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Mannion AF, Elfering A, Fekete TF, Harding IJ, Monticone M, Obid P, Niemeyer T, Liljenqvist U, Boss A, Zimmermann L, Vila-Casademunt A, Sánchez Pérez-Grueso FJ, Pizones J, Pellisé F, Richner-Wunderlin S, Kleinstück FS, Obeid I, Boissiere L, Alanay A, Bagó J. Shorter and sweeter: the 16-item version of the SRS questionnaire shows better structural validity than the 20-item version in young patients with spinal deformity. Spine Deform 2022; 10:1055-1062. [PMID: 35476321 DOI: 10.1007/s43390-022-00509-5] [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] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Accepted: 04/02/2022] [Indexed: 11/25/2022]
Abstract
PURPOSE In patients with adult spinal deformity, it was previously shown that 16 of the non-management items of the SRS-instrument showed a better fit to the theoretical four-factor model (pain, function, self-image, mental health) than did all 20 items. Whether the same phenomenon is observed in data from younger (< 20y) patients, for whom the questionnaire was originally designed, is not currently known. METHODS Confirmatory factor analysis was used to evaluate the factor structure of the 20 non-management items of the SRS-instrument completed by 3618 young patients with spinal deformity (75.5% female; mean age, 15.0 ± 2.0 years) and of its equivalence across language versions (2713 English-speaking, 270 Spanish, 264 German, 223 Italian, and 148 French). The root mean square error of approximation (RMSEA) and comparative fit index (CFI) indicated model fit. RESULTS Compared with the 20-item version, the 16-item solution significantly increased the fit (p < 0.001) across all language versions, to achieve good model fit (CFI = 0.96, RMSEA = 0.06). For both 16-item and 20-item models, equivalence across languages was not reached, with some items showing weaker item-loading for some languages, in particular German and French. CONCLUSION In patients with adolescent idiopathic scoliosis, the shorter 16-item version showed a better fit to the intended 4-factor structure of the SRS-instrument. The wording of some of the items, and/or their equivalence across language versions, may need to be addressed. Questionnaire completion can be a burden for patients; if a shorter, more structurally valid version is available, its use should be encouraged.
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Affiliation(s)
- A F Mannion
- Department Teaching, Research and Development, Spine Subdivision, Schulthess Klinik, Lengghalde 2, 8008, Zürich, Switzerland.
| | - A Elfering
- Institute of Psychology, University of Bern, Bern, Switzerland
| | - T F Fekete
- Spine Centre, Schulthess Klinik, Zürich, Switzerland
| | | | - M Monticone
- Department Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy
| | - P Obid
- Dept. of Orthopaedics and Orthopaedic Surgery, Greifswald, University Hospital, Ferdinand-Sauerbruch-Strasse, Greifswald, 17475, Germany
| | - T Niemeyer
- Spine and Scoliosis Center, Asklepios Paulinen Klinik Wiesbaden, Wiesbaden, Germany
| | - U Liljenqvist
- Department Spine Surgery, St Franziskus Hospital, Münster, Germany
| | - A Boss
- Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland
| | - L Zimmermann
- Department Teaching, Research and Development, Spine Subdivision, Schulthess Klinik, Lengghalde 2, 8008, Zürich, Switzerland
| | - A Vila-Casademunt
- Spine Research Unit, Vall d'Hebron Institute of Research, Barcelona, Spain
| | | | - J Pizones
- Spine Unit, Department of Orthopedic Surgery, University Hospital La Paz, Madrid, Spain
| | - F Pellisé
- Spine Unit, Hospital Vall d'Hebron, Barcelona, Spain
| | - S Richner-Wunderlin
- Department Teaching, Research and Development, Spine Subdivision, Schulthess Klinik, Lengghalde 2, 8008, Zürich, Switzerland
| | | | - I Obeid
- Spine Surgery Unit, Pellegrin University Hospital, Bordeaux, France
| | - L Boissiere
- Spine Surgery Unit, Pellegrin University Hospital, Bordeaux, France
| | - A Alanay
- Dept. Orthopedics and Traumatology, Acibadem Mehmet Ali Aydinlar University, Istanbul, Turkey
| | - J Bagó
- Spine Research Unit, Vall d'Hebron Institute of Research, Barcelona, Spain
