Question

What would the scan time be in a 3D volume acquisition as follows: TR 24 ms, TE 7 ms, Flip Angle 15°, FOV 20cm, 2mm slice thickness, 76 slices, 176 x 256 matrix, 1 NEX?

Answer 1

The scan time in a 3D volume acquisition is approximately 2140.16 seconds.

Step-by-step explanation:

To calculate the scan time in a 3D volume acquisition, we need to consider the parameters given:

• TR (Repetition Time) = 24 ms
• TE (Echo Time) = 7 ms
• Flip Angle = 15°
• FOV (Field of View) = 20 cm
• Slice Thickness = 2 mm
• Number of Slices = 76
• Matrix Size = 176 x 256
• NEX (Number of Excitations) = 1

First, we need to calculate the total time for one repetition (TR) using the formula:

TR = TR + TE + (TR / NEX)

Substituting the given values:

TR = 24 ms + 7 ms + (24 ms / 1)

TR = 55 ms

Next, we calculate the total time for one slice:

Total Time for One Slice = TR * (Matrix Size / NEX)

Substituting the given values:

Total Time for One Slice = 55 ms * (176 x 256 / 1)

Total Time for One Slice = 28.16 s

Finally, we calculate the scan time for the entire 3D volume acquisition:

Scan Time = Total Time for One Slice * Number of Slices

Substituting the given values:

Scan Time = 28.16 s * 76

Scan Time = 2140.16 s

Therefore, the scan time in a 3D volume acquisition, based on the given parameters, would be approximately 2140.16 seconds.