Automatic Initialization Of Contour For Level Set Algorithms Guided By Integration Of Multiple Views To Segment Abdominal CT Scans

This paper presents a new automatic initialization procedure for a level-set based segmentation algorithm that works on all slices for a given CT dataset

To determine the incidence of post-operative deep vein thrombosis in general surgical patients of Hospital Universiti Sains Malaysia

Apparent rarity of post-operative DVT and pulmonary embolism in Asian patients was first reported since 1964. Very few literature and clinical studies were done for post-operative DVT in Asian population as well as in Malaysia.Compared to the Western hemisphere,low incidence 2.6% to 15.3% was reported from Japan, Hong Kong, Thailand, Singapore and Malaysian studies.Conflicting results of high incidence in orthopaedic patients was reported in two other Asian studies from Hong Kong and Malaysia.To find out the incidence of post-operative deep vein thrombosis (DVT) in our general surgical patients after major surgical procedures.To find out the subgroups of patients at special risk to post-operative DVT.To reviewthe policy of withholding routine DVT prophylaxis in Malaysian patients

Review: A critical overview of limitations CFD Modeling in nasal airflow.

Computational fluid dynamics (CFD) modeling of nasal airflow has been carried out by several researchers. Virtual surgical treatment and aerosol deposition studies have also been conducted. However, the appropriateness of such modeling practices with regards to modeling and medical constraints needs careful consideration. The current numerical models for the study of nasal airflow, developed from the scanned images obtained from computed tomography or magnetic resonance imaging, are influenced by postural changes. These models neglect the mucous layer, other vital anatomical features, and nasal cycle effects, CFD studies make numerous assumptions that seriously limit their usefulness. Unless these constraints can be addressed, the interpretation of results from a CFD output cannot be considered as an appropriate definition of the flow behavior. This review provides a critical overview of the limit actions of the CFD mode ling of nasal air-low. Some of the limitations and constraints associated with CFD modeling are reviewed and possible studies that could be carried out in the future to ascertain the effect of neglecting these parameters are discussed. This study also proposes a standard station of the computational modeling procedure, which is necessary for studying airflow inside the nasal cavity

Computational fluid dynamics study of pull and plug flow boundary condition on nasal airflow

The recent advances in the computer based computational fluid dynamics (CFD) software tools in the study of airflow behavior in the nasal cavity have opened an entirely new field of medical research. This numerical modeling method has provided both engineers and medical specialists with a clearer understanding of the physics associated with the flow in the complicated nasal domain. The outcome of any CFD investigation depends on the appropriateness of the boundary conditions applied. Most researchers have employed plug boundary condition as against the pull flow which closely resembles the physiological phenomenon associated with the breathing mechanism. A comparative study on the effect of using the plug and pull flow boundary conditions are evaluated and their effect on the nasal flow are studied. Discretization error estimation using Richardson's extrapolation (RE) method has also been carried out. The study is based on the numerical model obtained from computed tomographic data of a healthy Malaysian subject. A steady state Reynold averaged Navier–Stokes and continuity equations is solved for inspiratory flow having flow rate 20 L/min representing turbulent boundary conditions. Comparative study is made between the pull and plug flow model. Variation in flow patterns and flow features such as resistance, pressure and velocity are presented. At the nasal valve, the resistance for plug flow is 0.664 Pa-min/L and for pull flow the value is 0.304 Pa-min/L. The maximum velocity at the nasal valve is 3.28 m/s for plug flow and 3.57 m/s for pull flow model

The Determination Of Local Malay Female Bone Mineral Density And Its Correlation With Geometric Properties In The Evaluation Of Skeletal Status.

To establish bone mineral density ( BMD ) reference data for local Malay female population and to determine the correlation of BMD and geometric properties Methoelology: A total of 137 Malay female volunteers who have given a written informed consent have undergone DEXA of the spine, dual femur and total body using LUNAR PRODIGY, GE Medical Systems

Analysis of pediatric subdural empyema outcome in relation to computerized tomography brain scan

A cross-sectional study was conducted to predict the outcome in patients with subdural empyema, using initial and post-treatment CT scan brain parameters. Data collection was done on those children who were diagnosed to have subdural empyema by CT scan of the brain with contrast, who underwent burrhole evacuation, from February 2000 until April 2002. Numerous factors, such as coma or loss of unconsciousness at diagnosis, age, types of antibiotic, microbiology, extension of empyema, associated cerebral infarction and ventriculitis, were analyzed. Poor prognosis was associated with loss of consciousness, and hypodensity by CT scan at presentation (p < 0.005). Patients with an extensive subdural empyema will have a good outcome if they are treated early and aggressively with antibiotics and burrhole evacuation

ORIGINAL ARTICLE - COMPARISON BETWEEN 3D TOF MAGNETIC RESONANCE ANGIOGRAPHY AND INTRAARTERIAL DIGITAL SUBTRACTION ANGIOGRAPHY IN IMAGING THE CIRCLE OF WILLIS

This study was done compare the accuracy of non-contrast enhanced 3D time of flight magnetic resonance angiography (3D TOF MRA) with intraarterial digital subtraction angiography (IADSA) in depicting the arterial segments of the circle of Willis. 398 arterial segments were analysed from 38 patients who underwent both non-contrast enhanced 3D TOF MRA and IADSA examinations in Hospital Universiti Sains Malaysia from November 1998 to December 2000. Two observers performed blinded retrospective analysis of the IADSA images and Maximum Intensity Projection display of the 3D TOF MRA of the circle of Willis on separate sessions. Non-contrast enhanced 3D TOF MRA was sensitive and specific in depicting the A1, A2, M1, P1 and Anterior Communicating segments of the circle of Willis with a sensitivity ranging from 94.5% to 100% and specificity ranging from 90.5% to 100%. However it was poor in depicting the Posterior Communicating segments with a sensitivity of 21.4%. MIP display of the non-contrast enhanced 3D TOF MRA is sensitive in depicting the anatomy of the circle of Willis except for the PCOM segment. It is thus a reliable method for screening of this arterial circle

Radionuclide study in gastroparesis: Is it still relevant?

The incidence of gastroparesis in Malaysia is not well documented. It is diagnosed based on clinical symptoms and exclusion of the obstruction. Here a case of a young adult woman with type 1 diabetes mellitus suffering severe gastrointestinal symptoms. In this case, radionuclide scintigraphy is used as one of the investigation to confirm the diagnosis of gastroparesis