BACKGROUND The introduction of the new simultaneous PET/MRI scanner opens new opportunities in functional imaging. SOURCES OF DATA This article is based on the literature review and our personal experience of the first simultaneous PET/MRI scanner in the UK. AREAS OF AGREEMENT PET/CT is well established and a key component of management guidance in a range of diseases. MRI has superior soft...

Between 1997 and the end of the detector operation in fall 2002, about 5500 hours of observational data were recorded with the HEGRA system of Imaging Atmospheric Cherenkov Telescopes (IACT). Besides dedicated scan observations of extended sky regions, a considerable fraction of the sky has been looked at as a side effect during the observations of selected source candidates. Altogether, more t...

Event-related potentials (ERPs) can be used in multisensory research to determine the point in time when different senses start to interact, for example, the auditory and the visual system. For this purpose, the ERP to bimodal stimuli (AV) is often compared to the sum of the ERPs to auditory (A) and visual (V) stimuli: AV - (A + V). If the result is non-zero, this is interpreted as an indicator...

The enormous progress made in functional magnetic resonance imaging technology allows us to watch our brains engage in complex cognitive and social tasks. However, our understanding of what actually is computed in the underlying cellular networks is hindered by the vast numbers of neurons involved. Here, we describe a vertebrate system, shaped for top speed, in which a complex and plastic decis...

Magnetic resonance diffusion imaging is potentially an important tool for the noninvasive characterization of normal and pathological tissue. The technique, however, is prone to a number of artifacts that can severely affect its ability to provide clinically useful information. In this study, the problem of eddy current-induced geometric distortions that occur in diffusion images was addressed,...

We study the transition of a quantum system from a pure state to a mixed one, which is induced by the quantum criticality of the surrounding system E coupled to it. To characterize this transition quantitatively, we carefully examine the behavior of the Loschmidt echo (LE) of E modeled as an Ising model in a transverse field, which behaves as a measuring apparatus in quantum measurement. It is ...

[This corrects the article DOI: 10.1371/journal.pone.0160115.].

Using the technique of nuclear magnetic resonance (NMR, MR, MRI), the first images displaying pathology in humans were published in 1980.(1) Since then, there has been a rapid extension in the use of the technique, with an estimated 225 machines in use in the USA at the end of 1985.(2) Considerable enthusiasm has been expressed for this new imaging technique,(3) although awareness of its high c...

MRI uses the magnetic properties of the hydrogen atoms present in the human body. It presents no risks as long as the contraindications (pacemaker, metal fragment in the eye, pregnancy less than 3 months) are complied with. MRI is the reference imaging method for exploration of the brain. The contrast of these images depends on the type of sequence used. More specific sequences (diffusio-weight...

A method is presented for simultaneous correction of linear geometric distortions and interscan patient motion in echoplanar imaging (EPI). The technique does not require the acquisition of specialized scans other than high-resolution magnetic resonance images. The method is based on a generalized surface-based coregistration algorithm, which accounts for a complete 3-dimensional affine transfo...