JPH04290982A - Radial type tomographic device - Google Patents
Radial type tomographic deviceInfo
- Publication number
- JPH04290982A JPH04290982A JP5480791A JP5480791A JPH04290982A JP H04290982 A JPH04290982 A JP H04290982A JP 5480791 A JP5480791 A JP 5480791A JP 5480791 A JP5480791 A JP 5480791A JP H04290982 A JPH04290982 A JP H04290982A
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- JP
- Japan
- Prior art keywords
- detector
- person
- subject
- body axis
- detectors
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000003325 tomography Methods 0.000 claims abstract description 33
- 230000005855 radiation Effects 0.000 claims abstract description 30
- 238000001514 detection method Methods 0.000 claims description 31
- 210000001015 abdomen Anatomy 0.000 abstract description 15
- 238000013459 approach Methods 0.000 abstract description 9
- 210000000481 breast Anatomy 0.000 abstract 1
- 210000003128 head Anatomy 0.000 abstract 1
- 238000007689 inspection Methods 0.000 abstract 1
- 238000003384 imaging method Methods 0.000 description 29
- 238000010586 diagram Methods 0.000 description 8
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、被検者の体内から放出
される放射線を３個以上の検出器により検出し、その断
層像を得る放射形断層撮影装置に係わり、特に、頭部と
腹部のように撮影部位の寸法に大小があっても、分解能
の良好な高い画質の断層像を得るのに好適な装置に関す
る。[Field of Industrial Application] The present invention relates to a radiation tomography apparatus that detects radiation emitted from the body of a subject using three or more detectors and obtains a tomographic image thereof, and in particular, The present invention relates to an apparatus suitable for obtaining high-quality tomographic images with good resolution even when the size of the imaged region such as the abdomen varies.
【０００２】0002
【従来の技術】３個以上の検出器を備えた従来の放射形
断層撮影装置を、図７ないし図１０により説明する。図
７は検出器が４個の場合の放射形断層撮影装置の全体斜
視図、図８は検出器が３個の場合の放射形断層撮影装置
の全体斜視図、図９は図８に示す放射形断層撮影装置に
よる胸部や腹部の撮影状態説明図、図１０は図８に示す
放射形断層撮影装置による頭部の撮影状態説明図である
。2. Description of the Related Art A conventional radiation tomography apparatus equipped with three or more detectors will be explained with reference to FIGS. 7 to 10. FIG. 7 is an overall perspective view of a radiation tomography device with four detectors, FIG. 8 is an overall perspective view of a radiation tomography device with three detectors, and FIG. 9 is a perspective view of the radiation tomography device shown in FIG. 8. FIG. 10 is an explanatory diagram of the imaging state of the chest and abdomen by the radial tomography apparatus shown in FIG. 8. FIG.
【０００３】図において、１は床面に直立させて設けた
枠体、２は枠体１に支持されたドーナツ状の円盤で、円
盤２は図示しない駆動装置により軸Ｃの回りを回動可能
になっている。ここで軸Ｃは、横臥した被検者の体軸と
ほぼ一致している。２ａは円盤２の中心部に設けられて
いる被検者挿入用の開口である。３は円盤２に放射状に
等分に配設された検出器で、図７の場合は９０°に４個
が、また、図８の場合は１２０°に３個がそれぞれ等分
に配置されている。このため、図７においては、断層撮
影の視野となる４個の検出器３の検出面３ａで囲む空間
４は正４角柱を形成し、図８においては、断層撮影の視
野となる３個の検出器３の検出面３ａで囲む空間４が、
正３角柱を形成するようになっている。各検出器３は被
検者の体軸に正対させた長方形の検出面３ａを有してい
て、円盤２とともに軸Ｃの回りを回動し、被検者の体内
から放出される放射線を検出して断層像を撮影する。こ
の場合、検出面３ａには、撮影部位から検出器３に対し
て放射線（例えば、γ線）を一定の角度で効率よく入射
させるように、コリメータが取り付けられている。In the figure, 1 is a frame mounted upright on the floor, 2 is a donut-shaped disk supported by the frame 1, and the disk 2 can be rotated around an axis C by a drive device (not shown). It has become. Here, the axis C substantially coincides with the body axis of the subject lying on his side. 2a is an opening provided in the center of the disk 2 for insertion of a subject. 3 is a detector arranged evenly in a radial direction on the disk 2; in the case of Fig. 7, four detectors are arranged equally at 90°, and in the case of Fig. 8, three detectors are arranged equally at 120°. There is. Therefore, in FIG. 7, the space 4 surrounded by the detection surfaces 3a of the four detectors 3, which is the field of view for tomography, forms a regular square prism, and in FIG. The space 4 surrounded by the detection surface 3a of the detector 3 is
It forms a regular triangular prism. Each detector 3 has a rectangular detection surface 3a directly facing the subject's body axis, rotates around an axis C together with the disk 2, and detects radiation emitted from the subject's body. Detect and take a tomographic image. In this case, a collimator is attached to the detection surface 3a so that radiation (for example, gamma rays) is efficiently incident on the detector 3 from the imaging site at a constant angle.
