JPH0542130A - Phantom for calibration and data calibration method - Google Patents
Phantom for calibration and data calibration methodInfo
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- JPH0542130A JPH0542130A JP3200618A JP20061891A JPH0542130A JP H0542130 A JPH0542130 A JP H0542130A JP 3200618 A JP3200618 A JP 3200618A JP 20061891 A JP20061891 A JP 20061891A JP H0542130 A JPH0542130 A JP H0542130A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000005855 radiation Effects 0.000 claims abstract description 25
- 230000035945 sensitivity Effects 0.000 claims abstract description 17
- 210000000988 bone and bone Anatomy 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims description 12
- 239000004065 semiconductor Substances 0.000 claims description 9
- 238000011002 quantification Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 210000004872 soft tissue Anatomy 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 24
- 239000000463 material Substances 0.000 abstract description 16
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 abstract description 8
- 238000004445 quantitative analysis Methods 0.000 abstract 5
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000004069 differentiation Effects 0.000 abstract 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 229910004613 CdTe Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/58—Testing, adjusting or calibrating thereof
- A61B6/582—Calibration
- A61B6/583—Calibration using calibration phantoms
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- Apparatus For Radiation Diagnosis (AREA)
- Nuclear Medicine (AREA)
Abstract
Description
【０００１】[0001]
【産業用の利用分野】本発明は、医療用Ｘ線診断装置、
骨塩定量装置、非破壊検査装置、Ｘ線分析装置等に使用
する校正用ファントムおよびデータ校正法関するもので
ある。BACKGROUND OF THE INVENTION The present invention relates to a medical X-ray diagnostic apparatus,
The present invention relates to a calibration phantom and a data calibration method used for a bone mineral quantification device, a nondestructive inspection device, an X-ray analysis device, and the like.
【０００２】[0002]
【従来の技術】複数の放射線検出素子を用いた放射線計
測機器においては、一般に計測開始前に、素子間の感度
ばらつきを知るために、一度、実際の測定対象にちかい
校正用ファントムの計測を行い、その各検出素子素子の
放射線強度を示す値から、演算装置により素子間の補正
係数を得る。その後、実際の計測を行い、そこで得た各
素子の放射線強度を示す値に補正係数を乗算して測定結
果とする。2. Description of the Related Art In a radiation measuring device using a plurality of radiation detecting elements, in general, a calibration phantom, which is close to an actual object to be measured, is measured once in order to know sensitivity variations between the elements before starting measurement. From the value indicating the radiation intensity of each detection element, the correction coefficient between the elements is obtained by the arithmetic unit. After that, actual measurement is performed, and the value indicating the radiation intensity of each element obtained there is multiplied by the correction coefficient to obtain the measurement result.
【０００３】この放射線検出素子の感度補正を行なう際
の校正用ファントムは、測定する範囲において、放射線
に対する吸収が均一な素材により作成されている。たと
えば、図４に示す校正用ファントム５は、厚さが一定の
アクリル板が用いられる。The calibration phantom for correcting the sensitivity of the radiation detecting element is made of a material having a uniform absorption of radiation in the measuring range. For example, the calibration phantom 5 shown in FIG. 4 uses an acrylic plate having a constant thickness.
【０００４】また、放射線と放射線検出器からなる物質
の定量装置においては、測定した定量値の正確度を再現
性よく得るために、測定開始前に含有量が既知のファン
トムの測定を行ない測定値の校正係数を算出している。Further, in a quantitative device for a substance consisting of radiation and a radiation detector, in order to obtain the accuracy of the measured quantitative value with good reproducibility, a phantom of which the content is known is measured before starting the measurement. The calibration coefficient of is calculated.
【０００５】[0005]
【発明が解決しようとする課題】多数の放射線検出素子
を用いた定量装置では、放射線検出素子間の感度補正を
行なうための測定と、測定値の校正係数を得るための測
定を行なわなければならず、測定対象の計測を行なう前
に、少なくとも２度の測定操作を行なわなければならな
い。In a quantification device using a large number of radiation detecting elements, it is necessary to perform a measurement for correcting the sensitivity between the radiation detecting elements and a measurement for obtaining a calibration coefficient of the measured value. First, the measurement operation must be performed at least twice before the measurement of the measurement target.
