ARMRIT Practice Test Exam With 100% Correct Answers 2024, Exams of Advanced Education

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ARMRIT Practice Test Exam With 100%

Correct Answers 2024

Magnetism can be defined as the ability of certain substances to attract: - Correct Answer-Iron, Cobalt, Nickel The components of the Gyro-magnetic ratio are: - Correct Answer-Magnetic moment to angular momentum Which type of electromagnetic coils produce smaller magnetic field which allow spatial localization to be performed? - Correct Answer-Gradient coils Which type of MRI magnet requires cryogen to cool magnetic coils to 4 degrees Kelvin? - Correct Answer-Superconductive T2 is the measurement of time for the transverse component of the net magnetization vector to decrease what percentage of its maximum value after the application of a 90 degree radio frequency pulse: - Correct Answer-37% Which cryogenic material can produce temperature as low as 4 degrees Kelvin? - Correct Answer-Liquid Helium

The T1 process is also known as - Correct Answer-Spin-Lattice a 90 degree radio-frequency pulse will alter the net magnetization vector. Another effect is: - Correct Answer-The hydrogen protons will have phase coherence. Which type of MRI magnet requires no electricity to maintain its magnetic field and can weigh from 18,000 lb. to 200, lb.? - Correct Answer-Permanent To describe the uniformity of the MRI system's main magnetic field, the term employed is - Correct Answer-Homogeneity The purpose of magnetic resonance angiography is to image the - Correct Answer-Blood Flow Magnetic Resonance Imaging is derived from the process known as: - Correct Answer-Nuclear Magnetic resonance 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: - Correct Answer-Intravascular to interstitial In a pulse sequence, transmitting an initial 90 degree radio- frequency pulse will cause the net magnetization vector to: - Correct Answer-Shift in both size and direction. Which statement is true of the relaxation process? - Correct Answer-Without the effects of T2 star, T2 decay continues. Which molecule precesses closer to the Larmor frequency? - Correct Answer-Fat 1 milliliter of H2O contains how many hydrogen protons - Correct Answer-6 times 10 ^ An equation derived to predict the MR signal intensity of a particular tissue as the result of a Spin-echo pulse sequence is the: - Correct Answer-Bloch equation Which type of MRI magnet requires a steady current of electricity in coils of conductor wrapped around an air or iron core? - Correct Answer-resistive

What is the gyro-magnetic ratio of hydrogen? - Correct Answer-42.58 MHz Of the following statements, which describes part of the basic MR imaging process? - Correct Answer-Radio-frequency signals interact with hydrogen protons. 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? - Correct Answer- Superconductive The mechanism of T2 contrast enhancement agents is to - Correct Answer-decrease T2 relaxation time, therefore producing low signal. 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: - Correct Answer-180 degrees

Which type of electromagnetic coils can be found both inside and outside of the housing of the MRI magnet? - Correct Answer-radio-frequency coils At any one time, human body tissue, in general, is made up of 50-90 percent of what substance? - Correct Answer-H2O In comparison to Computed Axial Tomography, an advantage of MRI is - Correct Answer-Superior soft-tissue contrast resolution In MRI, substances respond to a specific radio frequency which is known as: - Correct Answer-Resonance frequency In the USA, MRI systems in clinical use have main magnetic field strengths that range from: - Correct Answer-0.06 Tesla to 3 Tesla Magnetic fields have strength and direction, which are represented by a: - Correct Answer-Vector