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short TR

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how does Mz achieve successive & smaller intensity FID 

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true

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Mxy is the only component responsible for MR signal 

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nuclei (all)

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what forms the net magnetization vector ?

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correct

T1

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Obtained by manipulating TR of regular spin echo pulses

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Long value TE and TR

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Correct

Bright

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Voxels with high hydrogen concentration or proton density appear?

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Correct:

Pulse sequence

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Grouping two or more RF pulses is called a 

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hydrogen nuclei

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The MRI signal amplitude is dependent on what factor ? 

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Correct:

Free induction decay

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Decreased MR signal received after RF pulse is called

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Correct:

Stronger MR signal

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window width; AEC controller

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contrast in MRI images is controlled by all of the following EXCEPT

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bright

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T1 weighted images tissue with short T1 will appear __

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three

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inversion recovery (IR) uses ___ RF pulses

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true

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Frequency depends on the type of nucleus and intensity of the external magnetic field

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spin

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obtained by manipulating TR of regular spin echo pulses

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Time from the start of one pulse sequence to
the start of the next pulse sequence,

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Spin echo sequences with short TR and ___ ____.

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Correct: false

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True or false: Bone appears white because it is totally dephased before the receiver turns on

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The time between the initial 90 degree RF pulse and the SE is called the ____

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True or false: Large M0 equals stronger MRI signal

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Every nucleus has a quantity called a ____ state. 

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Answer #4

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Where does spin ensemble begin for T2-weighted images?

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Answer #2

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All of the following are the principal parameters of MRI except…

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Answer #3

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Answer #4

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What is representative of the product of RF pulse intensity and duration? (hard RF pulse)

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Answer #3

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What object is used to represent the spinning of a nucleus when a magnetic field is applied to it

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The correct answer is T1 weighted images 

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What image type is obtained by manipulating the TR of regular spin echo pulses? 

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After approximately 5 T1 relaxation times 

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After approximately 5 T1 relaxation times

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Which of the following is NOT an RF pulse used in inversion recovery (IR)?

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180 degree RF pulse before a 90 degree RF pulse 

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SEs created by adding 180 degree RF pulses 

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Correct answer: B. rephase and creates an echo

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True or False: T2 relaxation never exceeds T1 relaxation time for bone. 

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During inversion recovery, spin echos (SEs) are created by adding ___________ RF pulses: 

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Strong, very short RF pulses are referred to as: 

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As the nucleus enters an external magnetic field, it prefers to be in a __________________ energy state. 

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To maximize effect of ____ on contrast, TE and TR should be set to a ____ value

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T2 weighted images – tissue with long T2 appears ____, short T2 appears ____

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Time from the start of one pulse sequence to the start of the next pulse sequence

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True or False? Large M0 means weaker MRI signal

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What describes behavior of very small objects, like x-rays, protons, neutrons, and electrons

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C is the answer

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What is NOT true regarding the following? 

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Causes spins to rephrase and created an echo

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Second half of echo is mirror image of the first half 

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Causes spins to rephrase and create an pulse 

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Proton density

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What is the concentration of mobile hydrogen nuclei available to produce an MR image? 

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A is correct

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A is correct

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Nuclear magnetism

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For a signal to be received, the magnetization vector must be rotated from the ___________.

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What model describes a charged particle rotating around its own axis with angular momentum?

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Commonly produced using spin echo and fast spin echo pulse sequences

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Voxels with high hydrogen concentration or proton density appear ___

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What causes Mz to not have related equilibrium, so spins are partially saturated which results in smaller intensity FID for second and successive FIDs

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Both A and B

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Create brighter area in T1 weighted images

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Create brighter area in T2 weighted images 

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Decreasing MR signal received after RF pulse is called____

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63% M0

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Ever nucleus has a quantity called a ____

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pulse sequence

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Grouping of two or more RF pulses is called a 

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Nuclear magnetism

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Both A and B

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all of the above

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What parameters can influence contrast? 

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longitudinal and spin lattice relaxation time

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Three Pulse

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Decreasing

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Decreasing MR signal received after RF pulse 

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Increasing MR signal received after RF pulse

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MRI properties of that atom

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_______________ events occurring along the axis of the net magnetization vector (parallel to B0)

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Grouping of two or more RF pulses is called a____________

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State of net magnetization is called _________

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______________ of the MR signal is related to value of M0

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Spin echo first (FID) increases in intensity to a maximum, then relaxes to zero

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More than one but not all (longitudinal relaxation time and spin-lattice relaxation time)

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Which of the following would NOT affect contrast?

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MRI signal has what kind of relationship to proton density and B0?

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When the second and successive FIDs equals the amplitude of the first FID, the TR is

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At equilibrium, what kind of signal is received from the patient?

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The MRI properties of an atom are referred to as

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correct answer: true

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Shorter the TR or greater the TE, poorer signal-to-noise ratio

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correct answer: true

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Bone appears black because it is totally dephased before the receiver turns on

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correct answer: B

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Three RF pulses used and the time between pulses is less than T2, called

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correct answer: A

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Strength of the signal is proportional to size of 

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correct answer: A

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Spinning charged mass induces a magnetic field around itself – field is called 

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What increases the intensity to a maximum and then relaxes to zero?

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In MRI, images are are identified by what?

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When an echo signal of the FID can be generated, this is known as :

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b. the intensity of external magnetic field

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1. __________ a quantity that has direction.

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______ is a quantity that has direction. 

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How many RF pulse does inversion recovery uses?

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Free induction decay is decreasing MR signal received after RF pulse. 

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Which of the following controls the T2 dependence of gradient echo pulse sequences?

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True or False: T2 measured combines real T2 of tissue and magnetic field inhomogeneity.

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In a T2-weighted image, which type of tissue would appear dark?

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Which of the following parameters of MRI does not control image contrast?

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what is time from the start of one pulse sequence to the start of the next pulse sequence

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What happens to nuclei when they are subjected to a strong external magnetic field?

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longitudinal