The Influence of Number of Signal Average Variation to the Scan Time andAnatomic Information of Lumbar MRI on Sagittal Slice with Stir Sequence

Background: The number of signal averages (NSA) parameters is one of the parameters that can affect thequality of the MRI image making the selection of accurate parameters is necessary to produce an optimalimage produced and a short imaging time.Objectives: The purpose of this study was to determine the effect of variations in the value of the NSA toscan time and get a lumbar MRI anatomical image on sagittal STIR sequences and NSA that generate valueanatomic information with an optimal scan time on lumbar MRI sagittal STIR sequences.Method: This research is a quantitative research experiment conducted with a 1.5 Tesla MRI at the KasihIbu Hospitals Denpasar. Data are in the form of 50 image sagittal STIR sequences MRI lumbar of the 10volunteers with five NSA variations (1, 2, 3, 4 and 5). The assessment is performed by 3 people regardinginformation generated imagery and data were analyzed by using Friedman test.Result: The results showed that there was the influence of variations in the value of the NSA to scan timeand a lumbar MRI anatomical image slices sagittal with STIR sequences with a significance level of p valu