1
|
Cui L, McWalter EJ, Moran G, Venugopal N. Design and development of a novel flexible ultra-short echo time (FUSE) sequence. Magn Reson Med 2023; 90:1905-1918. [PMID: 37392415 DOI: 10.1002/mrm.29784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 05/28/2023] [Accepted: 06/13/2023] [Indexed: 07/03/2023]
Abstract
PURPOSE To present the validation of a new Flexible Ultra-Short Echo time (FUSE) pulse sequence using a short-T2 phantom. METHODS FUSE was developed to include a range of RF excitation pulses, trajectories, dimensionalities, and long-T2 suppression techniques, enabling real-time interchangeability of acquisition parameters. Additionally, we developed an improved 3D deblurring algorithm to correct for off-resonance artifacts. Several experiments were conducted to validate the efficacy of FUSE, by comparing different approaches for off-resonance artifact correction, variations in RF pulse and trajectory combinations, and long-T2 suppression techniques. All scans were performed on a 3 T system using an in-house short-T2 phantom. The evaluation of results included qualitative comparisons and quantitative assessments of the SNR and contrast-to-noise ratio. RESULTS Using the capabilities of FUSE, we demonstrated that we could combine a shorter readout duration with our improved deblurring algorithm to effectively reduce off-resonance artifacts. Among the different RF and trajectory combinations, the spiral trajectory with the regular half-inc pulse achieves the highest SNRs. The dual-echo subtraction technique delivers better short-T2 contrast and superior suppression of water and agar signals, whereas the off-resonance saturation method successfully suppresses water and lipid signals simultaneously. CONCLUSION In this work, we have validated the use of our new FUSE sequence using a short T2 phantom, demonstrating that multiple UTE acquisitions can be achieved within a single sequence. This new sequence may be useful for acquiring improved UTE images and the development of UTE imaging protocols.
Collapse
Affiliation(s)
- Lumeng Cui
- Division of Biomedical Engineering, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Emily J McWalter
- Department of Mechanical Engineering and Division of Biomedical Engineering, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Gerald Moran
- Siemens Healthcare Limited, Oakville, Ontario, Canada
| | - Niranjan Venugopal
- Department of Radiology, University of Manitoba, Winnipeg, Manitoba, Canada
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, Canada
| |
Collapse
|
2
|
Li N, Tous C, Dimov IP, Fei P, Zhang Q, Lessard S, Moran G, Jin N, Kadoury S, Tang A, Martel S, Soulez G. Design of a Patient-Specific Respiratory-Motion-Simulating Platform for In Vitro 4D Flow MRI. Ann Biomed Eng 2022; 51:1028-1039. [PMID: 36580223 DOI: 10.1007/s10439-022-03117-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 12/04/2022] [Indexed: 12/30/2022]
Abstract
Four-dimensional (4D) flow magnetic resonance imaging (MRI) is a leading-edge imaging technique and has numerous medicinal applications. In vitro 4D flow MRI can offer some advantages over in vivo ones, especially in accurately controlling flow rate (gold standard), removing patient and user-specific variations, and minimizing animal testing. Here, a complete testing method and a respiratory-motion-simulating platform are proposed for in vitro validation of 4D flow MRI. A silicon phantom based on the hepatic arteries of a living pig is made. Under the free-breathing, a human volunteer's liver motion (inferior-superior direction) is tracked using a pencil-beam MRI navigator and is extracted and converted into velocity-distance pairs to program the respiratory-motion-simulating platform. With the magnitude displacement of about 1.3 cm, the difference between the motions obtained from the volunteer and our platform is ≤ 1 mm which is within the positioning error of the MRI navigator. The influence of the platform on the MRI signal-to-noise ratio can be eliminated even if the actuator is placed in the MRI room. The 4D flow measurement errors are respectively 0.4% (stationary phantom), 9.4% (gating window = 3 mm), 27.3% (gating window = 4 mm) and 33.1% (gating window = 7 mm). The vessel resolutions decreased with the increase of the gating window. The low-cost simulation system, assembled from commercially available components, is easy to be duplicated.
Collapse
Affiliation(s)
- Ning Li
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montreal, QC, H2X 0A9, Canada
- Université de Montréal, 2900 Boulevard Édouard-Montpetit, Montreal, QC, H3T 1J4, Canada
| | - Cyril Tous
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montreal, QC, H2X 0A9, Canada
- Université de Montréal, 2900 Boulevard Édouard-Montpetit, Montreal, QC, H3T 1J4, Canada
| | - Ivan P Dimov
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montreal, QC, H2X 0A9, Canada
- Université de Montréal, 2900 Boulevard Édouard-Montpetit, Montreal, QC, H3T 1J4, Canada
| | - Phillip Fei
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montreal, QC, H2X 0A9, Canada
- Université de Montréal, 2900 Boulevard Édouard-Montpetit, Montreal, QC, H3T 1J4, Canada
| | - Quan Zhang
- Shanghai University, 266 Jufengyuan Rd, Shanghai, 200444, China
| | - Simon Lessard
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montreal, QC, H2X 0A9, Canada
- Université de Montréal, 2900 Boulevard Édouard-Montpetit, Montreal, QC, H3T 1J4, Canada
| | - Gerald Moran
- Siemens Canada, 1577 North Service Rd E, Oakville, ON, L6H 0H6, Canada
| | - Ning Jin
- Siemens Medical Solutions Inc., 40 Liberty Boulevard, Malvern, PA, 19355, USA
| | - Samuel Kadoury
- Polytechnique Montréal, 2500 Chemin de Polytechnique, Montreal, QC, H3T 1J4, Canada
| | - An Tang
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montreal, QC, H2X 0A9, Canada
- Université de Montréal, 2900 Boulevard Édouard-Montpetit, Montreal, QC, H3T 1J4, Canada
- Department of Radiology, Centre hospitalier de l'Université de Montréal (CHUM), 1000 Rue Saint-Denis, Montreal, QC, H2X 0C1, Canada
| | - Sylvain Martel
- Polytechnique Montréal, 2500 Chemin de Polytechnique, Montreal, QC, H3T 1J4, Canada
| | - Gilles Soulez
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montreal, QC, H2X 0A9, Canada.
- Université de Montréal, 2900 Boulevard Édouard-Montpetit, Montreal, QC, H3T 1J4, Canada.
- Department of Radiology, Centre hospitalier de l'Université de Montréal (CHUM), 1000 Rue Saint-Denis, Montreal, QC, H2X 0C1, Canada.
| |
Collapse
|
3
|
Ellul P, Schembri J, Baldacchino VA, Molnar T, Resal T, Allocca MA, Furfaro F, Dal Buono, Theodoropoulou A, Fragaki M, Tsoukali E, Mantzaris GJ, Phillips F, Radford S, Moran G, Gonzalez HA, Sebastian S, Fousekis F, Christodoulou D, Snir Y, Lerner Z, Yanai H, Michalopoulos G, Tua J, Camilleri L, Papamichael K, Karmiris K, Katsanos K. Post-inflammatory polyps burden as a prognostic marker of disease-outcome in patients with inflammatory bowel disease. J Crohns Colitis 2022; 17:489-496. [PMID: 36322687 DOI: 10.1093/ecco-jcc/jjac169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Indexed: 02/08/2023]
Abstract
INTRODUCTION AND AIM Post-inflammatory polyps (PIPs) are considered as indicators of previous episodes of severe inflammation and mucosal ulceration. Inflammatory bowel disease (IBD), namely Crohn's disease (CD) and ulcerative colitis (UC), exhibit a perpetuating, relapsing, and remitting pattern and PIPs is a frequent sequela of chronicity. The aim of this study was to determine whether a high PIPs burden is associated with a more severe disease course in patients with IBD. METHODS This was a multinational, multicentre, retrospective study. IBD patients previously diagnosed with PIPs were retrieved from the endoscopic database of each centre. PIPs burden was evaluated and associated with demographic and clinical data as well as factors indicating a more unfavorable disease course. RESULTS A total of 504 IBD patients with PIPs were recruited (male: 61.9%). The mean age at IBD diagnosis was 36.9 (±16.8) years. Most patients (74.8%) were diagnosed with UC. A high PIPs burden was present in 53.4% of patients. On multivariable Cox regression analysis, high PIPs burden was independently associated with treatment escalation (HR 1.35, 95% CI 1.04-1.75; P=0.024), hospitalization (HR 1.90; 95% CI 1.24 - 2.90; P=0.003), need for surgery (HR 2.28; 95% CI 1.17-4.44, P=0.02) and younger age at diagnosis (HR 0.99, 95% CI 0.98-0,99; p=0.003). CONCLUSION PIPs burden was associated with a more severe outcome. Future prospective studies should focus on the characterisation of PIPs burden as to further risk stratify this patient cohort.