【０００６】[0006]
【課題を解決するための手段】測定対象となる物質を少
なくとも一部に含む校正用ファントムを用いる。このフ
ァントムを測定し、放射線検出素子間の感度補正係数
と、測定密度の校正係数を同時に算出する。A calibration phantom including at least a part of a substance to be measured is used. This phantom is measured, and the sensitivity correction coefficient between the radiation detection elements and the calibration coefficient of the measurement density are calculated at the same time.
【０００７】[0007]
【作用】この手段により、１回の測定で、放射線検出素
子間の感度補正係数と、測定密度の校正係数を同時に得
ることができる。By this means, the sensitivity correction coefficient between the radiation detecting elements and the calibration coefficient of the measurement density can be simultaneously obtained by one measurement.
【０００８】また、含有量の大小に対する直線性の校正
も、１回の測定のみで精度よく行なうことができる。Further, the calibration of the linearity with respect to the amount of the content can be accurately performed by only one measurement.
【０００９】[0009]
【実施例】以下に本発明を実施例にもとづき説明する。EXAMPLES The present invention will be described below based on examples.
【００１０】（実施例１）図１は、本発明の校正用ファ
ントムの一実施例の外観図である。本実施例の校正用フ
ァントムは、人骨中のＣａやＰを主とするミネラル量を
定量する際に用いられる。本実施例では、簡単のため、
Ｃａ定量に限って説明する。厚さ１２cmのアクリル板１
の中央部に厚さ１cmの骨等価ファントム２をはめ込んだ
ものである。アクリル板の60keVのγ線に対する質量減
弱係数は、0.190cm2／cmであり、骨等価ファントム２は
人骨にほぼ等しい成分組成を有するもので、質量減弱係
数は、0.274cm2／gである。骨等価ファントム中には、
Ｃａを含有しており、そのＣａ含有量ＤCaFは1.0g／cm3
である。一方、アクリル中にはＣａは含まれておらず、
人体の軟組織とほぼ等しい減弱係数をもつ。(Embodiment 1) FIG. 1 is an external view of an embodiment of a calibration phantom of the present invention. The calibration phantom of this embodiment is used when quantifying the amount of minerals mainly containing Ca and P in human bones. In this embodiment, for simplicity,
Only Ca quantification will be described. 12 cm thick acrylic plate 1
The bone-equivalent phantom 2 having a thickness of 1 cm is fitted in the central part of the. The mass attenuation coefficient for 60 keV γ-rays of the acrylic plate is 0.190 cm 2 / cm, the bone equivalent phantom 2 has a composition substantially equal to human bone, and the mass attenuation coefficient is 0.274 cm 2 / g. During the bone equivalent phantom,
Contains Ca, and its Ca content D CaF is 1.0 g / cm 3
Is. On the other hand, acrylic does not contain Ca,
It has an attenuation coefficient almost equal to that of the soft tissue of the human body.
【００１１】この校正用ファントム５を用い、測定デー
タの校正を以下のように行った。密度測定装置は、図２
に示すように、Ｘ線発生装置３とＣｄＴｅを用いた５１
２個のチャンネル７からなる多チャンネル型半導体Ｘ線
検出器４から構成される。Using this calibration phantom 5, the measurement data was calibrated as follows. The density measuring device is shown in FIG.
As shown in FIG. 5, 51 using the X-ray generator 3 and CdTe
It is composed of a multi-channel type semiconductor X-ray detector 4 consisting of two channels 7.
