TWI729813B - Blood vessel image forming system - Google Patents

Blood vessel image forming system Download PDF

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TWI729813B
TWI729813B TW109116350A TW109116350A TWI729813B TW I729813 B TWI729813 B TW I729813B TW 109116350 A TW109116350 A TW 109116350A TW 109116350 A TW109116350 A TW 109116350A TW I729813 B TWI729813 B TW I729813B
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Taiwan
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infrared light
viewing angle
imaging system
limiting sheet
angle limiting
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TW109116350A
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Chinese (zh)
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TW202145067A (en
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廖一寰
章鈞
潘品君
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友達光電股份有限公司
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Priority to CN202011242824.1A priority patent/CN112493990B/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
    • A61B5/0082—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/48—Other medical applications
    • A61B5/4887—Locating particular structures in or on the body
    • A61B5/489—Blood vessels

Abstract

A blood vessel image forming system including a flat light source, a viewing angle limiting sheet and a near-infrared photo sensor is provided. The flat light source provides light with a divergence angle of 120 degrees or less. The viewable angle of the viewing angle limiting sheet is 60 degrees or less. The viewing angle limiting sheet is stacked between the flat light source and the near-infrared photo sensor. Alternatively, the near-infrared photo sensor is stacked between the flat light source and the viewing angle limiting sheet.

Description

血管成像系統Vascular imaging system

本發明是有關於一種成像系統，且特別是有關於一種血管成像系統。The present invention relates to an imaging system, and particularly relates to a blood vessel imaging system.

就現有技術而言，市面上的血管成像系統是使用紅外光光源和照相機拍攝人體組織。因為血管內的血紅素會吸收紅外光，故會得到深色的血管輪廓影像。為了維持靜脈辨識的精準度，拍攝面積不能過小，但傳統血管成像系統使用了透鏡來聚光，造成拍攝時的視角有限，若要大面積拍攝則需要較長的拍攝距離，或是分區進行多次的拍攝。As far as the prior art is concerned, vascular imaging systems on the market use infrared light sources and cameras to photograph human tissues. Because the hemoglobin in the blood vessels absorbs infrared light, dark blood vessel contour images can be obtained. In order to maintain the accuracy of vein recognition, the shooting area cannot be too small. However, the traditional vascular imaging system uses a lens to condense the light, which results in a limited angle of view during shooting. If a large area is to be shot, a longer shooting distance is required, or multiple divisions are required. Times of shooting.

本發明提供一種血管成像系統，可解決大面積拍攝時遇到的問題。The invention provides a blood vessel imaging system, which can solve the problems encountered in large-area shooting.

本發明的血管成像系統包括一面光源、一視角限制片以及一近紅外光感測器。面光源提供發散角小於等於120度的光線。視角限制片的可視角小於等於60度。視角限制片疊置於面光源與近紅外光感測器之間。或者，近紅外光感測器疊置於面光源與視角限制片之間。The blood vessel imaging system of the present invention includes a surface light source, a viewing angle limiting sheet and a near-infrared light sensor. The surface light source provides light whose divergence angle is less than or equal to 120 degrees. The viewing angle of the viewing angle limiting sheet is less than or equal to 60 degrees. The viewing angle limiting sheet is stacked between the surface light source and the near-infrared light sensor. Alternatively, the near-infrared light sensor is stacked between the surface light source and the viewing angle limiting sheet.

在本發明的一實施例中，血管成像系統更包括一近紅外光濾光片，其中近紅外光感測器疊置於面光源與近紅外光濾光片之間，且近紅外光濾光片疊置於近紅外光感測器與視角限制片之間。In an embodiment of the present invention, the blood vessel imaging system further includes a near-infrared light filter, wherein the near-infrared light sensor is stacked between the surface light source and the near-infrared light filter, and the near-infrared light filter is The sheet stack is placed between the near-infrared light sensor and the viewing angle limiting sheet.