Collapse
Affiliation(s)
- P Ellul
- Division of Gastroenterology, Mater Dei hospital, Malta
| | - J Schembri
- Division of Gastroenterology, Mater Dei hospital, Malta
| | | | - T Molnar
- Department of Medicine, Szent-Györgyi Albert Medical School, University of Szeged, Hungary
| | - T Resal
- Department of Medicine, Szent-Györgyi Albert Medical School, University of Szeged, Hungary
| | - M A Allocca
- Gastroenterology and Endoscopy, IRCCS Hospital San Raffaele and University Vita-Salute San Raffaele, Milan, Italy
| | - F Furfaro
- Gastroenterology and Endoscopy, IRCCS Hospital San Raffaele and University Vita-Salute San Raffaele, Milan, Italy
| | - Dal Buono
- IRCCS Humanitas Research Hospital, Rozzano, Milan, Italy
| | - A Theodoropoulou
- Department of Gastroenterology, Venizeleio General Hospital, Heraklion, Greece
| | - M Fragaki
- Department of Gastroenterology, Venizeleio General Hospital, Heraklion, Greece
| | - E Tsoukali
- Department of Gastroenterology, GHA "Evangelismos-Polykliniki', Athens, Greece
| | - G J Mantzaris
- Department of Gastroenterology, GHA "Evangelismos-Polykliniki', Athens, Greece
| | - F Phillips
- Nottingham University Hospitals NHS Trust, Nottingham, England
| | - S Radford
- Nottingham University Hospitals NHS Trust, Nottingham, England
| | - G Moran
- Nottingham University Hospitals NHS Trust, Nottingham, England
| | | | - S Sebastian
- Hull University Teaching Hospitals, Hull, UK
| | - F Fousekis
- Division of Gastroenterology, Department of Internal Medicine, Faculty of Medicine, School of Health Sciences, University of Ioannina, Ioannina, Greece
| | - D Christodoulou
- Division of Gastroenterology, Department of Internal Medicine, Faculty of Medicine, School of Health Sciences, University of Ioannina, Ioannina, Greece
| | - Y Snir
- Division of Gastroenterology, Rabin Medical Center, Petah Tikva, Israel
| | - Z Lerner
- Division of Gastroenterology, Rabin Medical Center, Petah Tikva, Israel
| | - H Yanai
- Division of Gastroenterology, Rabin Medical Center, Petah Tikva, Israel
| | - G Michalopoulos
- Gastroenterology department "Tzaneion" General Hospital of Piraeus, Greece
| | - J Tua
- Division of Gastroenterology, Mater Dei hospital, Malta
| | - L Camilleri
- Faculty of Science, University of Malta, Malta
| | - K Papamichael
- Center for Inflammatory Bowel Diseases, Division of Gastroenterology, Beth-Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
| | - K Karmiris
- Department of Gastroenterology, Venizeleio General Hospital, Heraklion, Greece
| | - K Katsanos
- Division of Gastroenterology, Department of Internal Medicine, Faculty of Medicine, School of Health Sciences, University of Ioannina, Ioannina, Greece
| |
Collapse
|
4
|
Dimov IP, Tous C, Li N, Barat M, Bomberna T, Debbaut C, Jin N, Moran G, Tang A, Soulez G. Assessment of hepatic arterial hemodynamics with 4D flow MRI: in vitro analysis of motion and spatial resolution related error and in vivo feasibility study in 20 volunteers. Eur Radiol 2022; 32:8639-8648. [PMID: 35731288 DOI: 10.1007/s00330-022-08890-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 04/25/2022] [Accepted: 05/17/2022] [Indexed: 11/30/2022]
Abstract
OBJECTIVES To assess the ability of four-dimensional (4D) flow MRI to measure hepatic arterial hemodynamics by determining the effects of spatial resolution and respiratory motion suppression in vitro and its applicability in vivo with comparison to two-dimensional (2D) phase-contrast MRI. METHODS A dynamic hepatic artery phantom and 20 consecutive volunteers were scanned. The accuracies of Cartesian 4D flow sequences with k-space reordering and navigator gating at four spatial resolutions (0.5- to 1-mm isotropic) and navigator acceptance windows (± 8 to ± 2 mm) and one 2D phase-contrast sequence (0.5-mm in -plane) were assessed in vitro at 3 T. Two sequences centered on gastroduodenal and hepatic artery branches were assessed in vivo for intra - and interobserver agreement and compared to 2D phase-contrast. RESULTS In vitro, higher spatial resolution led to a greater decrease in error than narrower navigator window (30.5 to -4.67% vs -6.64 to -4.67% for flow). In vivo, hepatic and gastroduodenal arteries were more often visualized with the higher resolution sequence (90 vs 71%). Despite similar interobserver agreement (κ = 0.660 and 0.704), the higher resolution sequence had lower variability for area (CV = 20.04 vs 30.67%), flow (CV = 34.92 vs 51.99%), and average velocity (CV = 26.47 vs 44.76%). 4D flow had lower differences between inflow and outflow at the hepatic artery bifurcation (11.03 ± 5.05% and 15.69 ± 6.14%) than 2D phase-contrast (28.77 ± 21.01%). CONCLUSION High-resolution 4D flow can assess hepatic artery anatomy and hemodynamics with improved accuracy, greater vessel visibility, better interobserver reliability, and internal consistency. KEY POINTS • Motion-suppressed Cartesian four-dimensional (4D) flow MRI with higher spatial resolution provides more accurate measurements even when accepted respiratory motion exceeds voxel size. • 4D flow MRI with higher spatial resolution provides substantial interobserver agreement for visualization of hepatic artery branches. • Lower peak and average velocities and a trend toward better internal consistency were observed with 4D flow MRI as compared to 2D phase-contrast.
Collapse
Affiliation(s)
- Ivan P Dimov
- Laboratory of Clinical Image Processing (LCTI), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), 900, rue Saint-Denis, Pavillon R, Montreal, QC, H2X 0A9, Canada
| | - Cyril Tous
- Laboratory of Clinical Image Processing (LCTI), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), 900, rue Saint-Denis, Pavillon R, Montreal, QC, H2X 0A9, Canada
| | - Ning Li
- Laboratory of Clinical Image Processing (LCTI), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), 900, rue Saint-Denis, Pavillon R, Montreal, QC, H2X 0A9, Canada
| | - Maxime Barat
- Laboratory of Clinical Image Processing (LCTI), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), 900, rue Saint-Denis, Pavillon R, Montreal, QC, H2X 0A9, Canada.,Department of Radiology and Nuclear Medicine, Centre Hospitalier de l'Université de Montréal (CHUM), Montreal, QC, Canada
| | - Tim Bomberna
- IBiTech-Biommeda, Department of Electronics and Information Systems, Ghent University, Ghent, Belgium.,Cancer Research Institute Ghent (CRIG), Ghent University, Ghent, Belgium
| | - Charlotte Debbaut
- IBiTech-Biommeda, Department of Electronics and Information Systems, Ghent University, Ghent, Belgium.,Cancer Research Institute Ghent (CRIG), Ghent University, Ghent, Belgium
| | - Ning Jin
- Cardiovascular MR R&D, Siemens Medical Solutions USA, Inc., Cleveland, OH, USA
| | - Gerald Moran
- Siemens Healthineers Canada, Oakville, ON, Canada
| | - An Tang
- Laboratory of Clinical Image Processing (LCTI), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), 900, rue Saint-Denis, Pavillon R, Montreal, QC, H2X 0A9, Canada.,Department of Radiology and Nuclear Medicine, Centre Hospitalier de l'Université de Montréal (CHUM), Montreal, QC, Canada.,Department of Radiology, Radiation Oncology and Nuclear Medicine, Faculty of Medecine, Université de Montréal, 2900 Bd Edouard-Montpetit , Montreal, QC, H3T 1J4, Canada
| | - Gilles Soulez
- Laboratory of Clinical Image Processing (LCTI), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), 900, rue Saint-Denis, Pavillon R, Montreal, QC, H2X 0A9, Canada. .,Department of Radiology and Nuclear Medicine, Centre Hospitalier de l'Université de Montréal (CHUM), Montreal, QC, Canada. .,Department of Radiology, Radiation Oncology and Nuclear Medicine, Faculty of Medecine, Université de Montréal, 2900 Bd Edouard-Montpetit , Montreal, QC, H3T 1J4, Canada.
| |
Collapse
|
5
|
Dassanayake P, Cui L, Finger E, Kewin M, Hadaway J, Soddu A, Jakoby B, Zuehlsdorf S, Lawrence KSS, Moran G, Anazodo UC. caliPER: A software for blood-free parametric Patlak mapping using PET/MRI input function. Neuroimage 2022; 256:119261. [PMID: 35500806 DOI: 10.1016/j.neuroimage.2022.119261] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 04/05/2022] [Accepted: 04/26/2022] [Indexed: 01/23/2023] Open
Abstract
Routine clinical use of absolute PET quantification techniques is limited by the need for serial arterial blood sampling for input function and more importantly by the lack of automated pharmacokinetic analysis tools that can be readily implemented in clinic with minimal effort. PET/MRI provides the ability for absolute quantification of PET probes without the need for serial arterial blood sampling using image-derived input functions (IDIFs). Here we introduce caliPER, a modular and scalable software for simplified pharmacokinetic modelling of PET probes with irreversible uptake or binding based on PET/MR IDIFs and Patlak Plot analysis. caliPER generates regional values or parametric maps of net influx rate (Ki) using reconstructed dynamic PET images and anatomical MRI aligned to PET for IDIF vessel delineation. We evaluated the performance of caliPER for blood-free region-based and pixel-wise Patlak analyses of [18F] FDG by comparing caliPER IDIF to serial arterial blood input functions and its application in imaging brain glucose hypometabolism in Frontotemporal dementia. IDIFs corrected for partial volume errors including spill-out and spill-in effects were similar to arterial blood input functions with a general bias of around 6-8%, even for arteries <5 mm. The Ki and cerebral metabolic rate of glucose estimated using caliPER IDIF were similar to estimates using arterial blood sampling (<2%) and within limits of whole brain values reported in literature. Overall, caliPER is a promising tool for irreversible PET tracer quantification and can simplify the ability to perform parametric analysis in clinical settings without the need for blood sampling.
Collapse
Affiliation(s)
- Praveen Dassanayake
- Lawson Health Research Institute, Ontario, London, Canada; Department of Medical Biophysics, Western University, Ontario, London, Canada
| | - Lumeng Cui
- Division of Biomedical Engineering, University of Saskatchewan, Saskatoon, Canada; Siemens Healthineers, Ontario, Mississauga, Oakville, Canada
| | - Elizabeth Finger
- Lawson Health Research Institute, Ontario, London, Canada; Department of Clinical Neurological Sciences, Schulich School of Medicine and Dentistry, Western University, Ontario, London, Canada
| | - Matthew Kewin
- Department of Medical Biophysics, Western University, Ontario, London, Canada
| | | | - Andrea Soddu
- Department of Physics and Astronomy, Western University, Ontario, London, Canada
| | - Bjoern Jakoby
- Siemens Healthcare GmbH, Healthineers, Erlangen, Germany
| | - Sven Zuehlsdorf
- Siemens Medical Solutions USA, Inc. Hoffman Estates, IL, USA
| | - Keith S St Lawrence
- Lawson Health Research Institute, Ontario, London, Canada; Department of Medical Biophysics, Western University, Ontario, London, Canada
| | - Gerald Moran
- Siemens Healthineers, Ontario, Mississauga, Oakville, Canada
| | - Udunna C Anazodo
- Lawson Health Research Institute, Ontario, London, Canada; Department of Medical Biophysics, Western University, Ontario, London, Canada; Department of Neurology and Neurosurgery, Montreal Neurological Institute, Montreal, Canada.
| |
Collapse
|
6
|
Tous C, Li N, Dimov IP, Kadoury S, Tang A, Häfeli UO, Nosrati Z, Saatchi K, Moran G, Couch MJ, Martel S, Lessard S, Soulez G. Navigation of Microrobots by MRI: Impact of Gravitational, Friction and Thrust Forces on Steering Success. Ann Biomed Eng 2021; 49:3724-3736. [PMID: 34622313 DOI: 10.1007/s10439-021-02865-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Accepted: 09/07/2021] [Indexed: 10/20/2022]
Abstract
INTRODUCTION Magnetic resonance navigation (MRN) uses MRI gradients to steer magnetic drug-eluting beads (MDEBs) across vascular bifurcations. We aim to experimentally verify our theoretical forces balance model (gravitational, thrust, friction, buoyant and gradient steering forces) to improve the MRN targeted success rate. METHOD A single-bifurcation phantom (3 mm inner diameter) made of poly-vinyl alcohol was connected to a cardiac pump at 0.8 mL/s, 60 beats/minutes with a glycerol solution to reproduce the viscosity of blood. MDEB aggregates (25 ± 6 particles, 200 [Formula: see text]) were released into the main branch through a 5F catheter. The phantom was tilted horizontally from - 10° to +25° to evaluate the MRN performance. RESULTS The gravitational force was equivalent to 71.85 mT/m in a 3T MRI. The gradient duration and amplitude had a power relationship (amplitude=78.717 [Formula: see text]). It was possible, in 15° elevated vascular branches, to steer 87% of injected aggregates if two MRI gradients are simultaneously activated ([Formula: see text] = +26.5 mT/m, [Formula: see text]= +18 mT/m for 57% duty cycle), the flow velocity was minimized to 8 cm/s and a residual pulsatile flow to minimize the force of friction. CONCLUSION Our experimental model can determine the maximum elevation angle MRN can perform in a single-bifurcation phantom simulating in vivo conditions.
