JP5376367B2 - Radiation shield device - Google Patents

Description

  The present invention relates to a radiation shield device suitable for treatment and examination under CT fluoroscopy.

  Treatment using the technique of interventional radiology (hereinafter referred to as IVR) is increasing year by year.

  The above-mentioned IVR is an application of radiological diagnostic techniques that have been used for diagnosing diseases, for example, while looking at X-ray fluoroscopy images, angiographic images, or ultrasound or CT (Computed Tomography) images. This is a so-called non-invasive treatment method in which a catheter, a needle or the like is inserted and treatment is performed without leaving a wound on the body as much as possible.

  In the X-ray CT apparatus used for the IVR, an X-ray tube for irradiating X-rays and a reading device for reading X-rays emitted from the X-ray tube are arranged oppositely on the circumference in the gantry. The X-ray tube and the reading device rotate in conjunction with each other about the body axis of the subject so that the X-ray dose transmitted through the subject is read by the reading device, and the read digital data is a computer By processing, a cross section (slice surface) image of the subject is formed.

  Recently, by using an X-ray CT apparatus with faster scanning and image reconstruction, fluoroscopy while monitoring tomograms in real time, specifically, the body of a subject under CT fluoroscopy For example, a tissue such as a tumor can be collected.

  On the other hand, the X-rays irradiated from the X-ray tube and passed through the subject enter the reading device and are processed as tomographic image information. However, a part of the X-rays are scattered by the subject's body, It is emitted as scattered X-rays around the field of the examiner.

  In such an environment, the needle puncture performed in the tissue sampling or the like must be performed in the vicinity of the gantry that continuously irradiates X-rays, so that an operator may be exposed to the scattered X-rays. Is extremely expensive.

  Thus, an X-ray protective cloth has been proposed as an X-ray protective device that prevents the operator from being exposed (see, for example, Patent Document 1).

  FIG. 13 shows the state of use of the X-ray protective cloth (hereinafter abbreviated as protective cloth).

  The protective cloth 50 is made of an X-ray shielding sheet, can be curved to fit the body shape of the subject T, and further has an X-ray shielding surface on the end 50a on the side close to the X-ray. Is formed as a rising portion 50b.

  Patent Document 1 describes that the backscattered X-rays can be largely removed by arranging the protective covering 50 close to the slice surface of the subject T.

  In the figure, reference numeral 51 denotes a gantry of the X-ray CT apparatus, and reference numeral 51a denotes a slit that is irradiated with X-rays from a rotating X-ray tube. Reference numeral 52 denotes a puncture needle holder for operating puncture from a position away from the finger so as not to enter the X-ray beam.

JP 2004-264207 A

  However, although the above-described conventional protective cloth 50 is supposed to protect X-rays scattered in a plane in a specific direction (A direction) on the upper surface side of the bed, in practice, As shown in FIG. 14, it is confirmed that the X-rays incident on the subject T are scattered, and the scattered X-rays SB are three-dimensionally reflected not only in the specific direction but also in all directions.

  Despite the increase in exposure dose in inverse proportion to the square of distance, puncture under CT fluoroscopy requires the operator to approach the X-ray irradiation site, although the risk of exposure is recognized but effective Actually, no X-ray protective measures have been realized.

  The present invention has been made in consideration of the problems in the conventional X-ray protective covering as described above, and provides a radiation shield device that can reliably protect an operator from three-dimensionally scattered X-rays. Is.

The present invention relates to a radiation shield device used for treatment and examination under CT fluoroscopy,
A plate-shaped X-ray shielding base portion provided on the bed of the X-ray CT apparatus and having an edge portion substantially parallel to the body axis of the subject;
An X-ray shielding cover portion that is arched on each edge of the X-ray shielding base portion and covers a part of the body of the subject around the body axis via a predetermined gap;
It is a radiation shielding apparatus comprised from the spacer interposed between the said X-ray shielding base part and the said subject.

