What is the nex - Study guides, Class notes & Summaries

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...

For the following spin-echo protocol: FOV: 320/ TR:500/ TE:25/ SliceThick.:5mm/ Slice Gap:1mm/ Slice.#:9/ NEX:4, Matrix:192 Decreasing TE will: a. Decrease the # of allowable slices. b. Increase the # of allowable slices. c. Increase scan time. d. Decrease scan time. - Answer-b. Increase the # of allowable slices. A linear relationship between frequency and position is superimposed on Bo by the Gp. The H protons' relative precessional frequencies determine: a. Phase coherence. b. Phas...

GCSE COMBINED SCIENCE: SYNERGY F Foundation TierPaper 4 Physical Sciences Tuesday 13 June 2023Morning Time allowed: 1 hour 45 minutes Materials For this paper you must have: a ruler a protractor a scientific calculator the periodic table (enclosed) the Physics Equations Sheet (enclosed). Instructions Use black ink or black ball-point pen. Pencil should only be used for drawing. Fill in the boxes at the top of this page. Answer all questions in the spaces provided. Do not write out...

Phase mismapping: Appearance - correct answer -AKA ghosting. produces replications of moving anatomy across the image in the phase direction. Usually occurs from anatomy that moves periodically (respirations, blood flow, swallowing, eye movement). Is phase mismapping/ghosting more or less apparent further from the source? - correct answer -Less apparent. What is the calculation for separation between ghosts? - correct answer -S(p)= scan time (TR, phase matrix, NEX) divided by the p...

CAMRT-MRI In Practice chapter 8 Artifacts Exam Questions With 100% Accurate Answers Rated A+| newest Version 2024 Phase mismapping: Appearance - ACCURATE ANSWER-AKA ghosting. produces replications of moving anatomy across the image in the phase direction. Usually occurs from anatomy that moves periodically (respirations, blood flow, swallowing, eye movement). Is phase mismapping/ghosting more or less apparent further from the source? - ACCURATE ANSWER-Less apparent. What is the ...

Hematological and Immune Problems- Chapter 18-Dunphy Exam Questions and Answers 100% Pass Mrs. Jameson complains of unilateral blurry vision and partial blindness in the left eye. On PE, you find decreased peripheral vision on her left side. Funduscopic examination reveals cotton-wool spots. Your most likely diagnosis is A. cryptococcosis B. toxoplasmosis C. cytomegalovirus infection D. herpes simplex virus infection - Correct Answer ️️ -C Sickle cell anemia affects African America...

T2 is the measurement of time from the transverse component of the NMV to decrease what percentage of its max value after the application of a 90 degree RF pulse - 37% combining a metal ion with a ligand reduces their tendency to bind proteins, enzymes, or membranes, the degree to which they disassociate is a measure of: - toxicity 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 ...

4 image considerations of image quality SNR CNR SR Scan time Which extrinsic factor will have greatest affect of SNR Coil type Which type of tissue will produce lowest SNR Muscle White matter Gray matter Cortical bone Cortical bone A coarse matrix will have High # of freq/phase Low # of freq/phase Large pixels High SNR High # of freq/phases Doubling slice thickness will increase or decrease SNR? Increase SNR Increasing TR will decrease or increa...

When doing a study on a patient's knee you notice that the image is fuzzy (TOO MUCH PARTIAL VOLUME AVERAGING). Which of the following changes would improve your image the most when repeating the sequence? correct answersDecreasing the thickness 1/2 mm If we have a voxel of .78mm x .78mm x .1mm, we would have an anisotropic voxel? correct answersTrue If you change the NEX from 2 to 4, what is the resulting scan time change? correct answers2x Which of these is NOT a consequence of decrea...

Assuming all other parameters are the same, an echo time of _________ ms provides the best Signal-to-Noise Ratio. correct answers15 Fat has a ______ T1 relaxation time and a ____ T2 relaxation time correct answersShort and Short Water has a ____ T1 relaxation time and a ____ T2 relaxation time correct answersLong and Long If the repetition time is doubled, the scan time will correct answersDouble: TR is directly porpotional to scan time (TR x Phase Matrix x NEX) Which of the followin...