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Minimally invasive surgery offers advantages that make it the best choice for many diseases. The Virtual Reality technology gives a great support to this kind of surgical procedures through medical image processing and visualization, 3D organ's reconstruction and intra-operative surgical guidance. In this paper is presented an advanced visualization and navigation system and the surgeon has the possibility...
Gliomas are the most common primary brain tumors, with a typical infiltrative growth pattern along white matter (WM) fibers. Diffusion Tensor Imaging (DTI) is sensitive to the directional diffusion of water along WM tracts, which allows the identification of subtle peritumoral glioma infiltration that are not apparent on conventional Magnetic Resonance imaging. The aim of this study was to characterize...
Most existing approaches for tracking of the beating heart motion assume known cardiac kinematics and material parameters. However, these assumptions are not realistic for application in beating heart surgery. In this paper, a novel probabilistic tracking approach based on a physical model of the heart surface is presented. In contrast to existing approaches, the physical information about heart kinematics...
In this paper, a fast and robust graph-based approach for boundary estimation of fiber bundles derived from Diffusion Tensor Imaging (DTI) is presented. DTI is a non-invasive imaging technique that allows the estimation of the location of white matter tracts based on measurements of water diffusion properties. Depending on DTI data, the fiber bundle boundary can be determined to gain information about...
In laser eye surgery, the accuracy of operation depends on coherent eye tracking and registration techniques. Main approach used in image processing based eye trackers is extraction and tracking of pupil and limbus regions. In eye registration step, iris region features extracted from infrared images are used generally. Registration step determines the angular shift of eye origin by comparing the...
The anterior cruciate ligament (ACL) plays important role as a preventing excessive anterior movement of the knee. When the ACL is injured, ACL reconstruction is often performed. In ACL reconstruction, bone tunnels of the femur and tibia are made for passing graft to the bone. It is reported that the bone tunnel is usually enlargement. The bone tunnel enlargement affects much knee function. In serious...
This paper presents an individual designing prosthesis for surgical use and proposes a methodology for such design through mathematical extrapolation of data from digital images obtained via tomography of individual patient's bones. Individually tailored prosthesis designed to fit particular patient requirements as accurately as possible should result in more successful reconstruction, enable better...
3D medical model is widely used in modern surgery, and image processing is the main method for its reconstruction. Because the structure and shape of human organs are very complicate, triangular mesh is more appropriate than 4-sides path surface for medical model. To promote the application of 3D medical model based on digital triangular meshes, technologies of precise reconstruction via image processing,...
Propose: Idiopathic orbital inflammatory pseudotumors (IOIP) are inflammatory pseudotumors (IPT) of unknown etiology that develop in the orbit. Due to the lack of well-defined pathogenic mechanisms and diagnostic markers, diagnosis and treatment of this disease remain a significant challenge. Therefore, the aims of this study are to define the etiological factors of IOIP and to identify potential...
Frontal-orbital advancement is the accepted surgical treatment for correcting the cranial deformity associated with premature fusion of one of the coronal cranial sutures. Removal and reshaping of the brow and lower forehead bone is performed to correct ipsilateral frontal flattening and parietal bulging, recession of the supraorbital rim, and contralateral forehead bossing. In addition to the functional...
MR images acquired from open magnetic resonance system have been applied to guide percutaneous puncture for ablation of liver tumors recently. However, the MR images do not always show the tumors clearly because of the lower magnetic field (0.5T) and various different surgical and pathological conditions. In our study, we use preoperative CT images to assist locate tumors by registration. In our method,...
High Intensity Focused Ultrasound (HIFU) system has been successfully applied to the tumor therapy. It is crucial to localize the tumor region accurately in this system. In this paper, a semi-automatic non-rigid registration algorithm is presented to implement the image-guided surgery navigation and localization by registration of pre-operative CT/MRI images and intra-operative US images. The global...
3D shape reconstruction of the liver from its 2D cross-sections improves the surgeon's knowledge of liver anatomy and makes even more complicated liver surgery safe, which can be employed to aid clinical practice as an alternative tool. In this paper, a new method for 3D reconstruction of liver is proposed. It mainly consists of three steps: liver auto-segmentation, surface reconstruction and surface...
Radiology plays important roles in orthopaedic surgery. Although various conventional radiological assessments including digital X-rays, magnetic resonance imaging (MRI), computerized tomography (CT) and the three-dimensional (3D) CT reconstruction images have been widely developed and utilized for preoperative assessment and planning, there are limitations. For example, despite the advances in 3D...
Wireless Capsule Endoscopy (WCE) is an endoscopy technology that allows medical personnel to view the digestive tract non-invasively. Physicians can detect diseases such as blood-based abnormalities, polyps, ulcers and Crohn's disease. In previous papers we have proposed methodologies that deal with such abnormalities. In the current paper we are proposing a novel approach to visualize the digestive...
Modular software design is a technique that increase reusability and portability of software composed from separate parts, called modules. We have designed and developed a reusable integrated software solution for robotic prostate brachytherapy procedure. The application is capable of concurrent handling of all aspects of the image-guided brachytherapy procedure: ultrasound image acquisition, anatomic...
This paper presents an integrated system for detecting facial changes of patient in a hospital in Intensive Care Unit (ICU). The facial changes are most widely represented by eyes and mouth movements. The proposed system uses color images and it consists of three modules. The first module implements skin detection to detect the face. The second module constructs eye and mouth maps that are responsible...
Laparoscopic virtual reality based surgery simulators are becoming a ubiquitous tool in resident training and assessment. Abdominal organ surface are major visual cue of laparoscopic imagery, so it makes sense to develop algorithms of generation of texture of the abdominal organs. This paper presents a method of organ texture generation with Perlin noise. The noise function, interpolation function...
C-arms are increasingly being used to assist in a large number of surgical procedures. Fairly accurate and fast pose estimates are needed for non-encoded c-arms that are commonly available in most operating rooms in order to attain quantitative feedback from the x-ray images. We propose the use of an image-based fiducial composed of a set of coplanar ellipses to track the c-arm. We adopt an existing...
Deep brain stimulation (DBS) is a surgical treatment involving the implantation of a medical device called a brain pacemaker, which sends electrical impulses to specific regions of the brain for treatment of movement disorders. Because of the small size of the surgical target and possible shift of the deep brain structures due to air invasion when the dura is opened, intra-operative adjustment of...
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