ARMRIT Practice Exam Questions With Verified Answers

Nuclear magnetic resonance. - Answer Magnetic Resonance Imaging is derived from the process known as: Magnetic field, proton, radio-wave - Answer On a very basic level, the three basic components required to attain MR signals are: Superior soft-tissue contrast resolution. - Answer In comparison to Computed Axial Tomography, an advantage of MRI is: Special and costly site planning and shielding. - Answer In comparison to Computed Axial Tomography, a disadvantage of MRI is: Iron, cobalt, nickel. - Answer Magnetism can be defined as the ability of certain substances to attract: Field or flux - Answer To symbolize the flow and area of a magnetic field, lines are used which are called: Dipoles. - Answer Magnetic fields have direction which are usually designated as north and south, therefore magnetic fields are described as: Vector. - Answer Magnetic fields have strength and direction, which are represented by a: Faraday's Law - Answer 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: Tesla. - Answer The strength of very large magnetic fields like those employed in MRI systems, the SI unit most commonly used is: 15,000 gauss - Answer A 1.5 Tesla magnetic field is equal to: 0.06 Tesla to 3 Tesla - Answer In the USA, MRI systems in clinical use have main magnetic field strengths that range from: Homogeneity. - Answer To describe the uniformity of the MRI system's main magnetic field, the term employed is: B0 - Answer In the USA, the MRI system's main magnetic field and the vector that represents it is symbolized: 20-30 PPM. - Answer The main magnetic field of MRI systems in clinical use must meet an acceptable specification of: H2O - Answer At any one time, human body tissue, in general, is made up of 50 - 90% of what substance? Odd number of total protons and neutrons. - Answer In MR imaging, for a chemical substance to be affected by the main magnetic field and the radio-wave it must contain an: H - Answer In clinical MR imaging of the human body, the substance of interest is: Magnetic moment - Answer 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: Resonance frequency - Answer In MRI, substances respond to a specific radio frequency which is known as: Larmor equation - Answer The resonance frequency of any substance in a magnetic field can be calculated by employing the: Gyro-magnetic ratio - Answer All chemical substances have an assigned constant known as the: wo = y x Bo - Answer Which of the following is the Larmor equation? Wavelength and frequency - Answer A sinewave is a symbol used to measure electromagnetic energy. A sinewave's two components of measurement are: