| Summary: | MRI Optimization, a hands on approach to improve image quality by
manipulating scan parameter. One of this parameter is NSA, which contributes on
SNR and scan time. A study about the influence of NSA shift to SNR to identify
the existence of NSA shift to SNR and scan time had performed. The study aims
to determine the alteration value of SNR when NSA was changed for every
number and to obtain the NSA value which has more optimum image quality.
The study was performed in Telogorejo Hospital at Semarang with MR
modalities AirisII Hitachi 0.3 tesla by shifting NSA from 1 to 5 in cervical
vertebrae (neck) sagittal T1 weighted with spin echo sequence. The SNR of five
images were calculated with Matlab tool. SNR value was obtained by measuring
the ROI at body of vertebra, spinal cord area and discus intervertebra to attain the
signal average value. The signal average value was then devided by ROI at
backgrounds.
Experiment results show that the greater the NSA, the SNR is better and
scan time is longer. SNR of the organ corpus, medulla spinalis and diskus
intervertebra is increases from NSA 1 to 2 is 51%. When the NSA is raised to 3,
the SNR increase is 89%, for NSA 4 the SNR increase is 99%, for NSA 5 the
SNR increase is 102% . To get an SNR up to 100%, the NSA 4 is
used. Meanwhile, to get images with good SNR and imaging duration is not
long, the NSA 3 is used.
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