Found 30 Results

Automatic methods for tumor segmentation and follow-up in MR images

Abstract Magnetic resonance imaging (MRI) is the method of choice for the noninvasive assessment of tumors. The common treatment evaluation of tumors is based on MRI scans acquired every several weeks or months. It is crucial to accurately quantify the…

Planning safe trajectories in image-guided keyhole neurosurgery

Abstract Many image-guided keyhole neurosurgery procedures require the precise targeting of tumors and anatomical structures with a surgical tool inside the brain based on pre-operative CT/MRI images. A misplacement of the surgical tool from the planned trajectory may result severe…

Fast Semi-Automatic Plexiform Neurofibroma Tumor Segmentation in MRI Scans

Abstract Neurofibromatosis-1 (NF-1) is a common genetic disorder associated with the frequent occurrence of central and peripheral nervous system tumors. Plexiform Neurofibromas (PN) are one of the hallmarks of NF-1. These are benign nerve sheath tumors with a complex shape,…

fMRI-Based Detection and Classi cation of Liver Diseases Using Mice Models

Abstract The liver is the largest internal organ in the body, responsible for numerous metabolic, regulatory, transport, and immune functions. It is the second most commonly involved organ in metastatic disease, after the lymph nodes, and chronic diseases of the…

Modeling and preoperative planning for kidney surgery

Abstract Kidney surgery is a common and complex procedure. The procedure is required to remove kidney tumors and to treat a variety of renal malfunctions. Nowadays, a minimally invasive approach is the method of choice for partial nephrectomy operations. This…

Improving accuracy and safety in image-guided keyhole neurosurgery

Abstract Image-guided keyhole neurosurgery consists of targeting a straight surgical tool, such as a needle or a catheter, with a support guidance system towards a target location inside the brain. The target and trajectory are defined on a preoperative MRI/CT…

Nearly Automatic Aorta and Carotid Arteries Segmentation of Computed Tomography Angiography Patient Scans: Method and Experimental Results

Abstract The on-growing demand for preoperative planning tools and image guided procedures leads to intense efforts in the Medical Image Processing (MIP) field. One of the greatest challenges is the automatic segmentation, a fundamental requirement for patient-specific applications. This thesis…

Nearly Automatic Liver Vessels Segmentation of Computed Tomography Angiography Patient Scans: Method and Experimental Results

Abstract Advanced medical image processing is intensively studied to develop a high speed and high accuracy imaging technology to be integrated throughout the clinical procedure starting by the diagnostic stage, onwards to preoperative planning and even real-time procedures. Automatic segmentation…

Patient-Specific Quantitative Analysis of Bone Fracture Fixations: Evaluation of Clinical Application

Abstract When assessing a fracture, an orthopedic surgeon has to integrate multiple factors before deciding on the optimal treatment plan. These include patient-factors, surgeonspecific factors, hospital-specific factors and mainly fracture-specific factors such as bone quality, number of fragments and fracture…

Fluoroscopy-Based X-Ray Navigation in Orthopedics Using Electromagnetic Tracking: A Practical Study

Abstract Computer-assisted intra-operative navigation systems aim to improve the surgeon’s hand/eye coordination and spatial perception. In orthopedics, where the main intraoperative image modality is the X-ray fluoroscopy image, using a navigation system can minimize the number of fluoroscopic images used…

Registration of a CT-like atlas to fluoroscopic X-ray images using intensity correspondences

Abstract Intraoperative anatomy localization is a fundamental requirement for major computer aided surgery applications, such as fusion of images and sensor information from different sources with the real-time surgical situation, informing the surgeon on the locations of surgical tools relative…

Liver Tumor Segmentation and Volume Computation with User-Guided 3D Active Contours

Abstract Tumor volume computation is a crucial task routinely performed in radiology departments in order to assess the effectiveness of treatments. Today, radiologists perform this task by estimating the tumor volume using a set of simple guidelines. To improve this…

Preoperative planning and intaroperative registration for robot-based keyhole neurosurgery

Abstract This thesis describes a novel image-guided system for precise automatic targeting in minimally invasive keyhole neurosurgery. The system consists of a preoperative planning module, the MARS miniature robot fitted with a mechanical guide for needle/probe insertion and an intraoperative…

Miniature robot system for keyhole neurosurgery

Abstract This thesis presents a novel image-guided system for precise automatic targeting in keyhole minimally invasive neurosurgery. The system consists of a miniature robot fitted with a mechanical guide for needle/probe insertion. Intraoperatively, the robot is directly affixed to a…