WO2010116964A1 - 生体光計測装置及び光ファイバの断線判定方法 - Google Patents
生体光計測装置及び光ファイバの断線判定方法 Download PDFInfo
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- WO2010116964A1 WO2010116964A1 PCT/JP2010/056150 JP2010056150W WO2010116964A1 WO 2010116964 A1 WO2010116964 A1 WO 2010116964A1 JP 2010056150 W JP2010056150 W JP 2010056150W WO 2010116964 A1 WO2010116964 A1 WO 2010116964A1
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- Prior art keywords
- optical fiber
- gain value
- gain
- unit
- disconnection
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 231
- 238000000034 method Methods 0.000 title claims description 13
- 238000001514 detection method Methods 0.000 claims abstract description 123
- 238000005259 measurement Methods 0.000 claims abstract description 97
- 238000012545 processing Methods 0.000 claims abstract description 13
- 238000007689 inspection Methods 0.000 claims description 45
- 230000003287 optical effect Effects 0.000 claims description 15
- 238000004088 simulation Methods 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 4
- 238000005375 photometry Methods 0.000 abstract 3
- 239000000523 sample Substances 0.000 description 51
- 102000001554 Hemoglobins Human genes 0.000 description 9
- 108010054147 Hemoglobins Proteins 0.000 description 9
- 238000003780 insertion Methods 0.000 description 8
- 230000037431 insertion Effects 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000002950 deficient Effects 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 230000017531 blood circulation Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000004 hemodynamic effect Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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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
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1495—Calibrating or testing of in-vivo probes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/08—Testing mechanical properties
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/02—Operational features
- A61B2560/0223—Operational features of calibration, e.g. protocols for calibrating sensors
- A61B2560/0228—Operational features of calibration, e.g. protocols for calibrating sensors using calibration standards
- A61B2560/0233—Optical standards
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/02—Operational features
- A61B2560/0266—Operational features for monitoring or limiting apparatus function
- A61B2560/0276—Determining malfunction
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/22—Arrangements of medical sensors with cables or leads; Connectors or couplings specifically adapted for medical sensors
- A61B2562/221—Arrangements of sensors with cables or leads, e.g. cable harnesses
- A61B2562/223—Optical cables therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/22—Arrangements of medical sensors with cables or leads; Connectors or couplings specifically adapted for medical sensors
- A61B2562/225—Connectors or couplings
- A61B2562/228—Sensors with optical connectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/102—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type for infrared and ultraviolet radiation
Definitions
- the present invention irradiates a subject with near-infrared light, measures the light passing through the subject or reflected inside the subject, and measuring the blood circulation, hemodynamics, and hemoglobin change, and an optical fiber It is related with the disconnection determination method.
- a biological light measurement device is a device that can measure blood circulation, hemodynamics, and changes in the amount of hemoglobin inside a subject with low restraint and no harm to the subject.
- biological light measurement devices have been realized to image measurement data using a multi-channel device, and are expected to be applied clinically.
- the living body light measurement device of Patent Document 1 includes an irradiation position and a detection position corresponding to a measurement position where the light amount detected from the light measurement unit is insufficient, and an irradiation position corresponding to the measurement position where the light amount reaches an allowable value. And displaying on the display unit by a display method different from the detection position. (For example, Patent Document 1).
- the failure site is determined based on whether or not the amount of light detected from the optical measurement unit is insufficient with the probe attached to the subject. In the determination of the failure site due to the lack of light quantity in the state where the probe is attached to the subject, it is considered that it cannot be determined whether the cause of the failure is due to the disconnection of the optical fiber.
- An object of the present invention is to provide a biological light measuring device and an optical fiber break determination method capable of accurately grasping the disconnection state of an optical fiber.
- a light source unit including an irradiation optical fiber that irradiates near infrared light, an optical measurement unit including a detection optical fiber that measures passing light at a plurality of measurement points of a subject, Detected by the optical measurement unit in a biological optical measurement device comprising a signal processing unit that processes and images measurement data output from the optical measurement unit, and a display unit that displays measurement data of the signal processing unit
- a gain adjustment unit that sets a gain value in the measured data based on the amount of the passing light, and a disconnection gain that is set by the gain adjustment unit when a disconnected irradiation optical fiber or detection optical fiber is used.
- a gain storage unit that stores a value
- a gain comparison unit that compares a gain value set by the gain adjustment unit with a disconnection gain value stored in the gain storage unit, and a comparison result of the gain comparison unit
- a said irradiation optical fiber or the determining disconnection judging whether the detection optical fiber is broken portion wherein the display unit displays a tomographic line state. Therefore, the operator can determine which optical fiber is disconnected.
