Introduction: Spiral data acquisition has gained in popularity over the past decade since it has several advantages over rectilinear acquisition methods. These advantages include short acquisition time and reduced sensitivity to flow artifacts. In spiral imaging, k-space data are efficiently collected along spiral trajectories during relatively long readout. Since the total number of TR cycles ...

Chirality represents a fundamental property of spiral waves. Introducing obstacles into cardiac monolayers leads to the initiation of clockwise-rotating, counterclockwise-rotating, and pairs of spiral waves. Simulations show that the precise location of the obstacle and the pacing frequency determine spiral wave chirality. Instabilities predicted by curves relating the action potential duration...

The k-space trajectory can be chosen as spiral-out, spiral-in, or spiral in-out (both), controlled by a user CV. In the later case, two separate sets of images are obtained having a common TE (defined as the center of k-space), and they may be combined after reconstruction as desired. See ref. 5 for discussion of the philosophy of the spiral-in approach, as well as methods of combining the two ...

ASE spiral for ROIs within five different cortical regions, where the SNR in each region is normalized to the SNR obtained using ASE spiral (summed using SS). The three ROIs on the right are located in SFG regions. None differ significantly. Figure 1: Z-shim ASE Triple Spiral sequence, showing acquisition of up to 3 spiral images per excitation with z-shim gradient before each acquisition. Z-sh...

Extensive experimental results for various square spiral inductors on GaAs substrate are presented in this paper. Through detailed studies of the inductances extracted from the de-embedded onchip measured S-parameters, the relationships between the electrical characteristics and the geometrical parameters of the spiral inductors are revealed. Based on the curve fitting technique, a behavioral m...

Retrograde degeneration of spiral ganglion cells in the cochlea following hair cell loss is similar to dying back in pathology. The EFR3A gene has recently been discovered to be involved in the pathogenesis of dying back. The relationship of EFR3A and spiral ganglion degeneration, however, was rarely investigated. In this study, we destroyed the hair cells of the mouse cochlea by co-administrat...

PURPOSE To verify if titanium spiral tacks may contribute to intra-abdominal adhesion formation in rabbits. METHODS Ten New Zealand white rabbits were used. Through videolaparoscopic surgery two titanium spiral tacks (ProTack(®), Covidien(®)) were applied in the right flank. After 30 days the animals were submitted to evaluate peritoneal cavity by videolaparoscopy. RESULTS No adhesion was f...