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ARMRIT STUDY GUIDE 2026
COMPREHENSIVE QUESTION–ANSWER
DIGEST
◉ in a large main magnetic field such as those employed in MRI, the motion of a hydrogen proton has been described as wobbling like a spinning top. this motion is called A) precession B) resonance C) frequency D) angular momentum. Answer: precession ◉ magnetic resonance imaging is derived from the process known as: A) magnetic resonance angiography B) magnetic relaxation imaging C) nuclear magnetic resonance D) nuclear resonance imaging. Answer: nuclear magnetic resonance
◉ Once the nmv has moved away from equilibrium, the following will occur A) the longitudinal component will increase B) the transverse component will decrease C) the longitudinal component will stay the same D) the transverse component will increase. Answer: the transverse component will increase ◉ In MR, substances respond to a specific radio frequency which is known as: A) magnetic frequency B) radio frequency C) gyro-magnetic frequency D) resonance frequency. Answer: resonance frequency ◉ the introduction of gadolinium based contrast enhancement agents by intra-venous injection can involve passing through an abnormal blood brain barrier. the tissue compartments involved are the: A) intravascular to interstitial B) extracellular to intracellular C) hepatobiliary to renal
B) larmor equation C) faraday equation D) lauterbur equation. Answer: Larmor equation ◉ in a pulse sequence, transmitting an initial 90 degree radio- frequency pulse will cause the NMV to: A) remain at equilibrium B) shift in both size and direction C) move to antiparallel D) rephase. Answer: shift in both size and direction ◉ Which type of electromagnetic coils are designed to stimulate and detect an MR signal? A) gradient coils B) radio-frequency coils C) shim coils. Answer: radio-frequency ◉ tissues that are less efficient at spin-spin interactions because they contain more free water, such as CSF, should have
A) High T2 values and produce hypointense signals B) HIgh T2 values and produce hyperintense signals C) low T2 values and produce hypointnese signals D) low T2 values and produce hyperintense signal. Answer: High T2 values and produce hyperintense signals ◉ magnetism can be defined as the ability of certain substances to attract: A) Copper, aluminum, tin B) Iron, cobalt, nickel C) Bronze, niobium, titanium D) Neodymium, niobium-titanium, lodestone. Answer: Iron, cobalt, nickel ◉ the purpose of magnetic resonance angiography is to image the: A) stationary soft tissue B) blood flow C) vessel lumen D) only abnormal vessels. Answer: blood flow
Answer: Odd number of total protons and neutrons ◉ A 1.5T magnetic field is equal to: A) 150 gauss B) 1500 gauss C) 15,000 gauss D) 150,000 gauss. Answer: 15,000 gauss ◉ the components of the gyromagnetic ratio are: A) stimulation to relaxation B) protons to electrons C) magnetic moment to angular momentum D) main magnetic field to radio-frequency signal. Answer: magnetic moment to angular momentum ◉ fast transition phenomenon and entry phenomenon are theories that explain which of the following characterisitics: A) T1 effects B) T2 effects C) hydrogen concentration D) veolcity effects.
Answer: Velocity effects ◉ the effects of main magnetic field inhomogeneities on the FID signal are corrected for in the spin echo sequence by applying a second radio frequency pulse. the flip angle of this radio frequency pulse is: A) 45 degrees B) 60 degrees C) 90 degrees D) 180 degrees. Answer: 180 degrees ◉ of the following statements, which describes part of the basic MR imaging process: A) a patient is placed isocenter to ionizing radiation B) the patient is exposed to ionizing radiation C) the generated image contains hypersense and hypodense areas D) radio frequency signals interact with hydrogen protons. Answer: radio frequency signals interact with hydrogen protons ◉ which type of electromagnetic coils correct inhomogeneities in the main magnetic field? A) gradient coils
A) 33%
B) 63%
C) 37%
D) 67%.
