JP5016971B2 - Body fat percentage acquisition method - Google Patents
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- 210000000577 adipose tissue Anatomy 0.000 title claims description 163
- 238000000034 method Methods 0.000 title claims description 40
- 210000004185 liver Anatomy 0.000 claims description 11
- 210000001596 intra-abdominal fat Anatomy 0.000 claims description 10
- 238000003325 tomography Methods 0.000 claims description 9
- 210000004003 subcutaneous fat Anatomy 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 8
- 230000037396 body weight Effects 0.000 description 4
- 210000000056 organ Anatomy 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 210000003689 pubic bone Anatomy 0.000 description 2
- 210000001562 sternum Anatomy 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 108091027582 RsmX Proteins 0.000 description 1
- 210000001621 ilium bone Anatomy 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 210000001835 viscera Anatomy 0.000 description 1
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本発明は体脂肪率取得方法に関し、詳しくは、人体の断面画像から体脂肪率を取得する体脂肪率取得方法に関するものである。 The present invention relates to a body fat percentage acquisition method, and more particularly to a body fat percentage acquisition method for acquiring a body fat percentage from a cross-sectional image of a human body.
従来より、体重に占める脂肪の重さの割合を示す体脂肪率を測定する種々の方式が知られている。 Conventionally, various methods for measuring the body fat percentage indicating the proportion of the weight of fat in the body weight are known.
上記体脂肪率を求める方式としては、例えば、人体を水中に沈めて、水中での体重と陸上での体重との違いを測定する水中体重法により得られた人体の体密度から体脂肪率を推定する方式が知られている。 As a method for obtaining the body fat percentage, for example, the body fat percentage is calculated from the body density of the human body obtained by the underwater body weight method in which the human body is submerged in water and the difference between the weight in water and the weight on land is measured. An estimation method is known.
また、人体に微小電流を流したときの電気抵抗を測定し、この電気抵抗が人体を構成する体脂肪の量に応じて変化することを利用して体脂肪率を推定するインピーダンス法も知られている。 There is also an impedance method that measures the electrical resistance when a minute current is passed through the human body and estimates the body fat percentage using the fact that this electrical resistance changes according to the amount of body fat that constitutes the human body. ing.
上記体脂肪率の測定における脂肪は内臓脂肪と皮下脂肪とを含むものであるが、上記体脂肪の一部である内臓脂肪の比率を推定する方式も知られている（特許文献１参照）。この方式は、Ｘ線ＣＴを用いた人体の断層撮影により、内臓脂肪を示す領域の境界を明確に識別できるようにした断面画像を得、この断面画像中の内臓脂肪を示す領域の面積と他の領域との面積の比率を求めて内臓脂肪率を推定するものである。上記方式では、例えば人体のへそを通る１枚の断面画像から内臓脂肪率を推定しており、この方式は人体のへそを通る１枚の断面画像からの体脂肪率の推定にも適用することができる。 The fat in the measurement of the body fat percentage includes visceral fat and subcutaneous fat, but a method for estimating the ratio of visceral fat that is a part of the body fat is also known (see Patent Document 1). This method obtains a cross-sectional image in which the boundary of a region showing visceral fat can be clearly identified by tomography of a human body using X-ray CT, and the area of the region showing visceral fat in this cross-sectional image and other areas. The visceral fat percentage is estimated by obtaining the ratio of the area to the region. In the above method, for example, the visceral fat rate is estimated from one cross-sectional image passing through the human navel, and this method is also applied to the estimation of the body fat rate from one cross-sectional image passing through the human navel. Can do.
上記のように、体脂肪率は、直接測定することが困難なので、間接的に得られた種々の測定データから推定して求めている。
ところで、上記人体のへそを通る断層撮影による体脂肪率の推定は、撮影する断面を容易に定めることができる点では優れているが、へそと内臓との位置関係、あるいは、皮下脂肪や内臓脂肪が堆積しやすい部位とへそとの位置関係には個人差がある。そのため、へそを通る断面画像中の体脂肪を示す領域の面積の割合から求めた体脂肪率は、上記水中体重法に比して大きな誤差が生じることがあり、そのような誤差を抑制したいという要請がある。 By the way, the estimation of body fat percentage by tomography through the navel of the human body is excellent in that the cross section to be imaged can be easily determined, but the positional relationship between the navel and the viscera, or subcutaneous fat and visceral fat There is an individual difference in the positional relationship between the site where the water is easily deposited and the navel. Therefore, the body fat percentage obtained from the ratio of the area of the body fat in the cross-sectional image passing through the navel may cause a large error compared to the underwater body weight method, and it is said that such an error is to be suppressed. There is a request.
本発明は、上記事情に鑑みてなされたものであり、より正確な体脂肪率を取得することができる体脂肪率取得方法を提供することを目的とするものである。 This invention is made | formed in view of the said situation, and aims at providing the body fat rate acquisition method which can acquire a more exact body fat rate.
