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Seo, Nieun,Park, Seong J,Kim, Bohyun,Lee, Chang K,Huh, Jimi,Kim, Jeong K,Lee, Seung S,Kim, In S,Nickel, Dominik,Kim, Kyung W British Institute of Radiology 2016 The British journal of radiology Vol.89 No.1066
<P>Advances in knowledge: CAIPIRINHA-VIBE and KWIC-Radial- VIBE provide comparably better quality of freebreathing DCE-MRIs than c-VIBE.</P>
Seo, Nieun,Kim, So Yeon,Lee, Seung Soo,Byun, Jae Ho,Kim, Jin Hee,Kim, Hyoung Jung,Lee, Moon-Gyu The Korean Society of Radiology 2016 KOREAN JOURNAL OF RADIOLOGY Vol.17 No.1
<P>Sclerosing cholangitis is a spectrum of chronic progressive cholestatic liver disease characterized by inflammation, fibrosis, and stricture of the bile ducts, which can be classified as primary and secondary sclerosing cholangitis. Primary sclerosing cholangitis is a chronic progressive liver disease of unknown cause. On the other hand, secondary sclerosing cholangitis has identifiable causes that include immunoglobulin G4-related sclerosing disease, recurrent pyogenic cholangitis, ischemic cholangitis, acquired immunodeficiency syndrome-related cholangitis, and eosinophilic cholangitis. In this review, we suggest a systemic approach to the differential diagnosis of sclerosing cholangitis based on the clinical and laboratory findings, as well as the typical imaging features on computed tomography and magnetic resonance (MR) imaging with MR cholangiography. Familiarity with various etiologies of sclerosing cholangitis and awareness of their typical clinical and imaging findings are essential for an accurate diagnosis and appropriate management.</P>
Bowel Angioedema Associated With Iodinated Contrast Media: Incidence and Predisposing Factors
Seo, Nieun,Chung, Yong Eun,Lim, Joon Seok,Song, Mi Kyung,Kim, Myeong-Jin,Kim, Ki Whang Wolters Kluwer Health, Inc. All rights reserved. 2017 Investigative radiology Vol.52 No.9
<P>Conclusions: The incidence ofCM-associated bowel angioedema during CTwas 1.7% to 3.3%, and none of the studied predisposing factors was associated with bowel angioedema.</P>
수술 전 선행보조치료를 받은 직장암 환자의 직장 자기공명영상의 해석
Nieun Seo,Joon Seok Lim 대한영상의학회 2023 대한영상의학회지 Vol.84 No.3
MRI is currently the imaging modality of choice to evaluate rectal cancer after neoadjuvant treatment. The purposes of restaging MRI are to assess the resectability of rectal cancer and to decide whether organ preservation strategies can be applied in patients with a complete clinical response. This review article indicates the key MRI features needed to evaluate rectal cancer after neoadjuvant treatment using a systematic approach. Assessment of primary tumor response including MRI findings to predict a complete response is discussed. Additionally, MRI evaluation of the relationship between the primary tumor and adjacent structures, lymph node response, extramural venous invasion, and tumor deposits after neoadjuvant treatment is presented. Knowledge of these imaging features and their clinical relevance may help radiologists provide an accurate and clinically valuable interpretation of restaging rectal MRI.
Seo Nieun,오혜원,Oh Hyung Jung,Chung Yong Eun 대한영상의학회 2021 Korean Journal of Radiology Vol.22 No.5
Objective: To investigate imaging biomarkers of microperfusion in contrast-induced nephropathy (CIN) using contrastenhanced ultrasound (CEUS). Materials and Methods: The CIN model was fabricated by administering indomethacin (10 mg/kg), L-NAME (15 mg/kg), and iopamidol (10 mL/kg) to Sprague-Dawley rats. After 24 hours, CEUS was performed on CIN (n = 6) and control (n = 6) rats with sulphur hexafluoride microbubbles (SonoVue). From time-intensity curves obtained from the kidney arriving time (AT), acceleration time (AC), time to peak (TTP), and peak enhancement (PE) were measured and compared between the groups. After CEUS, the rats were sacrificed, and cell apoptosis markers were evaluated to confirm the development of CIN. Results: Among CEUS parameters, AT (7.8 ± 1.6 vs. 4.2 ± 0.5 s, p = 0.002), AC (4.7 ± 1.4 vs. 2.0 ± 0.4 s, p = 0.002), and TTP (12.5 ± 2.9 vs. 6.2 ± 0.6 s, p = 0.002) were significantly prolonged in the CIN group compared to controls. PE was significantly higher in the control group than in the CIN group (17.1 ± 1.9 vs. 12.2 ± 2.0 dB, p = 0.004). In kidney tissue, mRNA and protein levels of the apoptotic makers were significantly higher in the CIN group than in the control group (p = 0.003 and p = 0.002). Conclusion: CEUS parameters can be used as imaging biomarkers for microperfusion in CIN. In rats with CIN, AT, AC, and TTP were significantly prolonged, while PE was significantly lower compared to controls.
