journal
MENU ▼
Read by QxMD icon Read
search

Computer Assisted Surgery (Abingdon, England)

journal
https://read.qxmd.com/read/30822159/super-resolution-reconstruction-for-medical-image-based-on-adaptive-multi-dictionary-learning-and-structural-self-similarity
#1
Fang Zhang, Yue Wu, Zhitao Xiao, Lei Geng, Jun Wu, Jia Wen, Wen Wang, Ping Liu
To improve the quality of the super-resolution (SR) reconstructed medical images, an improved adaptive multi-dictionary learning method is proposed, which uses the combined information of medical image itself and the natural images database. In training dictionary section, it uses the upper layer images of pyramid which are generated by the self-similarity of low resolution images. In reconstruction section, the top layer image of pyramid is taken as the initial reconstruction image, and medical image's SR reconstruction is achieved by regularization term which is the non-local structure self-similarity of the image...
March 1, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30821536/first-spine-surgery-utilizing-real-time-image-guided-robotic-assistance
#2
A Karim Ahmed, Corinna C Zygourakis, Samuel Kalb, Alex M Zhu, Camilo A Molina, Bowen Jiang, Ari M Blitz, Ali Bydon, Neil R Crawford, Nicholas Theodore
Robotics in spinal surgery has significant potential benefits for both surgeons and patients, including reduced surgeon fatigue, improved screw accuracy, decreased radiation exposure, greater options for minimally invasive surgery, and less time required to train residents on techniques that can have steep learning curves. However, previous robotic systems have several drawbacks, which are addressed by the innovative ExcelsiusGPSTM robotic system. The robot is secured to the operating room floor, not the patient...
March 1, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30760103/synchronization-control-of-pulsatile-ventricular-assist-devices-by-combination-usage-of-different-physiological-signals
#3
Xinghui Li, Lunchao Zhong, Lin Luo, Shidong Zhu, Kai Ni, Qian Zhou, Bibo Yang, Xiaohao Wang
Three different types of synchronous control methods based on physiological parameters, electrocardiogram (ECG) and fixed systole, ECG and aortic pressure, and ECG and phonocardiogram (PCG) were used to trigger a proposed intra-ventricular assist device (iVAD). The ECG, aortic pressure, and PCG were processed, respectively, and featured characteristics were extracted to trigger the iVAD-experimented in vitro circulation system in the laboratory. The data showed that all three types of synchronous control methods produced trigger pulses synchronously and that the iVAD synchronously beat with the native heart...
February 14, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30760050/real-time-tracking-of-surgical-instruments-based-on-spatio-temporal-context-and-deep-learning
#4
Zijian Zhao, Zhaorui Chen, Sandrine Voros, Xiaolin Cheng
ABSTARCT Real-time tool tracking in minimally invasive-surgery (MIS) has numerous applications for computer-assisted interventions (CAIs). Visual tracking approaches are a promising solution to real-time surgical tool tracking, however, many approaches may fail to complete tracking when the tracker suffers from issues such as motion blur, adverse lighting, specular reflections, shadows, and occlusions. We propose an automatic real-time method for two-dimensional tool detection and tracking based on a spatial transformer network (STN) and spatio-temporal context (STC)...
February 14, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30741034/in-vitro-testing-of-an-intra-ventricular-assist-device
#5
Shidong Zhu, Lin Luo, Bibo Yang, Xinghui Li, Kai Ni, Qian Zhou, Xiaohao Wang
A novel pulsatile assist device, intra-ventricular assist device, was proposed to address various disadvantages existing in conventional pulsatile assist device, such as the large size, accessories and reduced pulsatility. The assist device was designed, fabricated and implanted into the sac from left ventricular apex in a home-designed mock circulatory system. In vitro test was carried out and results demonstrated that the response time did not vary with the heart rate, and co-pulsatiled synchronously with native heart by electrocardiograph...
February 11, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30741020/a-non-contact-interactive-stereo-display-system-for-exploring-human-anatomy
#6
Ziteng Liu, Wenpeng Gao, Yu Sun, Yixian Su, Jiahua Zhu, Lubing Xu, Yili Fu
Stereoscopic display based on Virtual Reality (VR) can facilitate clinicians observing 3 D anatomical models with the depth cue which lets them understand the spatial relationship between different anatomical structures intuitively. However, there are few input devices available in the sterile field of the operating room for controlling 3 D anatomical models. This paper presents a cost-effective VR application for stereo display of 3 D anatomical models with non-contact interaction. The system is integrated with hand gesture interaction and voice interaction to achieve non-contact interaction...
February 11, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30712394/a-targeting-method-for-robot-assisted-percutaneous-needle-placement-under-fluoroscopy-guidance
#7
Zhonghao Han, Keyi Yu, Lei Hu, Weishi Li, Huilin Yang, Minfeng Gan, Na Guo, Biao Yang, Hongsheng Liu, Yuhan Wang
BACKGROUND: Minimally invasive procedures are rapidly growing in popularity thanks to advancements in medical robots, visual navigation and space registration techniques. This paper presents a precise and efficient targeting method for robot-assisted percutaneous needle placement under C-arm fluoroscopy. METHOD: A special end-effector was constructed to perform fluoroscopy calibration and robot to image-space registration simultaneously and automatically. In addition, formulations were given to compute the movement of robot targeting and evaluate targeting accuracy using only one X-ray image...
