Larmor frequency Samenvattingen, Aantekeningen en Examens

MRSO Mock Test 1 - Questions with 100% Correct Answers Which of the following describes when a non-ferrous, electrically conductive object is repulsed by a static magnetic field? A. Fourier Transfomation B. Larmor equation C. Lenz force D. Ohms law What is the purpose of resonance? A. Resonance is not used in MRI B. To tilt the nuclei of interest away from B0 C. To slow down the processional frequency or nuclei D. To align nuclei with B0 Induction of electrical current in our patient from chan...

ASRT test questions on all 12 modules with veried questions & 100 % correct answers already graded A+ The most common type of magnet used in today's MR systems is the _______________. A. resistive magnet B. permanent magnet C. superconducting magnet D. open MR scanner - ANSWER>>>>C. superconducting magnet The positively charged part of an atom is the _____________. A. electron B. neutron C. proton D. nucleus - ANSWER>>>>C. proton When a hydrogen nucleus is p...

Electromagnetic energy is symbolized by a sine wave that has two components of measurements, they are: - Answer-Wavelength and frequency Of the following techniques which one is applied to prevent "crosstalk" between multi-slices with little or no interslice "gap" - Answer-Interleaving The artifact known as aliasing, wrap around or fold over will always show up in what gradient direction? - Answer-Phase encoding Which of the following causes of artifacts on MR images is most commonly m...

What is graphically displayed on the nuclear magnetic resonance spectrum? - ANSWER-Frequency distribution of the different radio-frequencies emitted by the patient. At a given magnetic field strength, each nuclide in the periodic table has a unique _____________. - ANSWER-Resonate frequency In clinical nuclear magnetic resonance imaging, which nuclide is most commonly used? - ANSWER-Hydrogen The time required for molecules to diffuse from one medium to another is expressed by the coeffi...

Electromagnetic energy is symbolized by a sine wave that has two components of measurements, they are: - Answer Wavelength and frequency Of the following techniques which one is applied to prevent "crosstalk" between multi-slices with little or no interslice "gap" - Answer Interleaving The artifact known as aliasing, wrap around or fold over will always show up in what gradient direction? - Answer Phase encoding Which of the following causes of artifacts on MR images is most commonl...

The NMV is rotated to the physical negative Z axis by applying a...? - C)180 pulse Increasing which parameter is considered the "best" technique for improving image quality? - C)NEX Studies have concluded that static magnetic fields up to what tesla produce no substantial harmful biological effects. - C)2.0 Tissues that have low (short) relaxation times have: - Higher relaxation rates Nuclei in their natural enviroment ( in the absence of a significant magnetic field) are aligned... - Ra...

An RF pulse of what flip angle will maximize the component of the net magnetization projected into the transverse plane? a. 180 b. 120 c. 90 d. 45 c. T1 relaxation refers to ____ relaxation. a. spin-spin b. longitudinal c. phase d. transverse b. Which of the following statements is false? a. T1 relaxation refers to longitudinal recovery of magnetization while T2 relaxation refers to the transverse decay of magnetization b. T1 relaxation and T2 relaxation occur sim...

practice test 1 armrit questions and answers different tissues that have signals that appear similar on a mr image are described as: - Ans ️️ - isointense In a large main magnetic field such as those employed in MRI, the motion of a hydrogen proton has been described as wobbling like a spinning top. This motion is called: - Ans ️️ -Prescession Magnetic resonance imaging is derived from the process known as: - Ans ️️ -Nuclear magnetic resonance Once the net magnetization vector...

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, cobal...

niobium-titanium - ANSWER-Most commonly used conductor wires. Has critical temperature of 10K (-442F). Liquid Helium is used to cool the wires - cooled to 4K. Field Map - ANSWER-Shows field strength. Greatest at isocenter. 5G Line - ANSWER-0.5 mT. Must be in an area of controlled access. May not be in Zone IV. Spatial Gradient Map - ANSWER-Shows change in field strength over distance (dB/dx) Shielding - ANSWER-Passive: Metal (usually iron) in walls. Active: additional coils i...