【０００４】撮影に当たっては、前記検出器３に入射す
る放射線を的確に検出できるように、検出面３ａを撮影
部位に可及的に接近させて行われる。この検出面３ａの
接近は図示しない駆動手段により行われ、反対に該接近
位置から後退させることも同駆動手段により行われる。
そして、該接近および後退は、各検出器３を同時に行う
ことも、また、各個別に行うことも可能になっている。[0004] During imaging, the detection surface 3a is brought as close as possible to the area to be imaged so that the radiation incident on the detector 3 can be accurately detected. This approach of the detection surface 3a is performed by a drive means (not shown), and conversely, the same drive means is used to move the detection surface 3a backward from the approach position. The approach and retreat can be performed for each detector 3 simultaneously or individually.
【０００５】図９に示すように、被検者５の胸部や腹部
等の大きい寸法の部分を撮影する場合は、まず、空間４
を対応する寸法にするため、各検出器３を前記図示しな
い駆動手段により矢印Ａ方向、すなわち、軸Ｃから放射
状方向へ同時にまたは個別に後退させ、断層撮影の視野
を拡大する。ついで空間４内で撮影部位を位置決めし、
各検出器３を円盤２とともに前記図示しない駆動装置に
より軸Ｃの回りを回動させて、心臓等の断層像を撮影す
るようになっている。一方、図１０に示すように被検者
５の頭部を撮影する場合は、図９の場合と同様に空間４
を対応する寸法にするため、各検出器３を前記図示しな
い駆動手段により矢印Ｂ方向、すなわち、軸Ｃに向けて
放射状に同時にまたは個別に接近させ、断層撮影の視野
を縮小する。ついで空間４内で撮影部位を位置決めし、
各検出器３を円盤２とともに前記図示しない駆動装置に
より軸Ｃの回りを回動させて、頭部の断層像を撮影する
ようになっている。As shown in FIG. 9, when photographing a large area such as the chest or abdomen of the subject 5, first the space 4 is
In order to have corresponding dimensions, each detector 3 is moved back simultaneously or individually in the direction of the arrow A, that is, in the radial direction from the axis C, by the drive means (not shown), thereby enlarging the field of view for tomography. Next, position the imaging site within the space 4,
Each detector 3 is rotated along with the disc 2 about an axis C by the drive device (not shown) to take a tomographic image of the heart or the like. On the other hand, when photographing the head of the subject 5 as shown in FIG.
In order to have corresponding dimensions, each detector 3 is moved radially toward the arrow B direction, that is, toward the axis C, simultaneously or individually by the drive means (not shown), thereby reducing the tomographic field of view. Next, position the imaging site within the space 4,
Each detector 3 is rotated along with the disc 2 about an axis C by the drive device (not shown) to take a tomographic image of the head.
【０００６】上記図９，１０における断層撮影の視野の
拡大・縮小は、検出器３が３個の場合について説明した
が、図７に示す検出器３が４個の場合でも同様に行われ
る。Expansion/reduction of the field of view for tomography in FIGS. 9 and 10 has been described for the case where there are three detectors 3, but it is performed in the same way when the number of detectors 3 is four as shown in FIG.