在本發明的一實施例中，血管成像系統更包括一近紅外光濾光片，其中近紅外光感測器疊置於面光源與近紅外光濾光片之間，且視角限制片疊置於近紅外光感測器與近紅外光濾光片之間。In an embodiment of the present invention, the blood vessel imaging system further includes a near-infrared light filter, wherein the near-infrared light sensor is stacked between the surface light source and the near-infrared light filter, and the viewing angle limiting sheet is stacked Between the near-infrared light sensor and the near-infrared light filter.

在本發明的一實施例中，近紅外光感測器的感測面朝向視角限制片。In an embodiment of the present invention, the sensing surface of the near-infrared light sensor faces the viewing angle limiting sheet.

在本發明的一實施例中，近紅外光感測器的感測區呈矩形，且其任一邊長大於等於9公分。In an embodiment of the present invention, the sensing area of the near-infrared light sensor is rectangular, and any side length thereof is greater than or equal to 9 cm.

在本發明的一實施例中，視角限制片疊置於面光源與近紅外光感測器之間，面光源與近紅外光感測器之間的距離介於3公分至6公分。In an embodiment of the present invention, the viewing angle limiting sheet is stacked between the surface light source and the near-infrared light sensor, and the distance between the surface light source and the near-infrared light sensor is between 3 cm and 6 cm.

在本發明的一實施例中，面光源的發光面完全覆蓋近紅外光感測器的感測區。In an embodiment of the present invention, the light-emitting surface of the surface light source completely covers the sensing area of the near-infrared light sensor.

在本發明的一實施例中，面光源發光時，在距離面光源6公分處的光強度大於等於1 mW/cm 2。 In an embodiment of the present invention, when the surface light source emits light, the light intensity at a distance of 6 cm from the surface light source is greater than or equal to 1 mW/cm 2 .

在本發明的一實施例中，視角限制片由多根導光柱陣列排列而成。In an embodiment of the present invention, the viewing angle limiting sheet is formed by arraying a plurality of light guide rods.

在本發明的一實施例中，視角限制片內具有平行且等距排列的多個遮光牆。In an embodiment of the present invention, the viewing angle limiting sheet has a plurality of light-shielding walls arranged in parallel and equidistantly.

在本發明的一實施例中，視角限制片直接接觸近紅外光感測器。In an embodiment of the present invention, the viewing angle limiting sheet directly contacts the near-infrared light sensor.

在本發明的一實施例中，視角限制片完全覆蓋近紅外光感測器的感測區。In an embodiment of the present invention, the viewing angle limiting sheet completely covers the sensing area of the near-infrared light sensor.

在本發明的一實施例中，視角限制片的正向光穿透率大於50%。In an embodiment of the present invention, the forward light transmittance of the viewing angle limiting sheet is greater than 50%.

基於上述，在本發明的血管成像系統中，因為面光源的發散角與視角限制片的可視角的配合，無須加大近紅外光感測器與被攝物的距離就可完成大面積的拍攝。Based on the above, in the blood vessel imaging system of the present invention, because the divergence angle of the surface light source is matched with the viewing angle of the viewing angle limiting sheet, large-area shooting can be completed without increasing the distance between the near-infrared light sensor and the object. .

圖1是依照本發明的一實施例的血管成像系統的使用狀態示意圖。本實施例的血管成像系統100包括一面光源110、一視角限制片120以及一近紅外光感測器130。面光源110提供發散角A12小於等於120度的光線。視角限制片120的可視角A14小於等於60度。視角限制片120疊置於面光源110與近紅外光感測器130之間。Fig. 1 is a schematic diagram of a use state of a vascular imaging system according to an embodiment of the present invention. The blood vessel imaging system 100 of this embodiment includes a surface light source 110, a viewing angle limiting sheet 120, and a near-infrared light sensor 130. The surface light source 110 provides light whose divergence angle A12 is less than or equal to 120 degrees. The viewing angle A14 of the viewing angle limiting sheet 120 is less than or equal to 60 degrees. The viewing angle limiting sheet 120 is stacked between the surface light source 110 and the near-infrared light sensor 130.

