Results 281 to 290 of about 140,209 (335)

Continuum Mechanics Modeling of Flexible Spring Joints in Surgical Robots

Advanced Robotics Research, EarlyView.
A new mechanical model of a tendon‐actuated helical extension spring joint in surgical robots is built using Cosserat rod theory. The model can implicitly handle the unknown contacts between adjacent coils and numerically predict spring shapes from straight to significantly bent under actuation forces.
Botian Sun, Liang Zhang, Jianwen Zeng, Xuefeng Wang   +3 more
wiley   +1 more source

Tumbling Magnetic Microrobots for Targeted In Vivo Drug Delivery in the GI Tract

Advanced Robotics Research, EarlyView.
We introduce a microrobot design and integrated system for on‐demand targeted drug release in the gastrointestinal tract. The microrobot has an embedded magnet for actuation with external magnetic fields and is visualized in real time using ultrasound. It has two drug release ports sealed with a thermally sensitive wax. Local heating of the wax using a
Aaron C. Davis, Luis Carlos Sanjuan Acosta, Shubh P. Mehta, Baiyan Qi, Yang Yang, Luis Solorio, Craig J. Goergen, David J. Cappelleri   +7 more
wiley   +1 more source

Waveguide Photoactuators: Materials, Fabrication, and Applications

Advanced Robotics Research, EarlyView.
Waveguide photoactuators convert guided light into mechanical motion. Their tethered‐flexible design enables minimally invasive surgery and confined‐space robotics. This review aims to guide materials selection, device design, and system integration, accelerating the transition of waveguide photoactuators from laboratory prototypes to versatile ...
Minjie Xi, Hemin Pan, Yang Zong, Yongfeng Mei, Jizhai Cui   +4 more
wiley   +1 more source

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Spiral computed tomography for pulmonary embolism

Hospital Medicine, 2000
Spiral computed tomography pulmonary angiography is increasingly used in the non-invasive investigation of patients with suspected pulmonary embolism. This review will focus on current techniques and indications with an explanation of the computed tomography signs of pulmonary embolism, possible pitfalls in interpretation and limitations of the ...
S J, Howling, D M, Hansell
openaire   +2 more sources

Spiral computed tomography for biliary dilatation

Journal of Pediatric Surgery, 1995
Spiral computed tomography (SCT), which consists of rapid volumetric data acquisition and planar image display, was performed on 12 patients with biliary dilatation after excisional procedure. The technique was evaluated for image quality and impact on clinical practice. All patients safely underwent SCT scanning after intravenous cholangiography (IVC)
Y, Hamada, M, Sato, T, Sanada, M, Tsuji, M, Kogata, K, Hioki   +5 more
openaire   +2 more sources

Spiral computed tomography for staghorn calculi

Urology, 1997
To assess the utility of spiral computed tomography (CT) with three-dimensional reconstruction for preoperative planning of percutaneous nephrostolithotomy in patients with complex branched calculi (full staghorns).Patients with complex branched stones were imaged with spiral CT with three-dimensional reconstruction.
S N, Liberman, E J, Halpern, K, Sullivan, D H, Bagley   +3 more
openaire   +2 more sources

Optimal pitch in spiral computed tomography

Medical Physics, 1997
The focus of this paper is to analytically optimize spiral/helical computed tomography (CT) protocols based on a simplified imaging model. Spiral CT was approximately modeled as follows: Using the half‐scan raw data interpolation method, the variance of the spiral CT slice sensitivity profile is equal to the sum of squared detector collimation divided ...
G, Wang, M W, Vannier
openaire   +2 more sources

Enhancing computational holography with spiral phase coding

Optics Letters, 2023
In this Letter, we propose a new, to the best of our knowledge, approach to generate computer-generated holograms (CGHs) utilizing spiral phase coding. This method can be applied to generate an array spiral phase plate that can generate array vortex spots with a high compression ratio. Moreover, the method extends its applicability to the generation of
Yuyuan Tian, Linwei Zhu, Meiyu Sun
openaire   +2 more sources

Spiral Computed Tomography

2017
X-ray computed tomography (CT) is a medical imaging method, where the patient is placed on the CT table and an x-ray tube rotates around the body and sends x-rays through the body. Those x-rays experience a varying attenuation along their way depending on the body part they are transversing.
Erich Sorantin, Sabine Weissensteiner
openaire   +1 more source

Spiral computed tomography for bilioenteric anastomotic stricture

Pediatric Surgery International, 1998
Spiral computed tomography scanning after intravenous cholangiography (IVC-SCT) was used to assess the anatomy of the biliary tree and anastomosis in a 7-year-old girl with recurrent cholangitis 5 years after surgical excision of a choledochal cyst.
Y, Hamada, M, Sato, K, Takada, K, Hioki
openaire   +2 more sources