In MRI, which energy form is used to excite nuclei after alignment by the magnetic field?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $25.99Unlock all

Prepare for the VetSkill Level 3 Diploma VN02 – Diagnostic Principles Test. Engage with multiple-choice questions, hints, and explanations. Achieve your certification!

Multiple Choice

In MRI, which energy form is used to excite nuclei after alignment by the magnetic field?

Explanation:
Radiofrequency energy is used to excite nuclei in MRI after they align with the external magnetic field. The strong field aligns the protons, creating a small energy gap between spin states that corresponds to a frequency in the radiofrequency range (the Larmor frequency). An RF pulse at that frequency provides just enough energy to tip the net magnetization away from the field and into the transverse plane, producing a detectable signal as they relax. Visible light, gamma rays, and sound waves don’t cause the required nuclear spin transitions, so they aren’t used to generate the MRI signal.

Radiofrequency energy is used to excite nuclei in MRI after they align with the external magnetic field. The strong field aligns the protons, creating a small energy gap between spin states that corresponds to a frequency in the radiofrequency range (the Larmor frequency). An RF pulse at that frequency provides just enough energy to tip the net magnetization away from the field and into the transverse plane, producing a detectable signal as they relax. Visible light, gamma rays, and sound waves don’t cause the required nuclear spin transitions, so they aren’t used to generate the MRI signal.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy