ARRT MRI EXAM, FINAL EXAM, PRACTICE EXAM AND STUDY GUIDE LATEST 202 4 ACTUAL EXAM 600 QUESTIONS AND CORRECT DETAILED ANS WERS WITH 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 radio -
frequency 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: - ANSWER - Dephase 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 radio -
frequency 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? - ANSWER - Without 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? - ANSWER - Superconcuctive
frequency 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: - ANSWER - Dephase 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 radio -
frequency 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? - ANSWER - Without 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? - ANSWER - Superconcuctive
