Methods A myocardial perfusion sequence (balanced SSFP) was modified to vary field-of-view and in-plane offsets during each single-shot rawdata acquisition to “zoom” in [or out] following myocardial contraction [filling]. FOVzoom varied linearly during raw data acquisition, and for each phase-encode line p scaled the FOV and inplane offsets by factor Sc(p) = 1 + ((Db De)/De) x (pN/2)/N where Db...

Purpose This study aimed to evaluate the effect of field-of-view (FOV) size on the gray values derived from conebeam computed tomography (CBCT) compared with the Hounsfield unit values from multidetector computed tomography (MDCT) scans as the gold standard. Materials and Methods A radiographic phantom was designed with 4 acrylic cylinders. One cylinder was filled with distilled water, and th...

Contemporary imaging air Cherenkov telescopes (IACT) for ground-based very high energy (VHE) gamma-ray astronomy have prime focus optical design. Typically these telescopes have a (2−4) wide field of view (FoV). They use F/0.7-F/1.2 optics and provide (3−10) ′ resolution in the FoV. Generally, a well designed telescope that includes more than one optical element will offer some advantages not a...

Abstract Background Changes in renal blood flow (RBF) may play a pathophysiological role hypertension and kidney disease. However, RBF determination humans has proven difficult. We aimed to confirm the feasibility of estimation based on positron emission tomography/computed tomography (PET/CT) rubidium-82 ( 82 Rb) using abdominal aorta as input function 1-tissue compartment model. Methods Eight...

In many applications of dynamic MR imaging, only a portion of the field-of-view (FOV) exhibits considerable variations in time. In such cases, a prior knowledge of the static part of the image allows a partial-FOV reconstruction of the dynamic section using only a fraction of the raw data. This method of reconstruction generally results in higher temporal resolution, because the scan time for p...

Introduction Geometric distortions in Echo Planar Imaging (EPI) are dependent on two sequence parameters: the phase encoding FOV and the echo spacing between two consecutive ky lines, both of which affect the k-space traversal speed. Assuming that a maximum readout gradient bandwidth is used, the echo spacing can be reduced by decreasing the resolution in the kx (not ky!) direction. Both Short ...

Background: 3-dimensional (3D) imaging, such as cone beam computed tomography (CBCT), has recently become more widely utilized. While one eventual goal of 3D imaging is to provide a means of replacing traditional dental casts, further research needs to be done in testing the accuracy of these scans when used to produce tooth models. Objective: To objectively examine the accuracy of tooth models...

Texture information about surface shape can be decomposed into three constituents: compression, density and scaling. Blake, Bülthoff and Sheinberg's (1993, Vision Research, 33, 1723-1737) Ideal Observer theory of slant from texture predicts that the relative contribution of compression and density to the percept of planar surface slant should vary with field of view (FOV). The contribution of c...