Near-infrared window in biological tissue
http://dbpedia.org/resource/Near-infrared_window_in_biological_tissue
生物组织光学窗口（或近紅外窗口、治療窗口）指的是光在生物组织内穿透深度达到最大值的波长区间，一般处于近红外波长范围内。在，散射是光与组织间最主要的作用形式，导致光在传播过程中迅速弥散。由于散射增大了光子在组织内的传播距离，因而光子为组织所吸收的概率也随之增大。实际上，散射效应随波长变化很小，因此，生物组织光学窗口的范围主要受限于组织的吸收，其下限（短波长一端）由血液吸收所决定，上限（长波长一端）则由水的吸收所决定。对于和光热等应用而言，选择位于光学窗口波长范围内的合适光源，对于提高成像（治疗）效率、提高穿透深度、降低光致组织损伤，有着十分重要的意义。
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The near-infrared (NIR) window (also known as optical window or therapeutic window) defines the range of wavelengths from 650 to 1350 nanometre (nm) where light has its maximum depth of penetration in tissue. Within the NIR window, scattering is the most dominant light-tissue interaction, and therefore the propagating light becomes diffused rapidly. Since scattering increases the distance travelled by photons within tissue, the probability of photon absorption also increases. Because scattering has weak dependence on wavelength, the NIR window is primarily limited by the light absorption of blood at short wavelengths and water at long wavelengths. The technique using this window is called NIRS. Medical imaging techniques such as fluorescence image-guided surgery often make use of the NIR w
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Near-infrared window in biological tissue
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生物组织光学窗口
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1116901737
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Figure_3_The_absorption_spectrum_for_arteries
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Figure_4_The_absorption_spectrum_for_veins
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Figure_5_The_absorption_spectrum_for_breast_tissue
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Figure 6 : Spectra for veins .
Absorption coefficient: λmin = 730 nm; NIR window = nm.
Effective attenuation coefficient: λmin = 730 nm; NIR window = nm.
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Figure 6 : Spectra for breast tissue .
Absorption coefficient: λmin = 730 nm; NIR window = nm.
Effective attenuation coefficient: λmin = 730 nm; NIR window = nm.
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Figure 6 : Spectra for arteries .
Absorption coefficient: λmin = 686 nm; NIR window = nm.
Effective attenuation coefficient: λmin = 690 nm; NIR window = nm.
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Arteries absorption.png
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Breast absorption.png
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Veins absorption.png
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200
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The near-infrared (NIR) window (also known as optical window or therapeutic window) defines the range of wavelengths from 650 to 1350 nanometre (nm) where light has its maximum depth of penetration in tissue. Within the NIR window, scattering is the most dominant light-tissue interaction, and therefore the propagating light becomes diffused rapidly. Since scattering increases the distance travelled by photons within tissue, the probability of photon absorption also increases. Because scattering has weak dependence on wavelength, the NIR window is primarily limited by the light absorption of blood at short wavelengths and water at long wavelengths. The technique using this window is called NIRS. Medical imaging techniques such as fluorescence image-guided surgery often make use of the NIR window to detect deep structures.
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生物组织光学窗口（或近紅外窗口、治療窗口）指的是光在生物组织内穿透深度达到最大值的波长区间，一般处于近红外波长范围内。在，散射是光与组织间最主要的作用形式，导致光在传播过程中迅速弥散。由于散射增大了光子在组织内的传播距离，因而光子为组织所吸收的概率也随之增大。实际上，散射效应随波长变化很小，因此，生物组织光学窗口的范围主要受限于组织的吸收，其下限（短波长一端）由血液吸收所决定，上限（长波长一端）则由水的吸收所决定。对于和光热等应用而言，选择位于光学窗口波长范围内的合适光源，对于提高成像（治疗）效率、提高穿透深度、降低光致组织损伤，有着十分重要的意义。
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13418