Collapse
Affiliation(s)
- Cyril Tous
- Centre de recherche du Centre hospitalier de l, Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montreal, QC, H2X 0A9, Canada.,Université de Montréal, 2900 Boulevard Édouard-Montpetit, Montreal, QC, H3T 1J4, Canada
| | - Ning Li
- Centre de recherche du Centre hospitalier de l, Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montreal, QC, H2X 0A9, Canada.,Université de Montréal, 2900 Boulevard Édouard-Montpetit, Montreal, QC, H3T 1J4, Canada
| | - Ivan P Dimov
- Centre de recherche du Centre hospitalier de l, Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montreal, QC, H2X 0A9, Canada
| | - Samuel Kadoury
- Polytechnique Montréal, 2500 Chemin de Polytechnique, 28, Montreal, QC, H3T 1J4, Canada
| | - An Tang
- Centre de recherche du Centre hospitalier de l, Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montreal, QC, H2X 0A9, Canada.,Université de Montréal, 2900 Boulevard Édouard-Montpetit, Montreal, QC, H3T 1J4, Canada
| | - Urs O Häfeli
- University of British Columbia, 2405 Westbrook Mall, Vancouver, BC, V6T 1Z3, Canada
| | - Zeynab Nosrati
- University of British Columbia, 2405 Westbrook Mall, Vancouver, BC, V6T 1Z3, Canada
| | - Katayoun Saatchi
- University of British Columbia, 2405 Westbrook Mall, Vancouver, BC, V6T 1Z3, Canada
| | | | | | - Sylvain Martel
- Polytechnique Montréal, 2500 Chemin de Polytechnique, 28, Montreal, QC, H3T 1J4, Canada
| | - Simon Lessard
- Université de Montréal, 2900 Boulevard Édouard-Montpetit, Montreal, QC, H3T 1J4, Canada.,École de Technologie Supérieur, 1100 Rue Notre-Dame O, Montreal, QC, H3C 1K3, Canada
| | - Gilles Soulez
- Centre de recherche du Centre hospitalier de l, Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montreal, QC, H2X 0A9, Canada. .,Université de Montréal, 2900 Boulevard Édouard-Montpetit, Montreal, QC, H3T 1J4, Canada.
| |
Collapse
|
7
|
Poirier SE, Kwan BYM, Jurkiewicz MT, Samargandy L, Iacobelli M, Steven DA, Lam Shin Cheung V, Moran G, Prato FS, Thompson RT, Burneo JG, Anazodo UC, Thiessen JD. An evaluation of the diagnostic equivalence of 18F-FDG-PET between hybrid PET/MRI and PET/CT in drug-resistant epilepsy: A pilot study. Epilepsy Res 2021; 172:106583. [PMID: 33636504 DOI: 10.1016/j.eplepsyres.2021.106583] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Revised: 01/27/2021] [Accepted: 02/09/2021] [Indexed: 01/19/2023]
Abstract
OBJECTIVE Hybrid PET/MRI may improve detection of seizure-onset zone (SOZ) in drug-resistant epilepsy (DRE), however, concerns over PET bias from MRI-based attenuation correction (MRAC) have limited clinical adoption of PET/MRI. This study evaluated the diagnostic equivalency and potential clinical value of PET/MRI against PET/CT in DRE. MATERIALS AND METHODS MRI, FDG-PET and CT images (n = 18) were acquired using a hybrid PET/MRI and a CT scanner. To assess diagnostic equivalency, PET was reconstructed using MRAC (RESOLUTE) and CT-based attenuation correction (CTAC) to generate PET/MRI and PET/CT images, respectively. PET/MRI and PET/CT images were compared qualitatively through visual assessment and quantitatively through regional standardized uptake value (SUV) and z-score assessment. Diagnostic accuracy and sensitivity of PET/MRI and PET/CT for SOZ detection were calculated through comparison to reference standards (clinical hypothesis and histopathology, respectively). RESULTS Inter-reader agreement in visual assessment of PET/MRI and PET/CT images was 78 % and 81 %, respectively. PET/MRI and PET/CT were strongly correlated in mean SUV (r = 0.99, p < 0.001) and z-scores (r = 0.92, p < 0.001) across all brain regions. MRAC SUV bias was <5% in most brain regions except the inferior temporal gyrus, temporal pole, and cerebellum. Diagnostic accuracy and sensitivity were similar between PET/MRI and PET/CT (87 % vs. 85 % and 83 % vs. 83 %, respectively). CONCLUSION We demonstrate here that PET/MRI with optimal MRAC can yield similar diagnostic performance as PET/CT. Nevertheless, further exploration of the potential added value of PET/MRI is necessary before clinical adoption of PET/MRI for epilepsy imaging.
Collapse
Affiliation(s)
- Stefan E Poirier
- Lawson Imaging, Lawson Health Research Institute, London, ON, Canada; Department of Medical Biophysics, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada.
| | - Benjamin Y M Kwan
- Department of Diagnostic Radiology, Queen's University, Kingston, ON, Canada
| | - Michael T Jurkiewicz
- Department of Medical Imaging, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada
| | - Lina Samargandy
- Department of Medical Imaging, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada
| | - Maryssa Iacobelli
- Lawson Imaging, Lawson Health Research Institute, London, ON, Canada
| | - David A Steven
- Department of Clinical Neurological Sciences, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada; Department of Epidemiology and Biostatistics, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada
| | - Victor Lam Shin Cheung
- Department of Medical Imaging, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada
| | | | - Frank S Prato
- Lawson Imaging, Lawson Health Research Institute, London, ON, Canada; Department of Medical Biophysics, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada; Department of Medical Imaging, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada
| | - R Terry Thompson
- Lawson Imaging, Lawson Health Research Institute, London, ON, Canada; Department of Medical Biophysics, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada; Department of Medical Imaging, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada
| | - Jorge G Burneo
- Department of Clinical Neurological Sciences, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada; Department of Epidemiology and Biostatistics, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada
| | - Udunna C Anazodo
- Lawson Imaging, Lawson Health Research Institute, London, ON, Canada; Department of Medical Biophysics, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada; Department of Clinical Neurological Sciences, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada; Research Centre for Studies in Aging, McGill University, Montréal, QC, Canada.
| | - Jonathan D Thiessen
- Lawson Imaging, Lawson Health Research Institute, London, ON, Canada; Department of Medical Biophysics, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada; Department of Medical Imaging, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada
| |
Collapse
|
8
|
Li N, Jiang Y, Plantefève R, Michaud F, Nosrati Z, Tremblay C, Saatchi K, Häfeli UO, Kadoury S, Moran G, Joly F, Martel S, Soulez G. Magnetic Resonance Navigation for Targeted Embolization in a Two-Level Bifurcation Phantom. Ann Biomed Eng 2019; 47:2402-2415. [PMID: 31290038 DOI: 10.1007/s10439-019-02317-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 06/28/2019] [Indexed: 12/22/2022]
Abstract
This work combines a particle injection system with our proposed magnetic resonance navigation (MRN) sequence with the intention of validating MRN in a two-bifurcation phantom for endovascular treatment of hepatocellular carcinoma (HCC). A theoretical physical model used to calculate the most appropriate size of the magnetic drug-eluting bead (MDEB, 200 μm) aggregates was proposed. The aggregates were injected into the phantom by a dedicated particle injector while a trigger signal was automatically sent to the MRI to start MRN which consists of interleaved tracking and steering sequences. When the main branch of the phantom was parallel to B0, the aggregate distribution ratio in the (left-left, left-right, right-left and right-right divisions was obtained with results of 8, 68, 24 and 0% respectively at baseline (no MRN) and increased to 84%, 100, 84 and 92% (p < 0.001, p = 0.004, p < 0.001, p < 0.001) after implementing our MRN protocol. When the main branch was perpendicular to B0, the right-left branch, having the smallest baseline distribution rate of 0%, reached 80% (p < 0.001) after applying MRN. Moreover, the success rate of MRN was always more than 92% at the 1st bifurcation in the experiments above.
Collapse
Affiliation(s)
- Ning Li
- Polytechnique Montréal, Chemin de Polytechnique, 2500 Chemin de Polytechnique, Montréal, QC, 28 H3T 1J4, Canada.,Laboratory of Clinical Image Processing, Le Centre de recherche du CHUM (CRCHUM), 900 Rue Saint-Denis, Montréal, QC, H2X 0A9, Canada
| | - Yuting Jiang
- Laboratory of Clinical Image Processing, Le Centre de recherche du CHUM (CRCHUM), 900 Rue Saint-Denis, Montréal, QC, H2X 0A9, Canada.,Department of Radiology, Radiation-Oncology and Nuclear Medicine and Institute of Biomedical Engineering, Université de Montréal, 2900 Boulevard Édouard-Montpetit, Montréal, QC, H3T 1J4, Canada
| | - Rosalie Plantefève
- Laboratory of Clinical Image Processing, Le Centre de recherche du CHUM (CRCHUM), 900 Rue Saint-Denis, Montréal, QC, H2X 0A9, Canada
| | - Francois Michaud
- Laboratory of Clinical Image Processing, Le Centre de recherche du CHUM (CRCHUM), 900 Rue Saint-Denis, Montréal, QC, H2X 0A9, Canada.,Department of Radiology, Radiation-Oncology and Nuclear Medicine and Institute of Biomedical Engineering, Université de Montréal, 2900 Boulevard Édouard-Montpetit, Montréal, QC, H3T 1J4, Canada
| | - Zeynab Nosrati
- University of British Columbia, 2405 Wesbrook Mall, Vancouver, BC, V6T 1Z3, Canada
| | - Charles Tremblay
- Polytechnique Montréal, Chemin de Polytechnique, 2500 Chemin de Polytechnique, Montréal, QC, 28 H3T 1J4, Canada
| | - Katayoun Saatchi
- University of British Columbia, 2405 Wesbrook Mall, Vancouver, BC, V6T 1Z3, Canada
| | - Urs O Häfeli
- University of British Columbia, 2405 Wesbrook Mall, Vancouver, BC, V6T 1Z3, Canada
| | - Samuel Kadoury
- Polytechnique Montréal, Chemin de Polytechnique, 2500 Chemin de Polytechnique, Montréal, QC, 28 H3T 1J4, Canada.,Laboratory of Clinical Image Processing, Le Centre de recherche du CHUM (CRCHUM), 900 Rue Saint-Denis, Montréal, QC, H2X 0A9, Canada
| | | | - Florian Joly
- INRIA Paris, 2 rue Simone Iff, 75012, Paris, France
| | - Sylvain Martel
- Polytechnique Montréal, Chemin de Polytechnique, 2500 Chemin de Polytechnique, Montréal, QC, 28 H3T 1J4, Canada
| | - Gilles Soulez
- Laboratory of Clinical Image Processing, Le Centre de recherche du CHUM (CRCHUM), 900 Rue Saint-Denis, Montréal, QC, H2X 0A9, Canada. .,Department of Radiology, Radiation-Oncology and Nuclear Medicine and Institute of Biomedical Engineering, Université de Montréal, 2900 Boulevard Édouard-Montpetit, Montréal, QC, H3T 1J4, Canada.