February 2, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30691307/minimally-invasive-surgical-techniques-for-the-therapy-of-far-lateral-disc-herniation-in-middle-aged-and-elderly-patients
#8
Weijian Ren, Yu Chen, Liangbi Xiang
To examine the clinical results of different minimally invasive techniques for the therapy of far lateral disc herniation in middle-aged and elderly patients. Percutaneous endoscopic lumbar discectomy, MIS-TLIF combined with contralateral translaminar screw and MIS-TLIF combined with bilateral pedicle screws were evaluated via a retrospective chart review. Data from 74 consecutive middle-aged and elderly patients with far lateral disc herniation were analyzed. All patients underwent surgery; 19 with PELD, 24 with MIS-TLIF CTS, and 31 with MIS-TLIF BPS...
January 29, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30689449/the-role-of-the-precuneus-and-posterior-cingulate-cortex-in-the-neural-routes-to-action
#9
Zijian Wang, Fei Liu, Yaoru Sun, Jie Li, Fang Wang, Zheng Lu
Neural substrates of action to the object or this specific direct route, however, remain unclear, especially for the connection from the visual pathway to the motor cortex. The study examined this issue by conducting an fMRI experiment, in which two action generation tasks involving pictures of real objects (PA) and the object's nouns (NA) were used, with pictures naming (PN) and covert noun reading (NR) being the control tasks. The result showed that the model predefined for the PCC and precuneus connecting IPL to the posterior-medial frontal cortex dominated over the others (with 0...
January 28, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30689446/a-novel-technique-for-analysing-histogram-equalized-medical-images-using-superpixels
#10
Li Yao, Sohail Muhammad
We present a novel technique to distinguish between an original image and its histogram equalized version. Histogram equalization and superpixel segmentation such as SLIC (simple linear iterative clustering) are very popular image processing tools. Based on these two concepts, we introduce a method for finding whether an image (grayscale) is histogram equalized or not. Because sometimes we see images that look visually similar but they are actually processed or changed by some image enhancement process such as histogram equalization...
January 28, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30689445/a-targeting-method-for-robot-assisted-percutaneous-needle-placement-under-fluoroscopy-guidance
#11
Zhonghao Han, Keyi Yu, Lei Hu, Weishi Li, Huilin Yang, Minfeng Gan, Na Guo, Biao Yang, Hongsheng Liu, Yuhan Wang
Minimally invasive procedures are rapidly growing in popularity thanks to advancements in medical robots, visual navigation and space registration techniques. This paper presents a precise and efficient targeting method for robot-assisted percutaneous needle placement under C-arm fluoroscopy. In this method, a special end-effector was constructed to perform fluoroscopy calibration and robot to image-space registration simultaneously. In addition, formulations were given to compute the movement of robot targeting and evaluate targeting accuracy using only one X-ray image...
January 28, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30689444/a-simple-geometric-method-for-3d-morphology-reconstruction-of-a-cell-based-on-two-orthogonal-phase-images
#12
Yawei Wang, Hao Han, Lei Wang, Jingrong Liao, Bing Xie, Ying Ji, Yuanyuan Xu
Fast 3D imaging and measurement of cells are of great importance in many fields associated with the life science. In this paper, only using two phase images in orthogonal directions, a geometric rotation method for 3D fast morphology reconstruction is proposed in view of more spheroid cells in blood cells. In this method, at first, the edges of a cell in two orthogonal projection directions are extracted from the corresponding phase images, and theirs centers and axes are determined. Then, with the geometric rotation method, the 3D surfaces of the cell membrane and its nuclei are reconstructed respectively...
January 28, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30689443/a-sensorless-force-feedback-system-for-robot-assisted-laparoscopic-surgery
#13
Baoliang Zhao, Carl A Nelson
The existing surgical robots for laparoscopic surgery offer no or limited force feedback, and there are many problems for the traditional sensor-based solutions. This paper builds a teleoperation surgical system and validates the effectiveness of sensorless force feedback. The tool-tissue interaction force at the surgical grasper tip is estimated using the driving motor's current, and fed back to the master robot with a position-force bilateral control algorithm. The stiffness differentiation experiment and tumor detection experiment were conducted...
January 28, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30689442/spinal-biomechanics-modeling-and-finite-element-analysis-of-surgical-instrument-interaction
#14
Weixing Guan, Yu Sun, Xiaozhi Qi, Ying Hu, Chunguang Duan, Huiren Tao, Xiaojun Yang
When the spinal surgery robot assists the surgeon perform the surgery, the patient is prone on the operating table. However, due to the force of the surgical instruments on the spine, there is a corresponding deformation in the surgical field, which affects the accuracy of the operation. In order to improve the accuracy and safety of the operation, this paper reconstructs the three-dimensional model of the lumbar spine which includes the vertebral body and the intervertebral disc based on the CT scan data, and then the lumbar spine is analyzed by the finite element method...