- a step of setting a gain value based on the amount of passing light in measurement data detected by optical measurement, and a disconnection gain value set when using a disconnected irradiation optical fiber or detection optical fiber The step of storing, the step of comparing the gain value and the disconnection gain value, and the comparison result of the gain value and the disconnection gain value indicate whether or not the irradiation optical fiber or the detection optical fiber is disconnected.
- An optical fiber breakage determination method including a determination step.
- the block diagram which shows the biological light measuring device of this invention.
- the perspective view which shows the test
- Sectional drawing which shows the test
- 2 is a flowchart showing the operation of the first embodiment of the present invention.
- 7 is a flowchart showing the operation of Embodiment 2 of the present invention.
- 6 is a graph for explaining Example 3 of the present invention.
- FIG. 1 is a block diagram showing a biological light measuring device of the present invention.
- a probe holder 4 is attached to the head of a subject 2.
- Near-infrared light generated by the light source unit 10 is irradiated onto the subject 2 via a plurality of irradiation optical fibers 6a.
- the tip of each irradiation optical fiber 6 a is attached to the probe holder 4 via the irradiation probe 6.
- the light source unit 10 includes a semiconductor laser 16 that emits light of a predetermined wavelength, and a plurality of optical modules 18 that modulate light from the semiconductor laser 16.
- Each optical module 18 has a modulator (not shown) that modulates light from the semiconductor laser 16 at different frequencies.
- the wavelength of light depends on the spectral characteristics of the substance of interest in the living body, but when measuring oxygen saturation and blood volume from the concentration of Hb and HbO2, one or more wavelengths are selected from the wavelength range of 600 nm to 1400 nm. To be used.
- the light irradiated to the subject 2 from the irradiation optical fiber 6a and passed through the subject 2 is sent to the optical measurement unit 12 via the plurality of detection optical fibers 8a.
- the tip of each detection optical fiber 8a is attached to the probe holder 4 via the detection probe 8.
- the probe holder 4 holds a plurality of irradiation probes 6 and a plurality of detection probes 8.
- the irradiation probes 6 and the detection probes 8 are alternately arranged in a matrix.
- the optical measuring unit 12 selectively selects a plurality of photoelectric conversion elements 28 such as photodiodes that generate an electric signal according to the detected amount of passing light, and a corresponding modulation signal from the electric signal from the photoelectric conversion element 28.
- the lock-in amplifier module 30 to detect, the A / D converter 32 that converts the output signal of the lock-in amplifier module 30 into digital measurement data, and a gain value to the measurement data based on the amount of detected passing light A gain adjusting unit 40.
- the lock-in amplifier module 30 selectively detects modulation signals corresponding to these two wavelengths. As a result, a hemoglobin amount change signal that is twice the number of channels is obtained for the measurement position located between the irradiation position of the light from the irradiation optical fiber 6a and the detection position of the passing light by the detection optical fiber 8a. It is done.
- the gain adjusting unit 40 applies a gain value to the measurement data output from the A / D converter 32 based on the electrical signal based on the light amount of the passing light detected by the plurality of photoelectric conversion elements 28.
- the control unit 14 is configured by a computer, for example.
- the signal processing unit 34 processes the hemoglobin amount change signal, and plots a graph showing, for each channel, oxygenated hemoglobin concentration change, deoxygenated hemoglobin concentration change, total hemoglobin concentration change, etc., on the two-dimensional image of the subject 2 Create measurement data for
- the storage unit 38 records measurement data necessary for processing by the signal processing unit 34 and analysis results of the measurement data.
- Various commands necessary for the operation of the control unit 14 are input to the operation unit 39.
- the signal processing unit 34 is connected to a display unit 36 that displays measurement data created by the signal processing unit 34 and analysis results of the measurement data.
- the display unit 36 displays the measurement data created by the signal processing unit 34.
- a storage unit 44 that stores the disconnection gain value set by the gain adjustment unit 40 when the disconnected irradiation optical fiber 6a or the detection optical fiber 8a is used, and the irradiation optical fiber 6a used in the main measurement.
- the gain comparison unit 42 for comparing the gain value set by the gain adjustment unit 40 with the measurement data obtained using the detection optical fiber 8a and the disconnection gain value stored in the storage unit 44, and the comparison result of the gain comparison unit Accordingly, a disconnection determination unit 46 that determines whether the irradiation optical fiber 6a or the detection optical fiber 8a is disconnected is provided. Then, the disconnection state determined by the disconnection determination unit 46 is displayed on the display unit 36.
