Download ARMRIT ACTUAL SCRIPT 2026 WITH VERIFIED SOLUTIONS and more Exams Magnetic Resonance Imaging (MRI) in PDF only on Docsity!
ARMRIT ACTUAL SCRIPT 2026 WITH
VERIFIED SOLUTIONS
โ The components of the Gyro-magnetic ratio are: Answer: Magnetic moment to angular momentum โ Which type of electromagnetic coils produce smaller magnetic field which allow spatial localization to be performed? Answer: Gradient coils โ Which type of MRI magnet requires cryogen to cool magnetic coils to 4 degrees Kelvin? Answer: Superconductive โ 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: Answer: 37% โ Which cryogenic material can produce temperature as low as 4 degrees Kelvin?
Answer: Liquid Helium โ The T1 process is also known as Answer: Spin-Lattice โ a 90 degree radio-frequency pulse will alter the net magnetization vector. Another effect is: Answer: The hydrogen protons will have phase coherence. โ Which type of MRI magnet requires no electricity to maintain its magnetic field and can weigh from 18,000 lb. to 200,000 lb.? Answer: Permanent โ To describe the uniformity of the MRI system's main magnetic field, the term employed is Answer: Homogeneity โ The purpose of magnetic resonance angiography is to image the Answer: Blood Flow โ Magnetic Resonance Imaging is derived from the process known as: Answer: Nuclear Magnetic resonance
โ Which type of MRI magnet requires a steady current of electricity in coils of conductor wrapped around an air or iron core? Answer: resistive โ What is the gyro-magnetic ratio of hydrogen? Answer: 42.58 MHz โ Of the following statements, which describes part of the basic MR imaging process? Answer: Radio-frequency signals interact with hydrogen protons. โ Which type of MRI magnet has attainable field strengths of 0. Tesla to 3 Tesla for clinical use in the U.S.A, and higher strengths elsewhere and in research? Answer: Superconductive โ The mechanism of T2 contrast enhancement agents is to Answer: decrease T2 relaxation time, therefore producing low signal. โ 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 โ Which type of electromagnetic coils can be found both inside and outside of the housing of the MRI magnet? Answer: radio-frequency coils โ At any one time, human body tissue, in general, is made up of 50- 90 percent of what substance? Answer: H2O โ In comparison to Computed Axial Tomography, an advantage of MRI is Answer: Superior soft-tissue contrast resolution โ In MRI, substances respond to a specific radio frequency which is known as: Answer: Resonance frequency โ In the USA, MRI systems in clinical use have main magnetic field strengths that range from: Answer: 0.06 Tesla to 3 Tesla
