JPH06285059A - Method for measuring various densities of ossein and x-ray film body as well as sheet body with metallic piece for reference, and x-ray photographic device - Google Patents

Abstract

PURPOSE:To prepare the X-ray film body adequate for use in a method for measuring the various densities of the ossein in by comparing the density of the ossein with the degree of blackening of titanium metals, the sheet body with metallic pieces for reference for the reference of the degree of blackening of an X-ray film image adequate for use which can be easily used in combination at the time of X-ray photographing and to provide the X-ray photographing device. CONSTITUTION:The titanium metal is simultaneously photographed at the time of X-ray photographing and the various densities of the ossein is measured by vomparing the degree of blackening of the titanium metal and the degree of blackening of the ossein. For example, six kinds of titanium pieces 3 of 0.3 to 1.3mm thickness are stuck to transparent backing paper 2 and the sheet body 1 with the metallic pieces for reference are stuck to the X-ray film body and is photographed. The titanium pieces are simultaneously photographed. The degrees of blackening transmitted through the titanium and through the ossein are numerically read by a degree of blackening measured by a blackening measuring instrument by the film photographed. The comparison of the degrees of blackening is easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the density of bone material,
And an X-ray film body and a sheet body with a reference metal piece,
And an X-ray imaging apparatus.

[0002]

2. Description of the Related Art An X-ray image obtained by X-ray photography is used to grasp the density of bone. This is because the judgment is made based on the light and shade of the X-ray image, but since the bone shadow density is easily affected by the imaging conditions and the like, its accuracy is not sufficient. Conventionally, the judgment has been made qualitatively by comparing the shadow density not only with the target site but also with other sites.

[0003]

However, even in this measurement judgment, the influence of the photographing conditions such as the difference of the X-ray irradiation amount cannot be eliminated, and therefore, as a reference of the degree of blackening of the X-ray image, the influence of metal is used. It is possible to use an X-ray image, but if aluminum is used to obtain the required degree of blackening of the X-ray image, aluminum metal has a large amount of transmission by X-rays, so the shape and size of the piece used It is difficult to use because it has a large size, and it is unsuitable for applications in which a small shape is required.

For example, there are the following cases. In dental practice, to grasp the condition of the tissues around the roots and the jawbone,
This is done by X-ray photography, but for implant diagnosis, which is becoming more popular recently, or for the diagnosis that the jaw bone is invaded due to alveolar pyorrhea and the bone quality has become sparse, the bone quality especially around the root The superiority and inferiority of is an important factor. here,
In general, the quality of bone is determined by the density of bone, but when introducing the method using aluminum as a reference metal piece as described above to measure the density of bone, use the following method. Becomes That is, an aluminum piece is attached to an X-ray film, X-ray irradiation is performed,
Then, the degree of blackening is obtained from the amount of X-ray transmission of the aluminum piece, and the degree of densification of the bone is judged based on which thickness of the aluminum piece is comparable to that degree.

However, in this case, as described above, since the aluminum piece has a large amount of X-ray transmission, the shape and size of the aluminum piece used becomes large, and it becomes extremely difficult to insert it into the oral cavity. Almost impossible.
Furthermore, if the thickness of the aluminum piece is increased in order to reduce the amount of X-ray transmission in the aluminum piece, scattered X-rays will be generated inside the thick aluminum piece. Due to the influence of the scattered radiation, the blackening degree of the X-ray image in a predetermined thickness of the aluminum piece is also affected and a measurement error occurs. Therefore, a calculation for correcting the measurement error is required. Therefore, in the case of aluminum, it can be said that it is difficult to use aluminum either in this respect or as a clinical operation. There are still no imaging aids suitable for measuring bone density.

The present invention is based on the results of the above consideration by the present inventors. The present invention seeks to measure the density of bone by comparing the density of bone with the blackening degree of titanium metal. Another object of the present invention is to provide an X-ray film body suitable for easily and appropriately measuring the density of bone substance quantitatively. Another object of the present invention is to provide a reference metal piece-attached sheet body for X-ray film image blackness reference which is convenient for use and can be easily used in combination during X-ray photography. .

[0007]

According to the present invention, there are provided the following method for measuring the density of bone, an X-ray film body, and a sheet body with a metal piece for reference. If this is attached to a film fixing device and shared with a method for measuring the degree of blackening at the same time as standard photographing, the application effect is further improved. According to the present invention, when a bone X-ray is taken, a titanium metal piece is taken at the same time, and the degree of skeletal density is measured by comparing the degree of blackening of the titanium metal with an X-ray image and the degree of blackening of the bone with an X-ray image. It is characterized by. Further, the film body provided by the present invention is an X-ray film body composed of an X-ray film and a film housing body for housing the X-ray film, and a part of the film housing body has a thickness of A plurality of different titanium metal pieces are provided, and the thickness of each titanium metal piece is set to a predetermined thickness, an X-ray film body,
And an X-ray film, and an X-ray film body comprising a film container for accommodating the X-ray film, wherein a part of the X-ray film in the film container or a part of the inner surface of the film container is An X-ray film body having a titanium metal piece built-in, wherein a plurality of titanium metal pieces having different thicknesses are arranged, and the thickness of each titanium metal piece is set to a predetermined thickness. Further, in the above, the plurality of titanium metal pieces are attached to the film storage body, the X-ray film or the inner surface of the film storage body via a sheet-shaped base material integrally attached to the titanium metal pieces. The X-ray film body and the X-ray film body are dental X-ray film bodies which are placed in the oral cavity and X-rayed. The sheet body provided by the present invention is a sheet comprising a sheet-shaped base material and a plurality of X-ray film image blackening degree reference titanium metal pieces attached to the sheet-shaped base material and having different thicknesses. A body, a sheet body with a reference metal piece, wherein the thickness of each titanium metal piece on the sheet-shaped base material is set to a predetermined thickness, and the above-mentioned sheet body, A sheet body with a metal piece for reference, which is used by being attached to a dental X-ray film or a part of a film storage body thereof. Furthermore, it is a sheet body that can be attached to a film fixing device for standard photography to measure the degree of blackening under the same conditions.

[0008]

In the present invention, titanium metal is simultaneously photographed at the time of X-ray photography, and the density of bone is measured by comparing the degree of blackening of titanium with the degree of blackening of bone. The X-ray film image obtained was simultaneously formed with X-rays formed by transmitting titanium metal for photography.
It has a line image, and it is possible to appropriately measure the density of bone material by such X-ray photography. Based on the degree of blackening of the part made of titanium metal, it is possible to eliminate the influence of the radiography conditions as well as the scattered radiation of X-rays. Therefore, the adverse effects such as the influence on the blackening degree, and the like, resulting in the influence on the blackening degree can be suppressed, and the bone density can be satisfactorily measured with an appropriate blackening degree. Moreover, since the use of titanium metal can make the thickness extremely thin as compared with the aluminum piece, there is little influence of X-ray scattering to measure the degree of blackening of the same X-ray image, and the appropriate blackening is performed. In addition to the high degree of quality, the metal is also chemically and physically less susceptible to damage and can be heat disinfected or gas sterilized, thus enabling repeated use.

According to claims 2 to 5, X
An X-ray film body comprising a line film and a film housing body for housing the X-ray film, wherein a plurality of titanium metal pieces having different thicknesses are provided in a part of the film housing body, and each titanium metal piece is provided. The thickness of the metal piece is set to a predetermined thickness. An X-ray film body with a titanium metal piece, or a part of the X-ray film in the film container, or a part of the inner surface of the film container has a thickness of A plurality of different titanium metal pieces are arranged, and the thickness of each titanium metal piece is set to a predetermined thickness. A film storage body, or an X-ray film body attached to the X-ray film or the inner surface of the film storage body via a sheet-shaped base material integrally attached, and further,
In these X-ray film bodies, the X-ray film is a dental X-ray film which is placed in the oral cavity and X-rayed.
An X-ray film body is provided, which is suitable for easily and appropriately measuring the density of bone substance quantitatively, and enables simultaneous imaging of titanium metal easily. . In particular, according to the fifth aspect, it is possible to make the shape small by using pure titanium metal having a small X-ray transmission amount as a reference when measuring the density of bone quality at the time of dental treatment, and facilitate the insertion into the oral cavity.