- Each component such as the light source unit 10 and the optical measurement unit 12 is controlled by the control unit 14.
- FIG. 2 is a perspective view showing an inspection device of a biological light measurement device.
- the biological light measurement device is provided with an inspection device for inspecting the irradiation optical fiber 6a and the detection optical fiber 8a.
- a holder insertion hole 50 is provided on the wall surface of the body of the biological optical measurement device. In the holder insertion hole 50, the base end portion of the flat inspection holder 52 is inserted.
- the inspection holder 52 is pulled out of the main body as shown in FIG. 2 at the time of inspection, and is pushed into the main body and accommodated at the time of non-inspection. That is, the inspection holder 52 can be slid horizontally between the inspection position and the storage position.
- a plurality of irradiation probe mounting portions (mounting holes) 54 and a plurality of detection probe mounting portions (mounting holes) 56 are provided on the upper portion of the inspection holder 52.
- the irradiation probe mounting portion 54 is indicated by a solid line
- the detection probe mounting portion 56 is indicated by a broken line.
- the irradiation probe mounting part 54 and the detection probe mounting part 56 are arranged in a matrix at a predetermined interval (for example, 30 mm).
- Each irradiation probe mounting portion 54 is mounted (inserted) with an irradiation probe 6 for irradiating light.
- Each detection probe mounting portion 56 is mounted (inserted) with a detection probe 8 for receiving the passed light.
- an inspection body insertion hole 58 as an inspection body mounting portion facing the irradiation probe mounting portion 54 and the detection probe mounting portion 56 is provided.
- the irradiation probe mounting portion 54 and the detection probe mounting portion 56 communicate with the inspection object insertion hole 58.
- the inspection object insertion hole 58 is opened at the front surface of the inspection holder 52.
- the inspection object insertion hole 58 a plurality of types of inspection objects that output different information for performing inspections regarding light irradiation and light receiving states by receiving light from the irradiation probe 6 mounted on the irradiation probe mounting portion 54. Is selectively inserted.
- the light detection inspection body 60 or the light intensity inspection body 60 is inserted into the inspection body insertion hole 58 as the inspection body.
- FIG. 3 is a cross-sectional view showing the inspection apparatus of the biological light measurement apparatus, and shows a state where the light detection inspection body 60 is inserted into the inspection body insertion hole 58 of FIG.
- the light detection inspection body 60 attenuates the light from the irradiation probe 6 to pass through, and causes the detection probe 8 to receive the passing light (information for performing inspection). That is, the light detection inspection body 60 is composed of a flat light scatterer and functions as a living body simulation sample (phantom). By measuring the light passing through the light detection inspection body 60 and received by the detection probe 8, the operation of the entire apparatus can be inspected.
- the irradiation probe 6 is mounted (inserted) on each irradiation probe mounting portion 54, and the detection probe 8 is mounted (inserted) on each detection probe mounting portion 56 in a state where the inspection device of the biological light measurement device is used. Executed when.
- the storage unit 44 The disconnection gain value set by the gain adjustment unit 40 is stored in advance using the disconnected irradiation optical fiber 6a or detection optical fiber 8a. Further, when measuring the light irradiated from the irradiation probe 6 (irradiation optical fiber 6a) passing through the light detection inspection body 60 and received by the detection probe 8 (detection optical fiber 8a), the gain comparison unit 42 Compares the gain value set by the gain adjustment unit 40 with the disconnection gain value stored in the storage unit 44. The disconnection determination unit 46 determines whether or not the irradiation optical fiber 6a or the detection optical fiber 8a is disconnected based on the comparison result of the gain comparison unit.
- the gain value of the gain adjustment unit 40 that is set when the light emitted from the irradiation probe 6 passes through the light detection inspection body 60 and is received by the detection probe 8 is determined to make the detected light amount uniform.
- Gain The gain value is for improving the S / N ratio and ensuring the reliability of the measured value.
- the gain adjusting unit 40 applies a gain value to the measurement data so that the detected light amounts of the plurality of photoelectric conversion elements 28 are uniformized at 2 mW.
- the gain value applied to the measurement data becomes large (for example, 1 or more), and when the detected light quantity is large (for example, 2 mW or more), the gain value applied to the measurement data becomes small ( For example, 1 or less).
- the storage unit 44 stores the disconnection gain value set by the gain adjustment unit 40 using the disconnected irradiation optical fiber 6a or detection optical fiber 8a.
