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40 Cards in this Set
- Front
- Back
final result of a perfusion study is..? |
Set of calculated images which indicates various flow. |
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dynamic enhanced MRA of mesenteric arteires are performed using..? |
Incoherent |
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Contrast in DWI imaging depends on..? |
Degree of molecular mobility is impaired Sensibility to Bronwian motion Direction of water diffusion |
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2003 FDA RF absorption to the head to..? |
3.0 w/kg for 10 min. |
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If TR in GRE echo is less than T2 this is a..? |
Steady state |
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FSE #of shots is..? |
Phase encoding/ ETL |
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Islet tumor is found in the..? |
Pancreas |
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Structures comprises rotator cuff..? |
subcap, infra, supra, and teres |
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Phagocytes blood cell is..? |
Leukocyte |
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Hemangiomas is best visualized with..? |
Delayed images |
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Liver cancer is best visualized with..? |
1st pass dynamic |
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Difference in chemical shift is approximately..? |
3.5ppm |
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TFCC tear is best visualized in what plane..? |
Coronal |
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3rd ventricle is dilated and the 4th is not..? |
Aqueduct of sylvius |
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"goal is to do no harm" |
Beneficence |
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Phase encoding step is performed when..? |
Prior to frequency |
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GRE requiring high signal from fluid is all except for..? |
Incoherent |
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TE increased slices increased or decreased..? |
Decreased |
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Source of infection where pathogens thrive enough to cause a threat is..? |
Reservoir |
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Thin slices..? |
Steep slice selection High amplitude slice selection narrow tBW |
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Low freq. (high amp. signal) ? data points in K-space at the start of the scan is aka..? |
Elliptic centric |
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Height of a peak on a MR spectrum correlates to the ___ of a substance that was detected. |
Amount |
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GRE echo for fast breath hold contrast enhanced ___ is utilized. |
Spoiling additional RF pulses used to spoil away trans. mag. |
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Which field strength would require shortest Ti time to suppress signal from fat when performing STIR sequence? |
0.5T |
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Ti should be __ percent of the T1 relaxation time to null signal. |
69 percent |
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Level 2 personnel has..? |
Extensive MR training / revisit this |
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Another term for fever..? |
Febrile |
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FA doubled, RF deposition increases by a factor of..? |
4 |
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Partial or fractional echo is..? |
Half the views of k-space are filled in the freq direction |
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MRA removal of signal from vessel by..? |
Spatial presat. / for all MRA? |
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FA decreases there is less or more T1 info. |
less |
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rBW effects..? |
SNR and chemical shift only? |
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B1 mag. field produced by..? |
RF coil |
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Shimming should not be turned on and off rapidly. |
T |
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Latrogenic is..? |
Adverse reaction caused by treatment |
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Reducing FOV by a factor of 2 will reduce voxel volume by a factor of..? |
4 |
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Dynamic enhanced imaging for vascular structures contrast is administered and K-space is filled ___ to ensure contrast enhancement is well visualized |
Centric |
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TOF MRA use T1 gre echo with TR and FA selections to suppress signal from stationary tissues, visualizing flowing blood by flow related enhancement |
T |
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PC /mra use T2 gre echo with parameter selections that suppress tissues and rely on velocity - induced phase shifts for vascular signal |
T |
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In MRA what parameter aids in signal loss? |
smaller voxel short TE/ written description |