The basic principles of scintigraphy are reviewed and extended to 3D imaging. Single-photon emission computed tomography (SPECT) is a sensitive and specific 3D technique to monitor in vivo functional processes in both clinical and preclinical studies. SPECT/CT systems are becoming increasingly common and can provide accurately registered anatomic information as well. In general, SPECT is affected by low photon-collection efficiency, but in brain imaging, not all of the large FOV of clinical gamma cameras is needed: The use of fan- and cone-beam collimation trades off the unused FOV for increased sensitivity and resolution. The design of dedicated cameras aims at increased angular coverage and resolution by minimizing the distance from the patient. The corrections needed for quantitative imaging are challenging but can take advantage of the relative spatial uniformity of attenuation and scatter. Preclinical systems can provide submillimeter resolution in small animal brain imaging with workable sensitivity.
We report the computation of the matrix element of the chromomagnetic
Operator of the flavour changing neutral current (FCNC)-type between a $B$- or
$D$-meson state and a light hadron and off-shell photon. The computation is
Carried out by using the method of light-cone sum rules (LCSR). It is found...
We propose an alternative scheme to implement the quantum state transfer
Between two three-level atoms based on the invariant-based inverse engineering
In cavity quantum electronic dynamics (QED) system. The quantum information can
Be ultrafast transferred between the atoms by taking advantage of th...
We show that somatostatin-expressing interneurons exert compartmentalized control over postsynaptic Ca(2+) signals within individual dendritic spines. This highly focal inhibitory action is mediated by a subset of GABAergic synapses that directly target spine heads. GABAergic inhibition thus partici...
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