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Marcon M, Becker AS, Ulbrich EJ, Frauenfelder T, Boss A. Water-fat Dixon sequences in the evaluation of breast implants: proposal of a time effective rapid approach in the clinical practice. Clin Radiol 2017; 72:799.e9-799.e15. [PMID: 28438322 DOI: 10.1016/j.crad.2017.03.020] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2016] [Revised: 01/26/2017] [Accepted: 03/21/2017] [Indexed: 10/19/2022]
Abstract
AIM To evaluate the diagnostic accuracy achieved from a fat-water Dixon sequence alone compared to a combination of a silicone-specific magnetic resonance imaging (MRI) sequence and a water-specific MRI sequence in the assessment of breast implants. MATERIALS AND METHODS In this institutional review board (IRB)-approved study the integrity of breast implants was assessed retrospectively in 27 patients undergoing breast MRI at 3 T. A qualitative evaluation of (set 1) a silicon-selective water-saturated short tau inversion recovery (STIR) sequence in combination with a water-only Dixon dataset (total acquisition time 7 minutes 17 seconds), and of (set 2) fat-only and water-only Dixon datasets (4 minutes 8 seconds) was performed by two readers independently evaluating the following features: margin definition of the implant, water suppression homogeneity, image quality, presence of artefacts and their effects on the imaging interpretation, and diagnostic confidence. Diagnostic accuracy in implant rupture detection was determined and either surgical confirmation or diagnosis from the radiological report was used as a standard of reference. RESULTS In both sequences, margin definition of the implant wall, water suppression homogeneity, and overall image quality were rated good-excellent in most of cases. Water suppression homogeneity was moderate-poor in a greater number of cases in set 1. Movement artefacts were more frequent in set 1 whereas five cases (18.5%) exhibited swap artefacts between silicone and water in set 2. Diagnostic confidence was rated high-very high with both sequences in most of cases. Diagnostic accuracy was 100% for both readers using set 1 and 96.2% and 100% using set 2. CONCLUSION A single Dixon sequence allows an accurate diagnostic evaluation of breast implants and concomitant shortening of the overall acquisition time.
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Affiliation(s)
- M Marcon
- Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Switzerland.
| | - A S Becker
- Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Switzerland
| | - E J Ulbrich
- Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Switzerland
| | - T Frauenfelder
- Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Switzerland
| | - A Boss
- Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Switzerland
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Rüppel D, Dahmen R, Boss A, Jäger R, Grant M, Baughman R, Klabunde T. A Population Dose-Response Model for Inhaled Technosphere Insulin Administered to Healthy Subjects. CPT Pharmacometrics Syst Pharmacol 2017; 6:365-372. [PMID: 28568813 PMCID: PMC5488128 DOI: 10.1002/psp4.12189] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Revised: 01/24/2017] [Accepted: 02/16/2017] [Indexed: 11/30/2022]
Abstract
Technosphere insulin (TI), an inhaled insulin with a fast onset of action, provides a novel option for the control of prandial glucose. A euglycemic glucose clamp study was performed to compare the effects of TI and regular human insulin (RHI) on the induced glucose infusion rate (GIR) in healthy volunteers. Generation of a dose–response relationship between insulin dose and effect (expressed as AUC of GIR) was not possible from the clinical data directly. The GIR recording time was too short to capture the full effect and higher doses were not tested. Thus, a pharmacokinetic‐GIR model was developed to simulate GIR for a sufficient time window of 20 h and for higher doses. A dose–response model was then generated from the simulated GIR profiles. The resulting model provides an ED50 for TI that is 5‐fold higher than for RHI, a ratio that can be used as conversion factor for equivalent doses of RHI and TI.