| |
Collapse
|
9
|
Michaud F, Li N, Plantefève R, Nosrati Z, Tremblay C, Saatchi K, Moran G, Bigot A, Häfeli UO, Kadoury S, Tang A, Perreault P, Martel S, Soulez G. Selective embolization with magnetized microbeads using magnetic resonance navigation in a controlled-flow liver model. Med Phys 2018; 46:789-799. [PMID: 30451303 DOI: 10.1002/mp.13298] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 10/18/2018] [Accepted: 11/04/2018] [Indexed: 12/29/2022] Open
Abstract
PURPOSE The purpose of this study was to demonstrate the feasibility of using a custom gradient sequence on an unmodified 3T magnetic resonance imaging (MRI) scanner to perform magnetic resonance navigation (MRN) by investigating the blood flow control method in vivo, reproducing the obtained rheology in a phantom mimicking porcine hepatic arterial anatomy, injecting magnetized microbead aggregates through an implantable catheter, and steering the aggregates across arterial bifurcations for selective tumor embolization. MATERIALS AND METHODS In the first phase, arterial hepatic velocity was measured using cine phase-contrast imaging in seven pigs under free-flow conditions and controlled-flow conditions, whereby a balloon catheter is used to occlude arterial flow and saline is injected at different rates. Three of the seven pigs previously underwent selective lobe embolization to simulate a chemoembolization procedure. In the second phase, the measured in vivo controlled-flow velocities were approximately reproduced in a Y-shaped vascular bifurcation phantom by injecting saline at an average rate of 0.6 mL/s with a pulsatile component. Aggregates of 200-μm magnetized particles were steered toward the right or left hepatic branch using a 20-mT/m MRN gradient. The phantom was oriented at 0°, 45°, and 90° with respect to the B0 magnetic field. The steering differences between left-right gradient and baseline were calculated using Fisher's exact test. A theoretical model of the trajectory of the aggregate within the main phantom branch taking into account gravity, magnetic force, and hydrodynamic drag was also designed, solved, and validated against the experimental results to characterize the physical limitations of the method. RESULTS At an injection rate of 0.5 mL/s, the average flow velocity decreased from 20 ± 15 to 8.4 ± 5.0 cm/s after occlusion in nonembolized pigs and from 13.6 ± 2.0 to 5.4 ± 3.0 cm/s in previously embolized pigs. The pulsatility index measured to be 1.7 ± 1.8 and 1.1 ± 0.1 for nonembolized and embolized pigs, respectively, decreased to 0.6 ± 0.4 and 0.7 ± 0.3 after occlusion. For MRN performed at each orientation, the left-right distribution of aggregates was 55%, 25%, and 75% on baseline and 100%, 100%, and 100% (P < 0.001, P = 0.003, P = 0.003) after the application of MRN, respectively. According to the theoretical model, the aggregate reaches a stable transverse position located toward the direction of the gradient at a distance equal to 5.8% of the radius away from the centerline within 0.11 s, at which point the aggregate will have transited through a longitudinal distance of 1.0 mm from its release position. CONCLUSION In this study, we showed that the use of a balloon catheter reduces arterial hepatic flow magnitude and variation with the aim to reduce steering failures caused by fast blood flow rates and low magnetic steering forces. A mathematical model confirmed that the reduced flow rate is low enough to maximize steering ratio. After reproducing the flow rate in a vascular bifurcation phantom, we demonstrated the feasibility of MRN after injection of microparticle aggregates through a dedicated injector. This work is an important step leading to MRN-based selective embolization techniques in humans.
Collapse
Affiliation(s)
- François Michaud
- Université de Montréal, 2900 Boulevard Edouard-Montpetit, Montréal, Québec, H3T 1J4, Canada.,Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montréal, Québec, H2X 0A9, Canada
| | - Ning Li
- Polytechnique Montréal, 2500 Chemin de Polytechnique, Montréal, Québec, H3T 1J4, Canada
| | - Rosalie Plantefève
- Université de Montréal, 2900 Boulevard Edouard-Montpetit, Montréal, Québec, H3T 1J4, Canada.,Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montréal, Québec, H2X 0A9, Canada
| | - Zeynab Nosrati
- University of British Columbia, 2405 Wesbrook Mall, Vancouver, British-Columbia, V6T 1Z3, Canada
| | - Charles Tremblay
- Polytechnique Montréal, 2500 Chemin de Polytechnique, Montréal, Québec, H3T 1J4, Canada
| | - Katayoun Saatchi
- University of British Columbia, 2405 Wesbrook Mall, Vancouver, British-Columbia, V6T 1Z3, Canada
| | - Gerald Moran
- Siemens Healthcare Limited, 1577 North Service Road East, Oakville, Ontario, L6H 0H6, Canada
| | - Alexandre Bigot
- Université de Montréal, 2900 Boulevard Edouard-Montpetit, Montréal, Québec, H3T 1J4, Canada.,Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montréal, Québec, H2X 0A9, Canada
| | - Urs O Häfeli
- University of British Columbia, 2405 Wesbrook Mall, Vancouver, British-Columbia, V6T 1Z3, Canada
| | - Samuel Kadoury
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montréal, Québec, H2X 0A9, Canada.,Polytechnique Montréal, 2500 Chemin de Polytechnique, Montréal, Québec, H3T 1J4, Canada
| | - An Tang
- Université de Montréal, 2900 Boulevard Edouard-Montpetit, Montréal, Québec, H3T 1J4, Canada.,Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montréal, Québec, H2X 0A9, Canada
| | - Pierre Perreault
- Université de Montréal, 2900 Boulevard Edouard-Montpetit, Montréal, Québec, H3T 1J4, Canada.,Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montréal, Québec, H2X 0A9, Canada
| | - Sylvain Martel
- Polytechnique Montréal, 2500 Chemin de Polytechnique, Montréal, Québec, H3T 1J4, Canada
| | - Gilles Soulez
- Université de Montréal, 2900 Boulevard Edouard-Montpetit, Montréal, Québec, H3T 1J4, Canada.,Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Rue Saint-Denis, Montréal, Québec, H2X 0A9, Canada
| |
Collapse
|
10
|
Asafu-Adjei D, Moran G, Li G, Lipsky M, Stember D, Stahl P. 335 Implant Selection Patterns and Reoperation Rates amongst Solid Organ Transplant Recipients that Underwent Penile Prosthesis Surgery. J Sex Med 2018. [DOI: 10.1016/j.jsxm.2017.11.215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
11
|
Olave C, Morales N, Uberti B, Henriquez C, Sarmiento J, Ortloff A, Folch H, Moran G. Tamoxifen induces apoptotic neutrophil efferocytosis in horses. Vet Res Commun 2018; 42:57-63. [PMID: 29297134 DOI: 10.1007/s11259-017-9709-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 12/26/2017] [Indexed: 02/08/2023]
Abstract
Macrophages and neutrophils are important cellular components in the process of acute inflammation and its subsequent resolution, and evidence increasingly suggests that they play important functions during the resolution of chronic, adaptive inflammatory processes. Exacerbated neutrophil activity can be harmful to surrounding tissues; this is important in a range of diseases, including allergic asthma and chronic obstructive pulmonary disease in humans, and equine asthma (also known as recurrent airway obstruction (RAO). Tamoxifen (TX) is a non-steroidal estrogen receptor modulator with effects on cell growth and survival. Previous studies showed that TX treatment in horses with induced acute pulmonary inflammation promoted early apoptosis of blood and BALF neutrophils, reduction of BALF neutrophils, and improvement in animals' clinical status. The aim of this study was to describe if TX induces in vitro efferocytosis of neutrophils by alveolar macrophages. Efferocytosis assay, myeloperoxidase (MPO) detection and translocation phosphatidylserine (PS) were performed on neutrophils isolated from peripheral blood samples from five healthy horses. In in vitro samples from heathy horses, TX treatment increases the phenomenon of efferocytosis of peripheral neutrophils by alveolar macrophages. Similar increases in supernatant MPO concentration and PS translocation were observed in TX-treated neutrophils, compared to control cells. In conclusion, these results confirm that tamoxifen has a direct effect on equine peripheral blood neutrophils, through stimulation of the engulfment of apoptotic neutrophils by alveolar macrophages.
