Quiz: MR Spectroscopy 1

Objectives: This course provides an introduction to Magnetic Resonance Spectroscopy and is intended for basic scientists, physicists and academic radiologists who enter the field or who want to refresh their knowledge. It reviews the basic principles of MRS, the status of clinical applications, pre-scan adjustments and hardware requirements.

1. The Larmor precession frequency depends on...*

The magnetic field B₀
The gyromagnetic ratio γ
The magnetic field B₀ and the gyromagnetic ratio γ
The magnetic field B₀, the gyromagnetic ratio γ and the RF-field B₁

Jump to the relevant part of the video for question 1:

2. Why is the excitation RF-field mostly applied at the Larmor frequency?*

Because there would be no effect on the spin system with the RF-field set apart from the Larmor frequency
Because in this case the B₁ field is in resonance with the spin system having a coherent effect on the magnetization M₀
Because the radiofrequency coil is tuned to the Larmor frequency
Because the B₁ field increases the magnetization M₀ on resonance with the Larmor frequency

Jump to the relevant part of the video for question 2:

3. Chemical shifts originate from...*

The free induction decay
Magnetic momentum
Relaxation effects
Electron shielding

Jump to the relevant part of the video for question 3:

4. Which of the following quantities is not changed at different magnetic field strength?*

Chemical shift (in ppm)
Nuclear spin population in an energy state
Signal to noise
Energy difference between two energy states of nuclei with nonzero spin quantum number

Jump to the relevant part of the video for question 4: