Which of the followings is not appropriate for imaging a thinner slice?

Frequency encoding gradient along x-axis enables to discriminate the objects in different x positions because they had different precession frequencies along x-axis.

The following two pulse sequences have the same area of phase encoding gradients. The echoes from these sequences are different because the gradient waveforms are different from each other.

Which statement about K-space is not correct?

Which statement is correct?

Which is the correct statement regarding slice selection?

You want to image a slice that is 5cm off-center along z-axis. When the strength of the slice selection gradient is 0.2 G/cm, what is the difference between the transmission frequencies for excitation of the 5cm off-center and the isocenter (0cm off-center)? (Hint : $\hat{\gamma}$=$\gamma$/2$\pi$ = 42.58MHz/T = 4258 Hz/G)

You want to image a slice with 1-cm thickness. When the RF bandwidth is 1kHz, what should be strength of the slice selection gradient? (Hint : $\hat{\gamma}$=$\gamma$/2$\pi$ = 42.58MHz/T = 4258 Hz/G)

Slice selection should always be performed by applying an RF pulse in the existence of a slice selection gradient.

After slice selection, a frequency encoding gradient and a phase encoding gradient are applied with 0.5 G/cm for 1ms and -0.2G/cm for 0.5ms, respectively, before sampling a data point. What is kx and ky? Assume both gradients are rectangular pulses.

The center 10 lines of the k-space are from the center 10 lines of the corresponding MR image.

Which statement is not correct about slice refocusing gradient and readout prephase gradient?

Because of an unknown problem, the prephase gradient is applied with only half the area of the usual area as shown in the pulse sequence diagram. Choose a possible echo shape in the sampled data. (pulse sequence diagram below)

Which statement is not correct about frequency encoding and phase encoding?

Which is the most possible k-space trajectory of the gradient waveforms? Assume that the displayed gradients start right after the slice selection and slice refocusing gradient and that X and Y gradients correspond to $k_{x}$ and $k_{y}$. (gradient waveforms shown below)