Further, in the sheet body with a titanium metal piece according to claims 6 and 7, even if the sheet body with the titanium metal piece or the titanium metal piece built-in type X-ray film body is used, for example, the user separately provides such a sheet. If you prepare a body, you can easily attach it by sticking it together with the sheet-shaped base material. Therefore, existing X-ray film bodies including those for dentistry can also be supported, even during X-ray photography. There is provided a reference metal piece-attached sheet body having a titanium metal piece for the X-ray film image blackening degree reference which is convenient for use and can be used in combination. The X-ray imaging apparatus according to claim 8 has a film fixing device, and the X-ray film body according to any one of claims 2 to 5 is combined with the film fixing device, or the sixth or sixth aspect. Titanium metal pieces during X-ray photography of bone according to either aspect of combining the sheet body with a metal piece for reference of No. 7 or incorporating a plurality of titanium metal pieces for X-ray film image blackening degree reference having different thicknesses. You can shoot at the same time.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. One embodiment of the present invention uses a dental X-ray film body to which a reference titanium metal piece-attached sheet body, an example of which is shown in FIGS. 1 to 3, is used. Titanium metal is photographed at the same time, and the density of bone is measured by comparing the degree of darkening of titanium with the degree of darkening of bone. In order to be able to measure the density of bone quality by X-ray photography at the time of dental treatment, it is possible to quantify the measurement of density of bone quality based on the degree of blackening according to the thickness of the titanium metal piece.

Referring to FIGS. 1 and 2, as a practical example, an example of a sheet body with a titanium metal piece for reference and an example of an arrangement mode including the state of the thickness of each titanium metal piece are shown. Further, FIG. 3 shows an example of a standard dental dental film, which is a standard dental film. In the figure, 1 is a sheet body with a metal piece for reference, 2 is a transparent mount as a sheet-like base material (for a dental standard type film), 3 is an X-ray film image blackening made of pure titanium metal and having different thicknesses The reference numeral 5 is a titanium piece for reference, the numeral 5 is a dental X-ray film body, and the numeral 6 is a dental standard type film storage body. The dental X-ray film body 5 is composed of a flat bag-shaped dental film container 6 and a dental film f housed therein.

As shown in FIGS. 1 and 2, a sheet body 1 with a reference metal piece is a transparent mount 2 which is a sheet-shaped mount material.
And a plurality of X-ray film image blackening degree reference titanium pieces 3 having different thicknesses, which are integrally attached to the transparent mount 2 so as to be sequentially arranged in the order of thickness.
The thickness of each titanium piece 3 is set to a predetermined thickness. Such a reference titanium metal piece-attached sheet body 1 is
It can be used by being attached to a part of a dental X-ray film container.

Here, the titanium pieces 3 are, for example, circular ones each having a diameter φ of 4 mm and a thickness of 0.3.
It has six thicknesses from mm to 1.3 mm. These thickness 0.3mm, 0.5mm, 0.7m
A sheet body 1 is prepared by adhering titanium pieces 3 of m, 0.9 mm, 1.1 mm, and 1.3 mm to a transparent mount 2 having extremely small X-ray absorption as shown in FIGS. 1 and 2. Has been done. The mount 2 of the reference titanium metal piece-attached sheet body 1 is in use, as shown in FIG. 3, along a part of the film storage body 6 of the dental X-ray film body 5, for example, along the longitudinal direction in the drawing. In this state, attach it to the surface of one of the peripheral edges and take a picture. In the illustrated example, the size of the mount 2 is L1 =
33 mm and L2 = 7 mm, and the size of the film container 6 is L3 = 44 mm and L4 = 34 mm.

The space on each end of the mount 2 in the longitudinal direction is, for example, L1a = 2 mm, and the space between the titanium pieces 3 is L1b = 1 mm. Further, each space in the lateral direction on the mount 2 has, for example, L2a on one side.
= 1 mm and L2b = 2 mm on the other side. In addition, in FIG. 1 and FIG. 2, the thickest titanium piece (1.3 mm) is arranged on the leftmost side in the drawing, and the thin titanium pieces are successively arranged on the right side. Is. When the sheet body 1 is attached to the film storage body 6 when the sheet body 1 is attached in the direction as shown in FIG. 3, the titanium piece row is brought closer to the long side edge portion of the film storage body. An X-ray image of each titanium piece 3 on the X-ray film obtained by X-ray photography is also obtained in such an arrangement and positional relationship, and six circular X-ray images are arranged at predetermined intervals. Becomes

In this way, by using pure titanium metal having a larger X-ray absorption coefficient than aluminum as a reference when measuring the density of bone matter during dental treatment, it becomes possible to make it into a small shape, and it is easy to insert it into the oral cavity. Is. The above-mentioned titanium piece 3 is circular and round, and is desirable to be placed in the oral cavity without corners. It is thin and convenient to use, and even with a limited size film for dental use,
The X-ray image of the tissue around the root of the tooth and the jawbone, which is the original object to be imaged, can be prevented.

Further, in the case of a small dental X-ray film, as shown in FIGS. 4 to 6, the titanium pieces 3 are similarly circular with a diameter φ of 4 mm, for example, a thickness of 0.4 mm to 1 mm. 4 types up to 0.0mm, ie 0.4m thick
m, 0.6 mm, 0.8 mm, 1.0 mm of each titanium piece 3, and a transparent mount 12 with extremely small X-ray absorption
Then, the mount 12 can be attached to the small dental X-ray film container 16 of the X-ray film body 5 for photographing.

In this example, the size of the mount 12 in the sheet body 1 is L11 = 23 mm, L12 = 7 mm,
The size of the film storage body 16 is L14 = 25 mm, L1
5 = 41 mm. The spaces on both sides of the mount 12 in the longitudinal direction, the intervals between the titanium pieces 3, and the spaces on the mount 12 in the lateral direction are the same as those described above, and L11a = 2 mm and L11b = 1 mm. , L12a
= 1 mm and L12b = 2 mm. Also here
4 and 5, the thickest titanium piece (1.
0 mm) is placed on the far right side of the page,
The layout is such that titanium pieces with thinner thickness continue to the left. Sheet body 1 with titanium metal piece for reference in this case
Is attached to the peripheral surface along the short side direction of the film container 16 as shown in FIG. The former large-sized standard type is for adults and the latter small-sized type is for dwarfs, and they can be placed in the oral cavity of a patient and used for dental radiography.

As described above, the reference titanium metal piece-attached sheet body 1 is the existing dental X-ray film formed by the X-ray film f and the flat bag-shaped dental film storage body 6 (16) for storing the X-ray film f. The body 5 is also applicable, and the user prepares such a sheet body 1 and easily attaches it to the dental X-ray film body 5 by pasting it together with the mount 2 (12) and use it for X-ray photography. For example, when the X-ray is taken, the titanium pieces 3 are also taken at the same time. Therefore, this is a sheet body with a titanium metal piece for X-ray film image blackness standard which is convenient for use and can be easily combined and used during X-ray photography.

The sheet body 1 with the titanium metal piece for reference may be provided to the user side together with the dental film storage body, for example, as an X-ray imaging auxiliary material.
Alternatively, only the reference titanium metal piece-attached sheet body 1 may be provided to the user side from another manufacturer and used.