【０００７】他方、図示していないが、長方形の検出面
を有する１個の検出器を使用して、該検出器を横臥した
被検者の体軸の回りに回動させて行う断層撮影と、検出
器を被検者の体軸に沿って移動して行う全身撮影との両
方を行えるようにした撮影装置が提供されている。この
装置は、横臥した被検者の上方に体軸に沿ってレールを
配置し、該レール上を移動可能に検出器を設け、断層撮
影時には主として長方形検出面の長辺側を体軸と平行に
し、全身撮影時には短辺側を体軸と平行にして撮影がで
きるように、検出器を回動可能にしたものである。この
場合、前記検出器を移動させるレールの両端部は、検出
器が該レールとともに被検者の体軸の回りに回動できる
ように支持されている。On the other hand, although not shown, tomography is performed by using a single detector having a rectangular detection surface and rotating the detector around the body axis of a lying subject. 2. Description of the Related Art There has been provided an imaging device that can perform both full-body imaging by moving a detector along the body axis of a subject. This device places a rail along the body axis above a lying subject, and a detector is provided so that it can move on the rail. During tomography, the long side of the rectangular detection surface is mainly parallel to the body axis. The detector is rotatable so that when taking a full-body image, the short side can be taken parallel to the body axis. In this case, both ends of the rail on which the detector is moved are supported so that the detector can rotate together with the rail around the subject's body axis.
【０００８】[0008]
【発明が解決しようとする課題】上記従来の放射形断層
撮影装置において被検者５の頭部を撮影する場合は、図
１０に示すように各検出器３で形成する空間４がほぼ閉
じた正３角形となるが、胸部や腹部等の大きい寸法の部
分を撮影する場合には、図９に示すように空間４が閉じ
た正３角形にならず、３角形の各頂点部が開いて隣接す
る検出器３間の間隔が大きくなる。反対に、胸部や腹部
等の大きい寸法の部分を撮影する場合に空間４をほぼ閉
じた正３角形にすると、頭部等の小さい寸法の部分を撮
影する場合には、撮影部位に検出器３を接近させること
ができないことになる。このことは検出器３が４個の場
合でも同じである。[Problems to be Solved by the Invention] When photographing the head of a subject 5 using the conventional radiation tomography apparatus described above, as shown in FIG. 10, the space 4 formed by each detector 3 is almost closed. However, when photographing a large area such as the chest or abdomen, the space 4 will not be a closed regular triangle as shown in Figure 9, but each vertex of the triangle will be open. The distance between adjacent detectors 3 becomes larger. On the other hand, when imaging a large area such as the chest or abdomen, the space 4 is made into a nearly closed regular triangle; when imaging a small area such as the head, the detector 3 is placed at the imaging site. This means that it will not be possible to bring them close together. This is the same even when there are four detectors 3.
【０００９】前記空間４がほぼ閉じた状態、すなわち隣
接する検出器３の端部が互いに接触する程度まで接近し
た状態においては、撮影部位からの放射線を検出器３に
対して効率よく入射させることができるが、空間４が閉
じた状態にならない場合には、検出面３ａを撮影部位に
可及的に接近させても、撮影部位からの放射線は隣接す
る検出器３間の隙間から漏洩して、検出器３に対して入
射すべき線量が減少する。このため、統計雑音の発生か
ら分解能を低下させ、不鮮明な断層像になる問題点を有
していた。一方、検出器寸法を大きくして胸部等の大き
い寸法の部分を撮影する場合に空間４をほぼ閉じる状態
にすると、頭部等の小さい寸法の部分を撮影する場合に
、検出面３ａを撮影部位に接近させることができなくな
るから、放射線の検出効率を低下させるとともに、大き
い検出器寸法は製作費の面でも効率が低下する問題点を
有していた。When the space 4 is substantially closed, that is, when the ends of adjacent detectors 3 are close to each other to the extent that they touch each other, radiation from the imaging site can be efficiently incident on the detectors 3. However, if the space 4 is not closed, even if the detection surface 3a is brought as close as possible to the imaging site, radiation from the imaging site may leak through the gap between adjacent detectors 3. , the dose that should be incident on the detector 3 is reduced. For this reason, there has been a problem in that the resolution is lowered due to the generation of statistical noise, resulting in unclear tomographic images. On the other hand, if the detector size is increased so that the space 4 is almost closed when photographing a large-sized part such as the chest, then when photographing a small-sized part such as the head, the detection surface 3a is Since the detector cannot be brought close to the detector, the radiation detection efficiency is lowered, and the large size of the detector has the problem of lowering the efficiency in terms of manufacturing costs.
