Armrit stuvia - Study guides, Class notes & Summaries

Chemical pre saturation - ANSWER-Selectively apply 90 degree pulse at frequency of tissue to be saturated. Moves fat or HBO 90 degrees. 2nd puse wider bandwidth moves both fat and water 90 degrees. One will be saturated so will not be read. Saturating out normal anatomy, pathology is often seen more clearly. NEX number of excitations - ANSWER-is the number of times each line is filled with the data in K space, the number of times and echo is encoded with the same slope of phase encoding gradi...

The 2 types of enhancement media described by Lauffer, the mechanism of T1 agents is - Answer to decrease T1 relaxation time, thus emitting high signal An analogy for the decoding of the MR signal through Fourier Transform - Answer Basilar membrane processing sound Logically each line of phase encoding data is combined to allow the FT to determine the position along the y-axis. The number of phase encoding steps determines - Answer the number of pixels along the y-axis In a gradient ech...

ARMRIT PHYSICS PRACTICE TEST WITH COMPLETE SOLUTIONS ARMRIT PHYSICS PRACTICE TEST WITH COMPLETE SOLUTIONS ARMRIT PHYSICS PRACTICE TEST WITH COMPLETE SOLUTIONS The tissue characteristic that depends heavily on the relative content of fat molecules and free water is: - ANSWER-Hydrogen concentration. T1 is the measurement of time for the longitudinal component of the net magnetization vector to recover what percentage of its original value after the application of a 90 degree radio...

Orbital screening for suspected intraocular metallic bodies should be done prior to admitting patients and personnel into an MR system: - ANSWER-at or above 0.01 Tesla strength Patients with tattooed eyeliner and / or eye makeup containing ferrous pigment should be screened and advised of what possible complication of MR imaging? - ANSWER-transient skin irritation or cutaneous swelling of the eyes and surrounding tissues Pregnant MR technologists should be restricted from entry into the el...

ARMRIT-Practice Test (Part 2: Mri Clinical Applications) with Complete SolutionsARMRIT-Practice Test (Part 2: Mri Clinical Applications) with Complete SolutionsARMRIT-Practice Test (Part 2: Mri Clinical Applications) with Complete Solutions Tissues that have low (short) relaxation times have: - ANSWER-High (long) relaxation rates Spatial resolution is an image quality factor determined by ________ and ________. - ANSWER-Slice thickness and pixel size Inversion time, In an inversion reco...

ARMRIT Practice Test (MRI Technologist Quick Reference and Study Guide ARMRIT) with Complete SolutionsARMRIT Practice Test (MRI Technologist Quick Reference and Study Guide ARMRIT) with Complete SolutionsARMRIT Practice Test (MRI Technologist Quick Reference and Study Guide ARMRIT) with Complete Solutions Magnetism can be defined as the ability of certain substances to attract: - ANSWER-Iron, Cobalt, Nickel The components of the Gyro-magnetic ratio are: - ANSWER-Magnetic moment to angula...

For the following spin-echo protocol: FOV: 320/ TR:500/ TE:25/ SliceThick.:5mm/ Slice Gap:1mm/ Slice.#:9/ NEX:4, Matrix:192 Increasing the FOV will: a. Increase SNR. b. Decrease SNR. c. Decrease Matrix. - ANSWER-a. Increase SNR A gradient is employed exposing the patient's body to a series of increasing or decreasing magnetic field strengths for slice selection. In what relation to the slice is this gradient? a. Anti-parallel. b. Perpendicular. c. Parallel. d. Oblique. - ANSWER-b. P...

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Practice Test 1 ARMRIT with Complete Solutions Practice Test 1 ARMRIT with Complete Solutions Practice Test 1 ARMRIT with Complete Solutions Practice Test 1 ARMRIT with Complete Solutions different tissues that have signals that appear similar on a mr image are described as: - ANSWER-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: - ANSWER-Prescessi...

Tissues that have low (short) relaxation times have: - ANSWER-High (long) relaxation rates Spatial resolution is an image quality factor determined by ________ and ________. - ANSWER-Slice thickness and pixel size Inversion time, In an inversion recovery pulse sequence, is the time interval between the: - ANSWER-180 and 90 degree pulses A complicated equation for predicting the MR signal intensity from a tissue subject to a spin-echo sequence is the: - ANSWER-Bloch Equation In a grad...