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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
reconstruct...
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...
Real-time wireless tumor tracking during breast conserving surgery
Springer Science and Business Media LLC - Tập 13 - Trang 531-539 - 2017
To evaluate a novel surgical navigation system for breast conserving surgery
(BCS), based on real-time tumor tracking using the Calypso $$\circledR $$ 4D
Localization System (Varian Medical Systems Inc., USA). Navigation-guided breast
conserving surgery (Nav-BCS) was compared to conventional iodine seed-guided BCS
( $$^{125}$$ I-BCS). Two breast phantom types were produced, containing
spherical an...
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 ...
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