ARMRIT PRACTICE EXAM STUDY QUESTIONS AND ANSWERS 2024

Originally, Magnetic Resonance Imaging was known by the name: - Nuclear magnetic reconance Three components necessary for MRI on a very basic level are: - Magnetic, nuclei, radiowave An advantage of MRI over Computed Tomography (CT) is: - Superior soft tissue contrast (resolution) A disadvantage of MRI compared to CT is: - Special (costly) site planning and shielding Magnetism is described as the ability of certain material to attract: - Iron, cobalt, nickel When symbolizing the flow and area of a magnetic field, special lines are used, they are called: - Field or flux The magnetic field of any magnetic has a direction, signified north and south. This property of a magnet makes it a: - Dipole A symbol to describe the direction and strength of a magnetic field is called: - Vector The law; In a loop of conductor where and electric current is introduced and maintained, a magnetic field will be produced in the center. Is attributed to: - Faraday When describing the strength of an MRI main magnetic field, the SI unit most commonly used is: - Tesla One tesla is equal to: - 10,000 gauss MRI magnets in clinical use today range in field strength from: - .035T to 3T The term used to describe Magnetic uniformity in the static (main) Magnetic field is: - Homogeneity The symbol used to describe the static (main) Magnetic field and its vector is: - B0 The specification that is acceptable for field homogeneity of an MRI magnet for clinical scanning is: - 20-30ppm The human body is made up of 50-90% ---- at any one time: - H20 For a chemical substance to be affected by the magnet and radiowave in MRI scanning it must have: - Odd # of protons and neutrons When imaging the human body for clinical purposes in MRI, we are only interested in: - H1 Due to its spin, the H nuclei's proton has the same properties as a Bar magnet. This spinning motions gives the H proton a: - Magnetic moment All substances will respond to a certain frequency. In MRI we call this the: - Resonance frequency You calculate the resonance frequency of any substance in a magnetic field employing the: - Larmor equation The constant assigned to each chemical substance, used to measure the resonance frequency is the: - Gyro-magnetic ratio All chemical substances have an assigned constant known as the: - Gyro-magnetic ratio The Larmor equation is: - Wo=YxB0