As described above, at the time of X-ray photography, the titanium piece 3 is photographed at the same time, and the X-ray image of the titanium piece 3 is blackened based on the obtained X-ray film image. It is used to measure the density of bone quality by comparing the degree of darkening and the degree of blackening of the image of the jawbone. That is, from the film f obtained by photographing in this way, the blackening degree of the one that has passed through the titanium piece 3 and the one that has passed through the bone substance can be numerically read by a blackening degree measuring device (Densitometer). Therefore, it is easy to compare the blackening degree.

In the case of FIG. 3 of the present embodiment, the titanium pieces 3 have six kinds of thicknesses from 0.3 mm to 1.3 mm, but the degree of blackening of the bone is For example, in order to make it possible to grasp the density of the bone material depending on which thickness of the titanium pieces having a thickness in the range of 0.3 mm to 1.3 mm approximates that, it is necessary to make the determination. The aim is to absorb differences such as imaging conditions, eliminate their effects, reduce the time and effort required for correction calculations, etc., and realize quantification of sparse and dense measurement of bone quality.

This will be described below. FIG. 7 shows an example of characteristics used for the measurement of sparse and dense bone quality in the case of X-ray imaging as described above, and FIG. 8 is a diagram showing an example of measurement points on the obtained film f. is there. The determination of the degree of blackening of the titanium pieces and the densification of bone quality were made experimentally, and the measurement data are shown in FIG. 7. In FIG. 7, the horizontal axis represents the thickness (tmm) of the titanium (Ti) piece, and the vertical axis represents Density, which corresponds to the reading value of the densitometer.

In FIG. 7, it can be seen that as the thickness of the titanium piece increases, the X-ray transmission amount decreases and the degree of blackening increases. For example, if the blackening degree is equivalent to that of titanium pieces having a thickness of 0.9 mm to 1.3 mm,
Based on the experimental data obtained so far, the bone quality is judged to be compact and good. Further, when the blackening degree is equivalent to the blackening degree of the titanium piece having a thickness of 0.3 mm, it can be understood that the bone quality is rough and it is not suitable for implant medical treatment. In this way, the quality of bone quality is determined depending on which titanium piece the degree of blackening of bone quality is close to.

In this embodiment, the numerical values of the respective thicknesses set are the targets of the quantitative evaluation of the sparse and dense measurement of bone quality. For example, in the case of FIGS. 1 and 2, such a thickness of 0.3 mm is used. The range from 1 to 1.3 mm is based on the experimental measurement data by the present inventor as described above. That is, as the thickness of the titanium piece 3 to be used, which is to be attached to the reference metal piece-attached sheet body 1, in this preferred example for dentistry, the thickness is selected within such a range. However, it is not limited to this. As shown in FIG. 7, as a characteristic tendency, the curve of the degree of blackening (D) corresponding to the X-ray amount transmitted through the titanium piece is about titanium piece thickness 1.3 m.
When m is exceeded, there is a tendency that the D value does not change as much as the difference in thickness, so cutting is performed. That is, in the reference metal piece-attached sheet body 1, as a practical upper limit of the titanium piece thickness to be set, a thickness in the vicinity thereof is sufficient. On the other hand, in the case of 0.3 mm or less, since the bone is too rough to withstand use, the quantified evaluation of the sparse / dense measurement is less significant here as a rule, and is therefore unnecessary, so that it can be used as a reference. In the sheet body 1 with metal pieces, the thickness in the vicinity is sufficient as the practical lower limit of the titanium piece thickness to be set.

Here, the basic procedure will be described. This can be as shown in FIGS. 9A, 9B, and 9C, and the following procedure / work is performed. You can proceed with. First, the degree of black and white drawn through a titanium piece having a known thickness t (measured value D by a densitometer) is made into a curve. For example, as shown in FIG. 6A, the measured D value of each X-ray image on the developed X-ray film (negative) corresponding to each part of titanium thickness t1, t2, t3, t4, t5 and t6 is obtained. As a result, the value D (t1),
If D (t2), D (t3), D (t4), D (t5) and D (t6), then points p1, p2, p3 corresponding to the above-mentioned titanium thickness t and the measured value D, respectively. P4, p5 and p6 are plotted on a t-D graph paper, and based on the plots, they are characterized as shown in FIG. (b) to obtain a blackness curve of titanium. From the above, in principle, the larger the data (the number of plots) of the value D corresponding to the known titanium thickness t, the more accurate and detailed the characterization can be made. Ok, because of this,
When the quantification is performed in the next procedure, the accuracy is increased accordingly, but on the other hand, the number of types of the thickness t to be used is increased. Depending on the application, it may be desirable to make the shape as small as possible for dentistry because of its nature, so what kind of thickness t should be used in any range of thickness t. Do you
It may be practical to make the decision in consideration of the two aspects of the former aspect and the latter aspect. In the case of reshaping, it is also possible to relatively emphasize the former aspect.

Next, the required place on the film is measured to obtain its D value as shown in FIG. Here, as shown in the figure, a case where the value 1.5 is obtained as the measurement reading value D of the search target portion is shown. If the D value of 1.5 is measured in this way, the point P where the curve intersects the D value and the curve is found on the graph, and the titanium thickness t value corresponding to the point P is determined. Can be read from the horizontal axis of the graph. That is, for example, a perpendicular line is drawn downward from the intersection point P, and the value t (x) of the point where the foot of the line intersects the horizontal axis of the graph (thickness of titanium) is obtained, which is comparable to the D value at the search location. It becomes the thickness value of titanium.
The value t (x) of the thickness of the obtained titanium was measured by Har.
It is used to determine the degree of coarseness / denseness of the bone depending on which of the areas classified as d, Media, and Soft.

In FIG. 7, specifically, regarding Hardness (H), Mediam (M), and Sof regarding densification of bone quality.
t (S), and further divided into a and b, respectively. These have the following contents, respectively. Hard (H) a, b; Dense bone Dense to large amount of bone mineral Media (M) a, b; Medium Medium compactness (however, the lower part of Mediam (Mb) needs attention when using) Soft (S ) A, b; Bone that has lost its porosity and rigidity (in particular, Sb is not suitable for implants, and the condition of the bone around the root is Soft suggests that the root is unstable. In this way, the clinical rank is classified into H, M, and S (Fig. 7).
In the curve shown, the D value of about 1.35 to 2.00 is Me.
Suppose it falls in the diam category).

Further, referring to FIG. 8, a specific example will be described.
It becomes as follows. Now, it is assumed that it is desired to grasp the state of the bone quality at the measurement points X5 and Y-2 in FIG. 8 in the X-ray film obtained by photographing. in this case,
Since each of the titanium pieces 3 on the reference titanium metal piece-attached sheet body 1 is also photographed at the same time, the titanium thickness value comparable to the D value at the search location may be obtained in accordance with the procedure described above. That is, the degree of blackening of the section (section) of X5, Y-2 is read by the degree of darkness measuring instrument, and based on the Density curve of titanium metal, it is the closest to the reading of the section of X5, Y-2. It is necessary to know the thickness of the corresponding titanium piece which will be an X-ray image of the titanium piece showing the degree of blackening. For example, in the above X
5, the blackening degree of the portion Y-2, if the D value of the portion of the measurement portion in FIG. The concentration of
Even with respect to the bone quality, even if all the conditions are the same, different values are shown due to the difference in the X-ray irradiation dose and the like as described above. Therefore, the evaluation value is obtained by converting the thickness of the titanium piece corresponding to the blackening degree of the titanium piece. Thus, in the curve of FIG. 7, the titanium piece thickness is 0.8 mm.
Is the rank of bone density Hard, Media, Soft
Among them, it is the upper side of Media, and thus, the plurality of titanium pieces 3 having different thicknesses are simultaneously radiographed, and the degree of blackening of the bone quality is similar to that of any titanium piece. Whether the bone quality is good or not can be appropriately determined depending on whether or not the bone quality is high.

