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Your search keyword '"Cheung, Chim‐Lee"' showing total 10 results
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10 results on '"Cheung, Chim‐Lee"'

1. Interactive Multi‐Stage Robotic Positioner for Intra‐Operative MRI‐Guided Stereotactic Neurosurgery

Author

He, Zhuoliang, primary, Dai, Jing, additional, Ho, Justin Di‐Lang, additional, Tong, Hon‐Sing, additional, Wang, Xiaomei, additional, Fang, Ge, additional, Liang, Liyuan, additional, Cheung, Chim‐Lee, additional, Guo, Ziyan, additional, Chang, Hing‐Chiu, additional, Iordachita, Iulian, additional, Taylor, Russell H., additional, Poon, Wai‐Sang, additional, Chan, Danny Tat‐Ming, additional, and Kwok, Ka‐Wai, additional

Published
2023
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2. Interactive Multi‐Stage Robotic Positioner for Intra‐Operative MRI‐Guided Stereotactic Neurosurgery.

Author

He, Zhuoliang, Dai, Jing, Ho, Justin Di‐Lang, Tong, Hon‐Sing, Wang, Xiaomei, Fang, Ge, Liang, Liyuan, Cheung, Chim‐Lee, Guo, Ziyan, Chang, Hing‐Chiu, Iordachita, Iulian, Taylor, Russell H., Poon, Wai‐Sang, Chan, Danny Tat‐Ming, and Kwok, Ka‐Wai

Subjects
STEREOTAXIC techniques, SOFT robotics, ROBOTICS, NEUROSURGERY, MAGNETIC resonance imaging, IMAGE registration
Abstract

Magnetic resonance imaging (MRI) demonstrates clear advantages over other imaging modalities in neurosurgery with its ability to delineate critical neurovascular structures and cancerous tissue in high‐resolution 3D anatomical roadmaps. However, its application has been limited to interventions performed based on static pre/post‐operative imaging, where errors accrue from stereotactic frame setup, image registration, and brain shift. To leverage the powerful intra‐operative functions of MRI, e.g., instrument tracking, monitoring of physiological changes and tissue temperature in MRI‐guided bilateral stereotactic neurosurgery, a multi‐stage robotic positioner is proposed. The system positions cannula/needle instruments using a lightweight (203 g) and compact (Ø97 × 81 mm) skull‐mounted structure that fits within most standard imaging head coils. With optimized design in soft robotics, the system operates in two stages: i) manual coarse adjustment performed interactively by the surgeon (workspace of ±30°), ii) automatic fine adjustment with precise (<0.2° orientation error), responsive (1.4 Hz bandwidth), and high‐resolution (0.058°) soft robotic positioning. Orientation locking provides sufficient transmission stiffness (4.07 N/mm) for instrument advancement. The system's clinical workflow and accuracy is validated with lab‐based (<0.8 mm) and MRI‐based testing on skull phantoms (<1.7 mm) and a cadaver subject (<2.2 mm). Custom‐made wireless omni‐directional tracking markers facilitated robot registration under MRI. [ABSTRACT FROM AUTHOR]

Published
2024
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3. Omnidirectional Monolithic Marker for Intra-Operative MR-Based Positional Sensing in Closed MRI

Author

Cheung, Chim-Lee, Wu, Mengjie, Fang, Ge, Ho, Justin D. L., Liang, Liyuan, Tan, Kel Vin, Lin, Fa-Hsuan, Chang, Hing-Chiu, and Kwok, Ka-Wai

Abstract

We present a design of an inductively coupled radio frequency (ICRF) marker for magnetic resonance (MR)-based positional tracking, enabling the robust increase of tracking signal at all scanning orientations in quadrature-excited closed MR imaging (MRI). The marker employs three curved resonant circuits fully covering a cylindrical surface that encloses the signal source. Each resonant circuit is a planar spiral inductor with parallel plate capacitors fabricated monolithically on flexible printed circuit board (FPC) and bent to achieve the curved structure. Size of the constructed marker is Ø3-mm $\times5$ -mm with quality factor > 22, and its tracking performance was validated with 1.5 T MRI scanner. As result, the marker remains as a high positive contrast spot under 360° rotations in 3 axes. The marker can be accurately localized with a maximum error of 0.56 mm under a displacement of 56 mm from the isocenter, along with an inherent standard deviation of 0.1-mm. Accrediting to the high image contrast, the presented marker enables automatic and real-time tracking in 3D without dependency on its orientation with respect to the MRI scanner receive coil. In combination with its small form-factor, the presented marker would facilitate robust and wireless MR-based tracking for intervention and clinical diagnosis. This method targets applications that can involve rotational changes in all axes (X-Y-Z).

Published
2024
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5. Shape Tracking and Feedback Control of Cardiac Catheter Using MRI-Guided Robotic Platform—Validation With Pulmonary Vein Isolation Simulator in MRI

Author

Dong, Ziyang, primary, Wang, Xiaomei, additional, Fang, Ge, additional, He, Zhuoliang, additional, Ho, Justin Di-Lang, additional, Cheung, Chim-Lee, additional, Tang, Wai Lun, additional, Xie, Xiaochen, additional, Liang, Liyuan, additional, Chang, Hing-Chiu, additional, Ching, Chi Keong, additional, and Kwok, Ka-Wai, additional

Published
2022
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