MRI Parameters

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Last updated 4:21 PM on 8/7/26
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9 Terms

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Headers of chart

Parameter, SNR, Scan Time, Detail, SAR, Other

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Increased TR

SNR up, scan time up, detail unchanged, SAR down, T1 contrast down, number of slices up

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Increased TE

SNR down, scan time up, detail unchanged, SAR unchanged, T2 weighting up, number of slices down

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TR

Repetition time- time between RF pulses

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TE

Echo time- time between start of RF pulse and peak of signal echo received

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SNR

Signal to noise ratio

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SAR

Specific absorption rate- the rate the tissue absorbs RF energy ; heat

8
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NSA

Number of Signal Averages (also NEX) - number of times a line is sampled for improved image clarity.

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NEX

Number of Excitations (also NSA) - number of times a line is sampled for improved image clarity.