本発明の第１の体脂肪率取得方法は、人体の体脂肪率を取得する体脂肪率取得方法であって、被検者について、肝臓上部辺縁、横隔膜下部、脊椎の椎間のうちのいずれかを通る断面と腸骨上部、腸骨下部、仙骨下部のうちのいずれかを通る断面との間を通る互に異なる断面を示す２種類以上の断面画像を用意し、各断面画像について、断面を示す領域の面積に対するこの断面内の体脂肪を示す領域の面積の比率を得、各断面画像毎に求めた前記比率のうちの最大値を求め、この最大値を、複数の互いに異なる人体について予め求めておいた体脂肪面積比率の最大値と体脂肪率との相関関係に適用して被検者の体脂肪率を取得するものである。 A first body fat percentage acquisition method of the present invention is a body fat percentage acquisition method for acquiring a body fat percentage of a human body, and includes a subject having an upper liver margin, a lower diaphragm, and a spinal vertebra. Prepare two or more types of cross-sectional images showing different cross-sections passing between the cross-section passing through any of the cross-section passing through either the upper iliac, the lower iliac, or the lower sacrum, The ratio of the area of the region showing the body fat in the cross section to the area of the region showing the cross section is obtained, the maximum value of the ratios obtained for each cross-sectional image is obtained, and the maximum value is obtained from a plurality of different human bodies. Is applied to the correlation between the maximum value of the body fat area ratio obtained in advance and the body fat percentage, and the body fat percentage of the subject is acquired.
すなわち、上記第１の体脂肪率取得方法は、人体の体脂肪率を取得する体脂肪率取得方法であって、被検者について、肝臓上部辺縁、横隔膜下部、脊椎の椎間のうちのいずれかを通る断面と、腸骨上部、腸骨下部、仙骨下部のうちのいずれかを通る断面との間を通る互に異なる断面を示す２種類以上の断面画像を用意し、各断面画像について、人体部位の断面を示す領域の面積に対するこの人体部位を示す断面内の体脂肪を示す領域の面積の比率である体脂肪面積比率を得、各断面画像毎に求めた上記体脂肪面積比率のうちの最大値を求め、この体脂肪面積比率の最大値を、複数の互いに異なる人体について予め求めておいた体脂肪面積比率の最大値と体脂肪率との相関関係に適用して前記被検者の体脂肪率を取得することを特徴とするものである。 That is, the first body fat percentage acquisition method is a body fat percentage acquisition method for acquiring a body fat percentage of a human body, and for a subject, among the upper margin of the liver, the lower diaphragm, and the spinal vertebrae. Prepare two or more types of cross-sectional images that show different cross-sections that pass between any one of the cross-sections that pass through one of the upper iliac, lower iliac, and lower sacrum. The body fat area ratio, which is the ratio of the area of the body fat area in the cross section showing the human body part to the area of the human body part cross section, The maximum value of the body fat area ratio is obtained and the maximum value of the body fat area ratio is applied to the correlation between the body fat area ratio and the maximum body fat area ratio obtained in advance for a plurality of different human bodies. Characterized by obtaining the body fat percentage of the elderly A.
本発明の第２の体脂肪率取得方法は、人体の体脂肪率を取得する体脂肪率取得方法であって、被検者について、肝臓上部辺縁、横隔膜下部、脊椎の椎間のうちのいずれかを通る断面と腸骨上部、腸骨下部、仙骨下部のうちのいずれかを通る断面との間を通る互に異なる断面を示す２種類以上の断面画像を用意し、各断面画像に基づいて、該断面画像間の領域の体積と該断面画像間の体脂肪の占める体積とを求め、前記領域の体積に対する前記体脂肪の体積の比率を示す脂肪体積比率を得、この脂肪体積比率を、複数の互いに異なる人体について予め求めておいた脂肪体積比率と体脂肪率との相関関係に適用して前記被検者の体脂肪率を取得することを特徴とするものである。 A second body fat percentage acquisition method of the present invention is a body fat percentage acquisition method for acquiring a body fat percentage of a human body, and includes a subject having an upper liver margin, a lower diaphragm, and a spinal vertebra. Prepare two or more types of cross-sectional images that show different cross-sections that pass between any one of the cross-sections passing through one of the upper iliac, lower iliac, and lower sacrum. The volume of the region between the cross-sectional images and the volume occupied by the body fat between the cross-sectional images are obtained to obtain a fat volume ratio indicating the ratio of the volume of the body fat to the volume of the region, and the fat volume ratio The body fat percentage of the subject is obtained by applying to the correlation between the fat volume ratio and the body fat percentage obtained in advance for a plurality of different human bodies.
すなわち、上記第２の体脂肪率取得方法は、人体の体脂肪率を取得する体脂肪率取得方法であって、被検者について、肝臓上部辺縁、横隔膜下部、脊椎の椎間のうちのいずれかを通る断面と、腸骨上部、腸骨下部、仙骨下部のうちのいずれかを通る断面との間を通る互に異なる断面を示す２種類以上の断面画像を用意し、各断面画像に基づいて、該断面画像間の人体部位を示す領域の体積と該断面画像間の人体部位中の体脂肪を示す領域の体積とを求め、前記人体部位を示す領域の体積に対する前記体脂肪の領域を示す体積の比率を示す脂肪体積比率を得、この脂肪体積比率を、複数の互いに異なる人体について予め求めておいた脂肪体積比率と体脂肪率との相関関係に適用して前記被検者の体脂肪率を取得することを特徴とするものである。 That is, the second body fat percentage acquisition method is a body fat percentage acquisition method for acquiring a body fat percentage of a human body, and for a subject, among the upper margin of the liver, the lower diaphragm, and the intervertebral vertebrae. Prepare two or more types of cross-sectional images that show different cross-sections that pass between any one of the cross-sections that pass through any of the upper iliac, lower iliac, and lower sacrum. Based on the volume of the region showing the human body part between the cross-sectional images and the volume of the region showing the body fat in the human body part between the cross-sectional images, the body fat region relative to the volume of the region showing the human body part A fat volume ratio indicating a ratio of the volume indicating the volume of the subject, and applying the fat volume ratio to the correlation between the fat volume ratio and the body fat ratio determined in advance for a plurality of different human bodies. It is characterized by acquiring body fat percentage
前記脂肪体積比率は、各断面画像の領域の面積を積算した値に対する各断面画像の領域中の体脂肪の占める面積を積算した値の比率によって求められるもとすることができる。 前記断面画像に基づいて求められる各体積は、各断面画像間の領域の補間によって求められるものとすることができる。 The fat volume ratio can be obtained by a ratio of a value obtained by integrating an area occupied by body fat in each cross-sectional image region to a value obtained by integrating the areas of the cross-sectional image regions. Each volume obtained on the basis of the cross-sectional image can be obtained by interpolation of a region between the cross-sectional images.