面光源110提供發散角A12小於等於120度的光線的意思是，從面光源110上的任一發光點離開的光線與面光源110的法線方向的夾角都會小於等於60度，故總發散角為120度。視角限制片120的可視角A14小於等於60度的意思是，從視角限制片120遠離面光源110的表面上的任一點離開的光線與視角限制片120的法線方向的夾角都會小於等於30度，也就相當於可入射光的行進方向的最大夾角為60度。The surface light source 110 provides light with a divergence angle A12 less than or equal to 120 degrees. This means that the angle between the light leaving any light-emitting point on the surface light source 110 and the normal direction of the surface light source 110 will be less than or equal to 60 degrees, so the total divergence angle It is 120 degrees. The viewing angle A14 of the viewing angle limiting sheet 120 is less than or equal to 60 degrees, which means that the angle between the light leaving any point on the surface of the viewing angle limiting sheet 120 away from the surface light source 110 and the normal direction of the viewing angle limiting sheet 120 will be less than or equal to 30 degrees. , Which is equivalent to the maximum angle of the direction of travel of the incident light is 60 degrees.

在本實施例的血管成像系統100中，因為採用了面光源110且限制了發散角A12小於等於120度，再搭配可視角A14小於等於60度的視角限制片120，所以可避免搭載了血管的影像的光線過於發散，進而得到清晰的血管影像。此外，在本實施例的血管成像系統100中，只要是系統有覆蓋的範圍，都可以得到清晰的血管影像，因此很容易達成大面積拍攝的目的。如此一來，不需要拉大拍攝距離而導致系統的整體體積過大，也無須分區進行多次拍攝。In the blood vessel imaging system 100 of this embodiment, because the surface light source 110 is used and the divergence angle A12 is restricted to be less than or equal to 120 degrees, and the viewing angle limiting sheet 120 with the viewing angle A14 being less than or equal to 60 degrees is used, it is possible to avoid the installation of blood vessels. The light of the image is too divergent, and a clear blood vessel image is obtained. In addition, in the blood vessel imaging system 100 of this embodiment, as long as the system has a coverage area, a clear blood vessel image can be obtained, so it is easy to achieve the purpose of shooting a large area. In this way, there is no need to extend the shooting distance and cause the overall volume of the system to be too large, and there is no need to partition for multiple shooting.

在本實施例中，近紅外光感測器130的感測區132呈矩形，且其任一邊長大於等於9公分。這個尺寸的感測區132足以一次覆蓋大部分人的食指、中指、無名指與小指的第二和第三指節的總和區域，因此可一次取得所需的血管影像。舉例來說，這邊所指的血管影像是指靜脈影像，但本發明不侷限於此。In this embodiment, the sensing area 132 of the near-infrared light sensor 130 is rectangular, and any side length thereof is greater than or equal to 9 cm. The sensing area 132 of this size is sufficient to cover the total area of the second and third knuckles of the index finger, middle finger, ring finger and little finger of most people at one time, so that the desired blood vessel image can be obtained at one time. For example, the blood vessel image referred to here refers to the vein image, but the present invention is not limited to this.

本實施例的視角限制片120疊置於面光源110與近紅外光感測器130之間。換言之，面光源110、視角限制片120以及近紅外光感測器130都是呈片狀，並且層層相疊。面光源110與近紅外光感測器130之間的距離例如介於3公分至6公分。在此距離內，既可容納大部分人的手，也可確保光源的強度足夠，並控制整個系統的厚度在適當的範圍內。The viewing angle limiting sheet 120 of this embodiment is stacked between the surface light source 110 and the near-infrared light sensor 130. In other words, the surface light source 110, the viewing angle limiting sheet 120, and the near-infrared light sensor 130 are all in a sheet shape, and are layered on top of each other. The distance between the surface light source 110 and the near-infrared light sensor 130 is, for example, 3 cm to 6 cm. Within this distance, it can not only accommodate most people's hands, but also ensure that the intensity of the light source is sufficient, and control the thickness of the entire system within an appropriate range.