Answer: 63% ◉ the tissue characteristic which depends more on the state (solid, liquid, gas) of a tissue than any other factor is: A) T1 effects B) T2 effects C) hydrogen concentration D) velocity effects. Answer: T2 effects ◉ the basic process of MR signal generation contains 2 basic steps, they are: A) parallel alignment and anti-parallel alignment B) stimulation and relaxation C) magnetization and ionization D) magnetization and ionization. Answer: stimulation and relaxation
◉ the T1 process is also known as: A) spin spin B) spin density C) spin lattice D) spin wrap. Answer: spin lattice ◉ the T2 process is also known as: A) spin spin B) spin density C) spin lattice D) spin wrap. Answer: spin spin ◉ once in the main magnetic field, a majority of hydrogen protons will align themselves A) anti-parallel to B B) Orthogonal to B C) Parallel to B D) Randomly to B0. Answer: Parallel to B
Answer: larmor equation ◉ which statement is true of the relaxation process? A) T2* effects slow down T2 decay B) without the effects of T2, T2 decay continues C) T2 effects can not be corrected for D) T2* effects have no effect on T2 decay. Answer: without the effects of T2*, T2 decay continues ◉ because of the spinning motion of the hydrogen proton it has the same properties as a bar magnent. the hydrogen protons spinning motion gives it a A) magnetic charge B) magnetic spin C) magnetic moment D) magnetic precession. Answer: magnetic moment ◉ On a proton density image, 2 types of tissue that contain very low concentrations of hydrogen and appear very hypointense are A) Cerebral tissue and CSF B) fat and muscle
C) medullary bone and kidney D) cortical bone and lung. Answer: cerebral tissue and CSF ◉ in comparison to CT an advantage of MRI is: A) slower scan time B) higher cost of the MRI system C) superior soft tissue contrast resolution D) ionizing radiation. Answer: superior soft tissue contrast resolution ◉ 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 the electric current. this is called: A) Damadian's Law B) Gabillard's Law C) Larmor's Law D) Faraday's Law. Answer: Faraday's Law ◉ which type of MRI magnet has attainable field strengths of 0.35T to 3T for clinical use in the USA and higher strengths elsewhere and in research?
A) vectors B) dipoles C) protons D) axes. Answer: dipoles ◉ at any one time, human body tissue, in general, is made up of 50- 90% of what substance A) c B) NA 23 C) H2O D) H. Answer: H ◉ which of the following is the larmor equation? A) B0 = y + Wo B) B0 = y x Wo C) y = B0 - Wo D) Wo = y x B0. Answer: Wo = y x B ◉ the mechanism of T2 contrast enhancement agents is to
A) increase T2 relaxation time, therefore producing low signal B) decrease T2 relaxation time, therefore producing low singal C) Increase T2 relaxation time, therefore producing high signal D) decrease T2 relaxation time, therefore producing high signal. Answer: Decrease T2 relaxation time, therefore producing low signal ◉ which type of MRi magnet requires cryogen to cool magnetic coils to 4 degrees kelvin? A) superconductive B) resistive C) permanent. Answer: superconductive ◉ a time constant that characterizes the fast rate of transverse magnetization because of the inhomogeneities of the main magnetic field is: A) T2* B) T C) TE D) TR. Answer: T2*
◉ mri systmes require rooms that provide specific shielding requirements. these rooms are lined with what typer of material? A) stainless steel or titanium B) copper or galvanized steel C) lead D) iron oxide or neodymium. Answer: copper or galvanized steel ◉ which type of MRI magnet requires no electricity to maintain its magnetic field and can weigh from 18,000 to 200,000 lb.? A) superconductive B) resistive C) permanent. Answer: permanent ◉ which type of electromagnetic coils are employed as a transmitter, receiver, or both? A) gradient coils B) radio frequency coils C) shim coils. Answer: radio frequency coils
◉ which type of MRI magnet requires a special cooling system to dissipate heat produced by very large currents? A) superconductive B) resistive C) permanent. Answer: resistive ◉ tissues that are efficient in both T1 an T2 interactions have low (short) relaxation times, and therefore have: A) high T1 values B) high relaxation rates C) high T2 values D) low relaxation rate. Answer: high relaxation rates ◉ because of only 10-15% variation in most tissues, the tissue characteristic that does not provide much contrast resolution is: A) T1 effects B) T2 effects C) hydrogen concentration D) velocity effects.