According to this method, there is no difficulty in inserting it into the oral cavity as in the case of using an aluminum piece, and a complicated calculation for correcting the measurement error due to the influence of the scattered rays described above is performed. It is not difficult to use as a clinical operation. Furthermore, since the titanium piece is thinner than the aluminum piece when the X-ray is photographed, the scattering effect of the X-ray in the titanium is small, and an appropriate degree of blackening can be obtained. However, since it is not easily physically damaged, it is possible to perform heat sterilization or gas sterilization, and there is also an advantage that it can be repeatedly used.

The avoidance of the influence due to the difference of the photographing conditions can be explained as follows. In the reference example of FIG. 10, the thickness of titanium Ti is 1.3 mm to 0.3 m.
Step of Ti piece that gradually shifts to the range of m, or
The characteristic of the blackening degree of the image drawn on the film by the X-ray transmitted through the Perett of the Ti piece draws a curve in which the lower part bends to the upper right and the lower left (the curve C1 in the same figure). here,
On the film, select the part to be checked from the 4 mm ² section, and when the position is determined as X1 and Y1 as shown in FIG. 11, measure the transmitted light at that position (Densi).
ty measurement) and when Density obtained a value of 1.5, the thickness of Ti corresponds to 0.8 mm (C1 curve).
As described above, this is the titanium piece thickness conversion evaluation value, and the evaluation value is 0.8 mm. On the other hand, depending on conditions such as shooting, even a film of the same body sometimes has a curve of C2. In that case, conversely, a Density corresponding to Ti 0.8 mm can obtain a D value of 1.8 by measurement. In other words, the final numerical values can cover some differences in the X-ray direction and the development conditions.

The reference examples of FIGS. 12 and 13 show examples in the case of tracking change in the same patient after 6 months. The Ti curves in the cases of 6 months before and 6 months after are different like the curves a and b, and even at the same site, as shown in FIG. 13, the first position (X1, Y1) of the position (X1, Y1) The obtained D value was 1.37, and even if the D value after 6 months in the same part was different from 1.16, when viewed as conversion evaluation values, they were both 0 as shown in FIG. It is 0.8 mm. Therefore, in this case, it can be determined that there is no change, and the follow-up can be appropriately performed.

With respect to the measurement points on the X-ray film in the case of determining the density of bones, it is possible to adopt two methods, that is, the measurement by the whole section and the measurement by the specific section. The specific section measurement is suitable when determining the degree of coarseness or denseness of bones at a specific site, or when tracking the secular change of the same patient. This is as described above. The total parcel measurement adds up the numerical values obtained from all parcels of the image,
This is a method of displaying the simple average.

FIG. 14 shows an example of this method. For example, all the sections on the film of FIG.
The D value is measured for each section from the entire area with the line image appearing, and the total average D value is calculated as (total value of D values for each section) ÷ (number of the section for which the D value was measured). ) Ask for. The measured D value for each section is shown in FIG. 11 and FIG.
It is convenient to calculate the total value, etc. if you write it on the paper of the prescribed format like 3 each time, and it is easy to collate it when you re-inspect it later, and it is recorded as it is with the prescribed record items. I can leave.

Now, the total average D of all the areas measured in this way
If the value is calculated and obtained as 1.8, it is 0.5 mm when converted to titanium thickness in FIG.
Titanium thickness. The determination in this case is M
The area is from b to Sa (see FIG. 7), and is considerably sparse.

The titanium thickness of 0.5 mm is the minimum D.
It is deviated to the value, and it is judged that it tends to become sparse as a whole in the future. The maximum to minimum D value is 1.0 mm to 0.4 m in terms of titanium thickness in the bone condition in this case.
It indicates that the particles are dispersed at a sparse density corresponding to m. As described above, depending on the position where the numerical value corresponding to the titanium thickness of the value obtained by dividing the total of the D values picked up from all the target areas by the number of the picked up sections is biased to the upper limit or the lower limit, It is also possible to determine the tendency of. The method can be used in this way.

The method of setting the titanium pieces for the purpose of reproducing the standard blackening degree as an image on the X-ray film can be as follows. It is a method of removably attaching to the outside of the film pack, fixing and shooting, and a method of repeatedly using titanium pieces. It's built into the pack of film itself so that you don't have to attach a piece of titanium every time you shoot. Still another method is to use a fixing device for the film itself to photograph under the same condition, and a titanium piece is fixed to a part of the fixing device used for standard photographing. In either case, simultaneous shooting of titanium metal can be easily performed.

The above is an example of one of these, in which a separate sheet member 1 with a titanium metal piece for reference is attached to the surface of the film container of the dental X-ray film unit 5 when necessary. However, the present invention is not limited to this and may be as follows. That is, it is an X-ray film body composed of an X-ray film and a film housing body for housing the X-ray film, and a plurality of titanium metal pieces having different thicknesses are provided in a part of the film housing body. , An X-ray film body with a titanium metal piece in which the thickness of each titanium metal piece is set to a predetermined thickness, or a part of the X-ray film in the film container or a part of the inner surface of the film container. May be a plurality of titanium metal pieces having different thicknesses, and the thickness of each titanium metal piece is set to a predetermined thickness. In the same manner as described above, a plurality of titanium metal pieces are attached to the film container or the X-ray film or the inner surface of the film container through the sheet-shaped base material integrally attached thereto. It may be X-ray film body is attached. Even with such an X-ray film body, when quantitatively measuring the density of bone substance, it is possible to easily perform simultaneous imaging of titanium metal pieces, which is suitable for easily and appropriately performing this, and in this case, in advance, Since the titanium metal pieces have been added in advance,
There is an advantage that it is possible to save the time and effort for attaching separate reference titanium metal piece-attached sheet bodies, and from this point, such a mode is desirable.

FIG. 15 and FIG. 16 show an example of a dental X-ray film body containing a titanium metal piece. As shown in the figure, in each of the examples, the reference titanium metal piece-attached sheet body 1 previously described is built in the film storage body 6 or the film storage body 16 of the dental X-ray film body 5. , Provided to the user in this state.

By using the titanium piece 3 having a large X-ray absorption coefficient as a reference for measuring the density of bone during dental treatment, it is possible to easily insert it into the oral cavity with a small shape, and the appearance is the same as before. It is equivalent to the dental X-ray film body described above, can be handled in the same manner, is convenient, and has the advantage that simultaneous X-ray photography can achieve simultaneous photography of the titanium pieces 3. Further, in this built-in type, even if a plurality of titanium pieces are used, it is possible to prevent one or more titanium metal pieces from being accidentally detached during handling or the like. As a result, quantitative measurement of the density of the bone substance is ensured without missing any X-ray images of the titanium pieces 3 having different thicknesses. From this point, such an aspect is desirable. The present invention may be implemented in this manner.

17 to 24 show an example of the above method. In this example, a device for X-raying the tissues around the root of the tooth and the jawbone by irradiating X-rays is provided with a film fixing device for holding the dental film in the oral cavity on the tooth profile cover, and is connected to the film fixing device. Attach a plate so that it can be displaced outside the oral cavity, and
Titanium pieces of different thickness are attached to the film fixing device of the oral X-ray standard photographing apparatus configured to serve as a guide for setting the irradiation direction and irradiation distance of X-rays from the main body of the X-ray photographing apparatus, and simultaneous photographing of titanium pieces is performed. It is the one that is going to be realized.