本實施例的面光源110的發光面112完全覆蓋近紅外光感測器130的感測區132，以提供均勻的光線而到較佳的成像品質。此外，本實施例的面光源110發光時，在距離面光源110有6公分遠處的光強度例如大於等於1 mW/cm 2，以確保有足夠亮度可取得較佳的成像品質。 The light-emitting surface 112 of the surface light source 110 of this embodiment completely covers the sensing area 132 of the near-infrared light sensor 130 to provide uniform light and achieve better imaging quality. In addition, when the surface light source 110 of this embodiment emits light, the light intensity at a distance of 6 cm away from the surface light source 110 is, for example, greater than or equal to 1 mW/cm 2 to ensure sufficient brightness for better imaging quality.

本實施例的視角限制片120例如是直接接觸近紅外光感測器130，以確保入射近紅外光感測器130的光線的入射角受到控制。此外，本實施例的視角限制片120例如完全覆蓋近紅外光感測器130的感測區132，以進一步確保入射近紅外光感測器130的光線的入射角受到控制。再者，本實施例的視角限制片120的正向光穿透率例如大於50%，以確保有足夠亮度可取得較佳的成像品質。在這邊所說的大於50%的光穿透率是指，能夠入射並離開視角限制片120的光線中，有50%的光強度可以被保留。The viewing angle limiting sheet 120 of this embodiment, for example, directly contacts the near-infrared light sensor 130 to ensure that the incident angle of the light incident on the near-infrared light sensor 130 is controlled. In addition, the viewing angle limiting sheet 120 of this embodiment, for example, completely covers the sensing area 132 of the near-infrared light sensor 130 to further ensure that the incident angle of the light incident on the near-infrared light sensor 130 is controlled. Furthermore, the forward light transmittance of the viewing angle limiting sheet 120 of this embodiment is, for example, greater than 50%, so as to ensure sufficient brightness to achieve better imaging quality. The light transmittance greater than 50% mentioned here means that 50% of the light intensity of the light that can enter and leave the viewing angle limiting sheet 120 can be retained.

圖2是圖1的血管成像系統的視角限制片的局部示意圖。請參照圖2，本實施例的視角限制片120由多根導光柱122陣列排列而成。藉此設計，入射任一導光柱122的光線將無法入射其他導光柱122。並且，適當設計導光柱122的入光面積、出光面積與柱體高度，就可以滿足可視角A14小於等於60度的要求。Fig. 2 is a partial schematic diagram of a viewing angle limiting sheet of the vascular imaging system of Fig. 1. Please refer to FIG. 2, the viewing angle limiting sheet 120 of this embodiment is formed by arraying a plurality of light guide rods 122 in an array. With this design, the light incident on any light guide rod 122 will not be able to enter other light guide rods 122. In addition, appropriately designing the light incident area, the light exit area, and the height of the light guide column 122 can satisfy the requirement that the viewing angle A14 is less than or equal to 60 degrees.

圖3是依照本發明的另一實施例的血管成像系統的視角限制片的局部示意圖。本實施例的血管成像系統與圖1的實施例相似，僅視角限制片不同，故省略其餘元件的說明。請參照圖3，在本實施例中，視角限制片230內具有平行且等距排列的多個遮光牆232。因為光線無法通過遮光牆232，所以只要適當設計遮光牆232之間的間距以及遮光牆232的高度，就可以滿足可視角A14小於等於60度的要求。Fig. 3 is a partial schematic diagram of a viewing angle limiting sheet of a vascular imaging system according to another embodiment of the present invention. The blood vessel imaging system of this embodiment is similar to the embodiment of FIG. 1 except that the viewing angle limiting sheet is different, so the description of the remaining components is omitted. Please refer to FIG. 3, in this embodiment, the viewing angle limiting sheet 230 has a plurality of light-shielding walls 232 arranged in parallel and equidistantly. Because light cannot pass through the light-shielding wall 232, as long as the distance between the light-shielding walls 232 and the height of the light-shielding wall 232 are appropriately designed, the requirement that the viewing angle A14 is less than or equal to 60 degrees can be satisfied.

