9 results on '"iNAV"'
Search Results
2. Highly efficient free-breathing 3D whole-heart imaging in 3-min: single center study in adults with congenital heart disease
- Author
-
Anastasia Fotaki, Kuberan Pushparajah, Christopher Rush, Camila Munoz, Carlos Velasco, Radhouene Neji, Karl P. Kunze, René M. Botnar, and Claudia Prieto
- Subjects
INAV ,Low-rank ,3D whole-heart ,Congenital heart disease ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Background: Three dimensional, whole-heart (3DWH) MRI is an established non-invasive imaging modality in patients with congenital heart disease (CHD) for the diagnosis of cardiovascular morphology and for clinical decision making. Current techniques utilise diaphragmatic navigation (dNAV) for respiratory motion correction and gating and are frequently limited by long acquisition times. This study proposes and evaluates the diagnostic performance of a respiratory gating-free framework, which considers respiratory image-based navigation (iNAV), and highly accelerated variable density Cartesian sampling in concert with non-rigid motion correction and low-rank patch-based denoising (iNAV-3DWH-PROST). The method is compared to the clinical dNAV-3DWH sequence in adult patients with CHD. Methods: In this prospective single center study, adult patients with CHD who underwent the clinical dNAV-3DWH MRI were also scanned with the iNAV-3DWH-PROST. Diagnostic confidence (4-point Likert scale) and diagnostic accuracy for common cardiovascular lesions was assessed by three readers. Scan times and diagnostic confidence were compared using the Wilcoxon-signed rank test. Co-axial vascular dimensions at three anatomic landmarks were measured, and agreement between the research and the corresponding clinical sequence was assessed with Bland-Altman analysis. Results: The study included 60 participants (mean age ± [SD]: 33 ± 14 years; 36 men). The mean acquisition time of iNAV-3DWH-PROST was significantly lower compared with the conventional clinical sequence (3.1 ± 0.9 min vs 13.9 ± 3.9 min, p
- Published
- 2024
- Full Text
- View/download PDF
3. Efficient non-contrast enhanced 3D Cartesian cardiovascular magnetic resonance angiography of the thoracic aorta in 3 min
- Author
-
Anastasia Fotaki, Camila Munoz, Yaso Emanuel, Alina Hua, Filippo Bosio, Karl P. Kunze, Radhouene Neji, Pier Giorgio Masci, René M. Botnar, and Claudia Prieto
- Subjects
Undersampled Cartesian MRA ,iNAV ,Thoracic aortic disease ,Non-rigid motion correction ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Abstract Background The application of cardiovascular magnetic resonance angiography (CMRA) for the assessment of thoracic aortic disease is often associated with prolonged and unpredictable acquisition times and residual motion artefacts. To overcome these limitations, we have integrated undersampled acquisition with image-based navigators and inline non-rigid motion correction to enable a free-breathing, contrast-free Cartesian CMRA framework for the visualization of the thoracic aorta in a short and predictable scan of 3 min. Methods 35 patients with thoracic aortic disease (36 ± 13y, 14 female) were prospectively enrolled in this single-center study. The proposed 3D T2-prepared balanced steady state free precession (bSSFP) sequence with image-based navigator (iNAV) was compared to the clinical 3D T2-prepared bSSFP with diaphragmatic-navigator gating (dNAV), in terms of image acquisition time. Three cardiologists blinded to iNAV vs. dNAV acquisition, recorded image quality scores across four aortic segments and their overall diagnostic confidence. Contrast ratio (CR) and relative standard deviation (RSD) of signal intensity (SI) in the corresponding segments were estimated. Co-axial aortic dimensions in six landmarks were measured by two readers to evaluate the agreement between the two methods, along with inter-observer and intra-observer agreement. Kolmogorov–Smirnov test, Mann–Whitney U (MWU), Bland–Altman analysis (BAA), intraclass correlation coefficient (ICC) were used for statistical analysis. Results The scan time for the iNAV-based approach was significantly