January 28, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30689441/multi-feature-fusion-method-for-medical-image-retrieval-using-wavelet-and-bag-of-features
#15
Liu Shuang, Chen Deyun, Chen Zhifeng, Pang Ming
Color, texture, and shape are the common features used for the retrieval systems. However, many medical images have a spot of color information. Therefore, the discriminative texture and shape features should be extracted to obtain a satisfied retrieval result. In order to increase the credibility of the retrieval process, many features can be combined to be used for medical image retrieval. Meanwhile, more features require more processing time, which will decrease the retrieval speed. In this paper, wavelet decomposition is adopted to generate different resolution images...
January 28, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30689436/experimental-study-on-the-detection-of-cerebral-hemorrhage-in-rabbits-based-on-broadband-antenna-technology
#16
Haisheng Zhang, Mingsheng Chen, Gui Jin, Jia Xu, Mingxin Qin
Hematoma enlargement often occurs in patients with spontaneous intracerebral hemorrhage (ICH), so it is necessary to monitor the amount of intracranial hemorrhage in patients after admission. At present, the commonly used intracranial pressure (ICP) method has the disadvantages of trauma and infection, and the Computer Tomography (CT) method cannot achieve continuous monitoring. So it is urgent to develop a non-contact and non-invasive method for continuous monitoring of cerebral hemorrhage. The dielectric properties of blood are different from those of brain tissue, so the hematoma will affect the amplitude and phase of the electromagnetic waves passing through the head...
January 28, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30689434/a-new-modified-wavelet-based-ecg-denoising
#17
Zhaoyang Wang, Junjiang Zhu, Tianhong Yan, Lulu Yang
PURPOSE: Wavelet denoising is one of the denoising methods commonly used for ECG signals. However, due to the frequency overlap between the EMG and ECG, the feeble characteristics of ECG signals exists the risk of being weakened in the process of filtering noise. This paper presents a method of modified wavelet design and applies it to the denoising of ECG signals. MATERIALS AND METHODS: The optimized filter coefficients are obtained by approximating the amplitude-frequency response of the ideal filter, and the wavelet is constructed with the optimized filter coefficients...
January 28, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30689433/influence-of-extracerebral-layers-on-estimates-of-optical-properties-with-continuous-wave-near-infrared-spectroscopy-analysis-based-on-multi-layered-brain-tissue-architecture-and-monte-carlo-simulation
#18
Yan Zhang, Xin Liu, Qisong Wang, Dan Liu, Chunling Yang, Jinwei Sun, Peter Rolfe
Continuous wave near-infrared spectroscopy (CW-NIRS) can be used to measure cerebral activity because it is noninvasive, simple and portable. However, the performance of the CW-NIRS is distorted by the presence of extracerebral layer. Change of optical parameters in gray matter layer will then be inappropriately converted into the brain activity response. In the current study, a five-layer structure model constitute of scalp, skull, cerebrospinal fluid, gray matter and white matter is adopted and the mixture of the Intralipid, India ink and agar is applied to fabricate human brain tissue...
January 28, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30689430/physiological-interference-reduction-for-near-infrared-spectroscopy-brain-activity-measurement-based-on-recursive-least-squares-adaptive-filtering-and-least-squares-support-vector-machines
#19
Xin Liu, Yan Zhang, Dan Liu, Qisong Wang, Ou Bai, Jinwei Sun, Peter Rolfe
Near infrared spectroscopy is the promising and noninvasive technique that can be used to detect the brain functional activation by monitoring the concentration alternations in the haemodynamic concentration. The acquired NIRS signals are commonly contaminated by physiological interference caused by breathing and cardiac contraction. Though the adaptive filtering method with least mean squares algorithm or recursive least squares algorithm based on multidistance probe configuration could improve the quality of evoked brain activity response, both methods can only remove the physiological interference occurred in superficial layers of the head tissue...
January 28, 2019: Computer Assisted Surgery (Abingdon, England)
https://read.qxmd.com/read/30689426/super-resolution-reconstruction-for-medical-image-based-on-adaptive-multi-dictionary-learning-and-structural-self-similarity
#20
Fang Zhang, Yue Wu, Zhitao Xiao, Lei Geng, Jun Wu, Jia Wen, Wen Wang, Ping Liu
To improve the quality of the super-resolution (SR) reconstructed medical images, an improved adaptive multi-dictionary learning method is proposed, which uses the combined information of medical image itself and the natural images database. In training dictionary section, it uses the upper layer images of pyramid which are generated by the self-similarity of low resolution images. In reconstruction section, the top layer image of pyramid is taken as the initial reconstruction image, and medical image's SR reconstruction is achieved by regularization term which is the non-local structure self-similarity of the image...
January 28, 2019: Computer Assisted Surgery (Abingdon, England)
journal
journal
53936
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"