圖4是依照本發明的再一實施例的血管成像系統的使用狀態示意圖。請參照圖4，本實施例的血管成像系統200與圖1的實施例相似，在此僅說明兩者的差異處，其餘相似處在此不再贅述。在本實施例中，近紅外光感測器130疊置於面光源110與視角限制片120之間。面光源110發出的光線會穿過近紅外光感測器130與視角限制片120，並且在受到被攝物（例如使用者的手指）反射後再次通過視角限制片120，然後入射近紅外光感測器130而產生被攝物的影像。Fig. 4 is a schematic diagram of a use state of a vascular imaging system according to still another embodiment of the present invention. Please refer to FIG. 4, the blood vessel imaging system 200 of this embodiment is similar to the embodiment of FIG. 1, and only the differences between the two are described here, and the rest of the similarities will not be repeated here. In this embodiment, the near-infrared light sensor 130 is stacked between the surface light source 110 and the viewing angle limiting sheet 120. The light emitted by the surface light source 110 passes through the near-infrared light sensor 130 and the viewing angle limiting sheet 120, and after being reflected by the subject (such as the user's finger), passes through the viewing angle limiting sheet 120 again, and then enters the near-infrared light sensor. The detector 130 generates an image of the subject.

與前一實施例相似，因為採用了面光源110且限制了發散角A12小於等於120度，再搭配可視角A14小於等於60度的視角限制片120，所以可得到清晰的血管影像，也很容易達成大面積拍攝的目的。如此一來，不需要拉大拍攝距離而導致系統的整體體積過大，也無須分區進行多次拍攝。並且，還可進一步減少血管成像系統200的整體厚度。Similar to the previous embodiment, because the surface light source 110 is used and the divergence angle A12 is limited to less than or equal to 120 degrees, and the angle of view limiting film 120 with the viewing angle A14 less than or equal to 60 degrees is used, a clear blood vessel image can be obtained and it is easy To achieve the purpose of large-scale shooting. In this way, there is no need to extend the shooting distance and cause the overall volume of the system to be too large, and there is no need to partition for multiple shooting. In addition, the overall thickness of the vascular imaging system 200 can be further reduced.

在本實施例中，血管成像系統200可更包括一近紅外光濾光片240。近紅外光感測器130疊置於面光源與近紅外光濾光片240之間，且近紅外光濾光片240疊置於近紅外光感測器130與視角限制片120之間。如此，可降低環境光進入近紅外光感測器130的光量，進而提升影像品質。In this embodiment, the blood vessel imaging system 200 may further include a near-infrared light filter 240. The near-infrared light sensor 130 is stacked between the surface light source and the near-infrared light filter 240, and the near-infrared light filter 240 is stacked between the near-infrared light sensor 130 and the viewing angle limiting sheet 120. In this way, the amount of ambient light entering the near-infrared light sensor 130 can be reduced, thereby improving the image quality.

本實施例的近紅外光感測器130的感測面132例如是朝向視角限制片120，因此面光源110發出的光線在受到被攝物反射前不會入射近紅外光感測器130。The sensing surface 132 of the near-infrared light sensor 130 of this embodiment is, for example, facing the viewing angle limiting sheet 120, so the light emitted by the surface light source 110 will not enter the near-infrared light sensor 130 before being reflected by the subject.