【００１０】他方、前記１個の検出器を断層撮影と全身
撮影との両方に使用できるように回動可能にしたものは
、各撮影時に検出器の検出面を、撮影部位に十分接近さ
せられる利点はあるが、１個の検出器で放射線の検出を
行うため検出される線量が少なく、撮影時間が長くなる
だけでなく、統計ノイズが大きくなることから画質の低
下が避けられないという問題点を有していた。On the other hand, in the case where the single detector is rotatable so that it can be used for both tomography and whole-body imaging, the detection surface of the detector can be brought sufficiently close to the imaging site during each imaging. Although there are advantages, the problem is that since radiation is detected with a single detector, the amount of radiation detected is small, which not only increases imaging time, but also increases statistical noise, resulting in an unavoidable decline in image quality. It had
【００１１】本発明は、上記従来技術の問題点に鑑み、
頭部と胸部または腹部のように撮影部位の寸法に大小が
あっても、分解能の良好な高画質の断層像を得ることが
できる放射形断層撮影装置を提供することを目的とする
。[0011] In view of the problems of the above-mentioned prior art, the present invention
It is an object of the present invention to provide a radiation tomography apparatus capable of obtaining a high-quality tomographic image with good resolution even if the size of the imaged part is large or small, such as the head, chest, or abdomen.
【００１２】0012
【課題を解決するための手段】上記目的を達成するため
、本発明は、床面に直立させて設けた枠体と、横臥した
被検者の体軸の回りを回動可能に前記枠体に支持された
ドーナツ状の円盤と、前記被検者の体軸に正対する長方
形の検出面を有し、前記円盤に放射状に等分に配設され
て被検者の体内から放出される放射線を検出する３個以
上の検出器と、該各検出器を前記被検者の体軸に対して
接近させ、または後退させる駆動手段とを備えた放射形
断層撮影装置において、前記各検出器の背面中央に検出
面に垂直に突出させた軸と、該軸の回りに検出器を回動
可能に支持するトラニオンとを設け、断層撮影の視野を
前記被検者の撮影部位に応じて各長方形検出面の長辺同
士または短辺同士で形成可能に構成したものである。[Means for Solving the Problems] In order to achieve the above object, the present invention provides a frame body provided upright on a floor surface, and a frame body rotatable around the body axis of a lying subject. radiation emitted from the body of the subject by being arranged radially equally on the disk and having a rectangular detection surface directly facing the body axis of the subject; In a radiation tomography apparatus comprising three or more detectors that detect A shaft protruding perpendicularly to the detection surface at the center of the back surface and a trunnion that rotatably supports the detector around the shaft are provided, and the field of view for tomography is adjusted to each rectangular shape according to the region to be imaged of the subject. It is configured such that the detection surfaces can be formed by either the long sides or the short sides.
【００１３】[0013]
【作用】上記構成としたことにより、頭部のように小さ
い寸法の撮影部位に対しては、トラニオンに支持された
各検出器を、該各検出器の長方形検出面の長辺側が被検
者の体軸と平行になるように、各検出器の背面中央に設
けた垂直軸の回りに回動させる。この状態で頭部寸法に
対応する空間を形成するように、駆動手段を駆動して各
検出器の検出面を前記被検者の体軸に平行状態で接近さ
せ、前記空間がほぼ閉じた状態、すなわち隣接する検出
器の端部が互いに接触する程度の状態にする。[Operation] With the above configuration, when imaging a small sized body part such as the head, each detector supported by a trunnion is placed so that the long side of the rectangular detection surface of each detector is located close to the subject. Each detector is rotated around a vertical axis provided at the center of the back surface so that it is parallel to the body axis of the detector. In this state, the driving means is driven so that the detection surface of each detector approaches the subject's body axis in parallel to form a space corresponding to the head size, and the space is almost closed. That is, the ends of adjacent detectors are brought into contact with each other.
