Due to the inherently limited resolution of Positron Emission Tomography (PET) scanners, quantitative measurements taken from PET images suffer from the partial volume averaging of activity across regions of interest. A correction for this effect in PET activity distributions is therefore essential to distinguish differences due to changes in tracer concentration from those due to changes in th...

The classification of diffuse lung opacities in thinsection computed tomography(HRCT) images is an important step for developing a computer-aided diagnosis(CAD) system. In designing the CAD system for classifying diffuse lung opacities in HRCT images, a Gabor filter-based approach has been shown to be effective. In order to improve further the classification performance of the CAD system, we ex...

Non-invasive prediction of optimal targets for e cient radiofrequency ablation is a major challenge in the treatment of ventricular tachycardia. Most of the related modelling work relies on magnetic resonance imaging of the heart for patient-speci c personalized electrophysiology simulations. In this study, we used high-resolution computed tomography images to personalize an Eikonal model of ca...

The identification of pulmonary air bubbles might play a significant role for medical diagnosis of pulmonary pathologies. A method to segment these abnormal pulmonary regions on volumetric data, using a deformable model deforming towards the objects of interest is presented. We propose a variant to the well known level-set method that keeps the level-set function moving along desired directions...

A pre-segmentation algorithm for computed tomography angiograms (CTA) is described. It is based on adaptive thresholding. The median axis of the binarized image provides arterial centerlines and estimates of the local radii. Boundary location is refined by analyzing radial intensity profiles in the vicinity of their intersections with the thresholds. The thresholding rule was learned on CTAs of...

The role of orbital computed tomography (CT) in the management of retinoblastoma is reviewed. All 21 patients with retinoblastoma studied with high-resolution computed tomography had intraocular calcification demonstrable in at least one eye. 83% of tumours showed evidence of calcification on CT scan. The degree of calcification appeared to depend on tumour size; only small tumours were devoid ...

introduction: endoscopy is an invasive procedure and finding noninvasive alternative tools in detection of probable upper gastrointestinal (gi) tract injuries following caustic ingestion is an area of interest. the present study aimed to evaluate the screening performance characteristics of thoraco-abdominal computed tomography (ct) scan in this regard. methods: this prospective cross sectional...

Purpose: To assess the repeatability of central corneal thickness measurement at the geometrical center (Central Corneal Thickness CCT) given by the Pentacam High Resolution (HR) Comprehensive Eye Scanner (Oculus, Wetzlar, Germany) over time. Methods: Prospective, single center, observational study. Two separate CCT measurements were taken by the Pentacam corneal tomography exam (CTm) 3 to 12 m...

A high resolution micro-computed tomography (μCT) system complemented by specialized hardware and software tools were used to provide quantitative characterization for a tapered ultrathin wall space component at NASA. The CT data served two purposes: first to assess whether an acceptable flaw condition based on acceptable use requirements existed and second to provide comprehensive flaw measure...