Collapse
Affiliation(s)
- C Olave
- Department of Pharmacology, Faculty of Veterinary Sciences, Universidad Austral de Chile, Valdivia, Chile
| | - N Morales
- Department of Pharmacology, Faculty of Veterinary Sciences, Universidad Austral de Chile, Valdivia, Chile
| | - B Uberti
- Department of Clinical Veterinary Sciences, Faculty of Veterinary Sciences, Universidad Austral de Chile, Valdivia, Chile
| | - C Henriquez
- Department of Pharmacology, Faculty of Veterinary Sciences, Universidad Austral de Chile, Valdivia, Chile
| | - J Sarmiento
- Department of Physiology, Faculty of Medicine, Universidad Austral de Chile, Valdivia, Chile
| | - A Ortloff
- College of Veterinary Medicine, Universidad Catolica de Temuco, Temuco, Chile
| | - H Folch
- Department of Immunology, Faculty of Medicine, Universidad Austral de Chile, Valdivia, Chile
| | - G Moran
- Department of Pharmacology, Faculty of Veterinary Sciences, Universidad Austral de Chile, Valdivia, Chile.
| |
Collapse
|
12
|
Borlone C, Morales N, Henriquez C, Folch H, Olave C, Sarmiento J, Uberti B, Moran G. In Vitro effects of tamoxifen on equine neutrophils. Res Vet Sci 2016; 110:60-64. [PMID: 28159238 DOI: 10.1016/j.rvsc.2016.11.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 10/26/2016] [Accepted: 11/03/2016] [Indexed: 10/20/2022]
Abstract
Neutrophils participate in innate immunity as the first line of host defense against microorganisms. However, exacerbated neutrophil activity can be harmful to surrounding tissues; this is important in a range of diseases, including allergic asthma and chronic obstructive pulmonary disease in humans, and equine asthma (also known as recurrent airway obstruction (RAO). Tamoxifen (TX) is a non-steroidal estrogen receptor modulator with effects on cell growth and survival. Previous preliminary studies showed that TX treatment in horses with induced acute pulmonary inflammation promoted early apoptosis of blood and BALF neutrophils, reduction of BALF neutrophils, and improvement in animals' clinical status. The aim of this study was to evaluate the in vitro effect of TX on functional tests in equine peripheral blood neutrophils. Chemotaxis, respiratory burst production and phagocytosis assays were performed on neutrophils isolated from peripheral blood samples from 10 healthy horses. Results showed that IL-8 stimulated cells decrease their chemotactic index when treated with TX (1 and 10μM). Respiratory burst production was also dampened after treatment with TX. In conclusion, these results confirm that tamoxifen has a direct action on equine peripheral blood neutrophils. However, more in vivo and in vitro studies are required to fully understand the mechanisms of action of TX on neutrophils, in order to elucidate if it can be used as treatment in disorders such as allergic asthma in humans and horses.
Collapse
Affiliation(s)
- C Borlone
- Department of Pharmacology, Faculty of Veterinary Science, Universidad Austral de Chile, Valdivia, Chile
| | - N Morales
- Department of Pharmacology, Faculty of Veterinary Science, Universidad Austral de Chile, Valdivia, Chile
| | - C Henriquez
- Department of Pharmacology, Faculty of Veterinary Science, Universidad Austral de Chile, Valdivia, Chile
| | - H Folch
- Department of Immunology, Faculty of Medicine, Universidad Austral de Chile, Valdivia, Chile
| | - C Olave
- Department of Pharmacology, Faculty of Veterinary Science, Universidad Austral de Chile, Valdivia, Chile
| | - J Sarmiento
- Department of Physiology, Faculty of Medicine, Universidad Austral de Chile, Valdivia, Chile
| | - B Uberti
- Department of Veterinary Clinical Sciences, Faculty of Veterinary Science, Universidad Austral de Chile, Valdivia, Chile
| | - G Moran
- Department of Pharmacology, Faculty of Veterinary Science, Universidad Austral de Chile, Valdivia, Chile.
| |
Collapse
|
13
|
Miao S, Wang ZJ, Pan L, Butler J, Moran G, Liao R. Scatter to volume registration for model-free respiratory motion estimation from dynamic MRIs. Comput Med Imaging Graph 2016; 52:72-81. [PMID: 27180910 DOI: 10.1016/j.compmedimag.2016.03.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Revised: 03/09/2016] [Accepted: 03/10/2016] [Indexed: 10/22/2022]
Abstract
Respiratory motion is one major complicating factor in many image acquisition applications and image-guided interventions. Existing respiratory motion estimation and compensation methods typically rely on breathing motion models learned from certain training data, and therefore may not be able to effectively handle intra-subject and/or inter-subject variations of respiratory motion. In this paper, we propose a respiratory motion compensation framework that directly recovers motion fields from sparsely spaced and efficiently acquired dynamic 2-D MRIs without using a learned respiratory motion model. We present a scatter-to-volume deformable registration algorithm to register dynamic 2-D MRIs with a static 3-D MRI to recover dense deformation fields. Practical considerations and approximations are provided to solve the scatter-to-volume registration problem efficiently. The performance of the proposed method was investigated on both synthetic and real MRI datasets, and the results showed significant improvements over the state-of-art respiratory motion modeling methods. We also demonstrated a potential application of the proposed method on MRI-based motion corrected PET imaging using hybrid PET/MRI.
Collapse
Affiliation(s)
- S Miao
- Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; Medical Imaging Technology, Siemens Healthcare, Princeton, NJ 08540, USA.
| | - Z J Wang
- Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - L Pan
- Siemens Healthcare, Baltimore, MD 21205, USA
| | - J Butler
- Lawson Health Research Institute, London, ON N6C 2R5, Canada
| | - G Moran
- Siemens Canada, Oakville, ON L6H 0H6, Canada
| | - R Liao
- Medical Imaging Technology, Siemens Healthcare, Princeton, NJ 08540, USA
| |
Collapse
|
14
|
Daly P, Moran G. Safety assessment of a novel active ingredient, acetyl aspartic acid, according to the EU Cosmetics Regulation and the Scientific Committee on Consumer Safety guidelines. Int J Cosmet Sci 2015; 37 Suppl 1:21-7. [PMID: 26114401 DOI: 10.1111/ics.12257] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 06/17/2015] [Indexed: 11/27/2022]
Abstract
OBJECTIVE Acetyl aspartic acid (A-A-A) was proposed as a new novel active ingredient for use in cosmetics. The safety of A-A-A was assessed by following an in-house-developed 'New Ingredient Testing Strategy', which was designed in accordance with the Scientific Committee on Consumer Safety (SCCS) notes of guidance and the requirements of Annex I of the EU Cosmetics Regulation. The aim of the project was to determine whether A-A-A was safe for use in cosmetics and to determine a maximum permitted safe level in the formulations. METHODS A literature review was conducted, consulting over 40 different information sources. This highlighted a number of gaps which required testing data. A-A-A was tested for phototoxicity according to OECD test guideline 432, skin irritation according to OECD test guideline 439 and eye irritation according to OECD test guideline 437. Dermal absorption of A-A-A was measured according to OECD test guideline 428 and was used to calculate the margin of safety (MoS). Finally, A-A-A was tested in a human repeat insult patch test (HRIPT) and a 14-day in-use tolerance study. RESULTS A-A-A was non-phototoxic and was non-irritating to skin and eyes in in vitro testing. Dermal absorption was calculated to be 5%. The MoS for A-A-A was 351, at a level of 5%, for all cosmetic product types, indicating no systemic safety toxicity concern. A-A-A at 5% under occlusive patch on a panel of 50 adult volunteers induced no skin irritation or allergic reaction in the HRIPT study. Finally, repeated application of A-A-A to the periocular area, twice per day for 14 days, in 21 female volunteers, demonstrated that 1% A-A-A was well tolerated following dermatological and ophthalmological assessment in a cosmetic formulation. CONCLUSION A-A-A was assessed as safe by the cosmetic safety assessor for use in cosmetics at a level of 5% in all cosmetic product types, in line with the requirements of the EU Cosmetics Regulation and in accordance with the SCCS notes of guidance.
Collapse
Affiliation(s)
- P Daly
- Oriflame R&D Ltd, Bray Business Park, Kilruddery, Bray, Co Wicklow, Ireland
| | - G Moran
- Oriflame R&D Ltd, Bray Business Park, Kilruddery, Bray, Co Wicklow, Ireland
| |
Collapse
|
15
|
Gentile CL, Weir TL, Cox-York KA, Wei Y, Wang D, Reese L, Moran G, Estrada A, Mulligan C, Pagliassotti MJ, Foster MT. The role of visceral and subcutaneous adipose tissue fatty acid composition in liver pathophysiology associated with NAFLD. Adipocyte 2015; 4:101-12. [PMID: 26167414 DOI: 10.4161/21623945.2014.978662] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Revised: 10/10/2014] [Accepted: 10/15/2014] [Indexed: 11/19/2022] Open
Abstract
Visceral adiposity is associated with type-2-diabetes, inflammation, dyslipidemia and non-alcoholic fatty liver disease (NAFLD), whereas subcutaneous adiposity is not. We hypothesized that the link between visceral adiposity and liver pathophysiology involves inherent or diet-derived differences between visceral and subcutaneous adipose tissue to store and mobilize saturated fatty acids. The goal of the present study was to characterize the fatty acid composition of adipose tissue triglyceride and portal vein fatty acids in relation to indices of liver dysregulation. For 8 weeks rats had free access to control (CON; 12.9% corn/safflower oil; 3.6 Kcal/g), high saturated fat (SAT; 45.2% cocoa butter; 4.5 Kcal/g) or high polyunsaturated fat (PUFA; 45.2% safflower oil; 4.5 Kcal/g) diets. Outcome measures included glucose tolerance, visceral and subcutaneous adipose tissue triglyceride, liver phospholipids and plasma (portal and systemic) free fatty acid composition, indices of inflammation and endoplasmic reticulum stress in the liver and adipose tissue depots and circulating adipo/cytokines. Hepatic triglycerides were significantly increased in both high fat diet groups compared to control and were significantly higher in PUFA compared to SAT. Although glucose tolerance was not different among diet groups, SAT increased markers of inflammation and ER stress in the liver and both adipose tissue depots. Fatty acid composition did not differ among adipose depots or portal blood in any dietary group. Overall, these data suggest that diets enriched in saturated fatty acids are associated with liver inflammation, ER stress and injury, but that any link between visceral adipose tissue and these liver indices does not involve selective changes to fatty acid composition in this depot or the portal vein.