前記補間に用いられる関数の次数は１以上とすることができる。 前記断面画像は、Ｘ線ＣＴによる断層撮影で得られたものとすることができる。 The order of the function used for the interpolation can be 1 or more. The cross-sectional image may be obtained by tomography by X-ray CT.
前記体脂肪は、内臓脂肪と皮下脂肪とを合わせたものである。 The body fat is a combination of visceral fat and subcutaneous fat.
前記肝臓上部辺縁を通る断面、横隔膜下部を通る断面、脊椎の椎間を通る断面、腸骨上部を通る断面、腸骨下部を通る断面、仙骨下部を通る断面は、それぞれ被検者の背骨の伸びる方向に対して垂直な断面である。なお、前記被検者の背骨の伸びる方向は、被検者の身長方向でもある。 The cross section passing through the upper margin of the liver, the cross section passing through the lower diaphragm, the cross section passing through the vertebrae of the spine, the cross section passing through the upper iliac, the cross section passing through the lower iliac, and the cross section passing through the lower sacrum, respectively. It is a cross section perpendicular | vertical with respect to the extending direction. The direction in which the spine of the subject extends is also the height direction of the subject.
前記補間に用いられる関数は、前記被検者の背骨の伸びる方向に対して平行な平面座標上において規定される関数とすることが望ましい。 The function used for the interpolation is preferably a function defined on a plane coordinate parallel to the direction in which the spine of the subject extends.
本発明の第１の体脂肪率取得方法によれば、被検者について用意した、２種類以上の各断面画像について、人体部位の断面を示す領域の面積に対するこの人体部位を示す断面内の体脂肪を示す領域の面積の比率である体脂肪面積比率を得、各断面画像毎に求めた体脂肪面積比率のうちの最大値を求め、この体脂肪面積比率の最大値を、複数の互いに異なる人体について予め求めておいた体脂肪面積比率の最大値と体脂肪率との相関関係に適用して前記被検者の体脂肪率を取得するようにしたので、より正確な体脂肪率を取得することができる。 According to the first method for obtaining body fat percentage of the present invention, for each of two or more types of cross-sectional images prepared for a subject, the body in the cross section showing the human body part relative to the area of the region showing the cross section of the human body part A body fat area ratio, which is a ratio of the area of fat, is obtained, a maximum value of the body fat area ratio obtained for each cross-sectional image is obtained, and the maximum value of the body fat area ratio is different from each other by a plurality of values. Since the body fat percentage of the subject is obtained by applying the correlation between the maximum body fat area ratio and the body fat percentage obtained in advance for the human body, a more accurate body fat percentage is obtained. can do.
すなわち、人体の１断面から推定した体脂肪率は、上記のように、脂肪の付き方や臓器位置の個人差等のため体脂肪面積比率と体脂肪率との間の相関は比較的低いものとなる。一方、上記体脂肪率取得方法では、人体の互に異なる２種類以上の各断面について求めた体脂肪面積比率のうちの最大値から体脂肪率を推定するので、すなわち、人体断面のうち、体脂肪の割合がより大きい断面から求めた体脂肪面積比率から体脂肪率を推定するので、上記脂肪の付き方や臓器位置の個人差を低減することができ、上記人体の１断面を用いる場合に比して体脂肪面積比率と体脂肪率との間の相関を高めることができる。 That is, the body fat percentage estimated from one cross section of the human body has a relatively low correlation between the body fat area ratio and the body fat percentage due to individual differences in fat attachment and organ position, as described above. It becomes. On the other hand, in the body fat percentage acquisition method, the body fat percentage is estimated from the maximum value of the body fat area ratios obtained for each of two or more different types of cross sections of the human body. Since the body fat percentage is estimated from the body fat area ratio obtained from the cross section where the fat ratio is larger, it is possible to reduce individual differences in the way of fat attachment and organ position, and when using one cross section of the human body. In comparison, the correlation between the body fat area ratio and the body fat percentage can be increased.
言い換えれば、上記発明における体脂肪面積比率の最大値と体脂肪率との間の相関係数の絶対値を従来よりも大きくすることができる。 In other words, the absolute value of the correlation coefficient between the maximum body fat area ratio and the body fat percentage in the above invention can be made larger than before.
上記のことにより、従来の人体の１断面から体脂肪率を求める方式よりも正確な体脂肪率を取得することができる。 As described above, it is possible to acquire a body fat percentage that is more accurate than the conventional method of obtaining the body fat percentage from one cross section of the human body.
