Conventional CT scan the scan is taken slice by slice and after each slice the scan stops and moves down to the next slice eg, from the top of the abdomen down to the pelvis. This requires patients to hold their breath to avoid movement artefact. Spiral/helical CT scan this is a continuous scan which is taken in a spiral fashion. It is a much quicker process and the scanned images are contiguous.

We introduce the notion of a slice of a distributed computation. A slice of a distributed computation with respect to a global predicate is a computation which captures those and only those consistent cuts of the original computation which satisfy the global predicate. We show that a slice exists for a global predicate iff the predicate is a regular predicate. We then give an efficient algorith...

Conventional CT scan the scan is taken slice by slice and after each slice the scan stops and moves down to the next slice eg, from the top of the abdomen down to the pelvis. This requires patients to hold their breath to avoid movement artefact. Spiral/helical CT scan this is a continuous scan which is taken in a spiral fashion. It is a much quicker process and the scanned images are contiguous.

The chemical-shift effect often degrades slice selectivity thereby degrading the contrast and spatial resolutions in a high-field NMR imaging. We propose a new pulse sequence which can compensate for this chemical-shift effect during slice selection. This technique provides correct slice definition as well as clear separation between water and lipid protons in high-field proton NMR imaging. Par...

Dynamic causal modeling (DCM) of functional magnetic resonance imaging (fMRI) data allows one to make inferences about the architecture of distributed networks in the brain, in terms of effective connectivity. fMRI data are usually acquired using echo planar imaging (EPI). EPI sequences typically acquire slices at different times over a few seconds. DCM, in its original inception, was not infor...

Perfusion-weighted imaging techniques employing blood water protons as an endogenous tracer have poor temporal resolution because each image should be acquired with an adequate spin 'tagging' time. Thus, perfusion-based functional magnetic resonance imaging studies are typically performed on a single slice. To alleviate this problem, a multi-slice flow-sensitive alternating inversion recovery t...

We describe here the first working prototype of a novel display for viewing 3D medical images. The position and orientation of a freely movable touch-screen display are optically tracked and used to continuously determine which slice to display within a 3D data set. The slice is registered “in situ” relative to a fixed coordinate system, through which the display is moved. We have coined the te...

This paper proposes a segmentation method and a three-dimensional (3-D) volume calculation method of cysts in kidney from a number of computer tomography (CT) slice images. The input CT slice images contain both sides of kidneys. There are two segmentation steps used in the proposed method: kidney segmentation and cyst segmentation. For kidney segmentation, kidney regions are segmented from CT ...

Longitudinal partial volume effects (z-axial PVE), which occur when an object partly occupies a slice, degrade image resolution and contrast in computed tomography (CT). Z-axial PVE is unavoidable for subslice objects and reduces their contrast according to their fraction contained within the slice. This effect can be countered using a smaller slice thickness, but at the cost of an increased im...

Efforts are being made to develop a new type of CT system that can scan volumes over a large range within a short time with thin slice images. One of the most promising approaches is the combination of helical scanning with multi-slice CT, which involves several detector arrays stacked in the z direction. However, the algorithm for image reconstruction remains one of the biggest problems in mul...