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A variable baseline stereoscopic camera with fast deployable structure for natural orifice transluminal endoscopic surgery
Springer Science and Business Media LLC - Tập 17 - Trang 27-39 - 2021
Stereo vision can provide surgeons with 3D images and reduce the difficulty of operation in robot-assisted surgery. In natural orifice transluminal endoscopic surgery, distortions of the stereoscopic images could be induced at different observation depths. This would increase the risk of surgery. We proposed a novel camera to solve this problem. This study integrated the camera calibration matrix ......
PET/CT-guided biopsy with respiratory motion correction
Springer Science and Business Media LLC - Tập 14 - Trang 2187-2198 - 2019
Given the ability of positron emission tomography (PET) imaging to localize malignancies in heterogeneous tumors and tumors that lack an X-ray computed tomography (CT) correlate, combined PET/CT-guided biopsy may improve the diagnostic yield of biopsies. However, PET and CT images are naturally susceptible to problems due to respiratory motion, leading to imprecise tumor localization and shape dis......
Factors related to disagreement in implant size between preoperative CT-based planning and the actual implants used intraoperatively for total hip arthroplasty
Springer Science and Business Media LLC - Tập 13 - Trang 551-562 - 2017
In total hip arthroplasty, prediction of the optimal implant size is important in order to prevent perioperative complications. However, it is not easy to achieve complete agreement between the planned size and the actual size required appropriate implant fit. No previous report has adequately discussed the factors related to mismatch between predicted and actual implant sizes. The purpose was to ......
The colonoscopic vacuum model–simulating biomechanical restrictions to provide a realistic colonoscopy training environment
Springer Science and Business Media LLC - Tập 18 - Trang 105-116 - 2022
Practicing endoscopic procedures is fundamental for the education of clinicians and the benefit of patients. Despite a diverse variety of model types, there is no system simulating anatomical restrictions and variations in a flexible and atraumatic way. Our goal was to develop and validate a new modelling approach for adhesion forces between colon and abdominal wall. An inlay for a standard mechan......
Comparison of methods for sensitivity correction in Talbot–Lau computed tomography
Springer Science and Business Media LLC - Tập 16 - Trang 2099-2106 - 2021
In Talbot–Lau X-ray phase contrast imaging, the measured phase value depends on the position of the object in the measurement setup. When imaging large objects, this may lead to inhomogeneous phase contributions within the object. These inhomogeneities introduce artifacts in tomographic reconstructions of the object.
In this work, we compare recently proposed approaches to correct such reconstru......
Automatic CT image segmentation of maxillary sinus based on VGG network and improved V-Net
Springer Science and Business Media LLC - Tập 15 - Trang 1457-1465 - 2020
The analysis of the maxillary sinus (MS) can provide an assessment for many clinical diagnoses, so accurate CT image segmentation of the MS is essential. However, common segmentation methods are mainly done by experienced doctors manually, and there are some challenges such as low efficiency and precision. As for automatic methods, the initial seed points and adjustment of various parameters are r......
Positioning error evaluation of GPU-based 3D ultrasound surgical navigation system for moving targets by using optical tracking system
Springer Science and Business Media LLC - Tập 8 - Trang 379-393 - 2012
A near real-time three-dimensional (3D) ultrasound navigation system has been developed for guiding surgery involving internal organs that move and change shape (e.g., abdominal surgery, fetal surgery). In practical applications, significant errors arise between the actual navigation-image positions depending on the time delay of the system. Therefore, the positioning error of the system relative ......
Myocardium tracking via matching distributions
Springer Science and Business Media LLC - Tập 4 Số 1 - Trang 37-44 - 2009
A method to analyze the evolution of malignant gliomas using MRI
Springer Science and Business Media LLC - Tập 3 - Trang 571-579 - 2008
To introduce a novel approach for the monitoring of glioma evolution by the extraction of mathematical parameters from follow-up MRI. The method consists of the registration of follow-up MR images and the analysis of the deformation field. The registration was performed through an affine transformation followed by a non-rigid registration using free-form deformations (FFDs). A subsequent analysis ......
Paced-curriculum distillation with prediction and label uncertainty for image segmentation
Springer Science and Business Media LLC - Tập 18 - Trang 1875-1883 - 2023
In curriculum learning, the idea is to train on easier samples first and gradually increase the difficulty, while in self-paced learning, a pacing function defines the speed to adapt the training progress. While both methods heavily rely on the ability to score the difficulty of data samples, an optimal scoring function is still under exploration. Distillation is a knowledge transfer approach wher......
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