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Related Flashcards
Cards In This Set
| Front | Back |
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Increase TR
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Increases SNRincrease # of slicesincreases scan timedecreases T1 weighting
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Decrease TR
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Increases T1 weightingdecreases scan timedecrease SNRdecreases #of slices
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Increase TE
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Increases T2 weightingdecreases SNR
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Decrease TE
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Increases SNRdecreases T2 weighting
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Increase NEX
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Increases SNR; more signal averagingdirectly proportional increase in scan time
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NEX decrease
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Directly proportional decrease in scan timedecreases SNR;less signal averaging
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Increase slice thickness
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Increases SNRincreases coverage of anatomydecreases spatial resolution;more partial voluming
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Decrease slice thickness
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Increases spatial resolution;reduces part.volumingdecreases SNRdecreases coverage of anatomy
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Increase FOV
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Increases SNRincreased coverage of anatomydecreases spatial resolutiondecreases likelihood of alaising
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Decrease FOV
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Increases spatial resolutionincreases likelihood of alaisingdecreases SNRdecreased coverage of anatomy
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Increase MATRIX
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Increases spatial resolutionincreases scan timedecreases SNR if pixel is small
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Decrease MATRIX
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Decreases scan timeincreases SNR if pixel size is smalldecreases spatial resolution
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Increase receive BANDWIDTH
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Decrease in chemical shiftdecreases minimum TEdecreases spatial resolution
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Decrease receive BANDWITH
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Increases SNRincrease in chemical shiftdecrease in minimum TE
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Large Coil
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Increases are of received signallower SNR sensitive ti alaising artifact with small FOV
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