本発明の第２の体脂肪率取得方法によれば、被験者について用意した、２種類以上の各断面画像に基づいて、断面画像間の人体部位を示す領域の体積とこの断面画像間の人体部位中の体脂肪を示す領域の体積とを求め、人体部位を示す領域の体積に対する体脂肪を示す領域の体積の比率を表す脂肪体積比率を得、この脂肪体積比率を、複数の互いに異なる人体について予め求めておいた脂肪体積比率と体脂肪率との相関関係に適用して前記被検者の体脂肪率を取得するようにしたので、より正確な体脂肪率を取得することができる。 According to the second body fat percentage acquisition method of the present invention, based on each of two or more types of cross-sectional images prepared for the subject, the volume of the region indicating the human body part between the cross-sectional images and the human body part between the cross-sectional images The volume of the region indicating the body fat is obtained, and a fat volume ratio representing the ratio of the volume of the region indicating the body fat to the volume of the region indicating the human body part is obtained, and this fat volume ratio is obtained for a plurality of different human bodies. Since the body fat percentage of the subject is obtained by applying to the correlation between the fat volume ratio and the body fat percentage obtained in advance, a more accurate body fat percentage can be obtained.
すなわち、人体の１断面から推定した体脂肪率は、上記のように、脂肪の付き方や臓器位置の個人差等のため脂肪体積比率と体脂肪率との間の相関は比較的低いものとなる。一方、上記体脂肪率取得方法では、人体の互に異なる２種類以上の各断面について求めた脂肪体積比率から体脂肪率を推定するので、すなわち、人体断面における体脂肪の割合をより平均化して示す上記脂肪体積比率から体脂肪率を推定するので、上記脂肪の付き方や臓器位置の個人差を低減することができ、上記人体の１断面を用いる場合に比して脂肪体積比率と体脂肪率との間の相関を高めることができる。 That is, the body fat percentage estimated from one cross section of the human body has a relatively low correlation between the fat volume ratio and the body fat percentage due to individual differences in how the fat is attached and organ positions, as described above. Become. On the other hand, in the body fat percentage acquisition method, since the body fat percentage is estimated from the fat volume ratio obtained for each of two or more different cross sections of the human body, that is, the body fat ratio in the human cross section is further averaged. Since the body fat percentage is estimated from the fat volume ratio shown, it is possible to reduce individual differences in the way of attaching the fat and organ position, and the fat volume ratio and the body fat compared to the case where one section of the human body is used. The correlation between rates can be increased.
言い換えれば、上記発明における脂肪体積比率と体脂肪率との間の相関係数の絶対値を従来よりも大きくすることができる。 In other words, the absolute value of the correlation coefficient between the fat volume ratio and the body fat percentage in the above invention can be made larger than before.
上記のことにより、従来の人体の１断面から体脂肪率を求める方式よりも正確な体脂肪率を取得することができる。 As described above, it is possible to acquire a body fat percentage that is more accurate than the conventional method of obtaining the body fat percentage from one cross section of the human body.
また、脂肪体積比率を、各断面画像の領域の面積を積算した値に対する各断面画像の領域中の体脂肪の占める面積を積算した値の比率によって求められるものとすれば、より容易に上記体脂肪率を取得することができる。すなわち、各断面画像は所定の厚さ方向の情報をも含むものとして取得することができ、所定厚さの情報を含む断面画像をこの厚さ方向に沿って上記所定厚さ毎に取得すれば、各断面画像の人体部位を示す領域の面積に対し上記所定厚さを乗じて得られた各体積の積算により上記人体部位を示す領域の体積を求めることができる。また、各断面画像の人体部位中の体脂肪を示す領域の面積に対し上記所定厚さを乗じて得られた各体積の積算により上記人体部位中の体脂肪を示す領域の体積を求めることができる。したがって、各断面画像の領域の面積を積算した値に対する各断面画像の領域中の体脂肪の占める面積を積算した値の比率を求めることによって、より容易に上記体脂肪率を取得することができる。 Further, if the fat volume ratio is determined by the ratio of the value obtained by integrating the area occupied by the body fat in the area of each cross-sectional image to the value obtained by integrating the area of the area of each cross-sectional image, the body is more easily obtained. The fat percentage can be obtained. That is, each cross-sectional image can be acquired as including information on a predetermined thickness direction, and if a cross-sectional image including information on a predetermined thickness is acquired for each predetermined thickness along the thickness direction, The volume of the region indicating the human body part can be obtained by integrating each volume obtained by multiplying the area of the region indicating the human body part in each cross-sectional image by the predetermined thickness. Further, the volume of the region showing the body fat in the human body part can be obtained by integrating each volume obtained by multiplying the area of the region showing the body fat in the human body part of each cross-sectional image by the predetermined thickness. it can. Therefore, the body fat percentage can be obtained more easily by determining the ratio of the value obtained by integrating the area occupied by the body fat in each cross-sectional image area to the value obtained by integrating the area of each cross-sectional image area. .
また、上記断面画像に基づいて求める各体積を、各断面画像間の領域の補間によって求めるものとすれば、より確実に上記体脂肪率を取得することができる。 Moreover, if each volume calculated | required based on the said cross-sectional image shall be calculated | required by interpolation of the area | region between each cross-sectional image, the said body fat percentage can be acquired more reliably.
