connecting between designated positions. Thereby, the operator can know the distance between the designated arbitrary positions, the space | interval between them, etc. correctly. In this case, a scale having a scale corrected by the reciprocal of the photographing magnification α is displayed.
[0044]
In the above-described case, the scale display may be performed by determining and displaying the side that is parallel to the straight line connecting the two points and does not interfere with the image display as much as possible. Further, numerical display and scale display may be used in combination.
[0045]
Furthermore, a scale having a scale corrected in advance by the reciprocal of the imaging magnification α is prepared in the corner of the display screen, and the operator can freely move the scale by using the pointing device of the operation unit 20 so that the operator can select any two points. You may make it measure a distance.
[0046]
Further, the image processing unit 50 may reduce the image data itself by the reciprocal of the photographing magnification α so that an actual size image can be displayed or printed. In this case, the original image is stored separately, and display image data or print image data is generated using the reciprocal of the shooting magnification α. In this way, it is possible to measure the display screen or print on a normal scale.
[0047]
Incidentally, in general, the distance b between the subject M and the radiation image conversion panel P is constant, but there is also a demand for changing the distance between the X-ray tube 31 and the subject M for a.
[0048]
Therefore, as shown in FIG. 4, it is assumed that the X-ray irradiation apparatus 30 is disposed on a moving mechanism 91 that can be moved by a rail or the like. When the movable X-ray irradiation apparatus 30 is used in this way, the operator measures the distance a from the X-ray tube 31 to the subject M, and inputs the value from the operation unit 20. And the control part 10 calculates | requires imaging | photography multiple by the type | formula mentioned above, and makes it perform the process of correction | amendment calculation.
[0049]
A magnetic code corresponding to the distance or position is attached to the rail or the like of the moving mechanism 91, and a magnetic reading unit is provided on the X-ray irradiation device 30 side, so that the distance between the X-ray tube 31 and the subject M can be set to a. Can be measured automatically. Therefore, when the X-ray irradiation apparatus 30 is configured to be movable, the above-described correction calculation is automatically performed.
[0050]
Further, as shown in FIG. 5, a distance measuring unit 92 is provided in the vicinity of the X-ray tube 31 inside the X-ray irradiation apparatus 30, and the distance between the X-ray tube 31 and the subject M can be automatically measured for a. Therefore, when the X-ray irradiation apparatus 30 is configured to be movable, the above-described correction calculation is automatically performed. The distance measuring unit 92 can be a known distance measuring means using infrared rays, ultrasonic waves, or the like.
[0051]
Note that the distance (a + b) from the X-ray tube 31 to the radiation image conversion panel P can also be measured by performing distance measurement without using the distance measurement unit 92 in FIG. . Even in this way, when the X-ray irradiation apparatus 30 is configured to be movable, the above-described correction calculation is automatically performed.
[0052]
Further, as described above, by obtaining the distance (a + b) from the X-ray tube 31 to the radiation image conversion panel P and the distance a between the X-ray tube 31 and the subject M, the subject M and the radiation image conversion panel are obtained. The distance b from P can be calculated. As a result, it is possible to correct fluctuations in the photographing magnification α due to differences in the position of the subject M.
[0053]
In addition, as shown in FIG. 6, an embodiment in which markers m at predetermined intervals are arranged at predetermined positions of the photographing / reading apparatus 40 and correction is performed with an enlargement magnification of the markers m will be described below.
[0054]
That is, as shown in FIG. 7A, markers m with a predetermined interval are arranged in the vicinity of the imaging position (predetermined position of the imaging / reading device 40), and the image is imprinted on the radiation image conversion panel P together with the subject.
[0055]
In this case, it is desirable to place the marker m at a position that does not interfere with the captured image, that is, a position that appears at the end of the radiation image conversion panel P. The marker m does not pass X-rays or has a predetermined transmittance, and can be discriminated on the image data.
[0056]
As shown in FIG. 7B, when the interval of the marker m is g, images are taken on the radiation image conversion panel P with an interval of h. Here, if the marker magnification is β, β = h / g.
[0057]
Further, if the position where the marker m is arranged is a distance c from the X-ray tube 31, the marker enlargement magnification β can be expressed as β = (a + b) / c.
The shooting magnification α is
α = ((a + b) / a)
= (C / a) β
It becomes.
[0058]
In this case, c is a constant value or a value determined by movement, and β is also a value determined irrespective of the subject M. Therefore, by determining the distance from the X-ray tube 31 to the subject M by the distance measuring means described above, the subject position It is possible to correct a photographing magnification error caused by the difference.
[0059]
In each of the above embodiments, the description has been given with the photographing / reading device 40 that performs photographing and reading in parallel. However, the present invention is not limited to this, and the device that performs photographing and reading separately. It is possible to perform the same operation even in a system.
[0060]
【The invention's effect】
As described above in detail, according to each invention described in this specification, the following effects can be obtained.
[0061]
In the present invention, the shooting magnification of the subject is calculated with reference to the distance from the radiation source to the subject and the distance from the subject to the radiation image converting means, and the subject is displayed when the captured image is displayed using the shooting magnification. By displaying the distance between the predetermined positions, it is possible to accurately measure the distance between any captured points with a simple operation.
[0062]
In the present invention, the photographing magnification of the subject is calculated by referring to the distance from the radiation source to the subject, the distance from the subject to the radiation image converting means, and the inter-marker distance imprinted on the radiation image converting means. By displaying the distance between the predetermined positions of the subject when displaying the captured image using the magnification, it is possible to accurately measure the distance between any captured points with a simple operation become.
[0063]
In the above case, even if the position of the radiation source is variably configured, simple operation is possible by measuring the distance from the radiation source to the subject and calculating the imaging magnification using the measurement result. Thus, it becomes possible to accurately measure the distance between any shot points.
[0064]
In the above case, it is also possible to obtain the distance from the radiation source to the subject, and to correct the magnification error caused by the difference between the subject position and the marker position. It is effective to accurately measure the distance.
[0065]
In the present invention, a plurality of positions are interactively accepted on the captured image display screen, and the distance between the designated positions is displayed numerically, thereby enabling accurate distance display.
[0066]
It is also possible to accurately read a distance by interactively accepting designation of a plurality of positions on the display screen of the photographed image and displaying a scale having a scale having a predetermined interval in parallel with a straight line connecting the designated positions. Is possible.
[0067]
Furthermore, by performing shooting magnification correction processing using the shooting magnification and displaying the captured image in actual size, it is possible to perform accurate measurement by applying a scale to the image. Become. Moreover, it is effective not only for image display but also for print output.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an overall configuration of a radiographic imaging display device used in an embodiment of the present invention.
FIG. 2 is an explanatory diagram schematically showing the relationship between the distance between each part and the photographing magnification in the embodiment of the present invention.
FIG. 3 is an explanatory diagram showing an example of a screen display according to the embodiment of the present invention.
FIG. 4 is a configuration diagram showing another example of the overall configuration of the radiographic image capturing and displaying apparatus used in the embodiment of the present invention.
FIG. 5 is a configuration diagram showing still another example of the overall configuration of the radiographic imaging display device used in the embodiment of the present invention.
FIG. 6 is a configuration diagram showing still another example of the overall configuration of the radiographic image capturing and displaying apparatus used in the embodiment of the present invention.
FIG. 7 is an explanatory diagram showing a state of a marker and an enlargement magnification in the radiographic image capturing and displaying apparatus used in the embodiment of the present invention.
FIG. 8 is an explanatory diagram showing an enlargement state that occurs in conventional radiography.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Control part 20 Operation part 30 X-ray irradiation apparatus 31 X-ray tube 40 Imaging | photography / reading apparatus 41 Scanner 50 Image processing part 60 Image storage part 70 Display part 80 Printer

