INTRODUCTION Computed tomography (CT) is the preferred diagnostic toolkit for head and brain imaging of head injury. A recent development is the invention of a portable CT scanner that can be beneficial from a clinical point of view. AIM To compare the quality of CT brain images produced by a fixed CT scanner and a portable CT scanner (CereTom). METHODS This work was a single-centre retrosp...

This report summarises work undertaken in support of a European Commission (EC) Concerted Action on CT that has included both a review and further development of the framework for CT dosimetry. The system previously established by the EC for reference doses in CT (with the quantities weighted CTDI (CTDIw) and dose-length product (DLP)) has been expanded to include subsequent developments in CT ...

Segmentation of lung tissue from CT images is a challenging task in computer aided diagnosis systems. In this work, a patient-specific, automated model based approach to segment lung is proposed. Patient specific shape knowledge is obtained by preprocessing the same patient’s stack of lung CT slices. The algorithm divides the patient's stack into many groups and the first ‘n’ slices with maximu...

introduction: in 2000, the unscear reported that ct constitutes 5% of all the medical x-ray  examinations and it contributes 34% of the resultant collective dose worldwide. children are more  sensitive to the ionizing radiations than adults. so, routine quality control tests are expected to be  carried out periodically on the ct scanners. the aim of this research was to estimate the effective  ...

Introduction: Head scans are the most frequently performed computed tomography (CT) examinations worldwide. However, there is growing concern over the probability of increased cancer risks among the exposed populations. Diagnostic reference levels (DRLs) identify radiation dose that is not commensurate with clinical objectives. The aim of this study was to establish DR...

Abstarct: The very hot and power-hungry x-ray filaments in today's computed tomography (CT) scanners constrain their design to be big and stationary. What if we built a CT scanner that could be deployed at the scene of a car accident to acquire tomographic images before moving the victim? Recent developments in nanotechnology have shown that carbon nanotubes can produce x-rays at room temperatu...

This paper describes a technique for automatically quantifying the shape of the skull cavity seen on an axial slice in a CT brain scan. The development ofthis algontbm derives from the need to normalise CT scan data acqording to skull size and shape for the purpose of compar;lg new patient data with that from past cases. This algorithm uses image processing techniques to fmdthe h i e r edge of ...

We present a simple method for robot registration in computer tomography imaging systems. The method uses the laser markers readily available on any CT scanner and does not require imaging thus eliminating radiation exposure. Its accuracy is inherited from the laser positioning system. This approach does not require additional hardware, laser alignment being performed on the instrument used in ...