【００１２】測定対象をＸ線発生装置３と多チャンネル
型半導体Ｘ線検出器４の間に設置し、Ｘ線発生装置３と
多チャンネル型半導体Ｘ線検出器４を同期して走査する
ことにより、２次元の領域の測定を行う。多チャンネル
型半導体Ｘ線検出器４では、高エネルギーのＸ線強度と
低エネルギーのＸ線強度を同時に、別々に分離して計測
している。The object to be measured is placed between the X-ray generator 3 and the multi-channel type semiconductor X-ray detector 4, and the X-ray generator 3 and the multi-channel type semiconductor X-ray detector 4 are synchronously scanned. Measure a two-dimensional area. The multi-channel semiconductor X-ray detector 4 simultaneously measures the high-energy X-ray intensity and the low-energy X-ray intensity separately and separately.
【００１３】図１の校正用ファントム５を、骨等価ファ
ントム２部分を透過したＸ線６が多チャンネル型半導体
Ｘ線検出器４のすべてのチャンネル７で測定されるよう
に設置した。校正用ファントム５を測定したデータか
ら、半導体Ｘ線検出器のチャンネル間の感度補正係数と
定量値の校正係数を以下のように求めた。The calibration phantom 5 shown in FIG. 1 is installed so that the X-rays 6 transmitted through the bone equivalent phantom 2 can be measured in all channels 7 of the multi-channel type semiconductor X-ray detector 4. From the data obtained by measuring the calibration phantom 5, the sensitivity correction coefficient between the channels of the semiconductor X-ray detector and the calibration coefficient of the quantitative value were obtained as follows.
【００１４】まず、感度補正係数について説明する。ま
ず、高エネルギーＸ線の測定強度について行なう。各チ
ャンネルについて、走査を行なうことにより512個のデ
−タを得る。これにより得られた512×512全データの平
均値ＡＶを求める。ｎ番目のチャンネルのｍラインのＸ
線強度をＣn（ｍ）とする。Ｃn（１）からＣn（５１
２）までの５１２個のデータの平均値Ｃnａｖを計算
し、各チャンネルごとに補正係数ＣnＨを（数１）とし
て求めた。First, the sensitivity correction coefficient will be described. First, the measurement intensity of high energy X-rays is performed. By scanning each channel, 512 data are obtained. The average value AV of all the 512 × 512 data thus obtained is obtained. X on the m line of the nth channel
The line intensity is C n (m). From C n (1) to C n (51
The average value C n av of 512 data up to 2) was calculated, and the correction coefficient C n H was calculated as (Equation 1) for each channel.
【００１５】[0015]
【数１】 [Equation 1]
【００１６】これを低エネルギーＸ線の測定強度につい
ても行った。測定した領域の走査方向については、骨等
価ファントムが含まれるため、従来のように同一の材料
を測定した場合とはことなるが、各チャンネルは常に同
じ材料を測定しているためこの方法が可能である。This was also performed on the measurement intensity of low energy X-rays. Regarding the scanning direction of the measured area, since the bone equivalent phantom is included, it is different from the case of measuring the same material as before, but this method is possible because each channel always measures the same material. Is.
【００１７】次に、校正用ファントム内の骨等価ファン
トムのＣａの単位面積あたりの密度を算出した。骨等価
ファントム部を透過した高エネルギーＸ線強度、低エネ
ルギーＸ線強度それぞれについて、平均値を計算した。
また、アクリル部のデータについても同様に平均値を算
出した。この結果を４つの測定値を用い、エネルギー差
分法にもとづき、骨等価ファントム内の単位面積あたり
のＣａ密度ＤCaHを計算した。これより、測定密度の校
正係数Ｄは、（数２）により得た。Next, the density per unit area of Ca of the bone equivalent phantom in the calibration phantom was calculated. An average value was calculated for each of the high-energy X-ray intensity and the low-energy X-ray intensity transmitted through the bone equivalent phantom part.
Moreover, the average value was similarly calculated also about the data of an acrylic part. The Ca density D CaH per unit area in the bone-equivalent phantom was calculated based on the energy difference method using the four measured values. From this, the calibration coefficient D of the measured density was obtained by (Equation 2).