shorter (3.1 ± 0.5 min vs. 12.0 ± 3.0 min for dNAV, P = 0.005). Reconstruction was performed inline in 3.0 ± 0.3 min. Diagnostic confidence was similar for the proposed iNAV versus dNAV for all three reviewers (Reviewer 1: 3.9 ± 0.3 vs. 3.8 ± 0.4, P = 0.7; Reviewer 2: 4.0 ± 0.2 vs. 3.9 ± 0.3, P = 0.4; Reviewer 3: 3.8 ± 0.4 vs. 3.7 ± 0.6, P = 0.3). The proposed method yielded higher image quality scores in terms of artefacts from respiratory motion, and non-diagnostic images due to signal inhomogeneity were observed less frequently. While the dNAV approach outperformed the iNAV method in the CR assessment, the iNAV sequence showed improved signal homogeneity along the entire thoracic aorta [RSD SI 5.1 (4.4, 6.5) vs. 6.5 (4.6, 8.6), P = 0.002]. BAA showed a mean difference of
- Published
- 2022
- Full Text
- View/download PDF
4. Efficient non-contrast enhanced 3D Cartesian cardiovascular magnetic resonance angiography of the thoracic aorta in 3 min.
- Author
-
Fotaki, Anastasia, Munoz, Camila, Emanuel, Yaso, Hua, Alina, Bosio, Filippo, Kunze, Karl P., Neji, Radhouene, Masci, Pier Giorgio, Botnar, René M., and Prieto, Claudia
- Subjects
- *
MAGNETIC resonance angiography , *AORTIC diseases , *CARDIOLOGISTS , *THORACIC aorta , *MANN Whitney U Test , *INTER-observer reliability , *INTRACLASS correlation , *MEDICAL artifacts , *LONGITUDINAL method ,RESEARCH evaluation - Abstract
Background: The application of cardiovascular magnetic resonance angiography (CMRA) for the assessment of thoracic aortic disease is often associated with prolonged and unpredictable acquisition times and residual motion artefacts. To overcome these limitations, we have integrated undersampled acquisition with image-based navigators and inline non-rigid motion correction to enable a free-breathing, contrast-free Cartesian CMRA framework for the visualization of the thoracic aorta in a short and predictable scan of 3 min. Methods: 35 patients with thoracic aortic disease (36 ± 13y, 14 female) were prospectively enrolled in this single-center study. The proposed 3D T2-prepared balanced steady state free precession (bSSFP) sequence with image-based navigator (iNAV) was compared to the clinical 3D T2-prepared bSSFP with diaphragmatic-navigator gating (dNAV), in terms of image acquisition time. Three cardiologists blinded to iNAV vs. dNAV acquisition, recorded image quality scores across four aortic segments and their overall diagnostic confidence. Contrast ratio (CR) and relative standard deviation (RSD) of signal intensity (SI) in the corresponding segments were estimated. Co-axial aortic dimensions in six landmarks were measured by two readers to evaluate the agreement between the two methods, along with inter-observer and intra-observer agreement. Kolmogorov–Smirnov test, Mann–Whitney U (MWU), Bland–Altman analysis (BAA), intraclass correlation coefficient (ICC) were used for statistical analysis. Results: The scan time for the iNAV-based approach was significantly shorter (3.1 ± 0.5 min vs. 12.0 ± 3.0 min for dNAV, P = 0.005). Reconstruction was performed inline in 3.0 ± 0.3 min. Diagnostic confidence was similar for the proposed iNAV versus dNAV for all three reviewers (Reviewer 1: 3.9 ± 0.3 vs. 3.8 ± 0.4, P = 0.7; Reviewer 2: 4.0 ± 0.2 vs. 3.9 ± 0.3, P = 0.4; Reviewer 3: 3.8 ± 0.4 vs. 3.7 ± 0.6, P = 0.3). The proposed method yielded higher image quality scores in terms of artefacts from respiratory motion, and non-diagnostic images due to signal inhomogeneity were observed less frequently. While the dNAV approach outperformed the iNAV method in the CR assessment, the iNAV sequence showed improved signal homogeneity along the entire thoracic aorta [RSD SI 5.1 (4.4, 6.5) vs. 6.5 (4.6, 8.6), P = 0.002]. BAA showed a mean difference of < 0.05 cm across the 6 landmarks between the two datasets. ICC showed excellent inter- and intra-observer reproducibility. Conclusions: Thoracic aortic iNAV-based CMRA with fast acquisition (~ 3 min) and inline reconstruction (3 min) is proposed, resulting in high diagnostic confidence and reproducible aortic measurements. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
