ARRT MRI FINAL EXAM PRACTICE

ARRT MRI FINAL EXAM PRACTICE

EXAM WITH 400 QUESTIONS AND 100%

CORRECT ANSWERS/ ARRT MRI ACTUAL

FINAL EXAM QUESTIONS BANK WITH

ANSWERS (GUARANTEED A+)

Magnetic resonance imaging is derived from the process known as... - ANSWER- Nuclear magnetic resonance

Which of the following statements is true for gadolinium MRI IV enhancement products? - ANSWER-B) produces randomly fluctuating magnetic fields in its immediate enviroment.

The maximum exposure to radiofrequency in 1 gram of tissue is: - ANSWER-D) a

maximum spatial peak of 8 w/kg

Currently, patients & personnel are excluded from exposure to MRI for the 1st trimester of pregnancy. - ANSWER-True

The maximum exposure to radio frequency averaged over the head is: - ANSWER-

B)No more than 3.2 w/kg

The recieve signal amplitude for a pixel usually depends on the substance's... - ANSWER-A) T1, T2 , proton density

Small magnetic field introduced to the hydrogen protons in order to cause them to move from the low energy state to the high energy state is... - ANSWER-C) RF pulse 1 / 4

at any one time, human body tissue, in general, is made up of 50%-90% of what substance? - ANSWER-Hydrogen.

once the patient's area of interest is placed in the main magnetic field of the MRI system, the hydrogen protons will... - ANSWER-precess parallel to B sub zero

In most tissues hydrogen concentration varies - ANSWER-10%- to 15%

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 radio frequency pulse? - ANSWER-63%

The NMV is rotated to the physical negative Z axis by applying a...? - ANSWER- C)180 pulse

Increasing which parameter is considered the "best" technique for improving image quality? - ANSWER-C)NEX

Studies have concluded that static magnetic fields up to what tesla produce no substantial harmful biological effects. - ANSWER-C)2.0

Tissues that have low (short) relaxation times have: - ANSWER-Higher relaxation

rates

Nuclei in their natural environment ( in the absence of a significant magnetic field) are aligned... - ANSWER-Randomly

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Following the injection of a gadolinium enhancement agent, the pulse sequence most commonly employed is a... - ANSWER-C)T1 weighted

Employing a pulse sequence with a long TR & a long TE will result in tissues with a short T2 value appearing WHAT & tissues with a long T2 appearing WHAT on the resultant image. - ANSWER-D)Dark/bright

Which gradient axis direction is typically (for educational purposes) designated as the slice selection gradient? - ANSWER-C)Logical Z gradient

Electromagnetic coils placed strategically to contain the fringe fields. - ANSWER- 2)Active shielding

• milliliter of H2O contains how many hydrogen protons? - ANSWER-6 ×10 to th

23power

because of the spinning motion of the hydrogen proton, it has the same properties as a bar magnet. the hydrogen proton spinning motion gives it a... - ANSWER- magnetic moment

normally enhancing structures post gadolinium - ANSWER-choroid plexus

because of only a 10% to 15% variation in most tissues, the tissue character that does not provide much contrast resolution... - ANSWER-hydrogen concentration

An inversion recovery pulse sequence can be which of the following? - ANSWER- ACC

RF. 3 / 4

average over the whole body is answer 1.averaged over the head is answer 2.in one gram (1gr) of tissue is answer 3. - ANSWER-1.C) no more than 0.4 w/kg 2.A) no more than 3.2w/kg 3.B) maximum spatial peak if 8 w/kg

on T1 weighted images sub-acute hemorrhage will appear bright? - ANSWER- TRUE

which characteristic of tissue, in MRI, is the result of fast transition phenomenon &/or entry phenomenon? - ANSWER-flow/velocity effects

radio frequency RF coils that are placed close to the patient's body specifically for structures that are superficial & are receive coils only are... - ANSWER-surface coils

chemical shift artifacts will show up on the image in what gradient direction? - ANSWER-B) frequency encoding

coils that superimpose small magnetic fields within the patient during the MRI process & allow for special encoding are... - ANSWER-gradient coils

In an Inversion Recovery pulse sequence what TI will produce STIR fat- suppressed pulse sequence? - ANSWER-80-120

The Larmor precessional or resonance frequency of hydrogen protons in a static magnetic field of 0.5 is approximately... - ANSWER-21.288 MHz

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