【００１８】[0018]
【数２】 [Equation 2]
【００１９】校正用ファントムに代えて、測定対象を設
置し、同様に測定した。チャンネル間の感度ばらつきを
補正するため、ｎチャンネルの各ラインのＸ線強度測定
値にチャンネル間感度補正係数ＣnＨを乗算する。Instead of the calibration phantom, an object to be measured was set and the same measurement was performed. In order to correct the sensitivity variation between channels, the X-ray intensity measurement value of each line of the n channel is multiplied by the interchannel sensitivity correction coefficient C n H.
【００２０】この感度補正を行なったデータを用い、測
定対象中のＣａ密度を算出する。計算の方法は、校正係
数を求める場合と同様であり、エネルギー差分法を用い
る。得られたＣａ密度ＤCamに、校正係数Ｄを乗じた値
Ｄ×ＤCamを測定対象のＣａ密度とした。The Ca density in the measurement object is calculated using the data obtained by this sensitivity correction. The calculation method is the same as that for obtaining the calibration coefficient, and the energy difference method is used. A value D × D Cam obtained by multiplying the obtained Ca density D Cam by the calibration coefficient D was taken as the Ca density to be measured.
【００２１】以上の方法により、１回の事前の測定によ
り、感度補正と測定密度の校正が行うことができた。According to the above method, the sensitivity correction and the calibration of the measurement density could be carried out by one preliminary measurement.
【００２２】（実施例２）図３に、本発明の校正用ファ
ントムの他の実施例の外観図である。アクリル板の校正
用ファントム５の２カ所に、単位体積当りのＣａ量は同
じファントム材料１１、１２、を厚さを変えて設けたも
のである。ファントム材料１２はファントム材料１１の
１／２の厚さとしたため、単位面積あたりのＣａ量も１
／２となる。これらのファントム材料１１、１２のＣａ
量は、Ｄca11、Ｄca12で、ともに既知である。(Embodiment 2) FIG. 3 is an external view of another embodiment of the calibration phantom of the present invention. Phantom materials 11 and 12 having the same amount of Ca per unit volume are provided at two locations on an acrylic plate calibrating phantom 5 with different thicknesses. Since the phantom material 12 has a thickness half that of the phantom material 11, the amount of Ca per unit area is also 1
/ 2. Ca of these phantom materials 11 and 12
The amounts are D ca11 and D ca12 , both of which are known.
【００２３】実施例１と同様に、多チャンネル型Ｘ線検
出器のすべてのチャンネルを覆うように設計されてい
る。Like the first embodiment, the multi-channel X-ray detector is designed to cover all the channels.
【００２４】この校正用ファントムを実施例１と同様
に、測定してチャンネル間の感度補正係数をＣnＨを求
めた。This calibration phantom was measured in the same manner as in Example 1 to determine the sensitivity correction coefficient C n H between channels.
【００２５】次に、ファントム材料１１、１２の単位面
積当りのＣａ密度を同じく、エネルギー差分法をもとに
求めた。算出されたファントム材料１１、１２のＣａ密
度をそれぞれＤCaH11、ＤCaH12とする。この２つのＣａ
密度から、その日の密度定量装置の密度に対する直線性
をも考慮した校正式（数３）を得る。Next, the Ca densities per unit area of the phantom materials 11 and 12 were similarly obtained by the energy difference method. The calculated Ca densities of the phantom materials 11 and 12 are D CaH11 and D CaH12 , respectively. These two Ca
From the density, a calibration formula (Equation 3) that takes linearity with respect to the density of the density quantification device on that day into consideration is obtained.
【００２６】[0026]
【数３】 [Equation 3]
【００２７】ここで、（数３）において、ｙは校正され
たＣａ密度、Ｄcam は測定した密度、ｋは比例定数、Ｄ
0 は定数である。ｋ、Ｄ0 は、それぞれ（数４）、（数
５）である。Here, in (Equation 3), y is a calibrated Ca density, D cam is a measured density, k is a proportional constant, and D is a proportional constant.
0 is a constant. k and D 0 are (Equation 4) and (Equation 5), respectively.