  According to the present invention, when one end of the radiation shield device is disposed close to the X-ray irradiation field, that is, the X-ray beam, the path of scattered X-rays emitted from the X-ray irradiation field is blocked by the radiation shield device. .

  The area to be shielded is determined by the distance between one end of the radiation shield device and the X-ray beam and the distance between the cover portion of the radiation shield device and the subject's body surface. The distance between the inner wall and the surface of the subject's body is determined by the X-ray beam width, the subject's physique, the shape of the puncture device, and the size of the gantry opening.

  Moreover, it is necessary to provide a space between the subject and the X-ray shielding base. This interval can be secured by providing the spacer, and is determined by the X-ray beam width, the physique of the subject, and the size of the gantry opening.

  In the present invention, it is preferable that a passage for sliding in the longitudinal direction of the bed with the X-ray shielding base part inserted loosely is provided in the spacer. Since the X-ray shielding base portion inserted into the spacer passage is not in contact with the subject, after determining the irradiation field, the X-ray shielding base portion is slid within the passage, so that the radiation shield device is moved to the X-ray shielding base portion. Can be close to a line beam.

  In the present invention, the X-ray shielding cover part can be configured to be detachable from the X-ray shielding base part.

  Moreover, in this invention, the said X-ray shielding cover part and X-ray shielding base part can be comprised by sticking the lead sheet | seat as an X-ray shielding sheet to each inner wall or each outer wall of a cover part and a base part. it can. The X-ray shielding sheet may be a sheet made of a composite material of tungsten powder and elastomer resin.

  Furthermore, the X-ray shielding cover part and the X-ray shielding base part can be formed of glass or resin containing a material having a high X-ray shielding ability such as lead, barium, or tungsten.

  The irradiation site of the subject, that is, the imaging site is determined by the movement of the bed controlled by the CT apparatus or the movement of the gantry (X-ray tube). Therefore, in the present invention, if the radiation shield apparatus having the above configuration is incorporated in the bed of the CT apparatus and the movement is controlled by the computer by the CT apparatus, one end of the radiation shield apparatus is always X-rayed even if the imaging region is moved. It can be placed close to the beam.

  Further, in the present invention, if the radiation shield apparatus having the above configuration is detachably fixed to the gantry, the radiation shield apparatus is always placed close to the X-ray beam regardless of the movement of the subject, the gantry, and the bed. Can do.

  Incorporating these radiation shield devices into the bed and fixing them to the gantry can be compatible with CT fluoroscopy using a 4D scanner that moves the imaging region at high speed.

  ADVANTAGE OF THE INVENTION According to this invention, the radiation shield apparatus which can protect an operator from the three-dimensionally scattered X-ray reliably can be provided.

It is a schematic diagram explaining the shielding principle of the radiation shielding apparatus which concerns on this invention. It is a schematic diagram which shows the relationship between the radiation shield apparatus which concerns on this invention, and a scattered X ray. It is a schematic diagram which shows the relationship between the radiation shield apparatus which concerns on this invention, and the distance between subjects, and the scattered X ray which can be shielded. It is a disassembled perspective view of the shield apparatus concerning this invention, (a) is an X-ray shielding cover part, (b) is a perspective view of an X-ray shielding base part. It is a perspective view which shows the structure of the spacer which concerns on this invention. It is a perspective view which shows the use condition of the radiation shield apparatus of this invention. It is a side view explaining arrangement | positioning of the radiation shield apparatus shown in FIG. It is a perspective view explaining the effect of the radiation shield apparatus shown in FIG. It is a schematic diagram which shows the use condition of the twin shield apparatus of this invention. It is a schematic diagram which shows the state which incorporated the radiation shield apparatus of this invention in the bed. It is a schematic diagram which shows the state which fixed the radiation shield apparatus of this invention to the gantry. It is a schematic diagram which shows the state which installed the puncture needle holder in the radiation shield apparatus of this invention. It is explanatory drawing which shows the conventional X-ray protective covering. It is a perspective view explaining the conventional X-ray scattering state.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

  First, the shielding principle of the radiation shielding apparatus of the present invention will be described.