FIG. 17 shows the overall structure of the apparatus. 1 in the figure
Reference numeral 01 denotes an X-ray imaging apparatus main body, 102 denotes an X-ray imaging apparatus cone portion, and the X-ray generation unit 1 in the X-ray imaging apparatus main body 101.
By irradiating the X-ray from 21 to the predetermined imaging region of the patient via the cone portion 102, the X-ray imaging at the time of dental treatment is performed. At the time of this photographing, a photographing assisting device incorporating a plurality of titanium pieces 3 having different thicknesses (see FIG. 20) is used. This auxiliary device includes, for example, a tooth profile cover 150 (a cover for the lower jaw in the figure) for the patient, which is created in advance according to the upper jaw teeth and the lower jaw teeth of the patient to be imaged, and a tooth root periphery to be imaged. An intraoral film fixing device 103 to be placed in the oral cavity, which is attached to a corresponding position on the tooth profile cover 150 at a position corresponding to the tissue and the jawbone.
, U-shaped arm attachment 104, and U-shaped arm 1
05 and an extraoral parallel plate 106.

The tooth-shaped cover 150 is made of plastic and does not require the accuracy required for dentures. For example, it is a mouthpiece-like member and can be stably attached to the tooth of a patient. I wish I had it. The intraoral film fixing device 103 is integrally fixed to the tooth-shaped cover 150 with an adhesive, and this can be prepared as an auxiliary tool for each patient. On the other hand, the U-shaped arm attachment 104, the U-shaped arm 105, and the extraoral parallel plate 106 are common auxiliary tools that can be assembled and used with the above-mentioned auxiliary tools.

The intraoral film fixing device 103 is used to fix the X-ray film f, and the dental film container 107 having the X-ray film f accommodated therein is inserted into the rear end portion of the fixing device 103. It has a holder 131 for holding it. Here, the film storage body 107 does not have to be the titanium built-in type described above, and the sheet body 1 described above may not be attached. The film storage body 107 is
The existing ones can be used as they are. At the time of use, the X-ray film f is positioned behind the photographing region (inside the oral cavity) by the holder 131 by inserting the film storage body 107 in a state where its tilted state is restricted.

The U-shaped arm attachment 1 of the above-mentioned common auxiliary tool is attached to the front end of the intraoral film fixing device 103.
04 is attached (see FIG. 18). Therefore, at the time of use, as shown in FIG. 17 to FIG.
6 is its attachment 104 and U-shaped arm 105.
It is connected to the film fixing device 103 via the. Further, in FIG. 17, a light source device 108 is provided on the side of the imaging device main body 101, a plurality of optical fiber cables 109 are led out from the light source device 108, and the ends thereof are brought to the periphery of the cone portion 102, so that the periphery of the cone portion is surrounded. Each tip fixing portion 122 arranged so as to be located on a predetermined circle
(Only one is shown in FIG. 17).

The blackness reference titanium piece 3 can be attached to such a film fixing device 103. Here, for example, the titanium piece holder 1 as shown in FIG. 20A.
32, each of the circular recesses 132a for holding the same has a thickness t.
17 and 18 are inserted into the respective titanium pieces 3 having different circular shapes (in the illustrated example, there are four kinds of thickness).
As described above, the film fixing device 103 is attached so as to be embedded in the upper surface portion thereof. The thickness t direction is the front-back direction of the film fixing device.

In the present apparatus, with the tooth profile cover 150 removed from the teeth, the bisector plane F2 between the X-ray film plane Ff and the plane perpendicular to the long axis center of the tooth and the surrounding tissue F1 as shown in FIG. 24 is formed. On the other hand, the parallel plate 106 is set to the intraoral film fixing device 103 so as to be parallel to this, and the tooth profile cover 150 is fitted to the tooth at the time of actual photographing, and the X-axis is perpendicular to the extraoral parallel plate 106. The position of the X-ray imaging apparatus main body 101 is to be determined so that a ray is incident. As shown in FIGS. 17 and 18, and FIG. 19, the tooth profile cover 50 is provided.
The U-shaped arm attachment 104 is inserted into the intraoral film fixing device 103 integrally provided on the above, and one end of the arm 105 is connected to the attachment 104 and guided to the outside of the mouth. Board 106
This extra-oral parallel plate 1 is attached when shooting.
Position 06 outside the patient's mouth. Therefore,
Conventionally, there is no guideline for positioning outside the patient's oral cavity even when an image is to be captured according to the bisection method, whereas the extraoral parallel plate 106 having the above-described configuration is used. By providing, it can be used as a guide for positioning. That is, the extraoral parallel plate 106 always sets the X-ray irradiation direction to a constant angle with respect to the dental film f fixed in the patient's mouth through the tooth profile cover 150 and the film fixing device 103,
And the outer skin of the mouth that serves as a guide for determining that the distance is also substantially constant.

The bisection method will be described below.
FIG. 24 shows X-rays of a desired tooth peripheral tissue portion in dental treatment.
When taking a radiograph, a dental film is placed behind the site (in the oral cavity), and an X-ray is irradiated by an X-ray radiographing apparatus on the front side of the patient, and an oral X-ray is obtained when a film image is obtained by radiography. 1 schematically shows a method called a halving method as an imaging method relating to an X-ray irradiation angle in imaging.

As shown in the drawing, the X-ray film f is made substantially parallel to the tooth and its surrounding tissues as shown by the solid line in the back, depending on individual differences, even if the imaged region is on the back tooth side or the same region. It may not be positioned and may be in a tilted state as shown by the broken line (the lower jaw side is symmetrical in the case of the figure). Bisecting plane F2 between Ff and a plane F1 perpendicular to the long axis center of the tooth and its surrounding tissue (tooth supporting tissue)
Is used as a reference at the time of photographing regardless of the inclination of the X-ray film f, and the X-ray irradiation (irradiation center line) is the reference plane (F
This is a method of setting the irradiation direction so as to be perpendicular to 2).

As shown in FIG. 5b, when the X-ray irradiation center is perpendicular to the long-axis center vertical plane F1, the image is taken in a state in which the target tooth and the surrounding tissue are always facing each other. Although it can be done, the image on the film surface obtained in this case becomes a photograph in which the lower image portion has a larger elongation as the X-ray film f is greatly inclined (for example, if attention is paid to the specific portion point P ₁ , This will be reflected on Pb on the film surface as shown). On the other hand, the film surface Ff is used as a reference and is always perpendicular to the film surface Ff.
When the image is taken as shown in, the larger the inclination of the X-ray film f, the more basically the obtained film image tends to shrink (the point P ₁ appears on the film surface Pc).

Considering the case where the X-ray film f is inclined and placed in the oral cavity as described above, the direction of X-ray irradiation is important. It becomes an intermediate film image (for example, point P ₁ appears in Pa on the film surface). That is, even in the case where the X-ray film f has a large inclination, there is no extreme elongation or contraction, and the tendency is not biased to any tendency. This is a feature of the method (note that the X-ray film f
As for the part which can be positioned in the parallel or substantially parallel state, the bisector plane F2 is substantially parallel to the actual film plane Ff and the major axis center vertical plane F1 as a result. Thus you will get the same film image that was taken in the face-to-face condition).

For this reason, in X-ray photography at the time of dental treatment, particularly, the same location as that photographed in the past for the same person is photographed again and the change in the size of a specific portion in the previous film image is compared and compared. In the case of X-ray photography in which the patient is to be used for diagnostic purposes, this bisection method is used to divide the intraoral X-ray film and the plane perpendicular to the long axis center of the tooth and the tissue around the tooth. It is said that it is preferable to take an image with the X-ray irradiation center line being perpendicular to the line surface. However, since it is extremely troublesome to grasp the bisector of the oral cavity, conventionally, the position to be photographed is visually determined. It is time-consuming and time-consuming to accurately presume the bisector plane in the oral cavity and determine the irradiation direction as shown in FIG. It is very troublesome to take.