- the disconnection gain value is a gain value set by the gain adjusting unit 40 in a state where the irradiation optical fiber 6a or the detection optical fiber 8a is disconnected.
- the control unit 14 determines that 20% of the light A disconnection gain value is obtained in advance using the irradiation optical fiber 6a or the detection optical fiber 8a in which the fiber is disconnected.
- the number of optical fibers is counted using a microscope (installed type), a portable light, and a microscope (not shown).
- a microscope installation type
- a portable light illuminate one end surface of the optical fiber with the portable light and magnify the other end surface of the optical fiber with a microscope (approximately 200 times) and disconnect from the captured image.
- the end face of an optical fiber is imaged through the microscope, and the number of disconnected optical fibers is measured from the captured image.
- the binarization process is performed on the luminance (color information) independently for each pixel.
- the binarization process is a process of converting the luminance of each pixel into two values of black and white according to a certain reference value. An optical fiber in which black is broken and an optical fiber in which white is not broken.
- the control unit 14 calculates the ratio of the number of black pixels to the total number of pixels of the captured image.
- the ratio of the number of black pixels to the total number of pixels in the captured image is calculated as 10%, 10% of the irradiation optical fiber 6a or the detection optical fiber 8a is disconnected.
- the ratio of the number of black pixels to the total number of pixels in the captured image is calculated to be 20%, 20% of the irradiation optical fiber 6a or the detection optical fiber 8a is disconnected.
- the control unit 14 calculates the gain value set by the gain adjustment unit 40 using the irradiation optical fiber 6a or the detection optical fiber 8a in which 20% of the optical fibers are disconnected. Then, the control unit 14 stores the gain value in the gain storage unit 44 as a disconnection gain value.
- the gain comparison unit 42 stores the gain value set by the gain adjustment unit 40 in the measurement data obtained using the irradiation optical fiber 6a and the detection optical fiber 8a used in the main measurement, and the storage unit 44. Compare with disconnection gain value. Specifically, the disconnection determination unit 46 determines whether the gain value of the optical fiber used in this measurement is higher or lower than the disconnection gain value.
- the disconnection determination unit 46 When the gain value applied to the measurement data obtained by using the irradiation optical fiber 6a and the detection optical fiber 8a used in the main measurement is higher than the disconnection gain value, the disconnection determination unit 46 is used for the irradiation optical fiber 6a used in the main measurement or The detection optical fiber 8a is determined to be disconnected (defective). When the gain value applied to the measurement data obtained by using the irradiation optical fiber 6a and the detection optical fiber 8a used in the main measurement is lower than the disconnection gain value, the disconnection determination unit 46 uses the irradiation optical fiber 6a used in the main measurement or It is determined that the detection optical fiber 8a is not disconnected (normal).
- the display unit 36 displays the disconnection information together with the position information of the irradiation optical fiber 6a or the detection optical fiber 8a as shown in FIG.
- FIG. 4 is a screen on which disconnection information of the irradiation optical fiber 6a or the detection optical fiber 8a is displayed together with position information.
- the irradiation optical fiber 6a is an optical fiber shown at positions 1, 3, 6, 8, 9, 11, 14, and 16.
- the detection optical fiber 8a is an optical fiber indicated at positions 2, 4, 5, 7, 10, 12, 13, and 15.
- the control unit 14 displays the number of the irradiation optical fiber 6a or the detection optical fiber 8a on which the mark 70 is displayed at four positions on the display unit 36, so that the operator can determine which optical fiber is disconnected. Judgment can be made.
- the display unit 36 Since the disconnected irradiation optical fiber 6a or the detection optical fiber 8a needs to be replaced, the display unit 36 gives a warning together with the position information of the disconnected irradiation optical fiber 6a or the detection optical fiber 8a. Display information. Further, the display unit 36 can also display a replacement method of the disconnected irradiation optical fiber 6a or detection optical fiber 8a, a contact information of a maintenance company, and the like.
- step 1 An irradiation probe 6 and a detection probe 8 used in this measurement are inserted into an inspection holder 52 that is composed of a flat light scatterer and has a light detection inspection body 60 of a living body simulation sample (phantom).
- Step 2 The gain comparison unit 42 acquires the gain value set by the gain adjustment unit 40 in the measurement data obtained using the irradiation optical fiber 6a and the detection optical fiber 8a used in the main measurement, and stores them in the gain storage unit 44 in advance. Compare with the obtained disconnection gain value.
