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EP-4734812-A1 - TESTING DEVICE, SYSTEM, AND TESTING METHOD

EP4734812A1EP 4734812 A1EP4734812 A1EP 4734812A1EP-4734812-A1

Abstract

The present invention relates to a testing device (10) comprising: a light supply (12), which is designed to guide a first illumination light; a conversion element (14), which is designed to convert light from the first illumination light having a first wavelength (16) at least partially into second illumination light having a second wavelength (18) different from the first wavelength (16); and an optical target (20), which is arranged such that first illumination light and second illumination light can be supplied thereto for lighting the target (20) in order to detect a calibration image (22) of the optical target (20).

Inventors

  • Baumann, Christin
  • Hedemann, Lars

Assignees

  • Karl Storz SE & Co. KG

Dates

Publication Date
20260506
Application Date
20240625

Claims (20)

  1. 1. Test device (10), comprising: a light feed (12) which is designed to guide first illumination light; a conversion element (14) which is designed to at least partially convert light of the first illumination light with a first wavelength (16) into second illumination light with a second wavelength (18) different from the first wavelength (16); and an optical target (20) which is arranged such that first illumination light and second illumination light can be fed to it for illuminating the target (20) for capturing a calibration image (22) of the optical target (20).
  2. 2. Test device (10) according to claim 1, wherein the second wavelength (18) comprises a wavelength from the infrared range, in particular from the near-infrared range.
  3. 3. Test device (10) according to claim 1 or 2, wherein the first illumination light at least predominantly comprises light from the visible range.
  4. 4. Test device (10) according to one of the preceding claims, wherein the conversion element (14) is designed to convert light from the visible range at least partially into light from the infrared range.
  5. 5. Test device (10) according to one of the preceding claims, wherein the conversion element (14) has luminescent properties, wherein the conversion element (14) is designed to convert, by means of the luminescent properties, light of the first illumination light with the first wavelength (16) at least partially into the second illumination light with the second wavelength (18) different from the first wavelength (16).
  6. 6. Test device (10) according to one of the preceding claims, further comprising a holder (24), wherein the holder (24) is intended to make the test device (10) coupleable to a medical imaging device (26) to be tested.
  7. 7. The test device (10) of claim 6, wherein the holder (24) comprises a spacer (28) defining a distance (30) between the medical imaging device (26) to be tested and the target (20).
  8. 8. Test device (10) according to claim 7, wherein the holder (24) is adapted to support the dead weight of the test device (10) in a state coupled to the medical imaging device (26) to be tested.
  9. 9. Test device (10) according to claim 7 or 8, wherein the holder (24) comprises a coupling portion (32) for coupling to the medical imaging device (26) to be tested, wherein the coupling portion (32) comprises a projection (34) which is adapted to hold the test device (10) by engaging behind it.
  10. 10. Test device (10) according to claim 9, wherein the coupling portion (32) further comprises a movable holding element (36) which is configured to selectively fix the holder (24) to the medical imaging device (26) to be tested.
  11. 11. Test device (10) according to one of the preceding claims, wherein the light feed (12) comprises a reflective screen (38) which is designed to guide the illumination light to the conversion element (14), wherein the screen (38) has a cross-sectional area (40) which increases in the direction of the conversion element (14).
  12. 12. Test device (10) according to one of the preceding claims, further comprising a light guide connection (42) to which a light guide (44) can be connected such that first illumination light guided in the light guide (44) can be coupled into the test device (10).
  13. 13. Test device (10) according to one of claims 11 or 12, wherein the optical fiber connection (42) is arranged at a proximal end (46) of the reflective screen (38) having a first cross-sectional area (48), and wherein the conversion element (14) is arranged at a distal end (49) of the reflective screen (38) having a second cross-sectional area (50), wherein the second cross-sectional area (50) is larger than the first cross-sectional area (48).
  14. 14. Test device (10) according to one of the preceding claims, wherein the light supply (12) comprises a diffusion element (52) which is configured to scatter and homogenize light of the first illumination light.
  15. 15. Test device (10) according to one of the preceding claims, wherein the optical target (20) is movably mounted.
  16. 16. Test device (10) according to one of the preceding claims, wherein the optical target (20) comprises at least one calibration pattern (54), and wherein the calibration pattern (54) can be imaged on the calibration image (22).
  17. 17. Test device (10) according to claim 16, wherein the calibration pattern (54) comprises at least one line (56) and/or a cross (58).
  18. 18. Test device (10) according to claim 16 or 17, wherein the calibration pattern comprises a central rectangular cross (59) with elongated arms (60), the center of which can be arranged in the center of the calibration image (22), and which divides the calibration image (22) into four quadrants (62), wherein in each of the four quadrants (62) there is arranged a further rectangular cross (58) with elongated arms (60), the center of which is arranged in a central region of the corresponding quadrant (62).
  19. 19. Test device (10) according to one of the preceding claims, wherein the optical target (20) is integrated with the conversion element (14).
  20. 20. System (100) comprising a test device (10) according to one of the preceding claims; and a medical imaging device (26) with an image capture unit (64), wherein the image capture unit (64) comprises: a first image capture device (66) which is light-sensitive in a first spectral range (70) which includes the first wavelength (16); and a second image capture device (68) which is light-sensitive in a second spectral range (72) which is different from the first spectral range (70) and which includes the second wavelength (18); wherein the image capture unit (64) has a geometric calibration of the first image capture device (66) and the second image capture device (68) with respect to their imaging ranges; wherein the image capture unit (64) is configured to record calibration images (22) of an optical target (20), and wherein the geometric calibration of the image capture unit (64) can be checked using the calibration images (22).