なお、上記断面画像を、Ｘ線ＣＴによる断層撮影で得られたものとすれば、より確実に上記体脂肪率を取得することができる。 In addition, if the cross-sectional image is obtained by tomography by X-ray CT, the body fat percentage can be acquired more reliably.
以下、本発明の実施の形態について、図面を用いて説明する。図１から図５は本発明の体脂肪率取得方法を説明するものである。図１から４は本発明の第１の実施の形態による体脂肪率取得方法に関する図である。図１および図４，図５は本発明の第２の実施の形態による体脂肪率取得方法に関する図である。なお、上記図１は本発明の第１および第２の実施の形態による体脂肪率取得方法を説明するための共通の図である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 5 illustrate the body fat percentage acquisition method of the present invention. 1 to 4 are diagrams relating to a body fat percentage acquisition method according to the first embodiment of the present invention. 1, 4 and 5 are diagrams relating to a body fat percentage acquisition method according to a second embodiment of the present invention. FIG. 1 is a common view for explaining the body fat percentage acquisition method according to the first and second embodiments of the present invention.
上記図１は被検者についての互に異なる断面とそれらの断面画像を示す概念図、図２は被検者の人体部位を示す断面の領域とその中の体脂肪を示す断面の領域とを示す断面図、図３は横軸に体脂肪面積比率の最大値、縦軸に体脂肪率を示す座標上に体脂肪面積比率と体脂肪率の相関関係を示す予め求めておいた曲線から被検者の体脂肪率を取得するためのグラフを示す図である。 FIG. 1 is a conceptual diagram showing different cross-sections and cross-sectional images of the subject, and FIG. 2 is a cross-sectional area showing a human body part of the subject and a cross-sectional area showing body fat therein. FIG. 3 is a cross-sectional view showing the maximum value of the body fat area ratio on the horizontal axis and the curve obtained from the previously obtained curve showing the correlation between the body fat area ratio and the body fat ratio on the coordinates indicating the body fat ratio on the vertical axis. It is a figure which shows the graph for acquiring the body fat rate of an examiner.
本発明の第１の実施の形態による体脂肪率取得方法は、図１に示すように、はじめに、被検者１について、肝臓上部辺縁、横隔膜下部、脊椎の椎間のうちのいずれかを通る断面と腸骨上部、腸骨下部、仙骨下部のうちのいずれかを通る断面との間を通る互に異なる断面Ｄ１〜Ｄ３を示す２種類以上の断面画像である断面画像Ｇ１〜Ｇ３を用意する。ここで、上記断面画像Ｇ１〜Ｇ３は、Ｘ線ＣＴによる断層撮影で得られたものとすることができる。また、肝臓上部辺縁を通る断面、横隔膜下部を通る断面、脊椎の椎間を通る断面、腸骨上部を通る断面、腸骨下部を通る断面、仙骨下部を通る断面は、それぞれ被検者の背骨の伸びる方向に対して垂直な断面である。 As shown in FIG. 1, the body fat percentage acquisition method according to the first embodiment of the present invention firstly selects one of the upper margin of the liver, the lower diaphragm, and the spine intervertebral for the subject 1. Prepare cross-sectional images G1 to G3, which are two or more types of cross-sectional images showing different cross-sections D1 to D3 passing through a cross-section passing through and a cross-section passing through any of the upper iliac, lower iliac and lower sacrum To do. Here, the cross-sectional images G1 to G3 can be obtained by tomography by X-ray CT. In addition, the cross section through the upper margin of the liver, the cross section through the lower diaphragm, the cross section through the vertebrae of the spine, the cross section through the upper iliac, the cross section through the lower iliac, and the cross section through the lower sacrum, It is a cross section perpendicular to the direction in which the spine extends.
上記断面画像は、肝臓上部辺縁を通る断面と腸骨上部を通る断面との間を通る断面を示す画像としたり、肝臓上部辺縁を通る断面と腸骨下部を通る断面との間を通る断面を示す画像としたり、あるいは、横隔膜下部を通る断面と仙骨下部を通る断面との間を通る断面を示す画像等とすることができる。 The cross-sectional image is an image showing a cross section passing between the cross section passing through the upper liver margin and the cross section passing through the upper iliac, or passing between the cross section passing through the upper liver margin and the cross section passing through the lower iliac bone. It can be an image showing a cross section, or an image showing a cross section passing between a cross section passing through the lower diaphragm and a cross section passing through the lower sacrum.
そして、図２に示すように各断面画像Ｇ１〜Ｇ３について、人体部位の断面を示す領域Ｂｓの面積Ｓａ１〜Ｓａ３に対する人体部位の断面内の体脂肪を示す領域Ｆｓの面積Ｓｂ１〜Ｓｂ３それぞれの比率である体脂肪面積比率Ｒｓ１〜Ｒｓ３を得る。つづいて、上記各断面画像Ｇ１〜Ｇ３毎に求めた体脂肪面積比率Ｒｓ１〜Ｒｓ３のうちの最大値Ｒｓｍを求める。 And about each cross-sectional image G1-G3 as shown in FIG. 2, each ratio Sb1-Sb3 area | region Sb1 of the area | region Fs which shows the body fat in the cross section of the human body part with respect to the area Sa1-Sa3 of the area | region Bs which shows the cross section of a human body part The body fat area ratios Rs1 to Rs3 are obtained. Subsequently, a maximum value Rsm is obtained from the body fat area ratios Rs1 to Rs3 obtained for each of the cross-sectional images G1 to G3.