- Step 3 When the gain value applied to the measurement data obtained using the irradiation optical fiber 6a and the detection optical fiber 8a used in the main measurement is higher than the disconnection gain value obtained in advance, the disconnection determination unit 46 is used for the irradiation used in the main measurement.
- the optical fiber 6a or the detection optical fiber 8a is determined to be disconnected (defective).
- Step 4 The display unit 36 displays warning information as well as position information on the disconnected irradiation optical fiber 6a or detection optical fiber 8a. Specifically, the display unit 36 displays the number of the irradiation optical fiber 6a or the detection optical fiber 8a in which the marks 70 are displayed at the four surrounding locations. As described above, according to the present invention, the operator can accurately grasp the disconnection state of the irradiation optical fiber 6a or the detection optical fiber 8a. The operator can replace the disconnected irradiation optical fiber 6a or detection optical fiber 8a as appropriate.
- Example 2 will be described with reference to FIG.
- the difference from the first embodiment is that not only the disconnection state of the optical fiber but also the optical fiber that is likely to be disconnected can be grasped.
- the control unit 14 uses the gain adjustment unit 40. Calculate the disconnection gain value set in.
- control unit 14 uses the irradiation optical fiber 6a or the detection optical fiber 8a that is likely to be disconnected, that is, the irradiation optical fiber 6a or the detection optical fiber 8a in which 10% of the optical fibers are disconnected. Calculate the attention gain value set by.
- the gain storage unit 44 stores the disconnection gain value and the attention gain value.
- step 1 An irradiation probe 6 and a detection probe 8 used in this measurement are inserted into an inspection holder 52 that is composed of a flat light scatterer and has a light detection inspection body 60 of a living body simulation sample (phantom).
- Step 2 The gain comparison unit 42 acquires the gain value set by the gain adjustment unit 40 in the measurement data obtained using the irradiation optical fiber 6a and the detection optical fiber 8a used in the main measurement, and stores them in the gain storage unit 44 in advance. Compare the disconnection gain value and the attention gain value.
- Step 3 When the gain value applied to the measurement data obtained using the irradiation optical fiber 6a and the detection optical fiber 8a used in the main measurement is higher than the pre-stored disconnection gain value, the disconnection determination unit 46 is used for the irradiation used in the main measurement.
- the optical fiber 6a or the detection optical fiber 8a is determined to be disconnected (defective).
- Step 4 When the gain value applied to the measurement data obtained by using the irradiation optical fiber 6a and the detection optical fiber 8a used in the main measurement is higher than the pre-stored attention gain value, the disconnection determination unit 46 is used for the irradiation used in the main measurement. It is determined that the optical fiber 6a or the detection optical fiber 8a is likely to break.
- Step 5 The display unit 36 displays warning information as well as position information on the disconnected irradiation optical fiber 6a or detection optical fiber 8a.
- the display unit 36 displays caution information together with position information on the irradiation optical fiber 6a or the detection optical fiber 8a that is likely to be disconnected. Specifically, the display unit 36 displays the number of the irradiation optical fiber 6a or the detection optical fiber 8a in which the marks 70 are displayed at the four surrounding locations.
- Example 2 the caution display and the warning display are performed in two stages using the caution gain value and the disconnection gain value. However, the warning display and the caution display may be performed in three or more stages.
- the operator since the operator is warned and alerted in a plurality of stages, before the disconnection of the irradiation optical fiber 6a or the detection optical fiber 8a occurs, the irradiation optical fiber 6a or It is possible to grasp the detection optical fiber 8a. The operator can appropriately replace the disconnected optical fiber 6a or the detection optical fiber 8a that is likely to be disconnected.
- Example 3 will be described.
- the difference from the first and second embodiments is that the history of the disconnection state of the optical fiber makes it possible to grasp the optical fiber that is likely to be disconnected.
- FIG. 7 is a graph showing a time transition of gain values of a certain irradiation optical fiber 6a and detection optical fiber 8a. Case 1 corresponds to deterioration with time of the optical fiber, and case 2 corresponds to excessive load on the optical fiber.
- the irradiation optical fiber 6a or the detection optical fiber 8a that is not disconnected is prepared. This is a so-called product delivery state.
- the control unit 14 sets the gain value set by the gain adjustment unit 40 to the measurement data obtained using the irradiation optical fiber 6a and the detection optical fiber 8a used in the main measurement after 300 days, 600 days from the delivery date. Get.
- the storage unit 44 stores gain values acquired over time. In this manner, the storage unit 44 stores gain values acquired over time for the channels of the irradiation optical fiber 6a and the detection optical fiber 8a.
