Effects of NEX on SNR and Artifacts in Parallel MR Images Acquired using Reference Scan
- Authors
- Heo, Yeong-Cheol; Lee, Hae-Kag; Cho, Jae-Hwan
- Issue Date
- Dec-2013
- Publisher
- 한국자기학회
- Keywords
- reference scan; NEX; SNR; SENSE artifact
- Citation
- Journal of Magnetics, v.18, no.4, pp 422 - 427
- Pages
- 6
- Journal Title
- Journal of Magnetics
- Volume
- 18
- Number
- 4
- Start Page
- 422
- End Page
- 427
- URI
- https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/13170
- DOI
- 10.4283/JMAG.2013.18.4.422
- ISSN
- 1226-1750
2233-6656
- Abstract
- The aim of this study was to investigate effects of the number of acquisitions (NEX) on signal-to-noise (SNR) and artifacts in SENSE parallel imaging of magnetic resonance imaging (MRI). 3.0T MR System, 8 Channel sensitivity encoding (SENSE) head coils were used along with an in-vivo phantom. Reference sequence of 3D fast field echo (FFE) was consisted of NEX values of 2, 4, 6, 8, 10 and 12. The T2 turbo spin echo (TSE) sequence used for exams achieved SENSE factors of 1.2, 1.5, 1.8, 2.0, 2.2, 2.5, 2.8, 3.0, 3.2, 3.5, 3.8 and 4.0. Exams were conducted five times for each SENSE factor to measure signal intensity of the object, the posterior phase-encode direction and frequency direction. And SNR was calculated using mean values. SENSE artifacts were identified as background signal intensity in the phase-encoded direction using MRIcro. It was found that SNR increased but SENSE artifacts reduced with NEX of 4, 8 and 12 when the NEX increased in reference scan. It is therefore concluded that image quality can be improved with NEX of 4, 8 and 12 for reference scanning.
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Collections - College of Engineering > Department of Computer Science and Engineering > 1. Journal Articles
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