The Signal-to-Noise Indicator or How to Navigate the ‘Bermuda Triangle’

Joachim Graessner, Dipl. Ing.
Siemens Healthcare, Hamburg, Germany

Do you sometimes feel uneasy with the interpretation of the numbers the signal-to-noise indicator shows on the syngo program-card? In his “How I do it” article Jochen Graessner takes away the mystery of parameter changes and explains their mutual dependencies. Find a table on how changing the number of phase encoding steps and averages affects scan time, pixel size and relative SNR, and learn why phase oversampling improves the SNR or why more reference lines in GRAPPA mode do not increase the SNR.