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2025 Exam Complete Questions And Correct
Detailed Answers (Verified Answers) |Already
Graded A+
Who were the key figures in the development of
nuclear magnetic resonance (NMR)?
Felix Bloch and Edward Purcell studied NMR of
water and contributed to the understanding of
nuclear magnetism.
What significant discovery did Raymond Damadian
make regarding malignant tissues?
Damadian discovered that malignant tissues have a
different NMR spectrum than normal tissue,
showing differences in proton density, spin lattice,
relaxation time, and spin-spin relaxation time.
,What imaging method did Paul Lauterbur develop?
Lauterbur developed the first imaging method using
multiple magnetic field gradients, known as
zeugmatography.
What factors control the rotation of the net
magnetization vector in MRI?
The rotation is controlled by the strength of the
radiofrequency (RF) pulse and the duration of the
RF pulse.
What is the role of the magnetic field gradient in
MRI?
The magnetic field gradient spoils the homogeneity
of the magnet and provides spatial localization.
,What is the isocenter in the context of MRI?
The isocenter is the position where the gradient is
zero; moving away from it increases or diminishes
the magnetic field.
How does slice selection work in MRI?
Slice selection is determined by the steepness of
the magnetic field gradient and the bandwidth of
the RF pulse; a steeper gradient and narrower
bandwidth result in thinner slices.
What is bandwidth in MRI, and how does it relate to
the quality of an RF pulse?
Bandwidth is the range of frequencies contained
within the RF pulse; the quality value (Q) of a pulse
, is the center frequency divided by the bandwidth,
with higher Q indicating narrower bandwidth.
What is the effect of a pulsed gradient magnetic
field on net magnetization vectors?
During the pulsed gradient, each voxel's net
magnetization vector precesses at a frequency
determined by its position; when the gradient is
turned off, the vectors return to the same
frequency but retain a phase difference.
What is the purpose of phase encoding in MRI?
Phase encoding selects a particular spatial
frequency in one direction within the selected slice,
allowing for two-dimensional imaging.
2025 Exam Complete Questions And Correct
Detailed Answers (Verified Answers) |Already
Graded A+
Who were the key figures in the development of
nuclear magnetic resonance (NMR)?
Felix Bloch and Edward Purcell studied NMR of
water and contributed to the understanding of
nuclear magnetism.
What significant discovery did Raymond Damadian
make regarding malignant tissues?
Damadian discovered that malignant tissues have a
different NMR spectrum than normal tissue,
showing differences in proton density, spin lattice,
relaxation time, and spin-spin relaxation time.
,What imaging method did Paul Lauterbur develop?
Lauterbur developed the first imaging method using
multiple magnetic field gradients, known as
zeugmatography.
What factors control the rotation of the net
magnetization vector in MRI?
The rotation is controlled by the strength of the
radiofrequency (RF) pulse and the duration of the
RF pulse.
What is the role of the magnetic field gradient in
MRI?
The magnetic field gradient spoils the homogeneity
of the magnet and provides spatial localization.
,What is the isocenter in the context of MRI?
The isocenter is the position where the gradient is
zero; moving away from it increases or diminishes
the magnetic field.
How does slice selection work in MRI?
Slice selection is determined by the steepness of
the magnetic field gradient and the bandwidth of
the RF pulse; a steeper gradient and narrower
bandwidth result in thinner slices.
What is bandwidth in MRI, and how does it relate to
the quality of an RF pulse?
Bandwidth is the range of frequencies contained
within the RF pulse; the quality value (Q) of a pulse
, is the center frequency divided by the bandwidth,
with higher Q indicating narrower bandwidth.
What is the effect of a pulsed gradient magnetic
field on net magnetization vectors?
During the pulsed gradient, each voxel's net
magnetization vector precesses at a frequency
determined by its position; when the gradient is
turned off, the vectors return to the same
frequency but retain a phase difference.
What is the purpose of phase encoding in MRI?
Phase encoding selects a particular spatial
frequency in one direction within the selected slice,
allowing for two-dimensional imaging.