圖5是依照本發明的又一實施例的血管成像系統的使用狀態示意圖。請參照圖5，本實施例的血管成像系統200與圖4的實施例相似，在此僅說明兩者的差異處，其餘相似處在此不再贅述。在本實施例中，視角限制片120疊置於近紅外光感測器130與近紅外光濾光片240之間。如此，同樣可降低環境光進入近紅外光感測器130的光量，進而提升影像品質。Fig. 5 is a schematic diagram of a use state of a vascular imaging system according to another embodiment of the present invention. Please refer to FIG. 5, the blood vessel imaging system 200 of this embodiment is similar to the embodiment of FIG. 4, and only the differences between the two are described here, and the rest of the similarities are not repeated here. In this embodiment, the viewing angle limiting sheet 120 is stacked between the near-infrared light sensor 130 and the near-infrared light filter 240. In this way, the amount of ambient light entering the near-infrared light sensor 130 can also be reduced, thereby improving the image quality.

綜上所述，在本發明的血管成像系統中，藉由面光源的發散角與視角限制片的可視角的配合，可在較短的拍攝距離下取得清晰的血管影像。因此，可在較短的拍攝距離下完成拍攝。並且，只要加大系統的面積，就可以一次完成大面積的拍攝，而無須分區進行多次拍攝。In summary, in the blood vessel imaging system of the present invention, by combining the divergence angle of the surface light source and the viewing angle of the viewing angle limiting sheet, a clear blood vessel image can be obtained at a short shooting distance. Therefore, shooting can be completed at a short shooting distance. Moreover, as long as the area of the system is increased, a large area can be shot at one time, without the need for multiple shots in partitions.

100、200、300:血管成像系統 110:面光源 112:發光面 120:視角限制片 122:導光柱 130、230:近紅外光感測器 132:感測區 A12:發散角 A14:可視角 232:遮光牆 240:濾光片 100, 200, 300: vascular imaging system 110: Surface light source 112: light-emitting surface 120: viewing angle limit film 122: light guide 130, 230: Near-infrared light sensor 132: Sensing area A12: Divergence angle A14: Viewable 232: Shading Wall 240: filter

圖1是依照本發明的一實施例的血管成像系統的使用狀態示意圖。 圖2是圖1的血管成像系統的視角限制片的局部示意圖。 圖3是依照本發明的另一實施例的血管成像系統的視角限制片的局部示意圖。 圖4是依照本發明的再一實施例的血管成像系統的使用狀態示意圖。 圖5是依照本發明的又一實施例的血管成像系統的使用狀態示意圖。 Fig. 1 is a schematic diagram of a use state of a vascular imaging system according to an embodiment of the present invention. Fig. 2 is a partial schematic diagram of a viewing angle limiting sheet of the vascular imaging system of Fig. 1. Fig. 3 is a partial schematic diagram of a viewing angle limiting sheet of a vascular imaging system according to another embodiment of the present invention. Fig. 4 is a schematic diagram of a use state of a vascular imaging system according to still another embodiment of the present invention. Fig. 5 is a schematic diagram of a use state of a vascular imaging system according to another embodiment of the present invention.

100:血管成像系統 100: Vascular imaging system

110:面光源 110: Surface light source

112:發光面 112: light-emitting surface

120:視角限制片 120: viewing angle limit film

130:近紅外光感測器 130: Near infrared light sensor

132:感測區 132: Sensing area

A12:發散角 A12: Divergence angle

A14:可視角 A14: Viewable

Claims (13)