  The radiation shield device of the present invention (hereinafter abbreviated as a shield device) is configured to perform CT fluoroscopy by placing one end of the shield device covering the body axis of a subject close to the X-ray irradiation field. Thus, the shield device can scatter the scattered X-rays that have been conventionally three-dimensionally scattered from the X-ray irradiation field and linearly progressed toward an operator who operates near the X-ray irradiation field. It comes to shield by.

  In FIG. 1, when an arbitrary position in the shield device side space from the X-ray beam B where the operator C is present is (P position) and an arbitrary site (E position) of the subject T, the operator C If the shield device 1 is interposed between the straight line connecting the P position and the E position, the scattered radiation emitted from the E position can be blocked.

  Specifically, the scattered X-ray that connects the E position in the X-ray irradiation field and connects the E position with the P position in the vicinity of the X-ray beam B and in the space on the shield apparatus side interferes with the shield apparatus 1. The surgeon C is not exposed to the scattered X-rays with a large X-ray dose because the operator C does not exist in the path along which the scattered X-rays travel.

  Further, the scattered X-rays connecting the E position and the P position overlapping with the operator C by a straight line are blocked by the presence of the shield device 1, so that the operator C is not exposed to scattered X-rays with a high X-ray dose.

  Furthermore, when the E position is on the subject side away from the X-ray irradiation field, the shield apparatus 1 may not be able to block the E position when the E position and the P position overlapping the operator C are connected by a straight line. There is. However, scattered X-rays are overwhelmingly reflected from the skin surface of the irradiation field, and attenuate to a level that cannot be measured after several centimeters from the irradiation field.

  Specifically, it has been experimentally known that the scattered radiation from the skin surface of the subject T 3 cm away from the irradiation field becomes extremely small and becomes 10% or less below the measurement lower limit. Therefore, there is little possibility of receiving by receiving scattered X-rays from the E position away from such an irradiation field.

  In this way, since most of the scattered radiation received by the operator C is emitted from the skin surface of the irradiation field, even if the E position is at an arbitrary position on the subject's body, scattered X-rays reflected from the irradiation field are generated. If the shield device 1 is arranged as a shield target, the operator C can be treated and examined in a state in which exposure by scattered X-rays can be greatly reduced and safety is ensured.

  Since the beam width BW in CT is usually 10 mm or less, the width of the irradiation field is also 10 mm or less.

  Further, from the positional relationship between the operator C and the irradiation field, if the distance between the X-ray shielding cover part (hereinafter abbreviated as the cover part) 2 of the shield device 1 and the subject T is 30 mm, the irradiation received by the operator C is 30 mm. Scattered X-rays from the skin surface can be shielded.

  Incidentally, the scattered X-rays emitted from the irradiation field also generate further scattered X-rays, causing the operator C to be exposed, and the scattered X-rays SB are also emitted from other than the irradiation field of the subject T. . The closer this is to the irradiation field, the more is released (see FIG. 2).

  In this case, as the distance between the cover portion 2 of the shield device 1 and the subject T increases, the scattered X-rays SB emitted from a range further away from the irradiation field can be shielded (see FIG. 3).

  However, if the distance between the cover portion 2 of the shield device 1 and the subject T increases, the puncture device (not shown) comes into contact with the gantry (not shown), and the position where the puncture device is gripped to control the puncture device is increased. There arises a problem that the puncture technique is hindered by being far from the subject T.

  Therefore, the cover portion 2 and the X-ray shielding base portion (hereinafter abbreviated as “base portion”) 3 according to the present invention cover the subject T around the body axis of the subject T via a predetermined gap. The predetermined gap is preferably 30 mm or more and 150 mm or less.

  Hereinafter, the configuration of the shield device according to the present invention will be described in more detail.