【００１４】一方、胸部または腹部のように大きい寸法
の撮影部位に対しては、トラニオンに支持された各検出
器を、該各検出器の長方形検出面の短辺側が被検者の体
軸と平行になるように、各検出器の背面中央に設けた垂
直軸の回りに回動させる。そして、この状態で胸部また
は腹部の寸法に対応する空間を形成するように、駆動手
段を駆動して各検出器の検出面を前記被検者の体軸に平
行状態で接近させ、前記空間がほぼ閉じた状態、すなわ
ち隣接する検出器の端部が互いに接触する程度の状態に
する。On the other hand, for large-sized imaging areas such as the chest or abdomen, each detector supported by a trunnion is placed so that the short side of the rectangular detection surface of each detector is aligned with the subject's body axis. Rotate the detectors around a vertical axis located at the center of the back of each detector so that they are parallel to each other. Then, in this state, the driving means is driven so that the detection surface of each detector approaches the subject's body axis in parallel to form a space corresponding to the dimensions of the chest or abdomen, and the space is The detectors are placed in a nearly closed state, ie, the ends of adjacent detectors are in contact with each other.
【００１５】上記いずれの場合も、撮影部位の寸法に応
じて、３個以上の検出器で形成する空間が閉じた状態で
、各検出面を撮影部位に可及的に接近させることができ
、分解能の良好な断層像を得ることが可能になる。In any of the above cases, each detection plane can be brought as close as possible to the imaging site while the space formed by three or more detectors is closed, depending on the dimensions of the imaging site; It becomes possible to obtain a tomographic image with good resolution.
【００１６】[0016]
【実施例】以下、本発明の一実施例を図１ないし図６を
参照して説明する。図１は検出器が４個の場合の放射形
断層撮影装置の全体斜視図、図２は検出器支持部の詳細
断面図、図３は図１に示す放射形断層撮影装置の正面図
、図４は図３の側面図、図５は図１に示す放射形断層撮
影装置による胸部や腹部の撮影状態説明図、図６は図１
に示す放射形断層撮影装置による頭部の撮影状態説明図
である。図中、図７ないし図１０と同符号のものは同じ
ものを示す。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. FIG. 1 is an overall perspective view of a radiation tomography apparatus with four detectors, FIG. 2 is a detailed sectional view of a detector support, and FIG. 3 is a front view of the radiation tomography apparatus shown in FIG. 4 is a side view of FIG. 3, FIG. 5 is an explanatory diagram of the state of imaging of the chest and abdomen by the radiation tomography apparatus shown in FIG. 1, and FIG. 6 is a diagram of FIG.
FIG. 2 is an explanatory diagram of a state in which the head is imaged by the radial tomography apparatus shown in FIG. In the figure, the same reference numerals as in FIGS. 7 to 10 indicate the same parts.
【００１７】図において、６は各検出器３の背面中央に
、検出面３ａに垂直に突出させて設けた軸、７は軸６の
回りに検出器３を回動可能に支持するトラニオン、７ａ
はトラニオン６の両端の軸である。検出器３を軸６の回
りに回動可能にしたため、長方形の検出面３ａの向きを
長辺と短辺のいずれにも任意に変えることが可能である
。８は先端部を軸７ａに軸受を介して嵌合し、中間部を
円盤２にピン９により傾動可能に支持されたアームで、
アーム８の後端部には検出器３の重量とバランスさせる
ためのカウンターウエイト１０が取り付けられている。
なお、図４に示すように、アーム８の傾動時には、トラ
ニオン７が軸７ａの回りに回動し、各検出器３の検出面
３ａが被検者５の体軸に平行状態で接近しまたは後退す
るようになっている。In the figure, 6 is a shaft provided at the center of the back surface of each detector 3, projecting perpendicularly to the detection surface 3a, 7 is a trunnion that rotatably supports the detector 3 around the shaft 6, 7a
are the axes at both ends of the trunnion 6. Since the detector 3 is rotatable around the axis 6, the orientation of the rectangular detection surface 3a can be changed arbitrarily to either the long side or the short side. Reference numeral 8 denotes an arm whose tip part is fitted onto the shaft 7a via a bearing, and whose middle part is tiltably supported by a pin 9 on the disc 2;
A counterweight 10 is attached to the rear end of the arm 8 to balance the weight of the detector 3. As shown in FIG. 4, when the arm 8 is tilted, the trunnion 7 rotates around the axis 7a, and the detection surface 3a of each detector 3 approaches the body axis of the subject 5 in a parallel state. It's starting to move backwards.
