A micromachined water-immersible scanning mirror using BoPET hinges

Freehand scanning photoacoustic microscopy with simultaneous localization and mapping

“…The feature points are used to determine an “affine” transformation matrix, which can transfer the two images to the same coordinates. Repeating this operation, we can stitch multiple partially overlapped images [35] , [36] , [37] , [38] , [39] into a large image. The field of view of the stitched image is determined by the freehand-scanning, rather than one C-scan, and thus can be greatly enlarged.…”

Review of Three-Dimensional Handheld Photoacoustic and Ultrasound Imaging Systems and Their Applications

“…Taking advantage of the system's high scanning speed (C-scan rate, 5-10 Hz), they applied simultaneous localization and mapping called SLAM. The SLAM performed feature point extraction between consecutive scan images using the speeded-up robust features (SURF) method and scale-invariant feature transform (SIFT) method [86][87][88][89]. Points were then used to calibrate positions of consecutive images.…”

Micromachined two-axis water-immersible scanning mirror using torsional and bending hinges

“…The scanning mirror was held by a clamp at 45 deg facing The ultrasound image reconstruction followed a similar process previously reported. 12 The 24,720 scan points were arranged together to form a 3D data matrix. At each scan point, the transducer sent an ultrasound pulse and received the backscattered "A-line" echo signal.…”