  FIG. 4 is an exploded perspective view showing the configuration of the shield device 1. FIG. 4 (a) shows the cover portion 2 of the shield device 1, and FIG. 4 (b) shows that the cover portion 2 is placed and combined. The base part 3 is shown.

  FIG. 5 is a perspective view showing a configuration of a spacer for providing a space between the subject and the base 3, and a two-dot chain line shows the shield device 1 combined with the spacer.

1. Shield device configuration
1.1 Configuration of Cover Part In FIG. 4, the cover part 2 is composed of a cover support body 2a formed of an acrylic resin in a half-cylinder shape, and an X-ray shielding sheet 2b attached to the entire inner wall of the cover support body 2a. It is mainly composed.

  The cover part 2 is arranged along the body axis of the subject and so as to wrap a part of the body of the subject, and is formed in a size that can be covered without contacting the body of the subject. Has been.

  Specifically, the cover 2 is configured to cover a part of the body in an arch around the body axis in a state where a predetermined gap is secured with respect to the surface of the body of the subject.

  In this embodiment, for example, the height H is 300 mm, the width W is 500 mm, the length L is 700 mm, and the thickness t is 5 mm. Note that the above size is an example, and is appropriately determined according to the patient's body.

  Further, each leg portion of the cover portion 2 arranged in an inverted U shape is formed as a rising portion 2c that rises substantially vertically up to a height h of 120 mm. The cross-sectional shape of the cover portion 2 is a shape that matches the trunk portion of the human body. If the cross-sectional shape is too large, the operation of the puncture device performed between the cover portion 2 and the gantry is hindered, and if the cross-sectional shape is too small, Contact with the subject.

  Therefore, the size and shape of the cover 2 are appropriately changed according to the size of the body part (head, trunk, extremities) of the subject and the gantry opening. However, a larger distance between the subject and the cover portion 2 of the shield device 1 is advantageous for protecting the operator.

  An X-ray shielding sheet 2b is attached to the entire inner wall of the cover support 2a. In this embodiment, a lead sheet having a thickness of 0.5 mm is used as the X-ray shielding sheet 2b.

  The X-ray shielding sheet 2b is not limited to the lead sheet as long as it can shield X-rays. For example, a sheet made of a composite material of tungsten powder and elastomer resin can be used.

  Moreover, it replaces with sticking X-ray shielding sheet 2b, and can also comprise cover part 2 by what contained the particle | grains of X-ray shielding material in the constituent material of the cover support body 2a. Specifically, it can be made of glass or resin containing a material having a high X-ray shielding ability such as lead, barium, or tungsten.

1.2 Configuration of Base Part The base part 3 disposed on the bed of the X-ray CT apparatus is composed of a base support 3a obtained by molding an acrylic resin into a plate shape, and an X-ray adhered to the entire upper surface of the base support 3a. It is mainly composed of the shielding sheet 3b.

  Edges 3c and 3c that are substantially parallel to the body axis of the subject are erected at both ends in the width direction of the base part 3 so that the cover part 2 can be positioned by simply placing it. The inner width W ′ of 3 c and 3 c is formed to be slightly larger than the width W of the cover part 2, and the length L of the base part 3 is the same as the length L of the cover part 2.

  In addition, the X-ray shielding sheet 3b uses a lead sheet having a thickness of 0.5 mm as in the case of the X-ray shielding sheet 2b. However, the X-ray shielding sheet 3b may be a sheet made of the above composite material. Thus, the base part 3 can also be comprised with what contained the particle | grains of the X-ray shielding material.

1.3 Configuration of Spacer In FIG. 5, the spacer 4 placed on the bed of the X-ray CT apparatus has an acrylic resin top plate 4a and a bottom plate 4b arranged in parallel, and between the top plate 4a and the bottom plate 4b. A passage M composed of the gap I is provided.

  The passage M is formed by sandwiching side plates 4c having a size larger than the height of the edge portions 3c, 3c of the base portion between the longitudinal end portions of the top plate 4a and the bottom plate 4b.

