Analysis of Images According to the Fluid Velocity in Time-of-Flight Magnetic Resonance Angiography, and Contrast Enhancement Angiography

Title
Analysis of Images According to the Fluid Velocity in Time-of-Flight Magnetic Resonance Angiography, and Contrast Enhancement Angiography
Author(s)
김응찬Yeong-Cheol Heo[Yeong-Cheol Heo]Jae-Hwan Cho[Jae-Hwan Cho]이현정Hae-Kag Lee[Hae-Kag Lee]
Keywords
MAXIMUM-INTENSITY-PROJECTION; INTRACRANIAL VASCULAR STENOSIS; MR-ANGIOGRAPHY; COMPUTED-TOMOGRAPHY; ARTERIES; BIFURCATION; OCCLUSION; ANEURYSM; DISEASE
Issue Date
201406
Publisher
KOREAN MAGNETICS SOC
Citation
JOURNAL OF MAGNETICS, v.19, no.2, pp.185 - 191
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.
URI
http://hdl.handle.net/YU.REPOSITORY/32054http://dx.doi.org/10.4283/JMAG.2014.19.2.185
ISSN
1226-1750
Appears in Collections:
이과대학 > 물리학과 > Articles
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