medical imaging

7Signal Averaging Method (BOLD- fMRI Signal Data)

Outline

Introduction- fMRI

BOLD fMRI

Signal Averaging

Advantages of Signal Averaging

Objective

Method

Method (cont’d)

Flow Chart Diagram

BOLD fMRIData

Time Correlation

In commonFrequency Correlation

SIGNAL AVERAGING

New Hemodynamic Response

Time Correlation with High Threshold

Final MAP

Imaging Parameters

Data Analysis

Results

Frequency Correlation

Time and Frequency Correlation

FTAP Hemodynamic Response Vs. Reference

Final Activation Map; Threshold = 0.6

Activation observed on the sides of the brain

BH Hemodynamic Response bh002

Final Map, Threshold = 0.4

Activation observed on the sides and through the Mid line

DSST1 Hemodynamic Response bh002

Final Map, Threshold = 0.5

Activation only in SLICE # 20 in the back of the brain

DSST2 Hemodynamic Response

Final Map, Threshold = 0.4

DSST3 Hemodynamic Response

0 50 100 150-0.01

-0.005

0

0.005

0.01

0.015DSST3, Hemodynamic Response-bh002

Final Map, Threshold = 0.5DSST3 Final Map, Threshold=0.5

FTAP: bh002 Vs. bh101OLD bh 101YOUNG bh 002

BH: bh002 Vs. bh101Hemodynamic Response for bh101 at Threshold= 0.6:

Hemodynamic Response for bh002 at Threshold= 0.4:

DSST3: bh002 Vs. bh118Hemodynamic Response for bh118 at Threshold= 0.6:

Hemodynamic Response for bh002 at Threshold= 0.5:

0 50 100 150-0.01

-0.005

0

0.005

0.01

0.015DSST3, Hemodynamic Response-bh002

0 50 100 150-0.015

-0.01

-0.005

0

0.005

0.01

0.015

0.02DSST3, Hemodynamic Response-bh118

Conclusion

References