ここで、Ｒｓ１＝Ｓｂ１／Ｓａ１、Ｒｓ２＝Ｓｂ２／Ｓａ２、Ｒｓ３＝Ｓｂ３／Ｓａ３であり、Ｒｓｍ＝Ｒｓ１とする。 Here, Rs1 = Sb1 / Sa1, Rs2 = Sb2 / Sa2, Rs3 = Sb3 / Sa3, and Rsm = Rs1.
さらに、上記体脂肪面積比率の最大値Ｒｓｍを、図３に示すように、複数の互いに異なる人体について予め求めておいた体脂肪面積比率の最大値Ｒｓｍｘと体脂肪率Ｆｒとの相関関係を示す曲線Ｋｓに適用して被検者１の体脂肪率Ｆｒ１を取得する。 Further, as shown in FIG. 3, the maximum value Rsm of the body fat area ratio indicates the correlation between the maximum value Rsmx of the body fat area ratio and the body fat percentage Fr obtained in advance for a plurality of different human bodies. The body fat percentage Fr1 of the subject 1 is acquired by applying to the curve Ks.
上記曲線Ｋｓを取得するにあたり、各人体の体脂肪面積比率およびその最大値は、上記と同様の手法によって求めることができる。また、各人体の体脂肪率については、水中体重法により得られた人体の体密度から体脂肪率を推定する方式等を採用することができる。 In obtaining the curve Ks, the body fat area ratio and the maximum value of each human body can be obtained by the same method as described above. Moreover, about the body fat rate of each human body, the system etc. which estimate a body fat rate from the body density of the human body obtained by the underwater body weight method can be employ | adopted.
上記体脂肪面積比率の最大値は、人体の１断面のみを用いた方式に比して個人差のより少ない値であり、体脂肪面積比率の最大値と体脂肪率との相関関係も従来に比して高い相関を示すものとすることができるので、上記被検者の体脂肪率をより正確に推定することができる。 The maximum value of the body fat area ratio is a value with less individual differences compared to the method using only one cross section of the human body, and the correlation between the maximum value of the body fat area ratio and the body fat percentage has also been conventional. Since the correlation can be higher than that of the subject, the body fat percentage of the subject can be estimated more accurately.
本発明の第２の実施の形態による体脂肪率取得方法は、上記のように断面画像から人体部位を示す領域の面積を求めて体脂肪率を取得する代わりに、上記断面画像から人体部位を示す領域の体積を求めて体脂肪率を取得するものである。 The body fat percentage acquisition method according to the second embodiment of the present invention obtains the human body part from the cross-sectional image instead of obtaining the body fat percentage by obtaining the area of the region indicating the human body part from the cross-sectional image as described above. The body fat percentage is obtained by obtaining the volume of the region shown.
図４は被検者の人体部位を示す領域の体積とその中の体脂肪を示す領域の体積とを示す概念図、図５は横軸に脂肪体積比率、縦軸に体脂肪率を示す座標上に示した脂肪体積比率と体脂肪率の相関関係を示す予め求めておいた曲線を利用して被検者の体脂肪率を取得するためのグラフを示す図である。 FIG. 4 is a conceptual diagram showing the volume of the region showing the human body part of the subject and the volume of the region showing the body fat therein, and FIG. 5 is a coordinate showing the fat volume ratio on the horizontal axis and the body fat percentage on the vertical axis. It is a figure which shows the graph for acquiring the body fat rate of a subject using the curve previously calculated | required which shows the correlation of the fat volume ratio shown above and a body fat rate.
はじめに、上記第１の実施の形態と同様に、上記図１に示すように、被検者１について、胸骨の下端を通る断面と恥骨の上端を通る断面との間を通る互に異なる断面Ｄ１〜Ｄ３を示す２種類以上の断面画像である断面画像Ｇ１〜Ｇ３を用意する。すなわち、上記断面画像Ｇ１〜Ｇ３は、Ｘ線ＣＴによる断層撮影で得られたものとすることができ、また、上記胸骨の下端を通る断面、および恥骨の上端を通る断面は、それぞれ被検者１の背骨の伸びる方向に対して垂直な断面である。 First, as in the first embodiment, as shown in FIG. 1, different cross-sections D <b> 1 passing between a cross-section passing through the lower end of the sternum and a cross-section passing through the upper end of the pubic bone for the subject 1. Prepare cross-sectional images G1 to G3, which are two or more types of cross-sectional images showing D3. That is, the cross-sectional images G1 to G3 can be obtained by tomography by X-ray CT, and the cross-section passing through the lower end of the sternum and the cross-section passing through the upper end of the pubic bone are the subject. It is a cross section perpendicular | vertical with respect to the direction where 1 spine extends.
そして、図４（ａ）、（ｂ）に示すように、断面画像Ｇ１〜Ｇ２、および断面画像Ｇ２〜Ｇ３の間を補間して、断面画像Ｇ１と断面画像Ｇ３との間の人体部位を示す領域Ｂｖの体積と上記断面画像Ｇ１、Ｇ３間のこの人体部位中の体脂肪を示す領域Ｆｖの体積とを求め、人体部位を示す領域Ｂｖの体積に対する体脂肪を示す領域Ｆｖの体積の比率を表す脂肪体積比率Ｒｖ（Ｒｖ＝領域Ｆｖの体積／領域Ｂｖの体積）を得る。 Then, as shown in FIGS. 4A and 4B, the human body part between the cross-sectional image G1 and the cross-sectional image G3 is shown by interpolating between the cross-sectional images G1-G2 and the cross-sectional images G2-G3. The volume of the region Bv and the volume of the region Fv indicating the body fat in the human body part between the cross-sectional images G1 and G3 are obtained, and the ratio of the volume of the region Fv indicating the body fat to the volume of the region Bv indicating the human body part is determined. The represented fat volume ratio Rv (Rv = volume of region Fv / volume of region Bv) is obtained.
