[논문]Optimization of MR Parameters of 3D TOF-MRA for Various Intracranial Stents at 3.0T MRI

Choi, Jin Woo; Roh, Hong Gee; Moon, Won-Jin; Chun, Young Il; Kang, Chung Hwan

doi:10.5469/neuroint.2011.6.2.71

Optimization of MR Parameters of 3D TOF-MRA for Various Intracranial Stents at 3.0T MRI 원문보기

Neurointervention, v.6 no.2, 2011년, pp.71 - 77

Choi, Jin Woo (Department of Radiology, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea.) , Roh, Hong Gee (Department of Radiology, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea.) , Moon, Won-Jin (Department of Radiology, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea.) , Chun, Young Il (Department of Neurosurgery, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea.) , Kang, Chung Hwan (Department of Radiolgy, Konkuk University Medical Center, Seoul, Korea.)

Abstract ▼ AI-Helper

PurposeThe in-stent signal reduction of the stented artery caused by susceptibility artifact or radiofrequency shielding artifact limited the use of time-of-flight MR angiography (TOF-MRA) as a follow-up tool after intracranial stenting. We showed the degree of an artifact according to different stent types, and optimized MR parameters for TOF-MRA in patients with intracranial stent on 3.0 T MRI.Materials and MethodsFour stents (Neuroform, Wingspan, Solitaire, and Enterprise) were placed in a vascular flow phantom and imaged by changing flip angle (FA; 20°,30°,40°,50° and 60°) and bandwidth (BW; 31, 42 and 62.5 KHz) using TOF-MRA. Source data of each image set with different FA and BW were reconstructed with the maximal intensity projection (MIP) technique, and MIP images were used to evaluate the in-stent signal reduction of each stent according to the change of MR parameters. The in-stent signal reduction was assessed by calculating the relative in-stent signal (RIS) inside the stent as compared with background and signal intensity of the tube outside the stent. The optimal FA and BW of each stent were determined by comparing the RIS in each stent by one-sample t test. Finally, one neuroradiologist chose one image set with the best image quality.ResultsThe mean RIS for Neuroform, Wingspan, Solitaire and Enterprise stent was 66.3 ± 6.0, 44.2 ± 5.8, 22.8 ± 3.3 and 8.2 ± 2.9, respectively. The significantly high RIS of each stent was obtained with FA/BW value of 20°/31 KHz (Neuroform), 20°/31 KHz and 30°/42 KHz (Wingspan), 40°/42 KHz and 50°/31 KHz (Solitaire) and 40°/31 KHz and 50°/31 KHz (Enterprise). Among these MIP images with significantly high RIS, images with FA/BW value of 20°/31 KHz (Neuroform and Wingspan) and 50°/31 KHz (Solitaire and Enterprise) had the best image quality.ConclusionThe degree of artifact was variable according to the design of each intracranial stent. The luminal visualization of closed-cell design stents such as Solitaire and Enterprise can be improved by higher FA. Thus, MR parameter should be adjusted according to the type of intracranial stents.

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참고문헌 (26)

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Optimization of MR Parameters of 3D TOF-MRA for Various Intracranial Stents at 3.0T MRI 원문보기

Abstract ▼ AI-Helper

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