ARRT MRI EXAM, FINAL EXAM, PRACTICE EXAM AND STUDY GUIDE LATEST 2024 ACTUAL EXAM 600 QUESTIONS AND CORRECT DETAILED ANSWERSWITH RATIONALES (VERIFIED ANSWERS) |ALREADY GRADED A+

ARRT MRI EXAM, FINAL EXAM, PRACTICE EXAM

AND STUDY GUIDE LATEST 2024 ACTUAL EXAM 600

QUESTIONS AND CORRECT DETAILED

ANSWERSWITH RATIONALES (VERIFIED ANSWERS)

|ALREADY GRADED A+

ARRT MRI EXAM

The effects of main magnetic field inhomogeneities on the FID

signal are corrected for in a Spin-echo sequence by applying a

second radio-frequency pulse. The flip angle of this radiofrequency pulse is: - ANSWER- 180 degrees

Of the following statements, which describes part of the basic

MR imaging process? - ANSWER- Radio-frequency signals

interact with hydrogen protons

Which type of electromagnetic coils correct inhomogeneities in

the main magnetic field? - ANSWER- Shim coils

Immediately after an initial 90 degree radio-frequency pulse is

turned off, the hydrogen protons will begin to: - ANSWERDephase

Tissues that are very efficient at Spin-lattice interactions near

the Larmor frequency, such as fatty tissues, should have: -

ANSWER- Low T1 values and produces hyperintense signals

T1 is the measurement of time for the longitudinal component of

the net magnetization vector to recover what percentage of its

original value after the application of a 90 degree radiofrequency pulse? - ANSWER- 63%

The tissue characteristic which depends more on the state (solid,

liquid, gas) of a tissue than any other factor is: - ANSWER- T2

effects

The basic process of MR signal generation contains two basic

steps, they are: - ANSWER- Stimulation and relaxation

The T1 Process is also known as: - ANSWER- Spin-Lattice

The T2 process is also known as: - ANSWER- Spin-Spin

Once in the main magnetic field, a majority of hydrogen protons

will align themselves: - ANSWER- Parallel to B0

Magnetic resonance imaging is derived from the process known

as: - ANSWER- Nuclear magnetic resonance

The tissue characteristic that depends heavily on the relative

content of fat molecules and free water is: - ANSWER- T1

effects

Which type of receiver radio-frequency coil is placed close to

the patient's body for the purpose of imaging superficial

anatomic structures? - ANSWER- Surface coils

An equation derived to predict the MR signal intensity of a

particular tissue as a result of a spin-echo pulse sequence is the:

- ANSWER- Larmor equation

Which equation is true of the relaxation process? - ANSWERWithout the effects of T2 star, T2 decay continues

Because of the spinning motion of the hydrogen proton it has the

same properties as a bar magnet. The hydrogen proton's

spinning motion gives it a: - ANSWER- Magnetic moment

On a proton density image, two types of tissue that contain very

low concentrations of hydrogen appear very hypointense are:

(RESEARCH THIS) - ANSWER- Cortical bone and lung

(RESEARCH THIS)

Magnetic susceptibility is defined as: (RESEARCH THIS) -

ANSWER- Tendency of a substance to attract or repel magnetic

lines of force which is decided by the magnetic properties of its

electrons (RESEARCH THIS)

In comparison to computed axial tomography, an advantage of

MR is: - ANSWER- Superior soft-tissue contrast resolution

Fast transition phenomenon and entry phenomenon are theories

that explain which of the following tissue characteristics? -

ANSWER- Velocity effects

In a loop of conductor in which an electric current is introduced

and maintained, a magnetic field will be produced in the center

perpendicular to the flow of electric current. This is called: -

ANSWER- Faraday's Law

Which type of MRI magnet has attainable field strengths of 0.35

Tesla to 3 Tesla for clinical use in the U.S.A, and higher

strengths elsewhere and in research? - ANSWERSuperconcuctive

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