Magnetic Resonance Imaging (MRI)correctly answered 2023

Magnetic Resonance Imaging (MRI)correctly answered 2023Magnetic Resonance Imaging takes advantage of what? - correct answer Magnetic Resonance Imaging takes advantage of the body's water content (~70%) and hence hydrogen atoms. Atom parts - correct answer A shell of electrons around a nuclei. Atomic nuclei contain - correct answer Protons Protons are " " and are constantly " " an axis - correct answer Positively Spinning around A positive charge spinning = - correct answer Moving electrical charge Charge moving in a loop gives rise to a - correct answer Magnetic dipole moment Protons in an external magnetic field - correct answer New slide Protons relation to a magnetic field - correct answer Protons will try to align themselves longitudinal (parallel) to an external magnetic field - produced by a supermagnet; typicall strength is 1.5 Tesla. Alignment can be either " " or " " - correct answer Alignment can be parallel to the external field or anti-parallel. Exact alignment - correct answer Exact alignment with the external B field is not possible, resulting in a spinning top action or precession about the vertical axis. The angular frequency - correct answer The angular frequency of precession is given by the the larmor equation Larmor frequency equation - correct answer Larmor frequency (omega_naught) = gamma*Magetic field (B_o). Spinning top action of protons in an external magnetic field. - correct answer Intitially there is an alignment of magnetization between the proton and the magnetic field. Eventually, the tipping of the net magnetization from the z-axis through an angle phi by the application of B1 field aligned along the x-axis causes m_o to spin about the z axis at the Larmor frequency.