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Official ARMRIT Study Guide #1 Questions with Solutions
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Official ARMRIT Study Guide #1
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Official ARMRIT Study Guide #1What is an Atom? - answer ATOMS - fundamental submicroscopic unit of all mass
What is the lightest Atom ? - answer Hydrogen
what is a proton? - answer A subatomic particle having a positive charge identical in
magnitude to the negative charge of an electron and, together with the neutron a
component of all atomic nuclei.
The proton has a what? - answer The proton has an intrinsic angular momentum or spin
and thus magnetic moment (very small magnetic field)
What determines what an element is? - answer the number of protons in an atom
The atomic number of an element denotes the number of protons in what ? - answer
The nucleus
What is an electron? - answer A subatomic particle that, along with protons and
neutrons, make up atoms. The flow of an electric current in a conductor is cause by
drifting of free electrons in the conductor.
What is the charge of an electron? - answer The basic unit of electricity
what is a spin? - answerIs a property of a subatomic particles that indicates the particles
angular momentum.
What is a neutron? - answersubatomic particle with no charge
The net charge of a neutron is what? - answerZero
Describe magnetism - answerThe ability of a substance to attract iron, cobalt, and
nickel.
what is a dipole? - answerA magnetic field characterized by its own magnetic north and
south poles separated by a finite distance.
Define magnetic susceptibility? - answerThe tendency of a substance to attract and
repel magnetic lines of force dependent on the magnetic properties of its electrons.
what are the four categories of magnetic susceptibility? - answer1) diamagnetic
, 2) paramagnetic
3) super- paramagnetic
4) ferromagnetic
explain diamagnetic - answerThe property is most substances with paired orbital
electrons that have opposite spinning, and their magnetic moments cancel each other
out.
Explain paramagnetic - answerThe property of most substances with positive magnetic
susceptibility that attract and repeat magnetic lines of force. These substances
(gadolinium, methemoglobin, free radicals) contain one or more unpaired orbital
electrons and produce marked reductions in the T1 and T2 relaxation times.
what are unpaired orbital electrons? - answerUnpaired orbital electrons spin spin in the
same direction and have a tendency ti line up with the magnetic field, therefore
producing additional magnetic fields.
explain super- paramagnetic - answerThe property of substances with large positive
magnetic susceptibility which strongly attract or repel magnetic lines of force
superparamagnetic materials do not exhibit residual magnetism when the .... -
answerExternal field is removed
explain ferromagnetic - answerThe property of substances with large positive magnetic
susceptibility that become magnetized within a magnetic field and remain magnetized
after being removed from the magnetic field
what is a magnetic field? - answerA vector quantity consisting both a north and South
Pole; it exerts an induction force in ferromagnetic and paramagnetic substances.
explain what field and flux lines are used for - answerMeasure the flow and area of a
magnetic field.
explain isocenter - answerArea of the magnetic field where the field strength is the
greatest, in MRI at he center of the scan area.
what are fringe fields? - answerWeaker magnetic fields that are away from the
isocenter, in MRI outside the scanning area.
what is a flux? - answerFlow of energy; magnetic field flowing from north to south poles
represented by magnetic lines of force.
explain force - answerThe ability to create work or change (measured in horsepower).
what is commonly used in tesla? - answerDescribing the strength of an MRI main
magnetic field, the SI unit most commonly used in Tesla.
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