【００２８】[0028]
【数４】 [Equation 4]
【００２９】[0029]
【数５】 [Equation 5]
【００３０】以上により、測定値Ｄcam を（数３）にし
たがい、より精度よく校正できる。本実施例では、校正
ファントム中のファントム材料を厚さの異なる２種類と
したが、３種類以上の厚さのファントム材料で構成して
もよい。この場合も、同様に最小２乗法などにより、
（数３）のような校正式をもとめ、密度に対する直線性
のよい校正を行なうことができる。As described above, according to the measured value D cam (Equation 3), it is possible to calibrate more accurately. In the present embodiment, the phantom materials in the calibration phantom are of two types having different thicknesses, but may be composed of phantom materials of three or more types of thickness. Also in this case, the least squares method, etc.
Based on a calibration formula such as (Equation 3), it is possible to perform calibration with good linearity with respect to density.
【００３１】また、校正用ファントム内のＣａ含有ファ
ントム材料は、厚さを一定にしＣａ含有量の異なるもの
を使用してもよい。Further, as the Ca-containing phantom material in the calibration phantom, those having a constant thickness and different Ca contents may be used.
【００３２】本実施例の方法は、Ｃａ以外の元素につい
ても、密度または厚さのことなる材料で構成したファン
トムにより、同様に行える。また、複数の元素の密度の
和や、化合物密度についても実施可能である。The method of this embodiment can be similarly performed for elements other than Ca by using a phantom composed of materials having different densities or thicknesses. Further, the sum of the densities of a plurality of elements and the compound density can also be implemented.
【００３３】多チャンネル型Ｘ線検出器としては、半導
体Ｘ線検出器のほかにタングステン酸カドミウムにより
構成されたシンチレーション検出器を多数配列したもの
を用いることも可能である。As the multi-channel X-ray detector, in addition to the semiconductor X-ray detector, it is also possible to use an array of a large number of scintillation detectors made of cadmium tungstate.
【００３４】また、実施例１のように、検出器にＸ線エ
ネルギーを識別して計測することができない場合には、
Ｘ線管の管電圧を切り替えて、エネルギースペクトルを
変化させることによっても可能である。When the detector cannot discriminate and measure X-ray energy as in the first embodiment,
It is also possible by changing the tube voltage of the X-ray tube to change the energy spectrum.
【００３５】[0035]
【発明の効果】本実施例の校正用ファントムおよびデー
タ校正法を用いることにより、多チャンネル放射線検出
器のチャンネル感度補正と、測定密度の校正が同時に行
えるため、事前の測定が１回で容易に行なうことができ
た。By using the calibration phantom and the data calibration method of this embodiment, the channel sensitivity correction of the multi-channel radiation detector and the calibration of the measurement density can be performed at the same time, so that the preliminary measurement can be easily performed once. I was able to do it.
【００３６】また、測定密度の直線性をも良好に校正す
ることができた。Also, the linearity of the measured density could be calibrated well.
【図１】本発明の校正用ファントムの一実施例の外観図FIG. 1 is an external view of an embodiment of a calibration phantom of the present invention.
【図２】図１の実施例の校正用ファントムを用いた定量
装置の構成図FIG. 2 is a block diagram of a quantification device using the calibration phantom of the embodiment of FIG.
【図３】本発明の校正用ファントムの他の実施例の外観
図FIG. 3 is an external view of another embodiment of the calibration phantom of the present invention.
【図４】従来の校正用ファントムの外観図FIG. 4 is an external view of a conventional calibration phantom.
１ アクリル板 ２ 骨等価ファントム ３ Ｘ線発生装置 ４ 多チャンネル型半導体Ｘ線検出器 ５ 校正用ファントム ６ Ｘ線 １１ ファントム材料 １２ ファントム材料 DESCRIPTION OF SYMBOLS 1 Acrylic plate 2 Bone equivalent phantom 3 X-ray generator 4 Multi-channel semiconductor X-ray detector 5 Calibration phantom 6 X-ray 11 Phantom material 12 Phantom material
───────────────────────────────────────────────────── フロントページの続き (72)発明者 筒井 博司 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroshi Tsutsui 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.
