ARMRIT-Practice Test (part 1 Mri Physics and Ins.) Questions With Verified Answers

The T1 process is also known as: - Answer Spin Lattice Which type of electromagnetic coils produce smaller magnetic field which allow spatial localization to be performed? - Answer Gradient coils The component Mxy is most associated with: - Answer Transverse to Bo; T2 relaxation; Transverse magnetization The resonance frequency of any substance in a magnetic field can be calculated by employing the: - Answer Larmor equation Once the patient's area of interest is placed in the main magnetic field of the MRI system, the hydrogen protons will: - Answer Precess parallel to Bo The longitudinal component of the NMV is designated: - Answer Mz Which type of MRI magnet requires no electricity to maintain it's magnetic field and can weigh from 18,000 lb. to 200,000 lb.? - Answer Permanent The component Mz is the most associated with: - Answer Parallel to Bo; T1 relaxation; Longitudinal magnetization Which statement is true of the relaxation process? - Answer Without the effects of T2* (star), T2 decay continues To describe the uniformity of the Mri systems main magnetic field, the term employed is: - Answer Homogeneity Methemoglobin and gadolinium based contrast agents have magnetic properties that shorten both T1 and T2 values in adjacent tissues. What type of substances are they? - Answer Paramagnetic