JPS63264044A - Phantom for x-ray ct apparatus - Google Patents
Phantom for x-ray ct apparatusInfo
- Publication number
- JPS63264044A JPS63264044A JP62098648A JP9864887A JPS63264044A JP S63264044 A JPS63264044 A JP S63264044A JP 62098648 A JP62098648 A JP 62098648A JP 9864887 A JP9864887 A JP 9864887A JP S63264044 A JPS63264044 A JP S63264044A
- Authority
- JP
- Japan
- Prior art keywords
- phantom
- ray
- porous member
- value
- lung parenchyma
- 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.)
- Pending
Links
- 210000004072 lung Anatomy 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 8
- 238000011156 evaluation Methods 0.000 claims description 6
- 206010014561 Emphysema Diseases 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000004925 Acrylic resin Substances 0.000 description 4
- 229920000178 Acrylic resin Polymers 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000011148 porous material Substances 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- -1 and for example Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000005265 lung cell Anatomy 0.000 description 1
- 125000005397 methacrylic acid ester group Chemical group 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 210000000779 thoracic wall Anatomy 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/58—Testing, adjusting or calibrating apparatus or devices for radiation diagnosis
- A61B6/582—Calibration
- A61B6/583—Calibration using calibration phantoms
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明はＸ線Ｃ下装置の性能評価に用いられるＸ線ＣＴ
装置用ファントムに関する。[Detailed Description of the Invention] [Object of the Invention] (Field of Industrial Application) The present invention relates to an X-ray CT system used for performance evaluation of an X-ray CT
This invention relates to a device phantom.
（従来の技術）
従来よりＸ線ＣＴ装置の性能評価用に種々のファントム
が用いられている。(Prior Art) Various phantoms have been used to evaluate the performance of X-ray CT apparatuses.
このファントムは、空間分解能をしらべるために第４図
に示すようなアクリル樹脂（ａｃｒｙｌｉｃ ｒｅｓ
ｉｎｓ）からなる板状体１としたもので、これに例えば
直径ｄからなる貫通孔１ａを相互に２ｄの間隔を有して
多数配列形成させたものである。This phantom was made of acrylic resin as shown in Figure 4 in order to examine the spatial resolution.
The plate-like body 1 is made of a material (ins), on which a large number of through-holes 1a having a diameter of d, for example, are formed in an array at intervals of 2d from each other.
上記アクリル樹脂はメタクリル酸エステル系ボツマの重
合体から作られるもので、例えばポリメタクリル酸エス
テル、ポリアクリル酸エステル等である。The above-mentioned acrylic resin is made from a methacrylic acid ester-based polymer, such as polymethacrylic ester, polyacrylic ester, etc.
一方、低コントラスト分解能を調べるには第５図に示す
ようなポリスチレンからなる板状体２に数ｍｍ乃至１０
数ｍｍの孔２ａを穿設したものを水中に入れ、この板状
体２を包囲するスライス厚さとしてパーシャルボリウム
効果により水とのコントラスト差を小さくするようにし
ている。On the other hand, in order to investigate low contrast resolution, a plate-shaped body 2 made of polystyrene as shown in FIG.
A device with a hole 2a of several mm in size is placed in water, and the thickness of the slice surrounding this plate-like object 2 is set so as to reduce the contrast difference with water due to the partial volume effect.
（発明が解決しようとする問題点）
ところで、上述したようなファントムでは、肺実質部と
肺気腫との鑑別能力の評価ができないという問題がある
。これは、従来のファントムが水と水から多少異なるＣ
Ｔ値との識別かあるいは空気とアクリル樹脂のＣＴ値（
１００乃至１５ｏ）との識別能力を評価するものである
のに対し、上記肺気腫は肺実質部の一部がいわば欠落し
て孔ができたものであり、また、肺実質部は肺細胞及び
肺胞からなるために、そのＣＴ値は比較的空気のＣＴ値
に近いものである。(Problems to be Solved by the Invention) However, with the above-mentioned phantom, there is a problem in that the ability to differentiate between lung parenchyma and emphysema cannot be evaluated. This is because the conventional phantom differs somewhat from water and water.
Identification with T value or CT value of air and acrylic resin (
100 to 15o), whereas in the case of emphysema, a part of the lung parenchyma is missing and a hole is formed, and the lung parenchyma is composed of lung cells and lungs. Since it is composed of cells, its CT value is relatively close to that of air.
従って、上述したファントムは肺気腫、肺実質部に近い
ＣＴ値（−９９０乃至−８００＞としたものでなければ
、性能評価の実効を図ることができない。Therefore, unless the above-mentioned phantom has a CT value (-990 to -800>) close to emphysema and lung parenchyma, performance evaluation cannot be performed effectively.
そこで本発明の目的とするところは、肺気腫。Therefore, the purpose of the present invention is to treat pulmonary emphysema.
肺実質部の画質評価を定量的に行えるＸ線ＣＴ装置用フ
ァントムの提供にある。An object of the present invention is to provide a phantom for an X-ray CT device that can quantitatively evaluate the image quality of lung parenchyma.
［発明の構成］
（問題点を解決するための手段）
上記問題点を解決するための本発明の構成は、Ｘ線ＣＴ
装置の性能評価に用いられるＸ線ＣＴ装置用ファントム
において、該ファントムを多孔性部材から形成したこと
を特徴としている。[Structure of the Invention] (Means for Solving the Problems) The structure of the present invention for solving the above problems is based on the X-ray CT
A phantom for an X-ray CT device used for evaluating the performance of the device is characterized in that the phantom is formed from a porous member.
（作 用）
上記構成を有する本発明の作用は、ファントムを多数の
細孔からなる多孔性部材から形成させて、そのＣＴ値を
肺実質部にほぼ同一としている。(Function) The function of the present invention having the above configuration is to form the phantom from a porous member having a large number of pores, and to make the CT value of the phantom substantially the same as that of the lung parenchyma.
（実施例）
以下本発明の一実施例について図面を参照して説明する
。(Example) An example of the present invention will be described below with reference to the drawings.
第１図は本発明の一実施例ファントムの外観斜視図であ
る。FIG. 1 is an external perspective view of a phantom according to an embodiment of the present invention.
同図に示すファントム３は、多数の泡状細孔（微細ゆえ
図示しない）をほぼ均一に分散させた例えばゴム材から
なる多孔性部材３ｂからなるものを、円盤状に形成させ
たものである。また、その厚さく紙面と直交する方向）
はＸ線ＣＴ装置のスライス厚さより大寸法としている。The phantom 3 shown in the figure is a disc-shaped porous member 3b made of a rubber material, for example, in which a large number of bubble-like pores (not shown because they are minute) are almost uniformly dispersed. . Also, its thickness is in the direction perpendicular to the paper surface)
is larger than the slice thickness of the X-ray CT device.
ざらに図示ファントム３には、はぼ中心部から外周にか
けて形成された扇子状の切欠部４を有するものである。The illustrated phantom 3 has a fan-shaped notch 4 formed from the center to the outer periphery.
さらに、該部材には貫通孔３ａを数種の直径と数種の間
隔で設けである。Furthermore, the member is provided with through holes 3a at several different diameters and at several different intervals.
前述したように多孔性部材３ｂは多数の微小細孔を形成
させたものであるから、ＣＴ値乃至Ｘ線吸収係数はパー
シャルボリウム効果により低くなり、より肺実質部に近
似させることができるようになり、このことからそのＣ
Ｔ値を例えば−９９０乃至−８００という値に設定する
ことができるようになる。尚、多孔性部材としては上記
ゴム材に限らず、例えば合成樹脂、天然素材等を用いる
ことができる。As mentioned above, since the porous member 3b has a large number of micropores formed therein, the CT value or X-ray absorption coefficient is lowered due to the partial volume effect, so that it can be more closely approximated to the lung parenchyma. From this, the C
It becomes possible to set the T value to a value of -990 to -800, for example. Note that the porous member is not limited to the above-mentioned rubber material, and for example, synthetic resins, natural materials, etc. can be used.
第２図は本発明ファントムの他の実施例の外観斜視図で
ある。FIG. 2 is an external perspective view of another embodiment of the phantom of the present invention.