Claims (5)
る物質の定量を行なう装置に用いる校正用ファントムで
あって、定量しようとする物質をすくなくとも１カ所に
含有することを特徴とする校正用ファントム。1. A calibration phantom for use in an apparatus for quantifying a substance consisting of a radiation source and a plurality of radiation detection elements, wherein the substance to be quantified is contained in at least one place. ..
り、それが軟組織等価物質の１カ所に含有された請求項
１記載の校正用ファントム。2. The calibration phantom according to claim 1, wherein the substance to be quantified is a bone equivalent substance, and the substance is contained in one site of the soft tissue equivalent substance.
る物質の定量装置において、校正用ファントムを測定す
ることにより、前記放射線検出素子間の感度補正と、測
定した物質の定量値の校正を同時に行なうことを特徴と
するデータ校正法。3. In a quantification device for a substance comprising a radiation source and a plurality of radiation detection elements, by measuring a calibration phantom, sensitivity correction between the radiation detection elements and calibration of a quantitative value of the measured substance are performed at the same time. A data calibration method characterized by performing.
の含有量の異なる部分を２カ所以上含み、前記校正用フ
ァントムを測定することにより、定量値の物質の含有量
に対する直線性の校正を行なうことを特徴とするデータ
校正法。4. The calibration phantom includes two or more portions having different contents of the substance to be measured, and the calibration phantom is measured to calibrate the linearity with respect to the substance content of the quantitative value. A data proofing method characterized in that
子が、多チャンネル型半導体放射線検出器よりなること
を特徴とする請求項３または４記載のデータ校正法。5. The data calibrating method according to claim 3, wherein the radiation source is an X-ray tube, and the radiation detecting element is a multi-channel semiconductor radiation detector.
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| JP3200618A JP3030950B2 (en) | 1991-08-09 | 1991-08-09 | Calibration phantom and data calibration method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3200618A JP3030950B2 (en) | 1991-08-09 | 1991-08-09 | Calibration phantom and data calibration method |
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| JPH0542130A true JPH0542130A (en) | 1993-02-23 |
| JP3030950B2 JP3030950B2 (en) | 2000-04-10 |
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ID=16427375
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3200618A Expired - Fee Related JP3030950B2 (en) | 1991-08-09 | 1991-08-09 | Calibration phantom and data calibration method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000057786A1 (en) | 1999-03-29 | 2000-10-05 | Matsushita Electric Industrial Co., Ltd. | X-ray camera |
| KR20040051938A (en) * | 2002-12-13 | 2004-06-19 | 한국전자통신연구원 | Method for calibrating bone mineral density index variation and storage medium for storing program of executing the same |
| JP2006141905A (en) * | 2004-11-25 | 2006-06-08 | Hitachi Medical Corp | X-ray radiographing apparatus |
| CN109788926A (en) * | 2016-09-22 | 2019-05-21 | 通用电气公司 | The spectroscopic calibration of spectrum computed tomography (CT) |
-
1991
- 1991-08-09 JP JP3200618A patent/JP3030950B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000057786A1 (en) | 1999-03-29 | 2000-10-05 | Matsushita Electric Industrial Co., Ltd. | X-ray camera |
| US6748049B1 (en) | 1999-03-29 | 2004-06-08 | Matsushita Electric Industrial Co., Ltd. | X-ray camera |
| KR20040051938A (en) * | 2002-12-13 | 2004-06-19 | 한국전자통신연구원 | Method for calibrating bone mineral density index variation and storage medium for storing program of executing the same |
| JP2006141905A (en) * | 2004-11-25 | 2006-06-08 | Hitachi Medical Corp | X-ray radiographing apparatus |
| CN109788926A (en) * | 2016-09-22 | 2019-05-21 | 通用电气公司 | The spectroscopic calibration of spectrum computed tomography (CT) |
| JP2019532699A (en) * | 2016-09-22 | 2019-11-14 | ゼネラル・エレクトリック・カンパニイ | Spectral computer tomography (CT) spectral calibration |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3030950B2 (en) | 2000-04-10 |
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