In the case of radiography by such positioning by eye measurement, it depends exclusively on the skill of the operator, and in deciding the position of the X-ray radiographing apparatus for each patient at the time of the radiography, Since no special measure is used, it is difficult to obtain a film image with high accuracy by this method even if it is intended to shoot by the bisector method. Especially when photographing the same part of the same person at different times, positioning by visual measurement
It is extremely difficult to take a picture by reproducing the same conditions as the X-ray irradiation angle and the irradiation distance as in the previous shooting.

On the other hand, in this apparatus, the extraoral parallel plate 106 serves as a guide. The extraoral parallel plate 106, which is a part of the common auxiliary tool, can be maintained parallel to the bisector plane F2 (FIG. 24, FIG. 21) even if the bisector F2 (FIG. 24, FIG. 21) changes depending on the imaging site or the like. Thus, it is preferable that the mounting angle can be adjusted.

Now, assembling the tooth-shaped cover 150 and the intraoral film fixing device 103, which are auxiliary tools for individual patients, and the U-shaped arm attachment 104 (arm attachment attachment) as shown in FIG. 18 has two pins 141 and 141 as shown in FIGS. 18 and 19 on the side of the attachment 104, and as shown in FIG. 18, two pin insertion holes 133 and 133 are formed on the facing surface of the film fixing device 103. However, these can be attached and detached.

The film fixing device 103 provided with the titanium pieces 3 having different thicknesses is to be fixed by adhesion on the corresponding tooth profile cover 150 corresponding to the tissue around the tooth root and the jawbone to be imaged by the patient. When there are a plurality of parts to be imaged, a plurality of film fixing devices 103 (for example, about 2 to 5 parts) can be attached to one tooth profile cover 150.

Tooth profile cover 1 created in advance for the patient
As the above-mentioned intraoral film fixing device 103 itself to be attached and fixed to 50, if the types in which the angle α of the rear film holder 131 as shown in FIG. 18 is different are prepared, the position to be attached (hence, (Image part)
A desired holder angle can be fixed to the tooth profile cover 150 depending on the patient's individual angle. Regarding the angle α, for example, for α = 5 ° (for a portion where the X-ray film f can be arranged so as to be in a state substantially parallel to the longitudinal axis center vertical plane F1 of the tooth and the surrounding tissue as shown in FIG. 24). ), For α = 15 °, α = 30 °
It is sufficient for practical use if about 3 kinds of items for use are prepared in advance. The intraoral film fixing device 103 is fixed at a predetermined position of the patient's dental mold cover 150 created in advance in this way, and is stored integrally with the patient's dental mold cover 150. Then, during use (at the time of X-ray photography), the U-shaped arm attachment 1 in the state as shown in FIG.
Used in combination with 04 side.

The structure of the U-shaped arm 5 is, for example, a combination of three arms A, B and C as shown in FIG.
Arm A whose one end side is supported by the attachment 104
Is connected to an intermediate arm B, and the arm B is connected to an arm C to which an extraoral parallel plate 106 is attached. The arm B is slidable in the left-right direction in the figure with respect to the arm A (arrow h), and the arm C is vertically slidable in the figure with respect to the arm B (arrow i) and rotated. It is also possible (arrow j). Further, the arm A is rotatably attached (arrow k) with respect to the attachment 104. With the attachment 104 attached to the intraoral film fixing device 103, the position of the extraoral parallel plate 106 can be adjusted back and forth by sliding between the arm A and the arm B, and the interval adjustment scale 111 used for adjustment in that case is an arm. It is attached to A. Also, arm B
Depending on the slide between the arm and arm C, the extraoral parallel plate 10
As a result of the expansion and contraction of the arm C to which 6 is attached, the position of the extraoral parallel plate 106 can be adjusted along the direction (mesiodistal direction). For this case, the arm C is provided with the extraoral parallel plate expansion and contraction scale 112. Has been done.

Further, by rotating the arm C with respect to the arm B, the angle of the plate surface of the extraoral parallel plate 106 can be adjusted. An extraoral parallel plate mounting angle scale 113 in this case is attached to the arm B. Further, when the arm A is rotated with respect to the attachment 104, the entire U-shaped arm 105 can be rotated. An angle scale 114 for the entire rotation in this case is attached to the support side of the arm A.

The angle adjustment is practically sufficient only by adjusting the angle of the extraoral parallel plate 106 by the rotation of the arm C in a range where the inclination angle (α) of the X-ray film surface is small. However, as the angle α of the film holder 131 that restricts the installation state of the X-ray film f increases, as shown in FIG.
2 also tilts, so that the parallel plate 106 outside the oral cavity is moved only by turning the arm C so as to be parallel to the bisector F2.
When photographing is performed with the angle adjusted to the state of 06b (dashed-dotted line), the irradiation center line of X-rays perpendicular to the extraoral parallel plate 106b in that case is a2, compared to the case where the X-ray irradiation center line is a1. There will be a gap. On the other hand, by adjusting the rotation of the arm A, the entire U-shaped arm 105 including the extraoral parallel plate 106 can be moved in the vertical direction, so that the extraoral parallel plate 106 is indicated by a broken line 106a. It can be made parallel to the bisector F2 when moved downward. Therefore, the extraoral parallel plate 10 in that case
6a as an aiming point and an irradiation center line a1 (that is,
If X-ray irradiation is performed with (perpendicular to the bisector plane F2), the above-mentioned deviation can be alleviated, finer adjustment can be performed, and versatility as a common auxiliary tool can be further enhanced. It is possible.

The scales 111, 112 of the adjusting elements described above,
If the necessary readings are attached to the reference numerals 113 and 114 with reference to a specific adjustment position (for example, 0 scale), the readings are recorded in the chart of the patient when the desired adjustment state is achieved. This makes it possible to easily reproduce the same condition based on the recording even when the same portion is repeatedly photographed at a later date.

In this way, the U-shaped arm 105 can easily change the distance and direction between the extraoral parallel plate 106 and the bisector F2 in a clinical setting. Although there are individual differences in the shape of the oral cavity, this common auxiliary tool can achieve the necessary necessary adjustments even for such individual differences in patients, and in addition, there are scales such as angle and distance, It can also be applied to the shape of the oral cavity. Therefore, in relation to the intraoral film fixing device 103 mounted through the tooth profile cover 150 of the patient and having the titanium pieces 3 attached thereto as shown in FIG. The extraoral parallel plate 106 connected by 105 can be three-dimensionally varied over each element of angle, front and back, up and down, and left and right (mesiodistal direction) as needed in a clinical setting. The degree of relative adjustment between the device 103 and the extraoral parallel plate 106 can be confirmed by a scale.

The structure of the extraoral parallel plate 106 is shown in FIG.
Since X-rays are irradiated as indicated by the alternate long and short dash line in FIG. 7, a thin plate-like material made of a material that easily transmits X-rays (extremely small X-ray absorption) does not interfere with photographing. Similarly, the arm 105, the attachment 104, and the film fixing device 10 that are to be in the X-ray irradiation range.
3, the holder 131 part is also made of a material that easily transmits X-rays, and when the titanium piece holder 132 is used, this is also X-ray.
It is made of a material with extremely small line absorption. By doing so, titanium pieces X having different thicknesses for reference to the degree of blackening can be obtained.
The line image is also captured well on the film f.

Further, as shown in FIG. 22, a circle 161 having a predetermined diameter is drawn on the center of the surface of the plate opposite to the X-ray imaging apparatus side of the parallel plate 106 outside the oral cavity. ,
Optical fiber cable 10 on the X-ray imaging apparatus main body 101 side
The visible light from 9 is emitted. Figure 2
3A and 3B are views showing an example of attachment of the optical fiber cable 109. The cone unit 2 is composed of an X-ray imaging apparatus cone 123 and an X-ray imaging apparatus outer cone 124, and the tips of the optical fiber cables 109 branched from the light source apparatus 108 are fixed between the cones. The fixed portions 122a to 122d are
They are arranged at 90 ° intervals on the circumference of a predetermined diameter centered on the cone center axis (A in the figure). In addition, each tip fixing portion 12
2a to 122d are preferably lenses 125a to 125a, respectively.
125d is provided.