Collapse
|
16
|
Moran G, Wei Y, Wang D, Pagliassotti M. The role of mitofusin 2 in saturated fatty acid induced ER stress in H4IIE liver cells (1116.4). FASEB J 2014. [DOI: 10.1096/fasebj.28.1_supplement.1116.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- G. Moran
- Food Science & Human Nutrition Colorado State UniversityFort CollinsCOUnited States
| | - Y. Wei
- Food Science & Human Nutrition Colorado State UniversityFort CollinsCOUnited States
| | - D. Wang
- Food Science & Human Nutrition Colorado State UniversityFort CollinsCOUnited States
| | - M.J. Pagliassotti
- Food Science & Human Nutrition Colorado State UniversityFort CollinsCOUnited States
| |
Collapse
|
17
|
Terp S, Krishnadasan A, Bowen W, Joo J, Furoy D, Chan J, Moran G, Talan D. Introduction of Rapid Methicillin-Resistant Staphylococcus aureus Polymerase Chain Reaction Testing and Antibiotic Selection Among Hospitalized Patients With Purulent Skin Infections. Clin Infect Dis 2014; 58:e129-32. [DOI: 10.1093/cid/ciu039] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
|
18
|
Moran G, Folch H, Henriquez C, Ortloff A, Barria M. Reaginic antibodies from horses with Recurrent Airway Obstruction produce mast cell stimulation. Vet Res Commun 2012; 36:251-8. [DOI: 10.1007/s11259-012-9534-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/01/2012] [Indexed: 11/28/2022]
|
19
|
Bisceglia R, Jenkins JM, Wigg KG, O’Connor TG, Moran G, Barr CL. Arginine vasopressin 1a receptor gene and maternal behavior: evidence of association and moderation. Genes, Brain and Behavior 2012; 11:262-8. [DOI: 10.1111/j.1601-183x.2012.00769.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
20
|
Moran G. "Near famine": the Roman Catholic Church and the subsistence crisis of 1879-82. Stud Hibernica 2010; 32:155-177. [PMID: 20191701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
|
21
|
|
22
|
Scott T, Swan H, Moran G, Mondal T, Jones J, Guram K, Huff J. Increasing the Detection Rate of Normal Fetal Cardiac Structures: A Real-Time Approach. Journal of Diagnostic Medical Sonography 2008. [DOI: 10.1177/8756479308315234] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The purpose of this study was to determine if acquiring real-time sweeps of the fetal heart would be a more effective method of identifying normal cardiac structures compared with using static images during routine second-trimester obstetric sonograms. Subjects were scanned using three different techniques. The static image acquisition (protocol A) included three images of the fetal heart. Protocol B used two gray-scale sweeps through the fetal heart. Protocol C acquired three color loops of the fetal heart. The sweeps demonstrated a complete normal cardiac assessment in 71% of studies, compared with the static image and color Doppler techniques that completed a normal cardiac assessment in only 39% of studies, respectively. The real-time technique detected four chambers, the left ventricular outflow tract (LVOT), the right ventricular outflow tract (RVOT), the LVOT/RVOT crossover, and size and axis of the heart with a greater frequency than the static images and color loops in all cases. In addition, the real-time technique was able to demonstrate the pulmonary veins in 56% of cases compared with 3.6% for static images. The color Doppler acquisition demonstrated blood flow through the atrial-ventricular and semilunar valves in 86% of cases.
Collapse
Affiliation(s)
- Ted Scott
- Mohawk-McMaster Institute for Applied Health Sciences, Hamilton, Ontario, Canada,
| | - Hans Swan
- Charles Sturt University, Wagga Wagga, NSW, Australia
| | | | - Tapas Mondal
- McMaster Children's Hospital, Hamilton, Ontario, Canada
| | - Judy Jones
- London Health Sciences, London, Ontario, Canada
| | - Karm Guram
- McMaster University, Hamilton, Ontario, Canada
| | - Jaime Huff
- London Health Sciences, London, Ontario, Canada
| |
Collapse
|
23
|
Forbes LM, Evans EM, Moran G, Pederson DR. Change in Atypical Maternal Behavior Predicts Change in Attachment Disorganization From 12 to 24 Months in a High-Risk Sample. Child Dev 2007; 78:955-71. [PMID: 17517015 DOI: 10.1111/j.1467-8624.2007.01043.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This longitudinal study examined links between disorganization and atypical maternal behavior at 12 and 24 months in 71 adolescent mother-child dyads. Organized attachment and maternal not disrupted behavior were more stable than disorganization and disrupted behavior, respectively. At both ages, disorganization and maternal disrupted behavior were significantly correlated. Change in atypical maternal behavior predicted change in disorganization across time. The results provide substantial support for extant theories linking anomalous maternal behavior to the development of disorganized attachment. The Interesting-but-Scary paradigm, introduced in this study, promises to be a useful tool for assessing attachment and maternal behavior in toddlerhood.
Collapse
Affiliation(s)
- L M Forbes
- University of Western Ontario, London, ON, Canada.
| | | | | | | |
Collapse
|
24
|
Mothersill C, Moran G, McNeill F, Gow MD, Denbeigh J, Prestwich W, Seymour CB. A role for bioelectric effects in the induction of bystander signals by ionizing radiation? Dose Response 2007; 5:214-29. [PMID: 18648606 DOI: 10.2203/dose-response.06-011.mothersill] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
The induction of "bystander effects" i.e. effects in cells which have not received an ionizing radiation track, is now accepted but the mechanisms are not completely clear. Bystander effects following high and low LET radiation exposure are accepted but mechanisms are still not understood. There is some evidence for a physical component to the signal. This paper tests the hypothesis that bioelectric or biomagnetic phenomena are involved. Human immortalized skin keratinocytes and primary explants of mouse bladder and fish skin, were exposed directly to ionizing radiation or treated in a variety of bystander protocols. Exposure of cells was conducted by shielding one group of flasks using lead, to reduce the dose below the threshold of 2mGy (60)Cobalt gamma rays established for the bystander effect. The endpoint for the bystander effect in the reporter system used was reduction in cloning efficiency (RCE). The magnitude of the RCE was similar in shielded and unshielded flasks. When cells were placed in a Faraday cage the magnitude of the RCE was less but not eliminated. The results suggest that liquid media or cell-cell contact transmission of bystander factors may be only part of the bystander mechanism. Bioelectric or bio magnetic fields may have a role to play. To test this further, cells were placed in a Magnetic Resonance Imaging (MRI) machine for 10 min using a typical head scan protocol. This treatment also induced a bystander response. Apart from the obvious clinical relevance, the MRI results further suggest that bystander effects may be produced by non-ionizing exposures. It is concluded that bioelectric or magnetic effects may be involved in producing bystander signaling cascades commonly seen following ionizing radiation exposure.
Collapse
Affiliation(s)
- C Mothersill
- Department of Medical Physics and Applied Radiation Sciences, McMaster University, 660 Concession St., Hamilton, Ontario, Canada.
| | | | | | | | | | | | | |
Collapse
|
25
|
Borompichaichartkul C, Moran G, Srzednicki G, Price W. Nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) studies of corn at subzero temperatures. J FOOD ENG 2005. [DOI: 10.1016/j.jfoodeng.2004.07.018] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
26
|
Lastere S, Dalban C, Collin G, Descamps D, Girard PM, Clavel F, Costagliola D, Brun-Vezinet F, Brun-Vezinet F, Clavel F, Costagliola D, Dalban C, Girard PM, Matheron S, Meynard JL, Morand-Joubert L, Peytavin G, Vray M, Beguinot I, Waldner A, Beumont M, Semaille C, Bentata M, Berlureau P, Gérard L, Molina JM, Hor R, Bayol-Honnet G, Lascoux-Combe C, Drobacheff C, Hoen B, Dupon M, Lacut JY, Goujard C, Rousseau C, Vincent V, Diemer M, Lepeu G, Zerazhi H, de Truchis P, Berthé H, Jeantils V, Tazi CT, Vittecoq D, Escaut L, Dupont B, Nait-Ighil L, Rozenbaum W, Nguyen TH, Boué F, Galanaud P, Kazatchkine M, Piketty C, Bernasconi C, Salmon-Ceron D, Michon C, Chandemerle C, Lascaux AS, Magnier JD, Schneider L, Ait-Mohand H, Simon A, Herson S, Bollens D, Picard O, Tangre P, Bonarek M, Morlat P, Trépo C, Cotte L, Gastaut JA, Poizot-Martin I, Moran G, Masson S, Bennai Y, Belarbi L, Prevot MH, Fournier I, Reynes J, Baillat V, Raffi F, Esnault JL, Ceppi C, Cassuto JP, Arvieux C, Chapplain JM, Rey D, Krantz V, Besnier JM, Bastides F, Obadia M, Aquilina C, Bazin C, Verdon R, Piroth L, Grappin M, Sissoko D, Valette M, May T, Burty C, Debab Y, Caron F, Elharrar B, Launay O, Winter C, Chapuis L, Auperin I, Gilquin J. Impact of Insertions in the HIV-1 P6 Ptapp Region on the Virological Response to Amprenavir. Antivir Ther 2004. [DOI: 10.1177/135965350400900215] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We evaluated the impact of genetic changes within p6Gag gene on the virological response (VR, mean decrease in plasma viral load at week 12) to unboosted amprenavir (APV). Gag-protease fragments, including gag p2, p7, p1, p6 regions and whole protease (PR) were sequenced from baseline plasma specimens of 84 highly pre-treated but APV-naive patients included in the NARVAL (ANRS 088) trial. The correlation between baseline p6Gag polymorphism, PR mutations, baseline characteristics and VR to APV was analysed in univariate analysis. Insertions (P459Ins) within p6 protein, leading to partial or complete duplication of the PTAPP motif, were significantly associated with a decreased VR (P459Ins versus wild-type; –0.3 ±0.8 vs –1.1 ±1.2 log copies/ml, P=0.007) and were more frequent when the V82A/F/T/S PR mutation was present ( P=0.020). In multivariate analysis, after adjustment on the predictive factors of the VR in the NARVAL trial and on the PR mutations linked with response, there was a strong trend to an association ( P=0.058) between the presence of P459Ins and an altered VR. In conclusion, these results suggest that insertions in the p6 region of HIV-1 gag gene may affect the VR, in highly pre-treated patients receiving an unboosted APV-containing regimen.
