Laboratoř funkční magnetické rezonance

Lékařská fakulta Univerzity Palackého v Olomouci
Fakultní nemocnice Olomouc

Konfigurace FEATu

List of available sections:

1) First-level analysis

Some aspects of the single-subject FEAT analysis, which have been discussed by the Lab members, are summarised here .

A. MISC

No recommendation, yet.

B. DATA

No recommendation, yet.

C. PRE-STATS


C.3 B0 unwarping

Fieldmapping and EPI parameters (all numbers in ms):


AvantoSymphony
EPI TE4140
GREFIELDMAP TE LOWER5.776.11
GREFIELDMAP TE UPPER10.5310.87
GREFIELDMAP TE DELTA4.764.76
EPI ECHO SPACING0.690.56

C.3.1 Fieldmap

Insert FieldmapRad (processed image in Rad, see dcmConvert.sh)

C.3.2 Fieldmap Mag

Insert FieldmapMag_brain (brain-extracted Magnitude image, see dcmConvert.sh)

C.3.3 Effective EPI echo spacing (ms)

See the table above.

C.3.4 EPI TE (ms)

See the table above.

C.3.5 Unwarp direction

Use -y.

C.3.6 Signal loss threshold

Leave default 10 % (discussion needed).

D. STATS


D.6 Full model


D.6.1.8 Convolution

Double-Gamma HRF is the preffered option. Discussion: “the FSL double gamma function uses the parameters from the Glover 1999 paper and is the same as the default canonical HRF used by SPM. We've done some testing with it relative to the single gamma, and couldn't find a single case where the single gamma was a better fit.  The paper is being revised at the moment so there is nothing to cite as yet, but you picked the better HRF function.  I typically cite the glover paper. Interestingly, even the Boyton 1996 paper that introduced the single gamma clearly shows an undershoot in the data, although the authors didn't model it.” Joseph T. Devlin, Ph.D. 24. September 2009 11:33 FSL@JISCMAIL.AC.UK

E. POST-STATS

No recommendation, yet.

F. REGISTRATION

No recommendation, yet.

Kontaktujte nás

Tel.: +420 588 443 418

E-mail: phlustik(at)upol.cz