In this way, the visible light is guided from the light source device 108 to the cone portion 102 through the four optical fiber cables 109, and the ends thereof are attached to the outer periphery of the cone 122 of the X-ray imaging apparatus 101 in four rows in parallel. A spot visible ray having a diameter of 3 to 5 mm is irradiated from the tip of the optical fiber cable toward the extraoral parallel plate 106 in a state parallel to the X-ray irradiation center line. This means that the X-ray irradiation center line is perpendicular to the extraoral parallel plate 106 at the time of imaging, and the distance to the extraoral parallel plate 106 of the X-ray imaging apparatus main body 101 is always the same distance. 1
This can be confirmed by applying the spot S of the visible light guided by 09 to the plate surface (FIG. 22) of the extraoral parallel plate 106.

Now, in an actual photographing place, as shown in FIG. 17, the photographing assisting device having the assisting tools on each side attached thereto is attached to the patient, and the above-mentioned adjustment of the extraoral parallel plate 106 is performed. When attempting to perform X-ray imaging of a target imaging region in a previously performed state, how to determine the imaging position on the apparatus main body side including the direction of X-ray irradiation can be performed as follows. It should be noted that the adjustment work for parallelizing the extraoral parallel plate 106a at the optimum position with respect to the bisector F2 as shown in FIG. 21 may also be performed accurately once. I'm done. That is, when positioning for shooting,
Four spot visible rays are applied to the vicinity of a circle 161 drawn on the surface of the parallel plate 106 outside the oral cavity, and the position of the X-ray imaging apparatus main body 101 is adjusted so that all four spots S are gathered on the same circumference as shown in FIG. By aligning, the X-ray irradiation center line passes through the center of the circle 161 and becomes perpendicular to the extraoral parallel plate 106 in the used state of FIG. As a result, the bisector F
It is also perpendicular to 2. In this way, the position of the X-ray imaging apparatus main body 101 can be determined with respect to the direction of X-ray irradiation with the extraoral parallel plate 106 as the aim.

The distance between the tip of the cone 102 and the extraoral parallel plate 106 is determined based on the diameter of the spot S on the surface of the extraoral parallel plate 106. The spot diameter when the distance becomes a predetermined size (for example, 7 cm) is set in advance as the target spot diameter, and the X-ray imaging apparatus main body 101 is moved forward and backward with respect to the extraoral parallel plate 106 (see FIG. 17, If the spot diameter is adjusted to the target size by adjusting the position in the front-back direction on the alternate long and short dash line direction), the distance from the tip of the cone portion 102 of the X-ray imaging apparatus to the parallel plate 106 of the oral cavity is almost always previously set. It can be set to a specified value. On the other hand, extraoral parallel plate 1
The distance from 06 to the X-ray film f fixed in the oral cavity of the patient by the holder 131 of the film fixing device 103 is set to a desired value by adjusting the U-shaped arm 105 portion on the side of the imaging auxiliary device. As a result, the distance L based on the X-ray generation source in FIG. 17 is substantially
It can always be set to a predetermined constant value.

In this way, the position of the X-ray imaging apparatus main body 101 can be determined with respect to the X-ray irradiation distance by aiming the extraoral parallel plate 106 as a sight. After positioning as described above, it is sufficient to perform X-ray photography as usual to obtain a film image. Thus, according to this oral X-ray standard photographing apparatus, the X-ray obeying the bisection method is used. Photographing can be appropriately performed, and each titanium piece 3 can also be photographed at the same time.

The present invention can also be carried out in such a system, and by attaching it to a film fixing device intended for standard photographing, it is possible to easily measure the degree of blackening under the same conditions. The procedures such as the determination of the density of the jaw bone based on the X-ray film f obtained by radiography are the same as described above. With this device, it is possible to simultaneously capture multiple pieces of titanium metal with different thicknesses for dental X-ray film image darkness reference, and even when re-imaging the same location, the same conditions (direction and direction) Distance) is guaranteed. Positioning by visual inspection requires considerable skill, or the position tends to be different each time, but such a situation is avoided, and stable and easy shooting with conventional visual measurement is avoided. At the same time as obtaining images with higher accuracy, it is possible to accurately compare and track changes over time in the ecology. Therefore, it is also possible to properly grasp the change in the pathological condition and take an early action. Particularly, it is suitable for the case of tracking changes in the same patient as described in FIG.

Further, according to the present apparatus, it is also advantageous in reducing the amount of X-ray exposure. That is, conventionally, there is no means outside the patient's mouth to serve as a guide, so there is a tendency to set the range of X-ray irradiation to a wide range, while the extraoral parallel plate 106 exists outside the mouth as a guide. Since such a tendency can be suppressed and X-rays can be focused and imaged in the area of the minimum required source, the amount of conventional radiation exposure can be reduced to 1/10 or less.

The present apparatus can be variously modified and modified in addition to the examples described above. For example, the film fixing device 10
When the U-shaped arm 105 is used in the case where the external parallel plate 106 is movably connected to the arm 3, the arm B may be configured to be rotatable with respect to the arm A.
The arm A may be attached to the attachment 104 so as to be slidably adjustable. The flexibility can be further increased by adding such an adjusting element. Further, it is more preferable that the slide adjustment and the rotation adjustment can be performed by a predetermined amount with a click feeling. Also,
After the adjustment, it is desirable to provide a fixing tool for surely preventing the movement so that the adjusted state does not change during use. Further, the titanium pieces 3 having different thicknesses attached to the film fixing device 103 are configured as shown in FIG. 20A, but other configurations may be used.

For example, a plurality of titanium pieces 3 having different thicknesses as shown in the side view and the front view in the upper and lower parts of FIG. 20B.
May be used. In this case, a plurality of titanium pieces having different thicknesses are continuous, and the X-ray image thereof is also obtained as continuous on the film. Further, here, the shape is not a circle but a rectangle. Further, in this example, since a plurality of titanium pieces having different thicknesses are integrated, they may be directly incorporated in the film fixing device 103 without using the holding member as shown in FIG. Further, a mode in which the circular titanium piece 3 as shown in FIG. 7C and the rectangular titanium piece 3 as shown in FIG. 3B are combined may be used, and a plurality of titanium pieces having different thicknesses may be configured by this. . The combination mode is not limited to the above. These examples may be applied to the case of the sheet body of FIGS. 1 to 6 according to the example of the above method or the case of the titanium-containing film container of FIG. 15 or 16 according to the example of the above method.

In the apparatus described in FIGS. 17 to 24, the film container in which the reference titanium piece-attached sheet body is adhered or the reference titanium piece-embedded film container is used as the used film container. Also, it can be used by measuring the degree of blackening at the same time as the standard photographing. In this case, it is not necessary to embed the titanium piece on the film fixing device side. In addition, at the time of use, the reference titanium piece-attached sheet body itself may be attached to an appropriate portion on the film fixing device side, and simultaneous photographing may be performed in that state. Also in this case, the structure in which the titanium piece is embedded in the film fixing device side is not necessary.

The present invention is not limited to the case where the tissue around the roots of the tooth and the jawbone are targeted, and the invention is not limited to the dental use. For example, it can be applied to other cases when determining the density of foot bone quality,
It can be widely applied when it is desired to quantitatively measure the density of bone by comparing the density of bone with the blackening degree of titanium metal. Further, the procedure contents of FIG. 9 may be implemented by a process by a microprocessor so that an evaluation conversion value obtained based on data input can be obtained.