  A width J of the spacer 4 is formed to be narrower than a width W of the cover portion 2. The length K of the spacer 4 is longer than the length L of the cover portion 2 and is 800 mm in the present embodiment.

  The base portion 3 having the above-described configuration is inserted into the gap I from the lateral direction, and both are positioned so that the longitudinal center axis of the base portion 3 and the longitudinal center axis of the spacer 4 coincide with each other. When the cover portion 2 is installed so as to straddle the portions 3c and 3c, the base portion 3 and the cover portion 2 are combined to form the tunnel-shaped shield device 1 as a whole. In this state, the shield device 1 can be slid in the path M in the direction of arrow N.

  When the shield apparatus 1 is interposed between a straight line connecting an arbitrary position P in the shield apparatus side space from the X-ray beam B and an arbitrary part E of the subject (see FIG. 1) where the operator C exists, E The scattered radiation emitted from the site can be shielded.

  Therefore, when one end of the shield device 1 having the above configuration is disposed close to the X-ray irradiation field, to what extent the portion of the subject to which scattered radiation directed toward the operator is emitted is shielded. The radial size of the cover part 2 is determined, and the distance between the cover part 2 and the body surface of the subject at this time is the predetermined gap.

  In the above embodiment, the X-ray shielding sheets 2b and 3b are attached to the inner wall of the cover support 2a and the inner wall of the base support 3a, respectively, but are attached to the outer walls of the supports 2a and 3a. May be.

2. Method of Using Shield Device FIG. 6 is a perspective view showing the state of use of the shield device 1.

  The bed 12 moves in the Z-axis direction through the opening 11 of the gantry 10 in the X-ray CT apparatus, or the gantry moves in the Z-axis direction. The spacer 4 shown in FIG. The subject T is laid on the bed.

  Note that the X-ray CT apparatus used in this embodiment is SOMATON Sensation 16 manufactured by Siemens, and can perform real-time reconstruction and continuous display of CT images.

  The shield device 1 is arranged so as to cover a part of the body of the subject T around the body axis.

  Specifically, the base portion 3 of the shield device 1 is located between the back surface of the subject T and the bed 12, and the cover portion 2 having a circular arc shape in the shield device 1 is both on the front surface and the side surface of the subject T. It is located in the vicinity of the subject T straddling.

2.1 Positioning of Shield Device As shown in FIG. 7, the one end 1a in the cylinder axis direction of the shield device 1 is arranged as close as possible to the irradiated X-ray beam B.

  As long as the X-ray beam B is not obstructed, the distance between the shield device 1 and the X-ray beam B may theoretically be 0 mm. Actually, the scattered X-ray can be shielded sufficiently even if it is separated from the X-ray beam B by about 1 to 2 mm in consideration of slight movement of the shield device 1 due to mechanical vibration or puncture procedure.

2.2 Effect by Shield Device FIG. 8 shows a state in which treatment is performed under CT fluoroscopy with a part of the body of the subject T covered with the shield device 1 of the present embodiment.

  As apparent from comparison with FIG. 14 showing the conventional X-ray scattering state, the scattered X-rays SB are suppressed by the shield device 1. Specifically, the scattered X-rays are scattered in the irradiation field of the subject T and are linear. In particular, scattered X-rays in the direction toward the operator C are suppressed by the one end 1 a of the shield device 1. In FIG. 8, the gantry 10 is indicated by a two-dot chain line in order to clarify the scattering state of the scattered X-ray SB.

  The shield device 1 is arranged in a cylindrical shape around the body axis of the subject T, and the base 3 of the shield device 1 and the subject T are spaced apart via a spacer 4. Also, the one end 1a of the shield device 1 suppresses scattered X-rays in the direction toward the operator C linearly.