Description

test device, system and test procedure The present application relates to a test device, a system and a test method. In medical imaging, exoscopes are state-of-the-art technology that can be used to create spatial (magnified) representations of an area under examination. For example, such exoscopes can be used to visualize microsurgical and/or open interventions to support a surgeon. The spatial representation allows the surgeon to assess and/or follow his own actions more intuitively via a screen. In order to be able to generate the spatial representation, such exoscopes have at least two image capture devices, each of which takes an image of the examination area. The image capture devices must have the most precise geometric calibration possible, which can mean in particular that they are aligned relative to one another in such a way that images can be captured in a common coordinate system. Otherwise, the spatial representation would be generated with errors and viewing the representation, especially over a longer period of time, would lead to greater cognitive strain on the surgeon and could even lead to headaches or other physical impairments. Furthermore, the exoscopes can have image capture devices which are at least additionally set up to capture images in a wavelength range that is different from the wavelength range of visible light. For example, the different wavelength range can be in the near infrared range and by means of this Image capture devices can be used to perform luminescence imaging, such as fluorescence imaging. Images based on luminescence imaging can be superimposed on other images to provide the surgeon with additional information about the area under examination. It is therefore necessary that these image capture devices are also coordinated with the other image capture devices, i.e. that they have a common geometric calibration with them. Typically, geometric calibration is performed at the factory and an exoscope is delivered to a customer in a calibrated state. The factory calibration is checked before delivery. Bulky test equipment is used for the check. These test devices must have various lighting devices and/or light sources, each of which provides light in the wavelength range in which the image capture devices operate. For example, it is common for the test devices to have a (near) infrared light source and a white light source. Based on the state of the art, the invention is based on the task of checking the geometric calibration simply and flexibly. This object is achieved according to the invention by a testing device, a system and a testing method as described herein and defined in the claims. The present invention can provide a testing device comprising a light feed which is configured to guide first illumination light, a conversion element which is configured to at least partially convert light of the first illumination light with a first wavelength into second illumination light with a second wavelength different from the first wavelength, and an optical target which is arranged such that first illumination light and second illumination light can be fed to it for illuminating the target for capturing a calibration image of the optical target. Furthermore, it can be provided to provide a system comprising a test device and a medical imaging device with an image capture unit. The image capture unit can comprise a first image capture device that is light-sensitive in a first spectral range that includes the first wavelength, and a second image capture device that is light-sensitive in a second spectral range that is different from the first spectral range and includes the second wavelength. In this case, the image capture unit can have a geometric calibration of the first image capture device and the second image capture device with respect to their imaging areas and the image capture unit can be set up to record calibration images of the optical target. Furthermore The geometric calibration of the image acquisition unit can be verified using the calibration images. Furthermore, it can be provided to provide a test method. The test method can comprise the steps of generating first illumination light, which comprises light with a first wavelength, generating second illumination light, which comprises light with a second wavelength different from the first wavelength, supplying the first illumination light and the second illumination light to an optical target for illuminating it, recording calibration images of the target by means of a medical imaging device with an image capture unit, wherein the image capture unit comprises a first image capture device which is light-sensitive in a first spectral range, and a second image capture device which is light-sensitive in a second spectral range different from the first spectral range, which comprises the second wavelength, wherein the image capture unit has a geometric calibration of the first image capture device and th