Pengaruh Parameter Number Of Excitation (NEX) Terhadap SNR

Dwi Rochmayanti(1*), Thomas Sri Widodo(2), Indah Soesanti(3)

(*) Corresponding Author


This research aims to observe the influence of Number of Excitation (NEX) to both
parameters the Signal to Noise Ratio (SNR) and the scanning time when performing the MR
neck . Some MR scan parameters (TR, TE, FOV, slice thickness, matrix, flip angle and
bandwidth) are strictly under controlled. All SNR data, due to the 6 NEX variations (NEX 1 to
NEX 6), are required by comparing the ROI’s intensity between the noise background and the
areas of corpus and spinal cord on the images. The scan times are also recorded for each of the
NEX variations being observed. In conclusion, increasing NEX values will simultaneously rise
the SNR and the scanning time.
Keywords : NEX, SNR, Image MRI, Scan time

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