LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 2 of total 2

Search options

  1. Article ; Online: Dark Blood Contrast-Enhanced Brain MRI Using Echo-uT

    Edelman, Robert R / Leloudas, Nondas / Ankenbrandt, William J / Walker, Matthew T / Bobustuc, George C / Bailes, Julian E / Pruitt, Aaron A / Koktzoglou, Ioannis

    Journal of magnetic resonance imaging : JMRI

    2023  

    Abstract: Background: The widely used magnetization-prepared rapid gradient-echo (MPRAGE) sequence makes enhancing lesions and blood vessels appear bright after gadolinium administration. However, dark blood imaging using T1-weighted Sampling Perfection with ... ...

    Abstract Background: The widely used magnetization-prepared rapid gradient-echo (MPRAGE) sequence makes enhancing lesions and blood vessels appear bright after gadolinium administration. However, dark blood imaging using T1-weighted Sampling Perfection with Application optimized Contrast using different flip angle Evolution (T1 SPACE) can be advantageous since it improves the conspicuity of small metastases and leptomeningeal disease. As a potential alternative to T1 SPACE, we evaluated a new dark blood sequence called echo-uT
    Purpose: We compared the performance of echo-uT
    Study type: Retrospective, IRB approved.
    Subjects/phantom: Phantom to assess flow properties of echo-uT
    Field strength/sequences: 3 Tesla/MPRAGE, T1 SPACE, Dixon fid-uT
    Assessment: Flow phantom signal vs. velocity as a function of flip angle and sequence. Qualitative image assessment on 4-point scale. Quantitative evaluation of tumor-to-brain contrast, apparent contrast-to-noise ratio (aCNR), and vessel-to-brain aCNR.
    Statistical tests: Friedman and Mann-Whitney U tests. A P value <0.05 was considered statistically significant.
    Results: In the phantom, echo-uT
    Data conclusion: Volumetric dark blood contrast-enhanced brain MRI is feasible using echo-uT
    Evidence level: 3 TECHNICAL EFFICACY: Stage 1.
    Language English
    Publishing date 2023-11-10
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1146614-5
    ISSN 1522-2586 ; 1053-1807
    ISSN (online) 1522-2586
    ISSN 1053-1807
    DOI 10.1002/jmri.29124
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    In stock of ZB MED Cologne/Königswinter

    Zs.A 3648: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)
    Zs.MO 236: Show issues

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  2. Article ; Online: A method to correct background phase offset for phase-contrast MRI in the presence of steady flow and spatial wrap-around artifact.

    Pruitt, Aaron A / Jin, Ning / Liu, Yingmin / Simonetti, Orlando P / Ahmad, Rizwan

    Magnetic resonance in medicine

    2018  Volume 81, Issue 4, Page(s) 2424–2438

    Abstract: Purpose: Background phase offsets in phase-contrast MRI are often corrected using polynomial regression; however, correction performance degrades when temporally invariant outliers such as steady flow or spatial wrap-around artifact are present. We ... ...

    Abstract Purpose: Background phase offsets in phase-contrast MRI are often corrected using polynomial regression; however, correction performance degrades when temporally invariant outliers such as steady flow or spatial wrap-around artifact are present. We describe and validate an iterative method called automatic rejection of temporally invariant outliers (ARTO), which excludes these outliers from the fitting process.
    Methods: The ARTO method iteratively removes pixels with large polynomial regression errors analyzed by a Gaussian mixture model fitting of the residual distribution. A total of 150 trials of a simulated phantom (75 with wrap-around artifact) and 125 phase-contrast MRI cines from 22 healthy subjects (48 with wrap-around artifact) were used for validation. Background phase offsets were corrected using second-order weighted regularized least squares (WRLS) with and without ARTO. Flow volumes after WRLS and WRLS+ARTO corrections were compared with the known truth (phantom) and stationary phantom reference (in vivo) using Bland-Altman analysis. The ratio between the pulmonary flow and the systemic flow was also computed in a subset of 6 subjects.
    Results: In the simulated phantom, compared with WRLS and no correction, correction with WRLS+ARTO produced superior agreement in volumetric flow quantification with the known truth. In vivo, WRLS+ARTO also produced superior agreement with stationary phantom-corrected volumetric flow compared with WRLS and no correction. In data sets with wrap-around artifact, WRLS produced significantly larger variance in the pulmonary flow and systemic flow ratio than stationary phantom correction (P = .0008).
    Conclusion: The proposed method provides automatic exclusion of temporally invariant outliers and produces flow quantification results comparable to stationary phantom correction.
    MeSH term(s) Adult ; Algorithms ; Aorta, Thoracic/diagnostic imaging ; Artifacts ; Computer Simulation ; Healthy Volunteers ; Hemodynamics ; Humans ; Image Processing, Computer-Assisted/methods ; Least-Squares Analysis ; Magnetic Resonance Imaging ; Models, Theoretical ; Normal Distribution ; Phantoms, Imaging ; Prospective Studies ; Pulmonary Artery/diagnostic imaging ; Regression Analysis ; Stroke Volume ; Young Adult
    Language English
    Publishing date 2018-11-15
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 605774-3
    ISSN 1522-2594 ; 0740-3194
    ISSN (online) 1522-2594
    ISSN 0740-3194
    DOI 10.1002/mrm.27572
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

    More links

    Kategorien

    In stock of ZB MED Cologne/Königswinter

    Zs.A 1959: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

To top