Outline - Image Quality

Table of Contents

Outline - Image Quality

TR and Image Quality

Factors Affecting MRImage Quality

Longer Echo Times(TEís) Yield:

Field of ViewReduction

Signal-to-Noise Ratio isproportional to Voxel Size

Contrast/Noise Ratio(CNR)

Matrix Size

Image Quality

Image Quality

Field of View andSignal/Noise Ratio

Slice Thickness andSignal/Noise Ratio

Slice Thickness

Averaging (NEX)and Signal/Noise Ratio

Averaging (NEX)

Contrast/Noise Ratioand Echo Time (TE)

Echo Time (T1-wtd)

Contrast/Noise Ratioand Repetition Time (TR)

Slice Order

Interslice Crosstalk

Longer RepetitionTimes (TRís)Yield:

Effects of TR (density weighted)

Effects of TR (T2 weighted)

Bandwidth

Bandwidth

Slice Selection

Longer RepetitionTimes (TRís)Yield:

Spatio-temporal Resolution and Invasiveness ofTechniques forStudying Brain Function

Email: mscohen@ucla.edu

Home Page: www.brainmapping.org

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