Analysis of Images According to the Fluid Velocity in Time-of-Flight Magnetic Resonance Angiography, and Contrast Enhancement Angiography
- Authors
- Kim, Eng-Chan; Heo, Yeong-Cheol; Cho, Jae-Hwan; Lee, Hyun-Jeong; Lee, Hae-Kag
- Issue Date
- Jun-2014
- Publisher
- 한국자기학회
- Keywords
- TOF angiography; fluid velocity; length of inner cavity; signal-to-noise ratio; contrast-to-noise ratio
- Citation
- Journal of Magnetics, v.19, no.2, pp 185 - 191
- Pages
- 7
- Journal Title
- Journal of Magnetics
- Volume
- 19
- Number
- 2
- Start Page
- 185
- End Page
- 191
- URI
- https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/12153
- DOI
- 10.4283/JMAG.2014.19.2.185
- ISSN
- 1226-1750
2233-6656
- Abstract
- In this study we evaluated that flow rate changes affect the (time of flight) TOF image and contrast-enhanced (CE) in a three-dimensional TOF angiography. We used a 3.0T MR System, a nonpulsatile flow rate model. Saline was used as a fluid injected at a flow rate of 11.4 cm/sec by auto injector. The fluid signal strength, phantom body signal strength and background signal strength were measured at 1, 5, 10, 15, 20 and 25-th cross-section in the experienced images and then they were used to determine signal-to-noise ratio and contrast-to-noise ratio. The inlet, middle and outlet length were measured using coronal images obtained through the maximum intensity projection method. As a result, the length of inner cavity was 2.66 mm with no difference among the inlet, middle and outlet length. We also could know that the magnification rate is 49-55.6% in inlet part, 49-59% in middle part and 49-59% in outlet part, and so the image is generally larger than in the actual measurement. Signal-to-noise ratio and contrast-to-noise ratio were negatively correlated with the fluid velocity and so we could see that signal-to-noise ratio and contrast-to-noise ratio are reduced by faster fluid velocity. Signal-to-noise ratio was 42.2-52.5 in 5-25th section and contrast-to-noise ratio was from 34.0-46.1 also not different, but there was a difference in the 1st section. The smallest 3D TOF MRA measure was 2.51 +/- 0.12 mm with a flow velocity of 40 cm/s. Consequently, 3D TOF MRA tests show that the faster fluid velocity decreases the signal-to-noise ratio and contrast-to-noise ratio, and basically it can be determined that 3D TOF MRA and 3D CE MRA are displayed larger than in the actual measurement.
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Collections - College of Engineering > Department of Computer Science and Engineering > 1. Journal Articles
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