MRI Mid-Course Exam 2024

Which scientist could generate 2D display of tissues, proton density and relaxation times?

• Damadian

• Lauterbur

• Bloch

• Purcell

Which 2 scientists contributed to applying NMR to malignant tissue as well as measuring blood flow?

• Einst and Singer

• Singer and Lauterbur

• Lauterbur and Damadian

• Damadian and Singer

Which scientist detected and measured single states of rotation of molecules and atoms, determining the magnetic moments of the nuclei?

• Rabi

• Damadian

• Pauli

• Mansfield

All of the following atoms have a spin with the exception of :

• B

• Be

• Li

• N

Hydrogen atoms, _________ in the presence of a uniform magnetic field?

• are not affected by the magnetic field

• line up along the field and rotate around its axis

• line up along the field and precess around its axis

• remain oriented mostly randomly and precess around the field axis

The electric charge on the surface of a proton generates __________ and the mass of the proton generates ____________ as the proton spins

• precession, magnetic dipole moment

• magnetic dipole moment, angular momentum

• angular moment, torque

• magnetic dipole moment, larmor frequency

Calculate the larmor frequency of a proton with a magnetic field strength of 1.57 (the gyromagnetic ratio, y, of hydrogen = 42.6 MHz/T )

• 6.4 MHz

• 604 MHz

• 64 MHz

• 640 MHz

T1 is called 1) longitudinal relaxation time, 2) energy relaxation time, 3) thermal relaxation time, 4) spin-lattice relaxation time.

• 1, 2 and 3

• 1, 3 and 4

• 1, 2 and 4

• All of the above

The decay of transverse magnetization is caused by a combination:

• spin-spin relaxation, magnetic field inhomogeneity

• spin-rotate relaxation, magnetic field inhomogeneity

• spin-rotate relaxation, magnetic field homogeneity

• spin-spin relaxation, magnetic field homogeneity

A) T2, B) T1, C) PD

• T2, PD, T1

• T2, T1, PD

• T1, PD, T2

• T1, T2, PD