Collapse
Affiliation(s)
| | - Stephane Lastere
- Laboratoire de Virologie, Hopital Bichat – Claude Bernard, Paris, France
| | - Cecile Dalban
- INSERM EMI0214, Universite Pierre et Marie Curie – Paris 6, Paris, France
| | - Gilles Collin
- Laboratoire de Virologie, Hopital Bichat – Claude Bernard, Paris, France
| | - Diane Descamps
- Laboratoire de Virologie, Hopital Bichat – Claude Bernard, Paris, France
| | - Pierre-Marie Girard
- Service des Maladies Infectieuses et Tropicales, Hopital Saint Antoine, Paris, France
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - R Hor
- Hôpital Saint-Louis, Paris
| | | | | | | | - B Hoen
- Hôpital Saint-Jacques, Besançon
| | | | | | - C Goujard
- Hôpital de Bicêtre, Le Kremlin Bicêtre
| | | | | | | | - G Lepeu
- Hôpital Henri Duffaut, Avignon
| | | | | | - H Berthé
- Hôpital Raymond Poincaré, Garches
| | | | | | | | | | - B Dupont
- Institut Pasteur/Hôpital Necker, Paris
| | | | | | | | - F Boué
- Hôpital Antoine Béclère, Clamart
| | | | | | - C Piketty
- Hôpital Européen Georges Pompidou, Paris
| | | | | | | | | | | | | | | | | | - A Simon
- Hôpital Pitié-Salpétrière, Paris
| | - S Herson
- Hôpital Pitié-Salpétrière, Paris
| | | | | | | | | | | | | | | | | | | | - G Moran
- Hôpital Bichat Claude Bernard, Paris
| | - S Masson
- Hôpital Bichat Claude Bernard, Paris
| | - Y Bennai
- Hôpital Bichat Claude Bernard, Paris
| | - L Belarbi
- Hôpital Bichat Claude Bernard, Paris
| | - MH Prevot
- Hôpital Bichat Claude Bernard, Paris
| | | | - J Reynes
- Hôpital Gui de Chauliac, Montpellier
| | - V Baillat
- Hôpital Gui de Chauliac, Montpellier
| | | | | | | | | | | | | | - D Rey
- Centre Hospitalier Universitaire, Strasbourg
| | - V Krantz
- Centre Hospitalier Universitaire, Strasbourg
| | | | | | | | | | - C Bazin
- Centre Hospitalier Universitaire de Caen
| | - R Verdon
- Centre Hospitalier Universitaire de Caen
| | | | | | - D Sissoko
- Centre Hospitalier Univeristaire, Tourcoing
| | - M Valette
- Centre Hospitalier Univeristaire, Tourcoing
| | - T May
- Hôpital de Brabois, Nancy
| | | | - Y Debab
- Hôpital Charles Nicolle, Rouen
| | - F Caron
- Hôpital Charles Nicolle, Rouen
| | - B Elharrar
- Centre Hospitalier Intercommunal, Créteil
| | - O Launay
- Centre Hospitalier Intercommunal, Créteil
| | - C Winter
- Hôpital André Grégoire, Montreuil
| | | | | | | |
Collapse
|
27
|
|
28
|
Pateman J, Daines G, Moran G, Thornton S, MacNaughtan A, Line M, Peatling G. Book reviews. Journal of Librarianship and Information Science 2001. [DOI: 10.1177/0961000014245053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
29
|
|
30
|
Abstract
Do siblings develop similar attachment relationships with their mother? Attachment theory suggests that brothers and sisters growing up in the same family are likely to relate in similar ways to their parents, at least when parental attachment representations and interactive styles remain stable across time. In the current study, sibling attachment data from three research groups (from Pennsylvania State University, Leiden University, and the University of Western Ontario) have been pooled to assemble a sufficiently large sample of observations (N = 138 sibling pairs) for a detailed comparison of sibling attachment relationships. Spacing between the births, differences in maternal sensitivity, and gender of siblings were examined as possible sources of concordance of nonconcordance. Attachment security (including disorganized attachment) of each sibling was assessed with the Strange Situation procedure between 12 and 14 months after birth. Maternal sensitivity was observed with the same rating scale in a laboratory play session in one of the studies and in home observations in the others. Sibling relationships were found to be significantly concordant when classified as secure/nonsecure (62% concordance, p < .01, 1-tailed, intraclass correlation = .23) but not when further subcategorized. Maternal insensitivity to both siblings (shared environment) was associated with concordance of sibling nonsecurity. Siblings of the same gender were more likely to form concordant relationships with their mother (68%; p < .01, 1-tailed, intraclass correlation = .37) than those of opposite gender. Same-sex sibling concordance was comparable to the concordance found for monozygotic twins in earlier studies. Genetic factors may, therefore, play a relatively small role in the development of attachment.
Collapse
Affiliation(s)
- M H van Ijzendoorn
- Center for Child and Family Studies, Leiden University, The Netherlands.
| | | | | | | | | | | |
Collapse
|
31
|
Abstract
Naturalistic assessment of maternal and infant interactive behavior using q-sorts has typically focused on rationally derived variables, such as maternal sensitivity and infant security. In the current study, behavior profiles characteristic of groups of young and adult mothers and their infants were derived empirically through q-factor analysis of the Maternal Behavior Q-sort (Version 3.0) and the Attachment Q-sort (Version 3.0). A three-factor solution best described the behavior profiles characteristic of young mothers. The identified factors were labeled: 'ignoring/neglecting versus interacting', 'accepting versus hostile/rejecting', and 'interfering'. The behavior of adult mothers was less variable and was described with only one factor, which corresponded to the 'accepting versus hostile/rejecting' factor. The factor solutions for infants of young and adult mothers were similar, with four identified factors, or behavioral profiles, discriminating between groups of infants with similar patterns of behavior: 'secure with mother', 'prefers visitor', 'socially withdrawn' and 'demanding with mother'. Infants of young and adult mothers differed with regard to their mean values on the first two identified factors. Results provide support for the relevance of rationally derived domains and criterion sorts in populations of both adult and young mothers, and suggest ways of progressing beyond the currently used, rationally derived variables in assessments of maternal and infant behavior in high- and low-risk populations.
Collapse
Affiliation(s)
- H N Bailey
- Department of Psychology, University of Western Ontario, London, Ontario, N6A 5C2, Canada.
| | | | | | | |
Collapse
|
32
|
Sullivan DJ, Moran G, Donnelly S, Gee S, Pinjon E, McCartan B, Shanley DB, Coleman DC. Candida dubliniensis: An update. Rev Iberoam Micol 1999; 16:72-76. [PMID: 18473572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023] Open
Affiliation(s)
- D J Sullivan
- Microbiology Research Laboratory, Department of Oral Pathology and Oral Medicine, School of Dental Science, University of Dublin, Trinity College, Dublin 2, Ireland.
| | | | | | | | | | | | | | | |
Collapse
|
33
|
Pederson DR, Gleason KE, Moran G, Bento S. Maternal attachment representations, maternal sensitivity, and the infant-mother attachment relationship. Dev Psychol 1999. [PMID: 9779739 DOI: 10.1037//0012-1649.34.5.925] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The role of maternal sensitivity as a mediator accounting for the robust association between maternal attachment representations and the quality of the infant-mother attachment relationship was examined. Sixty mother-infant dyads were observed at home and in the Strange Situation at 13 months, and mothers participated in the Adult Attachment Interview (AAI) within the next 6 months. A strong association was found between AAI and Strange Situation classifications, and autonomous mothers were more sensitive at home than were nonautonomous mothers. Mothers in secure relationships were more sensitive at home than mothers in nonsecure relationships. Likewise, infants in secure relationships were more secure as assessed by the Waters' Attachment Q sort than infants in nonsecure relationships. A test of the mediational model revealed that maternal sensitivity accounted for 17% of the relation between AAI and Strange Situation classifications.
Collapse
|
34
|
|
35
|
Abstract
The role of maternal sensitivity as a mediator accounting for the robust association between maternal attachment representations and the quality of the infant-mother attachment relationship was examined. Sixty mother-infant dyads were observed at home and in the Strange Situation at 13 months, and mothers participated in the Adult Attachment Interview (AAI) within the next 6 months. A strong association was found between AAI and Strange Situation classifications, and autonomous mothers were more sensitive at home than were nonautonomous mothers. Mothers in secure relationships were more sensitive at home than mothers in nonsecure relationships. Likewise, infants in secure relationships were more secure as assessed by the Waters' Attachment Q sort than infants in nonsecure relationships. A test of the mediational model revealed that maternal sensitivity accounted for 17% of the relation between AAI and Strange Situation classifications.
Collapse
|
36
|
Abstract
2H relaxation times T1, T1 rho and T2 for D2O in silica sol-gels are used to monitor porosity and surface interactions within the silica framework as a function of aging. Tetramethoxysilane gels are compared with composites containing low levels of poly(vinyl alcohol) (PVA) prepared under acidic conditions. Non-exponential decay of magnetisation in T1 rho and T2 experiments is attributed to the fractal nature of the pore structure.
Collapse
Affiliation(s)
- S Wonorahardjo
- School of Chemistry, University of New South Wales, Sydney, Australia
| | | | | | | |
Collapse
|
37
|
Henry G, Moran G, Jennings M. Outcome measurement for children with specific speech and language impairment. Int J Lang Commun Disord 1998; 33 Suppl:53. [PMID: 10343664 DOI: 10.3109/13682829809179395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Affiliation(s)
- G Henry
- Dawn House School, Rainworth, Notts
| | | | | |
Collapse
|
38
|
Affiliation(s)
- M. Rankothge
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
| | - J. Hook
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
| | - L. van Gorkom
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
| | - G. Moran
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
| |
Collapse
|
39
|
Abstract
Predictors of psychological distress/adjustment were examined in 25 patients following placement of ICDs. Patients completed a demographic questionnaire and a standardized questionnaire of psychological symptoms (i.e., Symptom Checklist-90 Revised; SCL-90-R). The number of discharges categorized by the patient as inappropriate and appropriate were also ascertained. The number of ICD discharges categorized as inappropriate and diminished levels of physical activity (r = 0.53 and 0.63, P < 0.01, respectively) did significantly relate to overall psychological distress. In addition, after controlling for age and prior psychiatric and physical health status through a stepwise multiple regression analysis, the occurrence of ICD discharges categorized as inappropriate and diminished physical activity continued to significantly predict overall psychological distress (R2 = 0.41, P < 0.01). However, the number of ICD discharges categorized as appropriate did not significantly predict overall psychological distress. The results of this investigation suggest that further refinement of the ICD could reduce the risk of exposure to potential psychological distress, and an analysis of prior and anticipated patient physical activity levels should be a factor when calibrating minimum ICD discharge threshold levels.
Collapse
Affiliation(s)
- E S Burgess
- Department of Psychiatry and Behavioral Medicine, Union Memorial Hospital, Baltimore, MD, USA
| | | | | | | | | |
Collapse
|
40
|
Coleman D, Sullivan D, Harrington B, Haynes K, Henman M, Shanley D, Bennett D, Moran G, McCreary C, O'Neill L. Molecular and phenotypic analysis of Candida dubliniensis: a recently identified species linked with oral candidosis in HIV-infected and AIDS patients. Oral Dis 1997; 3 Suppl 1:S96-101. [PMID: 9456666 DOI: 10.1111/j.1601-0825.1997.tb00384.x] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The discovery and characterisation of a novel species of Candida, termed Candida dubliniensis, associated with oral candidosis in HIV-infected individuals is described. These organisms share several phenotypic characteristics in common with Candida albicans and Candida stellatoidea, including the ability to produce germ tubes and chlamydospores. However, in contrast to these latter two species, C. dubliniensis isolates produce abundant chlamydospores, which are often arranged in contiguous pairs, triplets and other multiples suspended from a single suspensor cell. They belong to C. albicans serotype A and exhibit atypical substrate assimilation profiles. Genomic DNA fingerprinting analysis with the C. albicans-specific probe 27A and five different oligonucleotide probes consisting of short repeat sequence-containing motifs, demonstrated that C. dubliniensis has a distinct genomic organisation relative to C. albicans and C. stellatoidea. This was confirmed by karyotype analysis and random amplified polymorphic DNA (RAPD) analysis. Comparison of 500 bp of the V3 variable region of the large ribosomal subunit genes from 14 separate C. dubliniensis isolates and the corresponding sequences from C. albicans, C. stellatoidea, C. tropicalis, C. glabrata, C. parapsilosis, C. kefyr and C. krusei demonstrated that the C. dubliniensis isolates formed a homogenous cluster (100% similarity), representing a discrete taxon within the genus Candida that was significantly different from the other species analysed.