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Affiliation(s)
- D Rüppel
- Sanofi-Aventis Deutschland GmbH, R&D Frankfurt, Germany
| | - R Dahmen
- Sanofi-Aventis Deutschland GmbH, R&D Frankfurt, Germany
| | - A Boss
- Sanofi US, Bridgewater, New Jersey, USA
| | - R Jäger
- Sanofi-Aventis Deutschland GmbH, R&D Frankfurt, Germany
| | - M Grant
- MannKind Corporation, Danbury, Connecticut, USA
| | - R Baughman
- MannKind Corporation, Danbury, Connecticut, USA
| | - T Klabunde
- Sanofi-Aventis Deutschland GmbH, R&D Frankfurt, Germany
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Jungraithmayr W, Yamada Y, Windirsch K, Kenkel D, Inci I, Boss A, Weder W. Chronic rejection in orthotopic mouse lung Transplantation models – an experimental reappraisal. Zentralbl Chir 2016. [DOI: 10.1055/s-0036-1587567] [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: 10/21/2022]
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Kenkel D, Wurnig M, Filli L, Ulbrich E, Runge V, Beck T, Boss A. Whole-Body Diffusion Imaging Applying Simultaneous Multi-Slice Excitation. ROFO-FORTSCHR RONTG 2016; 188:E1. [DOI: 10.1055/s-0035-1567082] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- D. Kenkel
- Department of Diagnostic and Interventional Radiology, University Hospital Zurich, Switzerland
| | - M. Wurnig
- Department of Diagnostic and Interventional Radiology, University Hospital Zurich, Switzerland
| | - L. Filli
- Department of Diagnostic and Interventional Radiology, University Hospital Zurich, Switzerland
| | - E. Ulbrich
- Department of Diagnostic and Interventional Radiology, University Hospital Zurich, Switzerland
| | - V. Runge
- Department of Neuroradiology, University Hospital Zurich, Switzerland
| | - T. Beck
- Siemens Healthcare GmbH, Erlangen, Germany
| | - A. Boss
- Department of Diagnostic and Interventional Radiology, University Hospital Zurich, Switzerland
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Kenkel D, Wurnig MC, Filli L, Ulbrich EJ, Runge VM, Beck T, Boss A. Whole-Body Diffusion Imaging Applying Simultaneous Multi-Slice Excitation. ROFO-FORTSCHR RONTG 2016; 188:381-8. [PMID: 26815283 DOI: 10.1055/s-0035-1567032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
PURPOSE The purpose of this study was to examine the feasibility of a fast protocol for whole-body diffusion-weighted imaging (WB-DWI) using a slice-accelerated echo-planar sequence, which, when using comparable image acquisition parameters, noticeably reduces measurement time compared to a conventional WB-DWI protocol. MATERIALS AND METHODS A single-shot echo-planar imaging sequence capable of simultaneous slice excitation and acquisition was optimized for WB-DWI on a 3 T MR scanner, with a comparable conventional WB-DWI protocol serving as the reference standard. Eight healthy individuals and one oncologic patient underwent WB-DWI. Quantitative analysis was carried out by measuring the apparent diffusion coefficient (ADC) and its coefficient of variation (CV) in different organs. Image quality was assessed qualitatively by two independent radiologists using a 4-point Likert scale. RESULTS Using our proposed protocol, the scan time of the WB-DWI measurement was reduced by up to 25.9 %. Both protocols, the slice-accelerated protocol and the conventional protocol, showed comparable image quality without statistically significant differences in the reader scores. Similarly, no significant differences of the ADC values of parenchymal organs were found, whereas ADC values of brain tissue were slightly higher in the slice-accelerated protocol. CONCLUSION It was demonstrated that slice-accelerated DWI can be applied to WB-DWI protocols with the potential to greatly reduce the required measurement time, thereby substantially increasing clinical applicability. KEY POINTS •Whole-body diffusion-weighted imaging (WB-DWI) using simultaneous multi-slice and blipped-CAIPIRINHA reduces the measurement time strongly without having a significant impact on image quality. •The reduction in measurement time might strongly contribute to the clinical applicability of WB-DWI. •However, further refinement of the slice-accelerated EPI sequence, and the WB-DWI protocol applying this sequence type seems necessary; and the value of such WB-DWI protocols for assessment of systemic oncological diseases needs to be investigated in further clinical studies.
