MRI MRI Image Quality and Optimization 2

Question 1

Which coil type generally provides the highest SNR for imaging a small superficial structure?

Accepted Answer

Surface coil

Answer

Volume coil

Answer

Body coil

Answer

Quadrature head coil

Question 2

What is the effect of increasing receiver bandwidth on MRI image quality?

Accepted Answer

SNR decreases but chemical shift artifact is reduced

Answer

SNR increases and scan time decreases

Answer

Image contrast improves significantly

Answer

Spatial resolution decreases

Question 3

In MRI, what does the term 'k-space' represent?

Accepted Answer

The raw frequency-domain data before Fourier transformation into an image

Answer

The final reconstructed image space

Answer

The physical space inside the MRI bore

Answer

A map of gradient field inhomogeneities

Question 4

Which portion of k-space primarily determines image contrast?

Accepted Answer

The center (low spatial frequencies)

Answer

The periphery (high spatial frequencies)

Answer

The edges equally with the center

Answer

The corners of k-space only

Question 5

A technologist increases slice thickness from 3 mm to 6 mm. What is the expected change in image quality?

Accepted Answer

SNR improves but through-plane resolution decreases

Answer

Both SNR and spatial resolution improve

Answer

SNR decreases and spatial resolution improves

Answer

No change occurs because FOV is unchanged

Question 6

What is the purpose of applying a saturation band in MRI?

Accepted Answer

To suppress signal from specified tissue or flowing blood to reduce artifacts

Answer

To increase SNR from the target anatomy

Answer

To improve spatial resolution in the phase direction

Answer

To shorten the overall scan time

Question 7

Which of the following best describes the concept of signal-to-noise ratio (SNR) in MRI?

Accepted Answer

The ratio of mean signal intensity in a region of interest to the standard deviation of background noise

Answer

The number of signal averages divided by scan time

Answer

The difference in signal between two adjacent tissues

Answer

The ratio of TE to TR