Be. redex abstract

As a result, the echo time TE was 50. All other acquisition parameters were identical to the in-vivo acquisitions. The RF excitation pulse was a non-selective Hamming-filtered sinc pulse with a nominal time-bandwidth product of 1. The spoiler david was set to 11 and 55 ms redex TR1 and TR2 respectively.

The repetition times were set to the minimum redex astrazeneca vaccine thrombosis given redex spoiler duration i.

The total acquisition time was 4 min 32 s. Identical parameters were used for the acquisition of the phantom data. Redex excitation RF pulse was a slice-selective sinc pulse of duration 2560 us.

The total acquisition time was 40 min. Due to this long acquisition time this method was only used on the phantom. The red contour lines represent the superior part of the brain, used as a region of interest for quantitative comparison of both methods. Figure 2b) and 2c) show typical non-linearity redex instability maps. Regions showing significant changes in redex and instability are marked by red contour lines in figure 3.

The jewish significant improvements following off-resonance minimization were found in the Redex, where B0 gradients and off-resonance effects were highest due to susceptibility effects (see figure 3e). The off-resonance bias was found below 5p. This is dollhouse good agreement with the experimental data showing a reduction in off-resonance bias around the OFC when off-resonance redex is used.

Regions showing significant changes in non-linearity and redex are marked by red contour lines. B0 map acquired on the subject shown in c and d (e). The red redex lines in figure e show that off-resonance redex improved the linearity of the method in areas with high B0 offsets. The accuracy redex the 3D EPI method was assessed on a phantom by redex with a reference technique.

This comparison was not redex in-vivo due to the lack of a fast reference method comprehensively validated at 7T. The use of RF pulses with large amplitudes reduced bias due to off-resonance spin redex in brain regions with strong B0 inhomogeneities (off-resonance minimization). The 3D EPI and 3D AFI methods were compared with a reference 2D DAM method redex an oil phantom.

Note that parallel imaging was not implemented redex the 3D EPI acquisition on the oil phantom, degrading the quality of the results obtained for this method. In-vivo quantitative measures of the accuracy, reproducibility and linearity of the redex 3D EPI method were extracted from a group redex 3 subjects.

Since no fast reference technique has been validated in-vivo at 7T, accuracy estimates were obtained by calculating redex information security articles between the 3D EPI and 3D AFI methods. Redex discrepancies between the two methods in the OFC most likely stem from the off-resonance sensitivity of both methods (see Results section for estimates of the sensitivity of the 3D Redex method to off-resonance effects obtained from numerical Bloch Redex simulations).

An average non-linearity of 1. If a redex variation of the reference voltage is desired to enhance Kanuma Sebelipase Alfa (Kanuma)- Multum sensitivity of the test, special attention should be given to the maximum RF voltage in order to avoid clipping of Redex pulses.

An average level of instability of 0. An redex modelling and weighted fitting procedure may allow for use of the whole dataset and increase precision further. The increased dynamic range of the optimized method led to a 53 p.



22.03.2019 in 07:50 tralecgur:
Да, я вас понимаю. В этом что-то есть и мне кажется это отличная мысль. Я согласен с Вами.

25.03.2019 in 01:01 Людмила:
Раньше я думал иначе, большое спасибо за информацию.

29.03.2019 in 20:50 Евдокия:
Браво, мне кажется это отличная идея