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Grad2

Converting 3D gradient echo-antiecho ser files into the corresponding sine-cosine format

Most of this info was collected (the hard way) by Barbara Potts

Grad2 is program which converts 3D gradient echo-antiecho ser files into the corresponding sine-cosine format - basically shuffles the data into States format so that it can be processed in FELIX. Grad2 was compiled on SunOS 4.1.3. Courtesy of Li Xiang

Download grad2 binary. Use the download feature of your browser.

You'll also want a script which feeds your 3D ser files to the grad2 program two at a time (grad2 combines 1st and 2nd ser file, 3rd and 4th ser file....), courtesy of Jarrod Smith.

According to Barb:
For the gradient coerence transfer select data, after shuffling with grad2, the first point in D3 starts at zero. So for the mirror image lp, you must multiply by -1 before doing rev. Also, since you are getting rid of one point (by shifting left) before rev, it's nice to follow up witht linear prediction of the first point of the co-added data to smooth things out:
eg) for 40 complex points:

def datype 1
def datsiz 40
zf 80
shr 40
stb 2
shl 41
shr 40
mul -1   (otherwise it ain't sinusoidal)
cnj
rev (or fol followed by mul 2)
adb 2
ldb 2
lpf 32 8 4 1   (otherwise you have a bum first point)
lpl 80 10 8 81 104
shl 40
sb 64 90
etc.