- the irradiation optical fiber 6a and the detection optical fiber 8a are inspected once every 300 days. It can be seen that the acquired gain value gradually increases. This is because the irradiation optical fiber 6a and the detection optical fiber 8a deteriorate over time.
- the disconnection determination unit 46 calculates a day exceeding the attention gain value and the disconnection gain value from the transition of the gain value stored in the storage unit 44. Specifically, the disconnection determination unit 46 calculates the day when the gain value stored in the storage unit 44 exceeds the attention gain value and the disconnection gain value before reaching the attention gain value.
- the disconnection determination unit 46 calculates a date exceeding the attention gain value and the disconnection gain value based on the relationship between the delivery date of the product and the initial gain value, and the gain value acquired 300 days after the delivery date.
- the disconnection determination unit 46 predicts that the gain value will not exceed the attention gain value and the disconnection gain value in the next inspection (after 600 days) based on the gain value obtained and the slope after 300 days from the delivery date. To do. Therefore, here, warning display and caution display are not performed on the display unit 36.
- the disconnection determination unit 46 determines that the gain value does not exceed the attention gain value and the disconnection gain value in the next inspection (after 900 days) based on the gain value and the slope obtained after 600 days from the delivery date. Predict. Therefore, here, warning display and caution display are not performed on the display unit 36. Then, the disconnection determination unit 46 predicts that the gain value exceeds the attention gain value in the next inspection (after 1200 days) based on the gain value acquired at 900 days after the delivery date and the inclination thereof. The disconnection determination unit 46 then displays a caution on the display unit 36.
- the disconnection determination unit 46 predicts that the gain value exceeds the disconnection gain value in the next inspection (after 1500 days) based on the gain value acquired after 1200 days from the delivery date and the inclination thereof.
- the disconnection determination unit 46 displays a warning on the display unit 36.
- the history of the disconnection state of the optical fiber allows the operator to cope with the deterioration with time of the optical fiber, so that it is possible to grasp the optical fiber that is likely to be disconnected.
- the gain value set by the gain adjusting unit 40 is acquired in the measurement data obtained using the irradiation optical fiber 6a and the detection optical fiber 8a used in the main measurement.