同図に示すファントム５と第１図に示すファントムの相
違点は、外枠体６の有無にある。図示外枠体６はＸ線吸
収率の比較的大きな部材例えば前述したアクリル樹脂を
リング状に形成させたものである。尚、この外枠体６も
Ｘ線吸収率の比較的大きな他の材質のものでもよい。The difference between the phantom 5 shown in the figure and the phantom shown in FIG. 1 lies in the presence or absence of the outer frame body 6. The illustrated outer frame 6 is formed into a ring shape using a member having a relatively high X-ray absorption rate, such as the aforementioned acrylic resin. Incidentally, this outer frame body 6 may also be made of another material having a relatively high X-ray absorption rate.
以上のように構成されたＸ線ＣＴ装置用ファントムの作
用、効果について、第３図を参照して説明する。尚、第
２図に示すファントムを用いても同様である。The functions and effects of the phantom for an X-ray CT apparatus configured as described above will be explained with reference to FIG. Incidentally, the same applies even if the phantom shown in FIG. 2 is used.
空気と多孔性部材３ｂとのＣＴ値を比較するために、該
多孔性部材３ｂと切欠部４の双方にそれぞれ関心領域Ｒ
ＯＩ ７．８を設定し、ＣＴ値の平均値を算出する。こ
の場合において、ｄｉｓｈｉｎｇ。In order to compare the CT values of air and the porous member 3b, regions of interest R are provided in both the porous member 3b and the notch 4, respectively.
Set the OI to 7.8 and calculate the average CT value. In this case, dishing.
ｃａｐｐ ｉ ｎｇ等、視野中央から離れるに従ってＣ
Ｔ値に変化があるのが通常でおるので、同じ程度のラジ
アル位置において測定する方が好ましい。この−〇 −
ために、前述したほぼ中心部から外周にかけて形成した
扇子状の切欠部４は有効でおる。また、多孔性部材３ｂ
に形成されている多数の細孔の形成率、該部材の材質を
変更することにより、容易にそのＣＴ ｌｉｉを変更す
ることもできる。capp i ng, etc., as the distance from the center of the visual field increases.
Since it is normal for the T value to vary, it is preferable to measure at the same radial position. For this reason, the fan-shaped notch 4 formed from approximately the center to the outer periphery is effective. Moreover, the porous member 3b
The CT lii can also be easily changed by changing the formation rate of the large number of pores formed in the member and the material of the member.
肺気腫と肺実質部とはＣＴ値で１００間くらいの差がほ
とんどであるが、小さな肺気腫（例えば１乃至２ｍｍの
球）は、通常のスキャン条件は５乃至’ｌＱｍｍに設定
されているためにパーシャルボリウム効果によりコント
ラストが著しく低下することになる。このような小さな
寸法の場合には、ＭＴＦの相当低下していることが考え
られるので特に前述した空気に近いＣＴ値を有する材質
としたファントムは重要な性能評価の要素となる。In most cases, the CT value difference between emphysema and the lung parenchyma is about 100, but small emphysema (for example, a sphere of 1 to 2 mm) can be partially detected because the normal scan conditions are set to 5 to 1Qmm. The contrast will be significantly reduced due to the volume effect. In the case of such a small size, the MTF is likely to be considerably reduced, so the phantom, which is made of a material having a CT value close to that of air, becomes an important element for performance evaluation.
このようにして、例えばコントラスト差甲ＨＵの穴が乙
０までｉ認できるというような定量的な性能表現をする
ことができるようになる。In this way, it becomes possible to quantitatively express the performance, for example, the holes in the contrast instep HU can be recognized up to 0.
ざらに、第２図に示すような外枠体６を備えたファント
ムによれば、実際の肺は胸壁に包囲されているので、こ
れによるＸ線の吸収を考慮した、より臨床の実態に近い
性能評価を行うことができるようになる。Roughly speaking, according to the phantom equipped with the outer frame body 6 as shown in Fig. 2, since the actual lungs are surrounded by the chest wall, the X-ray absorption due to this is taken into account, which is closer to the actual clinical situation. Performance evaluation will be possible.
尚、本発明は上記図示実施例に限定されず、その要旨の
範囲内で様々に変形実施できることは言うまでもない。It goes without saying that the present invention is not limited to the illustrated embodiments described above, and that various modifications can be made within the scope of the invention.
［発明の効果］
以上詳述したように本発明によると、多孔性部材のＣＴ
値を肺実質部に近似させることができるので、正確にそ
の画質評価を定量的に行えるＸ線ＣＴ装置用ファントム
の提供ができる。[Effects of the Invention] As detailed above, according to the present invention, CT of a porous member
Since the value can be approximated to that of the lung parenchyma, it is possible to provide a phantom for an X-ray CT apparatus that can accurately and quantitatively evaluate the image quality.
