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MRI exam > SCAN TIME > Flashcards

SCAN TIME Flashcards

1
Q

Does scan time depend on
A) TR
B)TE

A

A) TR

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2
Q

Does scan time depend on
A) # phase encodings
B) # of frequency encodings

A

A) # of phase encodings

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3
Q

Does scan time depend on
A) flip angle
B) Number of NSA’s

A

B) Number of NSA’s

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4
Q

Does scan time depend on
A) frequency encoding FOV
B) # of slices in 3D imaging

A

B) # of slices in 3D imaging

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5
Q

Does scan time depend on
A) ETL in FSE
B) readout gradient

A

A) ETL in FSE

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6
Q

Does scan time depend on
A) readout gradient
B) # of shots in EPI

A

B) # of shots in EPI

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7
Q

Scan time = TR x #PE x NSA

A

2D SE

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8
Q

Scan time = TR x #PE x NSA x # slices

A

3D imaging

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9
Q

Scan time = TR x #PE x NSA / ETL

A

FSE

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10
Q

Scan time = TR x NSA x # shots

A
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11
Q

Increase TR

A

increase SNR
increase # of slices

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12
Q

increase TR

A

increase scan time
decrease T1 weighting

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13
Q

scan time for a 2D SE pulse sequence can be calculated by
A) TR x # PEs x NSA
B) TR x #PEs x NSA x #slices
C) TR x #PEs x NSA/ETL
D) TR x #shots x NSA

A

a

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14
Q

when performing a 2D IR pulse sequence the time can be calculated by
A) TR x # PEs x NSA
B) TR x #PEs x NSA x #slices
C) TR x #PEs x NSA/ETL
D) TR x #shots x NSA

A

a

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15
Q

scan time for 2D GE pulse sequences can be calculated by
A) TR x # PEs x NSA
B) TR x #PEs x NSA x #slices
C) TR x #PEs x NSA/ETL
D) TR x #shots x NSA

A

a

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16
Q

scan time for EPI sequences can be calculated by
A) TR x # PEs x NSA
B) TR x #PEs x NSA x #slices
C) TR x #PEs x NSA/ETL
D) TR x #shots x NSA

A

d

17
Q

scan time for 2D FSE sequences can be calculated by
A) TR x # PEs x NSA
B) TR x #PEs x NSA x #slices
C) TR x #PEs x NSA/ETL
D) TR x #shots x NSA

A

c

18
Q

scan time for a volume acquisition can be calculated by
A) TR x # PEs x NSA
B) TR x #PEs x NSA x #slices
C) TR x #PEs x NSA/ETL
D) TR x #shots x NSA

A

b

19
Q

in a FSE pulse sequence, if the ETL is increased by a factor of 4 the scan will be
A) 1x as fast
B) 2x as fast
C) 3x as fast
D) 4x as fast

A

d

20
Q

in a volume acquisition the scan time is
A) TR x NSA x BW x thickness
B) TR x NSA x PEs x slab thickness
C) TR x NSA x PEs x ETL
D) TR x NSA x PE’s x # of slices

A

d

21
Q

number of shots is calculated by
A) TR x PEs
B) #PEs/ETL
C) ETL/#PE’s
D) #PEs x NSA

A

b

22
Q

a single shot FSE sequence is acquired when
A) #PEs=256, ETL=256
B) #PEs= 128, ETL= 256
C) #PEs= 256, ETL= 128
D) #PE’s = 256, ETL= 64

A

a

23
Q

a multi-shot FSE sequence is acquired with 4 shots when
A) #PEs=256, ETL= 256
B) #PEs=128, ETL= 256
C) #PEs= 256, ETL= 128
D) #PEs= 256, ETL= 64

A

d

24
Q

to keep scan time to a minimum, diffusion imaging is usually performed with
A) single shot EPI
B) single shot FSE
C) 2 shot EPI
D) 4 shot EPI

A

a

MRI exam (14 decks)

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