- the storage unit 44 stores gain values acquired over time. It can be seen that the gain value acquired over time increases rapidly from 300 days to 600 days after the delivery date. This is presumably because an excessive load was applied to the irradiation optical fiber 6a or the detection optical fiber 8a.
- the disconnection determination unit 46 If the slope based on the gain value after 300 days from the delivery date and the gain value after 600 days is equal to or greater than a predetermined value, the disconnection determination unit 46 is given an excessive load on the irradiation optical fiber 6a or the detection optical fiber 8a, It is determined that the optical fibers of the book are disconnected together. The disconnection determination unit 46 displays a caution on the display unit 36 when an excessive load is applied to the corresponding irradiation optical fiber 6a or detection optical fiber 8a.
- the history of the disconnection state of the optical fiber allows the operator to cope with an excessive load on the optical fiber, it is possible to accurately grasp the optical fiber that is likely to be disconnected. .
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Abstract
Description
本発明は、光ファイバの断線状態を正確に把握することができる生体光計測装置及び光ファイバの断線判定方法を提供することを目的とする。
表示部36は、断線している照射用光ファイバ6a若しくは検出用光ファイバ8aを位置情報とともに断線情報を図4のように表示する。図4は、照射用光ファイバ6a若しくは検出用光ファイバ8aの断線情報を位置情報とともに表示された画面である。
(ステップ1)
平板状の光散乱体から構成され、生体模擬試料(ファントム)の光検出検査体60を有した検査ホルダ52に、本計測で用いる照射プローブ6と検出プローブ8を挿入する。
ゲイン比較部42は、本計測で用いる照射用光ファイバ6a及び検出用光ファイバ8aを用いて得られる計測データにゲイン調整部40で設定されたゲイン値を取得し、予めゲイン記憶部44に記憶された断線ゲイン値と比較する。
断線判定部46は、本計測で用いる照射用光ファイバ6a及び検出用光ファイバ8aを用いて得られる計測データにかけられるゲイン値が予め得られた断線ゲイン値より高い場合、本計測で用いる照射用光ファイバ6a若しくは検出用光ファイバ8aは、断線している(不良)判定する。
表示部36は、断線している照射用光ファイバ6a若しくは検出用光ファイバ8aを位置情報とともに警告情報を表示する。具体的には、表示部36は、周囲4箇所にマーク70が表示された照射用光ファイバ6a若しくは検出用光ファイバ8aのナンバーを表示する。
以上、本発明によれば、操作者は、照射用光ファイバ6a若しくは検出用光ファイバ8aの断線状態を正確に把握することができる。操作者は、断線した照射用光ファイバ6a若しくは検出用光ファイバ8aを適宜交換することができる。
そして、実施例2の動作について図6を用いて説明する。
平板状の光散乱体から構成され、生体模擬試料(ファントム)の光検出検査体60を有した検査ホルダ52に、本計測で用いる照射プローブ6と検出プローブ8を挿入する。
ゲイン比較部42は、本計測で用いる照射用光ファイバ6a及び検出用光ファイバ8aを用いて得られる計測データにゲイン調整部40で設定されたゲイン値を取得し、予めゲイン記憶部44に記憶された断線ゲイン値と注意ゲイン値と比較する。
断線判定部46は、本計測で用いる照射用光ファイバ6a及び検出用光ファイバ8aを用いて得られる計測データにかけられるゲイン値が予め記憶された断線ゲイン値より高い場合、本計測で用いる照射用光ファイバ6a若しくは検出用光ファイバ8aは、断線している(不良)判定する。
断線判定部46は、本計測で用いる照射用光ファイバ6a及び検出用光ファイバ8aを用いて得られる計測データにかけられるゲイン値が予め記憶された注意ゲイン値より高い場合、本計測で用いる照射用光ファイバ6a若しくは検出用光ファイバ8aは、断線しそうである判定する。
表示部36は、断線している照射用光ファイバ6a若しくは検出用光ファイバ8aを位置情報とともに警告情報を表示する。表示部36は、断線しそうな照射用光ファイバ6a若しくは検出用光ファイバ8aを位置情報とともに注意情報を表示する。具体的には、表示部36は、周囲4箇所にマーク70が表示された照射用光ファイバ6a若しくは検出用光ファイバ8aのナンバーを表示する。
納入日から300日後、600日後・・・に、本計測で用いる照射用光ファイバ6a及び検出用光ファイバ8aを用いて得られる計測データにゲイン調整部40で設定されたゲイン値を制御部14は取得する。そして、記憶部44は、経時的に取得されたゲイン値を記憶する。このように、記憶部44は、照射用光ファイバ6a及び検出用光ファイバ8aのチャンネル分、経時的に取得されたゲイン値を記憶する。
そして、断線判定部46は、納入日から900日後時点の取得されたゲイン値とその傾きに基づいて、次回(1200日後)の検査で、ゲイン値が注意ゲイン値を超えることを予測する。そして、断線判定部46は、表示部36に注意表示を行なう。
納入日から300日後、600日後・・・に、本計測で用いる照射用光ファイバ6a及び検出用光ファイバ8aを用いて得られる計測データにゲイン調整部40で設定されたゲイン値を取得する。そして、記憶部44は、経時的に取得されたゲイン値を記憶する。経時的に取得されたゲイン値は、納入日から300日後から600日後に亘り、急激に高くなっていることが分かる。これは、照射用光ファイバ6a若しくは検出用光ファイバ8aに過剰負荷が与えられたためと考えられる。
