Hello,

 

My query is in relation to calculating the echo spacing (ES) for use in distortion correction of DWI images using FUGUE. I am scanning with a 3T Philips Achieva which does not specify the ES and neither does the DICOM header file. I have asked the local Physicist and he is unsure on how to calculate the ES. The following are my acquisition parameters:

 

Scanning Sequence: SE

Slice thickness: 3mm

TE: 76.56ms

Number of Phase Encoding Steps: 80

Echo Train Length: 47

Pixel Bandwidth: 3295.2Hz

Min TR: 849ms

 

Calculating the ES has been causing me major problems so any help on this topic would be greatly appreciated. If anyone could outline the steps involved in calculating the ES that would be great. Feel free to suggest any parameters i may need to calculate the ES.

 

Thanks

 

Michael