PARAMETER ESTIMATION OF BALLOON MODEL IN FMRI USING STEEPEST DESCENT METHOD

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Karimi mohammad mehdi; HOSSEINZADEH GHOLAM ALI; SETAREHDAN Seyyed Kamaloddin

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Seminar Paper

Paper Information

Seminar: IRANIAN CONFERENCE ON BIOMEDICAL ENGINEERING
Year:2004 | Issue:11

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Title

PARAMETER ESTIMATION OF BALLOON MODEL IN FMRI USING STEEPEST DESCENT METHOD

Author(s)

Karimi mohammad mehdi | HOSSEINZADEH GHOLAM ALI | SETAREHDAN Seyyed Kamaloddin

Keywords

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Abstract

HEMODYNAMIC SYSTEM, AS AN INTERMEDIATE PROCESS BETWEEN NEURAL ACTIVITY AND MEASURED FMRI SIGNAL, IS RECENTLY MODELED WITH NONLINEAR APPROACHES. AMONG FEW MODELS INTRODUCED SO FAR, THE BALLOON IS THE MOST COMPLETE MODEL, WHICH ALSO HAS SOME PHYSIOLOGICAL INTERPRETATIONS. IN SPITE OF ITS CAPABILITIES, THE BALLOON MODEL NEEDS A NONLINEAR SYSTEM IDENTIFICATION PROCEDURE FOR ESTIMATING ITS PARAMETERS. AFTER THIS STEP, THE ANALYST WILL BE ABLE TO INTERPRET THE PARAMETERS, OR USE THE IDENTIFIED MODEL FOR ACTIVATION DETECTION.IN THIS PAPER, WE INTRODUCED A METHODOLOGY FOR ESTIMATING THE PARAMETERS OF THIS MODEL BASED ON STEEPEST DESCENT ALGORITHM. WE FIRST USED A SIMPLE STRATEGY (BASED ON CORRELATION) TO IDENTIFY THE ACTIVE VOXELS. THEN USING THE STEEPEST DESCENT ALGORITHM WE FIND THE BEST SET OF PARAMETERS (IN THE MODEL) THAT FIT TO THE MEASURED FMRI DATA (TIME SERIES OF EACH ACTIVATED VOXEL). ESTIMATED PARAMETERS ARE CONSISTENT WITH PREVIOUS STUDIES THAT USED OTHER COMPLEX SYSTEM IDENTIFICATION APPROACHES. THIS METHOD AND ESTIMATED PARAMETERS CAN BE USED IN FUTURE STUDIES OF FMRI.

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APA: Copy

Karimi, mohammad mehdi, HOSSEINZADEH, GHOLAM ALI, & SETAREHDAN, Seyyed Kamaloddin. (2004). PARAMETER ESTIMATION OF BALLOON MODEL IN FMRI USING STEEPEST DESCENT METHOD. IRANIAN CONFERENCE ON BIOMEDICAL ENGINEERING. SID. https://sid.ir/paper/905553/en

Vancouver: Copy

Karimi mohammad mehdi, HOSSEINZADEH GHOLAM ALI, SETAREHDAN Seyyed Kamaloddin. PARAMETER ESTIMATION OF BALLOON MODEL IN FMRI USING STEEPEST DESCENT METHOD. 2004. Available from: https://sid.ir/paper/905553/en

IEEE: Copy

mohammad mehdi Karimi, GHOLAM ALI HOSSEINZADEH, and Seyyed Kamaloddin SETAREHDAN, “PARAMETER ESTIMATION OF BALLOON MODEL IN FMRI USING STEEPEST DESCENT METHOD,” presented at the IRANIAN CONFERENCE ON BIOMEDICAL ENGINEERING. 2004, [Online]. Available: https://sid.ir/paper/905553/en

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