Claims (10)

A radiation image capturing and displaying method for irradiating a subject with radiation from an X-ray tube of an X-ray irradiation apparatus movable so that the distance between the X-ray tube and the subject changes, and displaying a captured image on a radiation image converting means There,
Place a marker with an interval g in the vicinity of the imaging position by the radiological image conversion means and imprint with the subject,
A marker magnification β = h / g is calculated with reference to the interval h between the markers imprinted on the radiation image conversion means,
Based on the marker magnification magnification β, the distance a from the X-ray tube to the subject, and the distance c from the X-ray tube to the position where the marker is placed (where c> a) , the subject imaging magnification α = (C / a) β is calculated,
A radiographic imaging display method, wherein a distance between predetermined positions of a subject is displayed when displaying a captured image using the imaging magnification α.   2. The radiographic imaging display method according to claim 1, wherein a distance a from the X-ray tube to the subject is measured, and the imaging magnification α is calculated using the measurement result.   The radiographic image radiographing display method according to claim 1 or 2, characterized in that designation of a plurality of positions is interactively received on a radiographed image display screen, and a distance between the designated positions is numerically displayed.   2. A scale having a scale with a predetermined interval is displayed in parallel with a straight line connecting the designated positions, by accepting designation of a plurality of positions interactively on the display screen of the photographed image. 3. A radiographic imaging display method according to 2.   The radiographic imaging display method according to claim 1, wherein imaging magnification correction processing is performed using the imaging magnification α, and the captured image is displayed in a real size. An object is irradiated with radiation from an X-ray tube of an X-ray irradiation apparatus that can move so that the distance between the X-ray tube and the subject changes, and is imaged by the radiation image conversion unit, and the image captured by the radiation image conversion unit A radiographic imaging display device that reads the image by the reading means and displays the read image on the display means,
Markers that are located in the vicinity of the imaging position by the radiological image conversion means and are spaced apart by an interval g for imprinting on the radiographic image conversion means together with the subject;
The marker magnification magnification β = h / g is calculated with reference to the marker interval h imprinted on the radiation image conversion means, the marker magnification magnification β, the distance a from the X-ray tube to the subject, and The imaging magnification α = (c / a) β of the subject is calculated with reference to the distance c (where c> a) from the X-ray tube to the position where the marker is placed ,
Computing means for calculating
Display control means for displaying a distance between the predetermined positions of the subject when displaying a photographed image using the photographing magnification α;
A radiographic imaging display device comprising:   7. A distance measuring unit that measures a distance a from the X-ray tube to the subject is provided, and the calculation unit calculates the imaging magnification α using a measurement result of the distance measuring unit. The radiographic imaging display apparatus described. Operation means for accepting designation of a plurality of positions interactively using a display screen of a photographed image on the display means;
The radiographic imaging display apparatus according to claim 6, wherein the display control unit numerically displays a distance obtained between positions designated by the operation unit. Operation means for accepting designation of a plurality of positions interactively using a display screen of a photographed image on the display means;
9. The scale according to claim 6, wherein the display control unit displays a scale having a scale having a predetermined interval in parallel with a straight line connecting positions designated by the operation unit. Radiographic imaging display device.   7. The image processing device according to claim 5, further comprising an image processing unit that performs a shooting magnification correction process using the shooting magnification α, and displays the captured image on a display unit in a real size. The radiographic imaging display apparatus described in 1.

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