Collapse
Affiliation(s)
- D Coleman
- Department of Oral Medicine and Pathology, School of Dental Science, Trinity College, University of Dublin, Republic of Ireland
| | | | | | | | | | | | | | | | | | | |
Collapse
|
41
|
Abstract
OBJECTIVE To investigate the "toxic" total (potential for) hostility component of the type A behavior pattern (assessed by means of the structured interview) as it relates to prediction of restenosis after percutaneous transluminal coronary angioplasty (PTCA). DESIGN Patients with single vessel or multivessel coronary artery disease in whom PTCA had been scheduled or done were administered the structured interview by one trained interviewer prospectively or retrospectively (blinded to angiographic endpoints). MATERIAL AND METHODS A total of 41 patients underwent 53 initial balloon dilations on native arteries by 1 of 5 participating cardiologists. Inclusion criteria for this study were a successful initial PTCA and post-PTCA recatheterization if a patient complained of ischemic symptoms possibly related to restenosis. RESULTS Of the 41 patients, 15 (36.6%) had restenoses at a total of 18 previous angioplasty sites. Patients with high total (potential for) hostility ratings were almost 2.5 times more likely to have restenosis than those with low total (potential for) hostility scores (95% confidence interval = 1.03 to 5.32). Logistic regression revealed that total (potential for) hostility scores predicted post-PTCA restenosis overall as well as when adjusted for gender and race. Total (potential for) hostility scores were also positively associated with the number of arteries restenosed (P = 0.01). CONCLUSION This is the first report of type A total (potential for) hostility behavior conferring an increased risk for restenosis after PTCA. Its modification may be effective in reducing recurrent cardiac events. A coronary-prone behavior modification program for patients with persistent, same-site restenosis after PTCA has been initiated.
Collapse
Affiliation(s)
- M Goodman
- Department of Psychiatry and Behavioral Medicine, Union Memorial Hospital, Baltimore, Maryland, USA
| | | | | | | | | |
Collapse
|
42
|
Sullivan D, Haynes K, Moran G, Shanley D, Coleman D. Persistence, replacement, and microevolution of Cryptococcus neoformans strains in recurrent meningitis in AIDS patients. J Clin Microbiol 1996; 34:1739-44. [PMID: 8784580 PMCID: PMC229105 DOI: 10.1128/jcm.34.7.1739-1744.1996] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Six separate human immunodeficiency virus-positive patients with cryptococcal meningitis were each found to have been infected with a unique strain of Cryptococcus neoformans on the basis of genomic DNA finger-printing analysis with the microsatellite sequence-containing oligonucleotide probe (GGAT)4 and by random amplification of polymorphic DNA. Two patients (A and B) experienced a recurrent episode of infection. Between 12 and 16 single-colony isolates recovered from primary isolation media (> 50% of C. neoformans colonies recovered) from cerebrospinal fluid specimens were fingerprinted from both patients during each episode. The fingerprints of both isolate collections from patient B were very similar, although minor polymorphisms were evident in both sets of profiles. The fingerprints of the isolate collection from the initial episode of infection in patient A were also identical to each other, apart from minor polymorphisms, but they were clearly different from the corresponding profiles of the isolate collection from the recurrent episode, the latter of which were completely identical, apart from minor polymorphisms in a single isolate. Furthermore, prolonged storage and in vitro subculture of the isolates did not alter the fingerprint profiles. These results provided convincing evidence that patients A and B were each infected with a single C. neoformans strain during each episode of infection and that in patient B, the same strain persisted and caused both episodes, while in patient A, a different strain was responsible for each episode. The prevalence of polymorphisms in multiple single-colony isolates from both patients also suggested that C. neoformans populations may undergo microevolution.
Collapse
Affiliation(s)
- D Sullivan
- School of Dental Science, Department of Oral Medicine and Pathology, Trinity College, University of Dublin, Republic of Ireland
| | | | | | | | | |
Collapse
|
43
|
Pederson DR, Moran G. Expressions of the attachment relationship outside of the strange situation. Child Dev 1996; 67:915-27. [PMID: 8706535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
41 preterm infants and 38 full-term infants and their mothers were observed at home at 8 and 12 months of age and in the Strange Situation at 18 months in order to compare expressions of attachment relationships in these 2 settings. There was 84% concordance in the distinctions between secure and nonsecure classifications of the mother-infant relationship made at home at 12 months and in the Strange Situation. Classifications of avoidant relationships also displayed high concordance, but only 6 of the 15 dyads classified at home as ambivalent were classified in the same way in the Strange Situation. Mothers in secure relationships as assessed in the Strange Situation were rated as more sensitive at both 8 and 12 months than mothers in either avoidant or ambivalent relationships, whereas the sensitivity of mothers in these two nonsecure relationships did not differ significantly. Infants in secure relationships in the Strange Situation were characterized by more effective secure base behavior and more affective sharing and enjoyment of physical contact, and they were less fussy or difficult during the 12-month home observations.
Collapse
Affiliation(s)
- D R Pederson
- Department of Psychology, University of Western Ontario, London, Canada.
| | | |
Collapse
|
44
|
Gleason K, Pederson D, Moran G, Bento S. Maternal attachment cognitions in relation to maternal sensitivity and mother-infant attachment. Infant Behav Dev 1996. [DOI: 10.1016/s0163-6383(96)90532-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
45
|
Summanen PH, Talan DA, Strong C, McTeague M, Bennion R, Thompson JE, Väisänen ML, Moran G, Winer M, Finegold SM. Bacteriology of skin and soft-tissue infections: comparison of infections in intravenous drug users and individuals with no history of intravenous drug use. Clin Infect Dis 1995; 20 Suppl 2:S279-82. [PMID: 7548575 DOI: 10.1093/clinids/20.supplement_2.s279] [Citation(s) in RCA: 107] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
The bacteriology of cutaneous or subcutaneous abscesses (86 specimens) among intravenous drug users (IVDUs) was compared with the bacteriology of abscesses (74 specimens) in patients with no history of intravenous drug use (non-IVDUs). The IVDU abscesses yielded 173 aerobes and 131 anaerobes. Staphylococcus aureus was the most common aerobe isolated (50% of specimens yielded this isolate), followed by "Streptococcus milleri" (46%). The commonly encountered anaerobes were Fusobacterium nucleatum (17%), pigmented Prevotella species (22%), Peptostreptococcus micros (17%), Actinomyces odontolyticus (15%), and Veillonella species (13%). The non-IVDU isolates included 116 aerobes and 106 anaerobes. S. aureus was isolated from 53% of these specimens, followed by coagulase-negative staphylococci (19%), "S. milleri" (19%), and Streptococcus pyogenes (16%). The main groups of anaerobes were Peptostreptococcus species (35%), Bacteroides species (19%), and gram-positive bacilli (31%). Overall, 67% of the IVDU isolates were of oral origin, compared with 25% of the non-IVDU isolates. Of the specimens from IVDUs and non-IVDUs, 48% and 67%, respectively, yielded only aerobes, and 2% and 4%, respectively, yielded only anaerobes. Sixty-four percent of the patients had one or more beta-lactamase-producing organisms.
Collapse
Affiliation(s)
- P H Summanen
- Wadsworth Anaerobic Bacteriology Laboratory, Wadsworth Veterans Affairs Medical Center, Los Angeles, California 90073, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
46
|
Houle M, Kogon S, Moran G, McGrath P. Expectancy effects on analgesic effectiveness for experimental and clinical pain. Pharmacol Biochem Behav 1993. [DOI: 10.1016/0091-3057(93)90424-r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
47
|
Fonagy P, Steele M, Moran G, Steele H, Higgitt A. Measuring the ghost in the nursery: an empirical study of the relation between parents' mental representations of childhood experiences and their infants' security of attachment. J Am Psychoanal Assoc 1993; 41:957-89. [PMID: 8282943 DOI: 10.1177/000306519304100403] [Citation(s) in RCA: 199] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
This paper presents a summary of the Anna Freud Centre-University College London, Parent-Child Project. Its most important finding was that the security of the infants' relationship with both parents at 12 and 18 months could be predicted on the basis of qualitative aspects of the parents' accounts of their own childhoods collected before the birth of the child. This confirmed Selma Fraiberg's observations concerning the reemergence of childhood conflicts at early stages of childbearing. Possible mechanisms mediating this link are explored with particular reference to the role of the parents' accurate mental representations of the infants' mental world.
Collapse
|
48
|
Falconer IR, Dornbusch M, Moran G, Yeung SK. Effect of the cyanobacterial (blue-green algal) toxins from Microcystis aeruginosa on isolated enterocytes from the chicken small intestine. Toxicon 1992; 30:790-3. [PMID: 1509499 DOI: 10.1016/0041-0101(92)90016-x] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Livestock deaths, and clinical reports of human injury, follow the consumption of toxic blue-green algae. The experiments described show that isolated intestinal enterocytes from chicks are both deformed and killed by exposure to Microcystis toxins, in a dose-dependent and time-dependent manner. The enterocytes were protected from toxicity by deoxycholate, bromosulphothalein and rifampicin. It was concluded that the gastroenteritis clinically associated with accidental Microcystis ingestion is likely to reflect enterocyte injury by Microcystis toxins, and that the therapeutic use of bile acids or transport inhibitors may be of value in treatment.
Collapse
Affiliation(s)
- I R Falconer
- Department of Biochemistry, Microbiology and Nutrition, University of New England, Armidale NSW, Australia
| | | | | | | |
Collapse
|
49
|
Abstract
The study compared two equivalent groups of 11 diabetic children with grossly abnormal blood glucose profiles necessitating repeated admissions to a hospital. Patients in the treatment group were offered an intensive inpatient treatment program including psychoanalytic psychotherapy three to four times a week, which took place on the hospital ward and lasted an average of 15 weeks. The intervention was highly effective in improving the diabetic control of the children, and this was maintained at a 1 year follow-up. Patients in the comparison group, who were offered only inpatient medical intervention, returned to their prehospitalization level of metabolic control within a period of 3 months from discharge.
Collapse
Affiliation(s)
- G Moran
- Anna Freud Centre, London, and at the Department of Psychology, University College, London
| | | | | | | | | |
Collapse
|
50
|
Abstract
Childhood disturbances can best be studied in a developmental frame of reference. Following Anna Freud, the authors distinguish between outcome aims and intermediary aims. They present the analyses of a child and an adolescent to demonstrate how these aims affect the nature and progression of treatment.
Collapse
|