一種血管成像系統，包括： 一面光源，提供發散角小於等於120度的光線； 一視角限制片，其可視角小於等於60度；以及 一近紅外光感測器，其中該視角限制片疊置於該面光源與該近紅外光感測器之間，或者該近紅外光感測器疊置於該面光源與該視角限制片之間。 A vascular imaging system includes: A surface light source provides light with a divergence angle of less than or equal to 120 degrees; A viewing angle limiting film, the viewing angle of which is less than or equal to 60 degrees; and A near-infrared light sensor, wherein the viewing angle limiting sheet is stacked between the surface light source and the near-infrared light sensor, or the near-infrared light sensor is stacked between the surface light source and the viewing angle limiting sheet between. 如請求項1所述的血管成像系統，更包括一近紅外光濾光片，其中該近紅外光感測器疊置於該面光源與該近紅外光濾光片之間，且該近紅外光濾光片疊置於該近紅外光感測器與該視角限制片之間。The blood vessel imaging system according to claim 1, further comprising a near-infrared light filter, wherein the near-infrared light sensor is stacked between the surface light source and the near-infrared light filter, and the near-infrared light The optical filter is stacked between the near-infrared light sensor and the viewing angle limiting sheet. 如請求項1所述的血管成像系統，更包括一近紅外光濾光片，其中該近紅外光感測器疊置於該面光源與該近紅外光濾光片之間，且該視角限制片疊置於該近紅外光感測器與該近紅外光濾光片之間。The blood vessel imaging system according to claim 1, further comprising a near-infrared light filter, wherein the near-infrared light sensor is stacked between the surface light source and the near-infrared light filter, and the viewing angle is limited The sheet is stacked between the near-infrared light sensor and the near-infrared light filter. 如請求項2或請求項3所述的血管成像系統，其中該近紅外光感測器的感測面朝向該視角限制片。The vascular imaging system according to claim 2 or claim 3, wherein the sensing surface of the near-infrared light sensor faces the viewing angle limiting sheet. 如請求項1所述的血管成像系統，其中該近紅外光感測器的感測區呈矩形，且其任一邊長大於等於9公分。The vascular imaging system according to claim 1, wherein the sensing area of the near-infrared light sensor is rectangular, and any side length thereof is greater than or equal to 9 cm. 如請求項1所述的血管成像系統，其中該視角限制片疊置於該面光源與該近紅外光感測器之間，該面光源與該近紅外光感測器之間的距離介於3公分至6公分。The vascular imaging system according to claim 1, wherein the viewing angle limiting sheet is stacked between the surface light source and the near-infrared light sensor, and the distance between the surface light source and the near-infrared light sensor is between 3 cm to 6 cm. 如請求項1所述的血管成像系統，其中該面光源的發光面完全覆蓋該近紅外光感測器的感測區。The vascular imaging system according to claim 1, wherein the light-emitting surface of the surface light source completely covers the sensing area of the near-infrared light sensor. 如請求項1所述的血管成像系統，其中該面光源發光時，在距離該面光源6公分處的光強度大於等於1 mW/cm 2。 The vascular imaging system according to claim 1, wherein when the surface light source emits light, the light intensity at a distance of 6 cm from the surface light source is greater than or equal to 1 mW/cm 2 . 如請求項1所述的血管成像系統，其中該視角限制片由多根導光柱陣列排列而成。The vascular imaging system according to claim 1, wherein the viewing angle limiting sheet is formed by arranging a plurality of light guide rod arrays. 如請求項1所述的血管成像系統，其中該視角限制片內具有平行且等距排列的多個遮光牆。The blood vessel imaging system according to claim 1, wherein the viewing angle limiting sheet has a plurality of light-shielding walls arranged in parallel and equidistantly. 如請求項1所述的血管成像系統，其中該視角限制片直接接觸該近紅外光感測器。The vascular imaging system according to claim 1, wherein the viewing angle limiting sheet directly contacts the near-infrared light sensor. 如請求項1所述的血管成像系統，其中該視角限制片完全覆蓋該近紅外光感測器的感測區。The vascular imaging system according to claim 1, wherein the viewing angle limiting sheet completely covers the sensing area of the near-infrared light sensor. 如請求項1所述的血管成像系統，其中該視角限制片的正向光穿透率大於50%。The vascular imaging system according to claim 1, wherein the forward light transmittance of the viewing angle limiting sheet is greater than 50%.
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