ここで、断面画像Ｇ１〜Ｇ２間を補間して得られた人体部位を示す領域Ｂｖ１の体積と断面画像Ｇ２〜Ｇ３間を補間して得られた人体部位を示す領域Ｂｖ２の体積との和が上記領域Ｂｖの体積となる。また、断面画像Ｇ１〜Ｇ２間を補間して得られた人体部位中の体脂肪を示す領域Ｆｖ１の体積と断面画像Ｇ２〜Ｇ３間を補間して得られた人体部位中の体脂肪を示す領域Ｆｖ２の体積との和が上記領域Ｆｖの体積となる。 Here, the sum of the volume of the region Bv1 indicating the human body part obtained by interpolating between the cross-sectional images G1 and G2 and the volume of the region Bv2 indicating the human body part obtained by interpolating between the cross-sectional images G2 and G3 is obtained. This is the volume of the region Bv. Moreover, the area | region which shows the body fat in the human body part obtained by interpolating between the volume of the area | region Fv1 which shows the body fat in the human body part obtained by interpolating between the cross-sectional images G1-G2, and the cross-sectional images G2-G3 The sum of the volume of Fv2 is the volume of the region Fv.
さらに、図５に示すように、上記脂肪体積比率Ｒｖを、複数の互いに異なる人体について予め求めておいた脂肪体積比率Ｒｖｘと体脂肪率Ｆｒとの相関関係Ｋｖに適用して上記被検者１の体脂肪率Ｆｒ２を取得する。 Further, as shown in FIG. 5, the fat volume ratio Rv is applied to the correlation Kv between the fat volume ratio Rvx and the body fat ratio Fr obtained in advance for a plurality of different human bodies, and the subject 1 To obtain the body fat percentage Fr2.
上記曲線Ｋｖを取得するにあたり、各人体の脂肪体積比率は上記と同様の手法によって求めることができる。また、各人体の体脂肪率は、水中体重法により得られた人体の体密度から体脂肪率を推定する方式等を採用することができる。 In obtaining the curve Kv, the fat volume ratio of each human body can be obtained by the same method as described above. For the body fat percentage of each human body, a method of estimating the body fat percentage from the body density of the human body obtained by the underwater weight method can be employed.
上記脂肪体積比率は、人体の１断面を用いる従来の方式に比して個人差のより少ない値であり、脂肪体積比率と体脂肪率との相関関係も従来に比して高い相関を示すものとすることができるので、上記被検者の体脂肪率をより正確に推定することができる。 The above fat volume ratio is a value with less individual difference compared to the conventional method using one cross section of the human body, and the correlation between the fat volume ratio and the body fat percentage is also higher than the conventional one. Therefore, the body fat percentage of the subject can be estimated more accurately.
上記補間は、１次間数による補間としてもよい。また、上記補間は、２関数による補間や３次以上の高次関数による補間とすることもできる。さらに、上記とは異なる他の関数を用いた補間としてもよい。なお、上記補間に用いられる関数は、被検者の背骨の伸びる方向に対して平行な平面座標上において規定される関数である。 The interpolation may be interpolation based on the number of first order. In addition, the interpolation can be interpolation by a two function or interpolation by a higher order function of a third order or higher. Furthermore, interpolation using another function different from the above may be used. In addition, the function used for the said interpolation is a function prescribed | regulated on the plane coordinate parallel to the extension direction of a subject's spine.
なお、上記のように、例えば、断面画像Ｇ１〜Ｇ２間、断面画像Ｇ２〜Ｇ３間を補間して領域Ｂｖ１、領域Ｂｖ２の体積を取得し、両者の加算により、断面画像Ｇ１〜Ｇ３間の領域Ｂｖの体積を求める場合に限らない。 Note that, as described above, for example, the volume of the regions Bv1 and Bv2 is acquired by interpolating between the cross-sectional images G1 and G2 and between the cross-sectional images G2 and G3, and by adding them, the region between the cross-sectional images G1 and G3 is obtained. The present invention is not limited to obtaining the volume of Bv.
図６は、脂肪体積比率を、各断面画像の領域の面積を積算した値に対する各断面画像の領域中の体脂肪の占める面積を積算した値の比率によって求める場合について説明した概念図である。 FIG. 6 is a conceptual diagram illustrating the case where the fat volume ratio is obtained by the ratio of the value obtained by integrating the area occupied by the body fat in each cross-sectional image region to the value obtained by integrating the area of each cross-sectional image region.
Ｘ線ＣＴによる断層撮影で断面画像を取得する場合には、上記断面画像はその断面と直交する厚さ方向の情報をも含んでいる。したがって、上記断層撮影で得られた断面画像は所定の厚さｔｖ間の情報が平均化されたものと考えられる。 When a cross-sectional image is acquired by tomography using X-ray CT, the cross-sectional image also includes information on a thickness direction orthogonal to the cross-section. Accordingly, it is considered that the cross-sectional image obtained by the tomography is obtained by averaging information between the predetermined thicknesses tv.