Claims (13)
- 近赤外光を照射する照射用光ファイバを含む光源部と、被検体の複数の測定点における通過光を計測する検出用光ファイバを含む光計測部と、前記光計測部から出力される計測データを処理して画像化する信号処理部と、前記計測データを表示する表示部とを備えた生体光計測装置において、
前記光計測部で検出された計測データに前記通過光の光量に基づいてゲイン値を設定するゲイン調整部と、断線された照射用光ファイバ若しくは検出用光ファイバを用いた際に前記ゲイン調整部で設定される断線ゲイン値を記憶するゲイン記憶部と、前記ゲイン調整部で設定されたゲイン値と前記ゲイン記憶部に記憶された断線ゲイン値とを比較するゲイン比較部と、前記ゲイン比較部の比較結果により、前記照射用光ファイバ若しくは前記検出用光ファイバが断線しているか否かを判定する断線判定部とを備え、前記表示部は該断線状態を表示することを特徴とする生体光計測装置。 - 前記照射用光ファイバ及び前記検出用光ファイバを検査する生体模擬試料を含む検査装置を備え、ゲイン比較部は、前記検査装置に前記照射用光ファイバ及び前記検出用光ファイバを挿入した際に得られた前記ゲイン値と前記断線ゲイン値と比較することを特徴とする請求項1記載の生体光計測装置。
- 前記ゲイン調整部の前記ゲイン値と前記断線ゲイン値は、前記光量を均一化するために定められたゲインであることを特徴とする請求項1記載の生体光計測装置。
- 前記ゲイン記憶部は、所定割合の光ファイバが断線している前記照射用光ファイバ若しくは前記検出用光ファイバを用いて断線ゲイン値を記憶することを特徴とする請求項1記載の生体光計測装置。
- 前記断線判定部は、前記ゲイン値が前記断線ゲイン値より高いか低いか否かを判定し、前記ゲイン値が前記断線ゲイン値より高い場合、前記照射用光ファイバ若しくは前記検出用光ファイバは断線していると判定することを特徴とする請求項1記載の生体光計測装置。
- 前記ゲイン値が前記断線ゲイン値より高い場合、前記表示部は、該断線している照射用光ファイバ若しくは検出用光ファイバの位置情報とともに警告情報を表示することを特徴とする請求項1記載の生体光計測装置。
- 前記ゲイン値が前記断線ゲイン値より高い場合、前記表示部は、前記ゲイン値が高い箇所にマークを表示することを特徴とする請求項1記載の生体光計測装置。
- 前記表示部は、周囲4箇所に前記マークが表示された前記照射用光ファイバ若しくは前記検出用光ファイバのナンバーを表示することを特徴とする請求項7記載の生体光計測装置。
- 前記ゲイン記憶部は、断線しそうな照射用光ファイバ若しくは検出用光ファイバを用いた際に前記ゲイン調整部で設定される注意ゲイン値をさらに記憶し、前記断線判定部は、前記ゲイン値が前記注意ゲイン値より高いか低いか否かを判定し、前記ゲイン値が前記注意ゲイン値より高い場合、前記照射用光ファイバ若しくは前記検出用光ファイバは断線しそうであると判定することを特徴とする請求項1記載の生体光計測装置。
- 前記ゲイン記憶部は経時的に取得された前記ゲイン値を記憶し、前記断線判定部は経時的に取得された前記ゲイン値の推移から前記断線ゲイン値を超える日を算出することを特徴とする請求項1記載の生体光計測装置。
- 前記ゲイン記憶部は経時的に取得された前記ゲイン値を記憶し、前記断線判定部は経時的に取得された前記ゲイン値の推移から前記注意ゲイン値を超える日を算出することを特徴とする請求項9記載の生体光計測装置。
- 前記断線判定部は、経時的に取得された前記ゲイン値の傾きが所定値以上であれば、前記表示部に注意表示を行なうことを特徴とする請求項1記載の生体光計測装置。
- 光計測で検出された計測データに通過光の光量に基づいてゲイン値を設定するステップと、断線された照射用光ファイバ若しくは検出用光ファイバを用いた際に設定される断線ゲイン値を記憶するステップと、前記ゲイン値と前記断線ゲイン値とを比較するステップと、前記ゲイン値と前記断線ゲイン値の比較結果により、照射用光ファイバ若しくは検出用光ファイバが断線しているか否かを判定するステップとを含む光ファイバの断線判定方法。
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EP10761663.3A EP2417909B1 (en) | 2009-04-08 | 2010-04-05 | Biophotometer and method for determining disconnection of optical fiber |
CN201080014091.4A CN102365049B (zh) | 2009-04-08 | 2010-04-05 | 生物体光计测装置和光纤的断线判定方法 |
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JP2020522323A (ja) * | 2017-06-07 | 2020-07-30 | オミクロン−レーザーエイジ レーザープロダクト ゲーエムベーハー | 医療装置の光源を較正する方法及び装置 |
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CN103610467B (zh) * | 2013-11-05 | 2016-08-03 | 李鲁亚 | 并行近红外光电传感装置及动物器官组织检测系统与方法 |
JP6443851B2 (ja) * | 2014-08-04 | 2018-12-26 | キヤノン株式会社 | 被検体情報取得装置、被検体情報取得方法およびプログラム |
AU2019307498A1 (en) | 2018-07-16 | 2021-02-04 | Bbi Medical Innovations, Llc | Perfusion and oxygenation measurement |
CN111466923A (zh) * | 2020-05-14 | 2020-07-31 | 中科搏锐(北京)科技有限公司 | 一种多通道组织血氧同步无创监测装置及其方法 |
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US8803070B2 (en) | 2014-08-12 |
JPWO2010116964A1 (ja) | 2012-10-18 |
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EP2417909A1 (en) | 2012-02-15 |
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