Medical-grade Sterilizable Target for Fluid-immersed Fetoscope Optical Distortion Calibration

Nikitichev, Daniil I.; Shakir, Dzhoshkun I.; Chadebecq, François; Tella, Marcel; Deprest, Jan; Stoyanov, Danail; Ourselin, Sébastien; Vercauteren, Tom

doi:10.3791/55298-v

Cited by 1 publication

(2 citation statements)

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“…The calibration pattern itself is a 132 mm × 97 mm dot grid pattern (Figure 2), fabricated on an aluminum plate using a Violino2 Laser Cutter 38 . This was chosen for manufacturing reasons, as the pattern can be more accurately laser etched than the alternative pattern considered, a ChArUco + Chessboard pattern, that is, a ChArUco pattern with an additional chessboard placed at its center.…”

Section: Methodsmentioning

confidence: 99%

“…The calibration pattern itself is a 132 mm × 97 mm dot grid pattern (Figure 2 ), fabricated on an aluminum plate using a Violino2 Laser Cutter. 38 This was chosen for manufacturing reasons, as the pattern can be more accurately laser etched than the alternative pattern considered, a ChArUco + Chessboard pattern, that is, a ChArUco pattern with an additional chessboard placed at its center. A standard chessboard pattern was purposefully excluded, as this requires the entire pattern to be visible for successful calibration, whereas the other patterns require only central elements to be visible, reducing potential errors and delays when operating in theater.…”

Section: Methodsmentioning

confidence: 99%

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Evaluation of a calibration rig for stereo laparoscopes

et al. 2023

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Background Accurate camera and hand‐eye calibration are essential to ensure high‐quality results in image‐guided surgery applications. The process must also be able to be undertaken by a nonexpert user in a surgical setting. Purpose This work seeks to identify a suitable method for tracked stereo laparoscope calibration within theater. Methods A custom calibration rig, to enable rapid calibration in a surgical setting, was designed. The rig was compared against freehand calibration. Stereo reprojection, stereo reconstruction, tracked stereo reprojection, and tracked stereo reconstruction error metrics were used to evaluate calibration quality. Results Use of the calibration rig reduced mean errors: reprojection (1.47 mm [SD 0.13] vs. 3.14 mm [SD 2.11], p‐value 1e−8), reconstruction (1.37 px [SD 0.10] vs. 10.10 px [SD 4.54], p‐value 6e−7), and tracked reconstruction (1.38 mm [SD 0.10] vs. 12.64 mm [SD 4.34], p‐value 1e−6) compared with freehand calibration. The use of a ChArUco pattern yielded slightly lower reprojection errors, while a dot grid produced lower reconstruction errors and was more robust under strong global illumination. Conclusion The use of the calibration rig results in a statistically significant decrease in calibration error metrics, versus freehand calibration, and represents the preferred approach for use in the operating theater.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%