【００１８】上記構成を有することから、胸部または腹
部のように大きい寸法の撮影部位に対しては、図５に示
すように、トラニオン７に支持された各検出器３を、各
検出器３の検出面３ａの短辺側が被検者５の体軸と平行
になるように軸６の回りに回動させる。そして、この状
態で胸部または腹部の寸法に対応する空間４を形成する
ようにアーム８を傾動し、各検出面３ａを被検者５の体
軸に平行状態で接近させ、空間４が閉じた状態、すなわ
ち隣接する検出器３の端部が互いに接触する程度まで傾
ける。With the above-mentioned configuration, for large-sized imaging sites such as the chest or abdomen, each detector 3 supported by the trunnion 7 can be connected to the other detector 3 as shown in FIG. The detection surface 3a is rotated about the axis 6 so that the short side thereof becomes parallel to the body axis of the subject 5. Then, in this state, the arm 8 is tilted so as to form a space 4 corresponding to the dimensions of the chest or abdomen, and each detection surface 3a approaches the subject's 5 body axis in a parallel state, so that the space 4 is closed. state, i.e. tilted to such an extent that the ends of adjacent detectors 3 touch each other.
【００１９】一方、頭部のように小さい寸法の撮影部位
に対しては、図６に示すように、トラニオン７に支持さ
れた各検出器３を、各検出器３の検出面３ａの長辺側が
被検者５の体軸と平行になるように軸６の回りに回動さ
せる。この状態で頭部の寸法に対応する空間４を形成す
るようにアーム８を傾け、各検出面３ａを被検者５の体
軸に平行状態で接近させ、空間４が閉じた状態、すなわ
ち隣接する検出器３の端部が互いに接触する程度の状態
にする。On the other hand, for a small imaging site such as the head, as shown in FIG. It is rotated around the axis 6 so that the sides thereof are parallel to the body axis of the subject 5. In this state, the arm 8 is tilted so as to form a space 4 corresponding to the size of the head, and each detection surface 3a approaches the subject's 5 body axis in a parallel state, and the space 4 is closed, that is, adjacent to each other. The ends of the detectors 3 are brought into contact with each other.
【００２０】上記のように断層撮影の視野となる空間４
を形成することにより、空間４の大きさは、撮影部位の
寸法に応じて閉じた状態で変更することが可能となり、
該閉じた空間４内で３個以上の検出器３の検出面３ａを
撮影部位に可及的に接近させることができるから、検出
される線量が多くなり、撮影時間が短くなるとともに、
統計雑音も小さくなることから分解能の良好な高い画質
の断層像を得ることが可能になる。As mentioned above, the space 4 that becomes the field of view for tomography
By forming the space 4, the size of the space 4 can be changed in the closed state according to the dimensions of the imaging site,
Since the detection surfaces 3a of three or more detectors 3 can be brought as close as possible to the imaging site within the closed space 4, the detected dose is increased, the imaging time is shortened, and
Since statistical noise is also reduced, it becomes possible to obtain high-quality tomographic images with good resolution.
【００２１】[0021]
【発明の効果】以上説明したように本発明は、頭部と胸
部または腹部のように、撮影部位の寸法に大小があって
も、分解能の良好な高画質の断層像を得ることができる
効果を奏する。[Effects of the Invention] As explained above, the present invention has the advantage that high-quality tomographic images with good resolution can be obtained even if the size of the imaged area is large or small, such as the head, chest, or abdomen. play.
【図１】本発明の一実施例の検出器が４個の場合の放射
形断層撮影装置の全体斜視図である。FIG. 1 is an overall perspective view of a radiation tomography apparatus in which there are four detectors according to an embodiment of the present invention.
【図２】図１の検出器支持部の詳細断面図である。FIG. 2 is a detailed sectional view of the detector support of FIG. 1;
【図３】図１に示す放射形断層撮影装置の正面図である
。FIG. 3 is a front view of the radial tomography apparatus shown in FIG. 1.
【図４】図３の側面図である。FIG. 4 is a side view of FIG. 3;
【図５】図１に示す放射形断層撮影装置による胸部や腹
部の撮影状態説明図である。FIG. 5 is an explanatory diagram of the state of imaging the chest and abdomen by the radiation tomography apparatus shown in FIG. 1;
【図６】図１に示す放射形断層撮影装置による頭部の撮
影状態説明図である。FIG. 6 is an explanatory diagram of a head image taken by the radiation tomography apparatus shown in FIG. 1;
【図７】検出器が４個の場合の従来の放射形断層撮影装
置の全体斜視図である。FIG. 7 is an overall perspective view of a conventional radiation tomography apparatus with four detectors.