Lee, Chang Kyung,Seo, Nieun,Kim, Bohyun,Huh, Jimi,Kim, Jeong Kon,Lee, Seung Soo,Kim, In Seong,Nickel, Dominik,Kim, Kyung Won The Korean Society of Radiology 2017 KOREAN JOURNAL OF RADIOLOGY Vol.18 No.2
<P><B>Objective</B></P><P>To compare the breathing effects on dynamic contrast-enhanced (DCE)-MRI between controlled aliasing in parallel imaging results in higher acceleration (CAIPIRINHA)-volumetric interpolated breath-hold examination (VIBE), radial VIBE with k-space-weighted image contrast view-sharing (radial-VIBE), and conventional VIBE (c-VIBE) sequences using a dedicated phantom experiment.</P><P><B>Materials and Methods</B></P><P>We developed a moving platform to simulate breathing motion. We conducted dynamic scanning on a 3T machine (MAGNETOM Skyra, Siemens Healthcare) using CAIPIRINHA-VIBE, radial-VIBE, and c-VIBE for six minutes per sequence. We acquired MRI images of the phantom in both static and moving modes, and we also obtained motion-corrected images for the motion mode. We compared the signal stability and signal-to-noise ratio (SNR) of each sequence according to motion state and used the coefficients of variation (CoV) to determine the degree of signal stability.</P><P><B>Results</B></P><P>With motion, CAIPIRINHA-VIBE showed the best image quality, and the motion correction aligned the images very well. The CoV (%) of CAIPIRINHA-VIBE in the moving mode (18.65) decreased significantly after the motion correction (2.56) (<I>p</I> < 0.001). In contrast, c-VIBE showed severe breathing motion artifacts that did not improve after motion correction. For radial-VIBE, the position of the phantom in the images did not change during motion, but streak artifacts significantly degraded image quality, also after motion correction. In addition, SNR increased in both CAIPIRINHA-VIBE (from 3.37 to 9.41, <I>p</I> < 0.001) and radial-VIBE (from 4.3 to 4.96, <I>p</I> < 0.001) after motion correction.</P><P><B>Conclusion</B></P><P>CAIPIRINHA-VIBE performed best for free-breathing DCE-MRI after motion correction, with excellent image quality.</P>
Lee Sunyoung,김경원,김소연,Seo Nieun,Song Gi-Won,Lee Sung-Gyu 대한초음파의학회 2022 ULTRASONOGRAPHY Vol.41 No.1
Purpose: This study aimed to determine the diagnostic performance of the controlled attenuation parameter (CAP) measured using transient elastography (TE) for assessing macrovesicular steatosis (MaS) in potential living liver donors using same-day biopsy as a reference standard.Methods: This retrospective study included 204 living liver donor candidates who underwent TE and liver biopsy on the same day between July 2013 and June 2014. The histologic degree of MaS was determined. The area under the receiver operating characteristic curve (AUROC) was used to evaluate the performance of CAP for diagnosing MaS of >10%, and the optimal cutoff value was identified using the maximal Youden index.Results: Based on liver biopsy, 185 subjects had MaS of ≤10% and 19 had MaS of >10%. The CAP value was significantly correlated with the percentage of MaS on liver biopsy (r=0.635, P<0.001), and the median CAP value was significantly higher in subjects with MaS of >10% than in those with MaS of ≤10% (300 dB/m vs. 209 dB/m, P<0.001). The AUROC for diagnosing MaS of >10% by CAP was 0.938 (95% confidence interval, 0.896 to 0.967), and a CAP of >259 dB/m yielded a sensitivity of 84.2% and a specificity of 92.4%.Conclusion: The CAP measured using TE was significantly correlated with MaS and accurately detected substantial MaS in potential living liver donors. The CAP is a promising tool for the noninvasive diagnosis of MaS and may be used to screen unsuitable living liver donor candidates.
Magnetic resonance enterography predicts the prognosis of Crohn’s disease
( Ji Hoon Lee ),( Yong Eun Park ),( Nieun Seo ),( Hyun Jung Lee ),( Soo Jung Park ),( Tae Il Kim ),( Won Ho Kim ),( Joon Seok Lim ),( Jae Hee Cheon ) 대한장연구학회 2018 Intestinal Research Vol.16 No.3
Background/Aims: Magnetic resonance enterography (MRE) has emerged as an important tool in the diagnosis and follow-up of Crohn’s disease (CD). The aim of this study was to evaluate whether MRE findings could predict the prognosis of CD. Methods: In this retrospective study, a total of 173 patients with clinical remission of CD (n=61) or active CD (n=112) were identified. The outcomes of clinical relapse, admission, surgery, and need for other medications according to the MRE findings were evaluated. Results: The presence of active inflammation on MRE was observed in 93 (83%) patients with clinically active CD and in 44 (72.1%) patients with clinical remission of CD, without a statistically significant difference (P=0.091). In multivariate analysis, active inflammation on MRE increased the risk for clinical relapse (hazard ratio [HR], 6.985; 95% confidence interval [CI], 1.024-47.649) in patients with clinical remission of CD. In patients with clinically active CD, active inflammation on MRE increased the risk for CD-related hospitalization (HR, 2.970; 95% CI, 1.006-8.772). Conclusions: The presence of active inflammation on MRE was significantly associated with poor prognosis both in patients with clinical remission of CD and in those with active CD. (Intest Res 2018;16:445-457)