  Place the digital dosimeter 50 mm above the top of one end 1a (measurement point D) in the shield device 1 and 50 mm on the operator's side (reproduce the position of the hand operating the puncture device), and place the chest phantom on the subject. Assuming a lung biopsy under CT fluoroscopy, CT fluoroscopy was performed for 1 minute and the dose of scattered X-rays was measured. As a result, the leaked dose was 273 μSv. On the other hand, as a result of measuring the scattered X-ray dose on the upper surface of the phantom corresponding to the measurement point D without arranging the shield device 1, the dose exceeded the measurement upper limit of 9,999 μSv.

  Thus, it was confirmed that if the shield apparatus 1 is arranged, the dose of X-rays that the operator C is exposed to can be significantly suppressed.

2.3 Other Embodiments of Shielding Device Scattered X-rays emitted from the subject during CT imaging are predominantly emitted from the skin surface included in the irradiation field, and the patient's body and subjects other than the irradiation field Little scattered X-rays are emitted from the surface of the examiner.

  Therefore, in the above-described embodiment, the shield device 1 is arranged for the first purpose to shield scattered X-rays from the skin surface included in the region of the irradiation field.

  However, scattered X-rays emitted from the body of the subject other than the irradiation field can also become radiation that exposes the operator to a small amount (see FIG. 2). In the shield device 1 described above, scattered X-rays from the surface of the irradiation field skin by direct X-rays can be shielded, but the shield of scattered X-rays emitted from the body of the subject opposite to the shield device 1 across the irradiation field. Is insufficient.

  In order to shield this, the second shield device shown in FIG. 9 is used in combination.

  In the form of the shield shown in the figure, the second shield device 5 having basically the same configuration as the shield device 1 described above is arranged in the body axis direction of the subject T with a predetermined interval S secured (in series). The second shield device 5 is disposed so as to cover the body of the subject T on the opposite side of the operator C across the X-ray beam B.

  The predetermined interval (opening) S between the shield devices 1 and 5 may be the same as the X-ray beam width BW as long as the X-ray beam B is not obstructed. In actuality, considering the slight movement of the shield device accompanying the vibration of the machine and the puncture technique, even if the X-ray beam width BW is increased by 1 to 2 mm, a sufficient shield of scattered X-rays can be secured.

  According to the twin shield device shown in FIG. 9, since scattered X-rays leak only from the opening S, there is almost no leakage of scattered X-rays from the irradiation field to the operator C, and regions other than the irradiation field. There is almost no leakage of scattered X-rays. As a result, it becomes possible to further enhance the shielding effect of scattered X-rays.

2.4 CT device with radiation shield function It is inexpensive and effective to use the shield device 1 shown in FIG. 4 for a CT fluoroscopy device currently on the market.

  In addition, if the shield device 1 can be attached to or detached from the bed fixing part or gantry, the shield device 1 can be brought closer to the X-ray beam more accurately, and the shield device 1 is arranged for each procedure. There is no need to do.

  FIG. 10 shows a configuration in which the cover part 2 and the base part 3 of the shield device 1 are incorporated in the bed 12, and FIG. 11 fixes the cover part 2 and the base part 3 of the shield device 1 via the arm 9 to the gantry. Shows the configuration.

  If the shield device 1 can be moved in conjunction with the movement of the slice surface of the subject T, it is not necessary to move the shield device in accordance with the movement of the slice surface during the puncture procedure that usually occurs. However, it is more advantageous for protection that the shield device 1 is incorporated in the bed or the gantry because the distance between the subject T and the shield device 1 can be increased.

  In addition, the gantry may be tilted and CT puncture may be performed on a slice plane that is not orthogonal to the body axis of the subject T. In this case, since the X-ray beam B is not orthogonal to the body axis of the subject T, it is desirable to use an inclined end portion of the cover portion 2.

2.5 Needle puncture When the puncture needle is inserted into the shadow (lesion) displayed on the monitor screen under CT fluoroscopy and the needle tip reaches the shadow, the puncture needle must be accurately punctured so that it always passes through the X-ray beam. There is a need to do. When the puncture needle comes out of the X-ray beam, there arises a disadvantage that the needle does not appear on the slice surface, and as a result, the needle tip cannot reach the target shadow.