[0075]

According to the present invention, titanium metal can be simultaneously photographed during X-ray photography, and the density of bone can be measured by comparing the degree of blackening of titanium metal with the degree of blackening of bone. The influence on the degree of blackening due to the influence of scattered rays of rays can also be suppressed,
Based on the degree of blackening of the X-ray image portion due to titanium metal, it is possible to measure the bone density satisfactorily with an appropriate degree of blackening. X-ray scattering is minimal, and not only a proper standard blackening degree can be obtained, but titanium metal is also less susceptible to chemical and physical damage, and can be heat disinfected or gas sterilized for repeated use. You can Further, according to the present invention, when quantitatively measuring the density of the bone substance, it is suitable for easily and appropriately performing this, and simultaneous shooting of titanium metal can be easily performed. With a titanium metal piece or with a titanium metal piece built-in type It is also suitable for use when an X-ray film body is obtained and the sparse / dense measurement of bone quality is quantified on the basis of the degree of blackening according to the thickness of a plurality of titanium metal pieces. In particular, for dental use, a pure titanium metal having a large X-ray absorption coefficient is used as an X-ray film body used for grasping the condition of the tissues around the roots of the tooth and the jawbone, and as a reference when measuring the density of bone quality. By doing so, it is possible to make it into a small shape, and it is possible to facilitate insertion into the oral cavity. Further, in the sheet body with a metal piece for reference of the present invention, a plurality of titanium metal pieces having different thicknesses are previously added in advance. Not only that, if you prepare such a sheet body, it can be easily attached by sticking the sheet-shaped base material together, and it is also possible to realize simultaneous X-ray imaging of titanium metal, It is convenient. Therefore, if this is used, existing X-ray film bodies including those for dentistry can be easily dealt with, and can be easily combined for use during X-ray photography. It is possible to provide a sheet body with a titanium metal piece for the standardization degree. Further, even in the case of these X-ray film bodies and sheet bodies with reference metal pieces, the thickness of the plurality of titanium metal pieces can be made smaller than the case where aluminum pieces are used. In addition to the advantage that there is little influence of X-ray scattering in the inside and an appropriate degree of blackening can be obtained, it is also less susceptible to chemical and physical damage, so heat disinfection or gas sterilization is possible and repeated use There is an advantage that it is possible, and the effect is great also in this respect. Further, in the present invention, the application effect is further improved by implementing the invention in combination with a film fixing device capable of standard photographing.

[Brief description of drawings]

FIG. 1 is a view showing an example of a sheet member with a reference titanium metal piece that can be used in the present invention.

FIG. 2 is an explanatory diagram of an example of an arrangement mode including the state of the thickness of each titanium metal piece.

FIG. 3 is a view showing an example of a dental X-ray film body to which a reference titanium metal piece-attached sheet body is attached.

FIG. 4 is a diagram showing another example of a sheet body with a reference titanium metal piece.

FIG. 5 is an explanatory view of an example of an arrangement mode including the state of the thickness of each titanium metal piece.

FIG. 6 is a view showing another example of a dental X-ray film body to which a sheet body with a reference titanium metal piece is attached.

FIG. 7 is a diagram provided for explaining an example of a sparse / dense measurement of bone quality.

FIG. 8 is an enlarged view of an example of film coordinates used for explaining an example of measurement of sparse and dense bone quality.

FIG. 9 is a diagram for explaining an example of a procedure for measuring the density of bone quality.

FIG. 10 is a diagram showing a reference example provided for explaining the measurement of sparse and dense bone quality.

FIG. 11 is a diagram showing an example of a coordinate sheet in that case.

FIG. 12 is a diagram showing another reference example for explaining the measurement of the bone density.

FIG. 13 is a diagram showing an example of a coordinate sheet in that case.

FIG. 14 is a diagram showing still another reference example for explaining the measurement of the density of bone.

FIG. 15 is a view showing an example of a dental X-ray film body having a sheet body with a reference titanium metal piece.

FIG. 16 is a diagram similarly showing another example.

FIG. 17 is a diagram showing an example of an X-ray standard photographing apparatus having a film fixing device provided with a reference titanium metal piece, and is a diagram showing an entire configuration of an example of an oral X-ray standard photographing apparatus.

FIG. 18 is an explanatory view of assembling the parallel plate outside the oral cavity to the intraoral film fixing device portion.

FIG. 19 is a plan view of the attachment, the U-shaped arm, and the extraoral parallel plate portion.

FIG. 20 is a diagram showing an example of applicable titanium metal pieces.

FIG. 21 is a diagram showing an example of adjustment by a U-shaped arm.

FIG. 22 is a diagram showing a specific example of an extraoral parallel plate.

FIG. 23 is an end view (A) and a side view (B) of the cone portion of the X-ray imaging apparatus.

FIG. 24 is a schematic explanatory diagram of a bisection method.

[Explanation of symbols] [Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Sheet body with a metal piece for reference 2 Transparent mount 3 Titanium piece 5 Dental X-ray film body 6 Large dental film storage body 12 Transparent mount 16 Small dental film storage body 101 X-ray imaging device 102 X-ray imaging device cone part 103 Oral film fixing device 104 U-shaped arm attachment 105 U-shaped arm 106 Extraoral parallel plate 108 Light source device 109 Optical fiber cable 111 Spacing adjustment scale 112 Extraoral parallel plate expansion / contraction scale 113 Extraoral parallel plate mounting angle scale 114 U type arm Dynamic scale 122, 122a to 122d Optical fiber cable tip fixing part 123 X-ray imaging device cone 124 X-ray imaging device outer cone 126 Spot visible light irradiation part 127 Light emitting diode 131 Film holder 132 Titanium piece holder 133 p Insertion holes 141 pin 150 tooth cover 161 yen A~C arm S spot f X-ray film F1 teeth and long axis center vertical plane F2 bisector plane of the surrounding tissue

Claims (8)

[Claims] 1. An X-ray image of a bone is taken simultaneously with a titanium metal piece, and the density of bone is measured by comparing the blackening degree of the X-ray image of titanium metal with the blackening degree of the X-ray image of bone. A method for measuring the density of bone material, which is characterized by the following. 2. An X-ray film body comprising an X-ray film and a film container for accommodating the X-ray film, wherein a part of the film container comprises a plurality of titanium metal pieces having different thicknesses. An X-ray film body, wherein the titanium metal pieces are provided and the thickness of each titanium metal piece is set to a predetermined thickness. 3. An X-ray film body comprising an X-ray film and a film container for accommodating the X-ray film, wherein a part of the X-ray film in the film container or an inner surface of the film container. A plurality of titanium metal pieces having different thicknesses are arranged in the portion, and the thickness of each titanium metal piece is set to a predetermined thickness. 4. A plurality of titanium metal pieces are attached to a film container, an X-ray film, or an inner surface of a film container, via a sheet-shaped base material integrally attached to the titanium metal pieces. The X-ray film body according to claim 2 or 3. 5. The X-ray film body according to any one of claims 2 to 4, wherein the X-ray film is a dental X-ray film which is placed in the oral cavity and X-rayed. 6. A sheet body comprising a sheet-shaped base material and a plurality of titanium metal pieces having different thicknesses attached to the sheet-shaped base material for X-ray film image darkness reference titanium sheet. A sheet body with a reference metal piece, wherein the thickness of each titanium metal piece on the flat base material is set to a predetermined thickness. 7. The sheet body according to claim 6, which is used by being attached to a dental X-ray film or a part of a film storage body for the dental X-ray film. 8. A film fixing device is provided, and the X-ray film body according to any one of claims 2 to 5 is combined with the film fixing device, or the film fixing device according to claim 6 or 7. Simultaneous titanium metal pieces during X-ray photography of bone by either combining a sheet body with a reference metal piece or incorporating a plurality of X-ray film image darkening degree reference titanium metal pieces having different thicknesses. An X-ray imaging apparatus characterized by performing imaging.