したがって、上記所定の厚さｔｖ毎に断層撮影して上記領域Ｂｖの範囲について連続する断面画像Ｂｖ０１〜Ｂｖ０６を取得することにより、人体断面を示す領域Ｂｖの体積を（Ｂｖ０１の面積×ｔｖ）+（Ｂｖ０２の面積×ｔｖ）+・・・+（Ｂｖ０６の面積×ｔｖ）の演算によって求めることができる。 Therefore, by obtaining tomographic images for each predetermined thickness tv and obtaining cross-sectional images Bv01 to Bv06 that are continuous over the range of the region Bv, the volume of the region Bv indicating the human body cross-section is calculated as (Bv01 area × tv) + (Bv02 area × tv) +... + (Bv06 area × tv).
また、体脂肪を示す領域Ｆｖの体積を、（Ｆｖ０１の面積×ｔｖ）+（Ｆｖ０２の面積×ｔｖ）+・・・+（Ｆｖ０６の面積×ｔｖ）の演算によって求めることができる。 Further, the volume of the region Fv indicating body fat can be obtained by the calculation of (Fv01 area × tv) + (Fv02 area × tv) +... + (Fv06 area × tv).
したがって、脂肪体積比率を、（Ｆｖ０１の面積+Ｆｖ０２の面積+・・・+Ｆｖ０６の面積）／（Ｂｖ０１の面積+Ｂｖ０２の面積+・・・+Ｂｖ０６の面積）の演算によって求めることができる。 Therefore, the fat volume ratio can be obtained by the calculation of (area of Fv01 + area of Fv02 +... Area of Fv06) / (area of Bv01 + area of Bv02 +... + Bv06 area).
上記のことにより、脂肪体積比率を、各断面画像の領域の面積を積算した値に対する各断面画像の領域中の体脂肪の占める面積を積算した値の比率によって求めることができる。 上記第１および第２の実施の形態において、上記体脂肪は、内臓脂肪と皮下脂肪とを合わせたものである。また、上記断面画像Ｇ１〜Ｇ３は、被検者１の背骨の伸びる方向に対して垂直な断面とすることが望ましいが、必ずしもそのような場合に限らず、上記肝臓上部辺縁、横隔膜下部、脊椎の椎間のうちのいずれかを通る断面と腸骨上部、腸骨下部、仙骨下部のうちのいずれかを通る断面との間を通る互に異なる断面であれば、被検者１の背骨の伸びる方向に対して傾斜した断面を示す画像であってもよい。 By the above, the fat volume ratio can be obtained by the ratio of the value obtained by integrating the area occupied by the body fat in the area of each cross-sectional image to the value obtained by integrating the areas of the areas of the cross-sectional images. In the first and second embodiments, the body fat is a combination of visceral fat and subcutaneous fat. The cross-sectional images G1 to G3 are preferably cross-sections perpendicular to the direction in which the spine of the subject 1 extends, but this is not necessarily the case, and the upper liver margin, the lower diaphragm, If the cross-section passing through any one of the vertebrae of the spine and the cross-section passing through any of the upper iliac, lower iliac, and lower sacrum are mutually different, the spine of the subject 1 It may be an image showing a cross section inclined with respect to the extending direction.
１ 被検者
Ｄ１〜Ｄ３ 断面
Ｇ１、Ｇ２、Ｇ３ 断面画像
Ｂｓ 被験者の断面を示す領域
Ｆｓ 体脂肪を示す領域
Ｒｓ１〜Ｒｓ３ 体脂肪面積比率
DESCRIPTION OF SYMBOLS 1 Subject D1-D3 cross section G1, G2, G3 cross section image Bs Area | region which shows the test subject's cross section Fs Area | region which shows body fat Rs1-Rs3 Body fat area ratio
Claims (2)
被検者について、肝臓上部辺縁、横隔膜下部、脊椎の椎間のうちのいずれかを通る断面と腸骨上部、腸骨下部、仙骨下部のうちのいずれかを通る断面との間を通る互に異なる断面を示す２種類以上の断面画像を用意し、
各断面画像について、断面を示す領域の面積に対するこの断面内の皮下脂肪と内臓脂肪とを合わせた体脂肪を示す領域の面積の比率である体脂肪面積比率を得、
各断面画像毎に求めた前記体脂肪面積比率のうちの最大値を求め、
該最大値を、複数の互いに異なる人体について予め求めておいた体脂肪面積比率の最大値と体脂肪率との相関関係に適用して前記被検者の体脂肪率を取得することを特徴とする体脂肪率取得方法。 A body fat percentage acquisition method for obtaining a body fat percentage of a human body,
The subject passes between the cross section that passes through the upper margin of the liver, the lower diaphragm, and the vertebrae of the spine and the cross section that passes through the upper iliac, lower iliac, and lower sacrum. Prepare two or more types of cross-sectional images showing different cross-sections,
For each cross-sectional image, obtain a body fat area ratio , which is the ratio of the area of the area showing the body fat that combines the subcutaneous fat and the visceral fat in the cross section to the area of the area showing the cross section,
Find the maximum value of the body fat area ratio obtained for each cross-sectional image,
Applying the maximum value to the correlation between the maximum body fat area ratio previously determined for a plurality of different human bodies and the body fat percentage, and obtaining the body fat percentage of the subject, To obtain body fat percentage.
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