  If the surgeon grasps and supports the puncture needle with his hand to stabilize the puncture, there is a problem that the surgeon's hand enters the X-ray beam and is directly exposed to X-rays. A forceps or a puncture needle holder capable of performing a puncture operation at a certain position is used.

  Since the puncture needle holder has a conventionally well-known configuration, it will not be described in detail. However, as shown in FIG. When the operating lever is pulled, the inner needle moves downward and protrudes from the outer needle so as to reach the lesion of the subject T.

  At the time of surgery, the patient's position of the shadow displayed on the monitor screen moves only by breathing, and there is an organ resistance, so there is an unstable state via forceps, a puncture needle holder, etc. The operation of advancing the needle in the X-ray beam and quickly piercing it to the target shadow is difficult unless it is an expert. If a person who is not skilled in the operation performs puncture, it takes time to perform the operation, and the amount of exposure increases for both the subject and the operator.

  On the other hand, in this embodiment, since the shield device 1 having shape retention is disposed, the forceps and the puncture needle holder are supported and stabilized on the upper surface of the one end 1a of the shield device 1. It is possible to perform the puncture operation accurately even if it is not an expert.

  Furthermore, as shown in FIG. 12, a guide rail 6 is provided in the arc direction along one end 1a of the shield device 1, and can be guided and moved by the guide rail 6 at an arbitrary position. If the puncture needle holder 7 that can be fixed is provided and the puncture needle 8 is operated via the puncture needle holder 7, the puncture operation can be performed more accurately and reliably.

1 Shielding device (radiation shielding device)
1a One end part 2 Cover part (X-ray shielding cover part)
2a Cover support 2b X-ray shielding sheet 2c Rising part 3 Base part (X-ray shielding base part)
3a base support 3b X-ray shielding sheet 3c edge 4 spacer 4a top plate 4b bottom plate 4c side plate 5 second shield device 6 guide rail 7 puncture needle holder 8 puncture needle 9 arm 10 gantry 11 opening 12 bed M passage

Claims (6)

In a radiation shield device used for treatment and examination under CT fluoroscopy,
A plate-shaped X-ray shielding base portion provided on the bed of the X-ray CT apparatus and having an edge portion substantially parallel to the body axis of the subject;
An X-ray shielding cover portion that is arched on each edge of the X-ray shielding base portion and covers a part of the body of the subject around the body axis via a predetermined gap;
It is composed of a spacer interposed between the X-ray shielding base and the subject ,
The spacer includes
The radiation shield apparatus characterized that you have passages for sliding in the longitudinal direction of the bed is provided in a state of loosely inserted the X-ray shielding base portion. The radiation shield apparatus according to claim 1, wherein the X-ray shielding cover part and the X-ray shielding base part are formed by attaching an X-ray shielding sheet to each inner wall or each outer wall of the cover part and the base part. The radiation shield device according to claim 2, wherein the X-ray shielding sheet is composed of a lead sheet or a sheet made of a composite material of tungsten powder and an elastomer resin. The radiation shielding apparatus according to claim 1, wherein the X-ray shielding cover part and the X-ray shielding base part are made of glass or resin containing a material having a high X-ray shielding ability such as lead, barium, or tungsten. A CT apparatus with a radiation shield function, wherein the radiation shield apparatus according to any one of claims 1 to 4 is detachably fixed to a gantry. A plate-shaped X-ray shielding base portion provided on the bed of the X-ray CT apparatus and having an edge portion substantially parallel to the body axis of the subject;
An X-ray shielding cover portion that is arched on each edge of the X-ray shielding base portion and covers a part of the body of the subject around the body axis via a predetermined gap; A CT apparatus with a radiation shield function, wherein a radiation shield apparatus used for fluoroscopic treatment and examination is detachably fixed to a gantry.