5. Penerbangan Otomatis Pesawat Tanpa Awak Sayap Tetap Menggunakan Flight Controller Berbasis iNav.
- Author
-
AKBAR, AURIZA RAHMAD and IMRON, ALI
- Abstract
Copyright of Jurnal Ilmu Komputer dan Agri-Informatika is the property of IPB University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2022
- Full Text
- View/download PDF
6. Highly efficient free-breathing 3D whole-heart imaging in 3-min: single center study in adults with congenital heart disease.
- Author
-
Fotaki, Anastasia, Pushparajah, Kuberan, Rush, Christopher, Munoz, Camila, Velasco, Carlos, Neji, Radhouene, Kunze, Karl P., Botnar, René M., and Prieto, Claudia
- Subjects
- *
HEART anatomy , *HEART radiography , *CONGENITAL heart disease , *DIAGNOSTIC imaging , *DATA analysis , *MAGNETIC resonance imaging , *DESCRIPTIVE statistics , *STATISTICS , *CONCEPTUAL structures , *THREE-dimensional printing , *COMPARATIVE studies , *SENSITIVITY & specificity (Statistics) - Abstract
Three dimensional, whole-heart (3DWH) MRI is an established non-invasive imaging modality in patients with congenital heart disease (CHD) for the diagnosis of cardiovascular morphology and for clinical decision making. Current techniques utilise diaphragmatic navigation (dNAV) for respiratory motion correction and gating and are frequently limited by long acquisition times. This study proposes and evaluates the diagnostic performance of a respiratory gating-free framework, which considers respiratory image-based navigation (iNAV), and highly accelerated variable density Cartesian sampling in concert with non-rigid motion correction and low-rank patch-based denoising (iNAV-3DWH-PROST). The method is compared to the clinical dNAV-3DWH sequence in adult patients with CHD. In this prospective single center study, adult patients with CHD who underwent the clinical dNAV-3DWH MRI were also scanned with the iNAV-3DWH-PROST. Diagnostic confidence (4-point Likert scale) and diagnostic accuracy for common cardiovascular lesions was assessed by three readers. Scan times and diagnostic confidence were compared using the Wilcoxon-signed rank test. Co-axial vascular dimensions at three anatomic landmarks were measured, and agreement between the research and the corresponding clinical sequence was assessed with Bland-Altman analysis. The study included 60 participants (mean age ± [SD]: 33 ± 14 years; 36 men). The mean acquisition time of iNAV-3DWH-PROST was significantly lower compared with the conventional clinical sequence (3.1 ± 0.9 min vs 13.9 ± 3.9 min, p < 0.0001). Diagnostic confidence was higher for the iNAV-3DWH-PROST sequence compared with the clinical sequence (3.9 ± 0.2 vs 3.4 ± 0.8, p < 0.001), however there was no significant difference in diagnostic accuracy. Narrow limits of agreement and mean bias less than 0.08 cm were found between the research and the clinical vascular measurements. The iNAV-3DWH-PROST framework provides efficient, high quality and robust 3D whole-heart imaging in significantly shorter scan time compared to the standard clinical sequence. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