第１図は本発明の一実施例Ｘ線ＣＴ装置用ファントムの
斜視図、第２図はその他の実施例の斜視図、第３図は性
能評価の説明図、第４図及び第５図は従来のＸ線ＣＴ装
置用ファントムの正面図である。
３．５・・・Ｘ線ＣＴ装置用ファントム、３ａ・・・貫
通孔、３ｂ・・・多孔性部材。Fig. 1 is a perspective view of a phantom for an X-ray CT apparatus according to one embodiment of the present invention, Fig. 2 is a perspective view of another embodiment, Fig. 3 is an explanatory diagram of performance evaluation, and Figs. 4 and 5 are FIG. 2 is a front view of a conventional phantom for an X-ray CT apparatus. 3.5... Phantom for X-ray CT device, 3a... Through hole, 3b... Porous member.
Claims (6)
置用ファントムにおいて、該ファントムを多孔性部材か
ら形成したことを特徴とするＸ線ＣＴ装置用ファントム
。(1) A phantom for an X-ray CT device used for performance evaluation of an X-ray CT device, characterized in that the phantom is formed from a porous member.
で形成されているものである特許請求の範囲第１項記載
のＸ線ＣＴ装置用ファントム。(2) The phantom for an X-ray CT apparatus according to claim 1, wherein the porous member has through holes of a predetermined diameter formed at predetermined intervals.
請求の範囲第１項又は第２項に記載のＸ線ＣＴ装置用フ
ァントム。(3) The phantom for an X-ray CT apparatus according to claim 1 or 2, wherein the porous member is made of a rubber material.
するものである特許請求の範囲第１項乃至第２項のいづ
れかに記載のＸ線ＣＴ装置用ファントム。(4) The phantom for an X-ray CT apparatus according to any one of claims 1 to 2, wherein the porous member has a CT value corresponding to a lung parenchyma.
請求の範囲第１項乃至第４項のいづれかに記載のＸ線Ｃ
Ｔ装置用ファントム。(5) The X-ray C according to any one of claims 1 to 4, wherein the phantom is provided with an outer frame body.
Phantom for T device.
成された切欠部を有するものである特許請求の範囲第１
項乃至第５項のいづれかに記載のＸ線ＣＴ装置用ファン
トム。(6) Claim 1, wherein the phantom has a notch formed from approximately the center to the outer periphery.
The phantom for an X-ray CT apparatus according to any one of Items 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62098648A JPS63264044A (en) | 1987-04-23 | 1987-04-23 | Phantom for x-ray ct apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62098648A JPS63264044A (en) | 1987-04-23 | 1987-04-23 | Phantom for x-ray ct apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63264044A true JPS63264044A (en) | 1988-10-31 |
Family
ID=14225321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62098648A Pending JPS63264044A (en) | 1987-04-23 | 1987-04-23 | Phantom for x-ray ct apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63264044A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005017059A (en) * | 2003-06-25 | 2005-01-20 | Hitachi Ltd | X-ray ct system |
| JP2012189517A (en) * | 2011-03-13 | 2012-10-04 | National Institute Of Advanced Industrial & Technology | Standard gauge for calibration and evaluation of x-ray ct apparatus, and calibration method and evaluation method of x-ray ct apparatus using standard gauge for calibration and evaluation of x-ray ct apparatus |
| JP2013132422A (en) * | 2011-12-27 | 2013-07-08 | Morita Mfg Co Ltd | Phantom for medical x-ray photographing device |
-
1987
- 1987-04-23 JP JP62098648A patent/JPS63264044A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005017059A (en) * | 2003-06-25 | 2005-01-20 | Hitachi Ltd | X-ray ct system |
| JP2012189517A (en) * | 2011-03-13 | 2012-10-04 | National Institute Of Advanced Industrial & Technology | Standard gauge for calibration and evaluation of x-ray ct apparatus, and calibration method and evaluation method of x-ray ct apparatus using standard gauge for calibration and evaluation of x-ray ct apparatus |
| JP2013132422A (en) * | 2011-12-27 | 2013-07-08 | Morita Mfg Co Ltd | Phantom for medical x-ray photographing device |
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