Phantom
AssigneeCanon Kabushiki Kaisha
InventorsTakahiro Suita, Ryo Ogawa
Life of this patent
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Abstract
This invention provides a phantom whose light propagation characteristics and acoustic propagation characteristics are similar to those of human tissues and which allows detection of an absorber also with an ultrasonic wave diagnostic apparatus and allows adjustment of the oxygen saturation. A phantom has light absorbers 12a to 12d in a phantom base material 11, in which the light absorbers 12a to 12d approximate the light absorption coefficient ratio at two or more wavelengths to that of biological tissues, and the acoustic propagation characteristics of the phantom base material 11 and the light absorbers 12a to 12d are different from each other.
Claims20
A phantom, comprising:
- a light absorber in a phantom base material, wherein
- the light absorber approximates a light absorption coefficient ratio at two or more wavelengths to that of biological materials, and
- acoustic propagation characteristics of the phantom base material and the light absorber are different from each other,
- wherein the light absorber contains two or more kinds of light absorbing compounds in a light absorber base material, absorption coefficient ratios μ[λ2]/μ[λ1] of the light absorbing compounds at arbitrary two wavelengths λ1 and λ2 (λ1<λ2) of 600 nm or more and 1100 nm or less are different from each other, and a parameter S calculated from the following equation (1) is 0 or more and 100 or less, and
- wherein a coefficient of linear expansion of the light absorber base material is 100 ppm/K or more and 1000 ppm/K or less,
- S
- =
- P
- ′
- ·
- Hb
-
- [
- λ
- 1
- ]
- -
- Hb
-
- [
- λ
- 2
- ]
- (
- HbO
- 2
-
- [
- λ
- 2
- ]
- -
- Hb
-
- [
- λ
- 2
- ]
- )
- -
- P
- ′
- ·
- (
- HbO
- 2
-
- [
- λ
- 1
- ]
- -
- Hb
-
- [
- λ
- 1
- ]
- )
- ·
- 100
- equation
-
-
- (
- 1
- )
- wherein HbO2[λ1] indicates an absorption coefficient of oxyhemoglobin at the wavelength λ1, HbO2[λ2] indicates an absorption coefficient of oxyhemoglobin at the wavelength λ2, Hb[λ1] indicates an absorption coefficient of deoxyhemoglobin at the wavelength λ1, Hb[λ2] indicates an absorption coefficient of deoxyhemoglobin at the wavelength λ2, and P′ indicates a ratio (Pλ2/Pλ1) of a photoacoustic signal intensity Pλ2 obtained by irradiation with light of the wavelength λ2 to a photoacoustic signal intensity Pλ1 obtained by irradiation with light of the wavelength λ1.
A phantom, comprising:
- a light absorber in a phantom base material, wherein
- the light absorber approximates a light absorption coefficient ratio at two or more wavelengths to that of biological materials, and
- acoustic propagation characteristics of the phantom base material and the light absorber are different from each other,
- wherein the light absorber contains two or more kinds of light absorbing compounds in a light absorber base material, absorption coefficient ratios μ[λ2]/μ[λ1] of the light absorbing compounds at arbitrary two wavelengths λ1 and λ2 (λ1<λ2) of 600 nm or more and 1100 nm or less are different from each other.
Dependencies are inferred from the claim text.