7. Las "casas de Pastorita" en La Habana.
- Author
-
Muñoz Hernández, Ruslan and Zardoya Loureda, María Victoria
- Subjects
- *
CUBAN architecture , *DWELLINGS , *DOMESTIC architecture , *HOUSE construction , *DWELLING design & construction , *MODERN movement (Architecture) , *ARCHITECTURAL design , *ARCHITECTURAL history - Abstract
The construction work of the National Institute of Savings and Housing INAV between 1959 and 1962, chaired by Pastorita Nunez and Gonzalez, marked a momentous time in the production of social housing in Cuba since the triumph of the Revolution. This was considered the most successful and prolific experience in this field due to its magnitude and quality. In this article the results of an investigation of historical and architectural character, based on the query of primary sources and supplemented by fieldwork are summarized. From that, a characterization of the work of INAV was made. [ABSTRACT FROM AUTHOR]
- Published
- 2016
8. Introdução ao DIY Multirotor Como Sistema de Apoio à Inspecção a Infra-estruturas de Produção e Distribuição de Energia
- Author
-
Inácio, Carlos Daniel Sousa and Puga, José Ricardo Teixeira
- Subjects
VANT ,Distribuição ,Legislação ,PDB ,Maintenance ,UAV ,ArduCopter ,Legislation ,Produção ,FPV ,ESC ,Brushless ,Protocolos ,Distribution ,DYI ,Veículo Aéreo Não Tripulado ,VTX ,Multirotor ,Planeamento de Missões ,Pixhawk ,Mission Planner ,Open Source ,Mission Planning ,Energy ,Inspection ,Production ,Inspecção ,Arduíno ,Unmanned aerial vehicle ,Manutenção ,Drone ,Inav ,Energia ,RPA ,Protocols - Abstract
Submitted by Ana Rebelo (amsr@isep.ipp.pt) on 2018-12-11T10:49:08Z No. of bitstreams: 1 DM_CarlosInacio_2018_MEESE.pdf: 8000177 bytes, checksum: 9780de00699f2c710a0f525f0c914af2 (MD5) Approved for entry into archive by Ana Rebelo (amsr@isep.ipp.pt) on 2018-12-11T15:01:03Z (GMT) No. of bitstreams: 1 DM_CarlosInacio_2018_MEESE.pdf: 8000177 bytes, checksum: 9780de00699f2c710a0f525f0c914af2 (MD5) Made available in DSpace on 2018-12-11T15:01:04Z (GMT). No. of bitstreams: 1 DM_CarlosInacio_2018_MEESE.pdf: 8000177 bytes, checksum: 9780de00699f2c710a0f525f0c914af2 (MD5) Previous issue date: 2018
- Published
- 2018
9. Development of motion compensated 3D T2 mapping for cardiac imaging
- Author
-
Tourais, João Luís Silva Canaveira, Botnar, René, and Nunes, Rita Gouveia, 1976
- Subjects
iNAV ,Teses de mestrado - 2015 ,Departamento de Física ,Mapeamento de T2 ,Ressonância magnética cardíaca ,Respiração livre ,Correção de movimento respiratório - Abstract
Tese de mestrado integrado, Engenharia Biomédica e Biofísica (Engenharia Clínica e Instrumentação Médica)Universidade de Lisboa, Faculdade de Ciências, 2015 Submitted by Teresa Boa (tdboa@fc.ul.pt) on 2015-12-16T10:37:26Z No. of bitstreams: 1 ulfc115894_tm_João_Luís_Tourais.pdf: 9919545 bytes, checksum: 4cc16430ac17c6e43b656355dd6f8f34 (MD5) Made available in DSpace on 2015-12-16T10:37:38Z (GMT). No. of bitstreams: 1 ulfc115894_tm_João_Luís_Tourais.pdf: 9919545 bytes, checksum: 4cc16430ac17c6e43b656355dd6f8f34 (MD5) Previous issue date: 2015
- Published
- 2015
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.