【図８】検出器が３個の場合の従来の放射形断層撮影装
置の全体斜視図である。FIG. 8 is an overall perspective view of a conventional radiation tomography apparatus with three detectors.
【図９】図８に示す放射形断層撮影装置による胸部や腹
部の撮影状態説明図である。FIG. 9 is an explanatory diagram of a state of imaging the chest and abdomen by the radiation tomography apparatus shown in FIG. 8;
【図１０】図８に示す放射形断層撮影装置による頭部の
撮影状態説明図である。10 is an explanatory diagram of a state in which the head is imaged by the radial tomography apparatus shown in FIG. 8; FIG.
１…枠体、２…円盤、３…検出器、３ａ…検出面、４…
空間、６…軸、７…トラニオン、７ａ…軸、８…アーム
、Ｃ…軸。DESCRIPTION OF SYMBOLS 1... Frame body, 2... Disk, 3... Detector, 3a... Detection surface, 4...
Space, 6...axis, 7...trunnion, 7a...axis, 8...arm, C...axis.
Claims (1)
被検者の体軸の回りを回動可能に前記枠体に支持された
ドーナツ状の円盤と、前記被検者の体軸に正対する長方
形の検出面を有し、前記円盤に放射状に等分に配設され
て被検者の体内から放出される放射線を検出する３個以
上の検出器と、該各検出器を前記被検者の体軸に対して
接近させ、または後退させる駆動手段とを備えた放射形
断層撮影装置において、前記各検出器の背面中央に検出
面に垂直に突出させた軸と、該軸の回りに検出器を回動
可能に支持するトラニオンとを設け、断層撮影の視野を
前記被検者の撮影部位に応じて各長方形検出面の長辺同
士または短辺同士で形成可能に構成したことを特徴とす
る放射形断層撮影装置。Claims: 1. A frame provided upright on a floor; a donut-shaped disk supported by the frame so as to be rotatable around the body axis of a lying subject; three or more detectors each having a rectangular detection surface directly facing the body axis and arranged radially equally on the disk to detect radiation emitted from the body of the subject, and each of the detectors; A radiation tomography apparatus comprising: a drive means for moving the detector toward or retreating from the subject's body axis; A trunnion that rotatably supports the detector around the axis is provided, and the field of view for tomography can be formed between the long sides or the short sides of each rectangular detection surface depending on the area to be imaged of the subject. A radial tomography device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5480791A JPH04290982A (en) | 1991-03-19 | 1991-03-19 | Radial type tomographic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5480791A JPH04290982A (en) | 1991-03-19 | 1991-03-19 | Radial type tomographic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04290982A true JPH04290982A (en) | 1992-10-15 |
Family
ID=12981001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5480791A Pending JPH04290982A (en) | 1991-03-19 | 1991-03-19 | Radial type tomographic device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04290982A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007263865A (en) * | 2006-03-29 | 2007-10-11 | Shimadzu Corp | Nuclear medicine diagnostic equipment |
| US8441474B2 (en) | 2008-06-25 | 2013-05-14 | Aristocrat Technologies Australia Pty Limited | Method and system for setting display resolution |
| JP2017086903A (en) * | 2015-11-02 | 2017-05-25 | 東芝メディカルシステムズ株式会社 | Medical image diagnostic system, morphological image diagnostic apparatus, and nuclear medicine image diagnostic apparatus |
-
1991
- 1991-03-19 JP JP5480791A patent/JPH04290982A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007263865A (en) * | 2006-03-29 | 2007-10-11 | Shimadzu Corp | Nuclear medicine diagnostic equipment |
| JP4650324B2 (en) * | 2006-03-29 | 2011-03-16 | 株式会社島津製作所 | Nuclear medicine diagnostic equipment |
| US8441474B2 (en) | 2008-06-25 | 2013-05-14 | Aristocrat Technologies Australia Pty Limited | Method and system for setting display resolution |
| JP2017086903A (en) * | 2015-11-02 | 2017-05-25 | 東芝メディカルシステムズ株式会社 | Medical image diagnostic system, morphological image diagnostic apparatus, and nuclear medicine image diagnostic apparatus |
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