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Affiliation(s)
- D Kenkel
- Department of Diagnostic and Interventional Radiology, University Hospital Zurich, Switzerland
| | - M C Wurnig
- Department of Diagnostic and Interventional Radiology, University Hospital Zurich, Switzerland
| | - L Filli
- Department of Diagnostic and Interventional Radiology, University Hospital Zurich, Switzerland
| | - E J Ulbrich
- Department of Diagnostic and Interventional Radiology, University Hospital Zurich, Switzerland
| | - V M Runge
- Department of Neuroradiology, University Hospital Zurich, Switzerland
| | - T Beck
- Siemens Healthcare GmbH, Erlangen, Germany
| | - A Boss
- Department of Diagnostic and Interventional Radiology, University Hospital Zurich, Switzerland
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Bickelhaupt S, Wurnig MC, Lesurtel M, Patak MA, Boss A. Quantitative in vivo analysis of small bowel motility using MRI examinations in mice--proof of concept study. Lab Anim 2015; 49:57-64. [PMID: 25266965 DOI: 10.1177/0023677214553321] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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] [Indexed: 12/19/2022]
Abstract
Small bowel motility analyses using magnetic resonance imaging (MRI) could reduce current invasive techniques in animal studies and comply with the 'three Rs' rule for human animal experimentation. Thus we investigated the feasibility of in vivo small bowel motility analyses in mice using dynamic MRI acquisitions. All experimental procedures were approved by the institutional animal care committee. Six C57BL/6 mice underwent MRI without additional preparation after isoflurane anaesthetization in the prone position on a 4.7 T small animal imager equipped with a linear polarized hydrogen birdcage whole-body mouse coil. Motility was assessed using a true fast imaging in a steady precession sequence in the coronal orientation (acquisition time per slice 512 ms, in-plane resolution 234 × 234 µm, matrix size 128 × 128, slice thickness 1 mm) over 30 s corresponding to 60 acquisitions. Motility was manually assessed measuring the small bowel diameter change over time. The resulting motility curves were analysed for the following parameters: contraction frequency per minute (cpm), maximal contraction amplitude (maximum to minimum [mm]), luminal diameter (mm) and luminal occlusion rate. Small bowel motility quantification was found to be possible in all animals with a mean small bowel contraction frequency of 10.67 cpm (SD ± 3.84), a mean amplitude of the contractions of 1.33 mm (SD ± 0.43) and a mean luminal diameter of 1.37 mm (SD ± 0.42). The mean luminal occlusion rate was 1.044 (SD ± 0.45%/100). The mean duration needed for a single motility assessment was 185 s (SD ± 54.02). Thus our study demonstrated the feasibility of an easy and time-sparing functional assessment for in vivo small bowel motility analyses in mice. This could improve the development of small animal models of intestinal diseases and provide a method similar to clinical MR examinations that is in concordance with the 'three Rs' for humane animal experimentation.
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Affiliation(s)
- S Bickelhaupt
- Department of Radiology, University Hospital Zürich, Zürich, Switzerland Department of Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - M C Wurnig
- Department of Radiology, University Hospital Zürich, Zürich, Switzerland
| | - M Lesurtel
- Department of Surgery, University Hospital Zürich, Zürich, Switzerland
| | - M A Patak
- Department of Radiology, University Hospital Zürich, Zürich, Switzerland Institute of Radiology, Hirslanden Clinics Zürich, Zürich, Switzerland
| | - A Boss
- Department of Radiology, University Hospital Zürich, Zürich, Switzerland
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Machado ACZ, Dorigo OF, Boss A, Tironi P. First Report of Meloidogyne javanica Parasitizing Duboisia sp. in Paraná State, Brazil. Plant Dis 2014; 98:1745. [PMID: 30703916 DOI: 10.1094/pdis-06-14-0649-pdn] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Duboisia sp. is a small tree belonging to the family Solanaceae originating from the rainforest areas of the eastern coast of Australia. Dried leaves are used for the extraction of pharmaceutical alkaloids, making this a commercially viable crop. The root-knot nematode Meloidogyne incognita has been reported parasitizing Duboisia myoporoides (5); however, no information of other root-knot nematode species associated with this plant was found. Duboisia sp. is cultivated at Solana Farm, near Arapongas (23°25'08″ S, 51°25'26″ W), Paraná State, Brazil. During the renovation of a production field in this municipality, galled roots were observed on plants and samples were submitted to the Nematology Laboratory at Instituto Agronômico do Paraná, IAPAR, on December 2013. Plants did not exhibit any above-ground symptoms. The specimens were identified through perineal patterns and esterase phenotypes of 20 adult females extracted from dissected roots (2,3) and morphometrics of 10 second-stage juveniles extracted from roots using the blender-sieving method (1). Morphological characteristics were consistent with those described for M. javanica (4). Females had rounded perineal patterns with low, trapezoid shape dorsal arch, striae smooth interrupted by a pair of incisures on both sides, corresponding to lateral fields, clearly demarcated from striae by more or less parallel lines, tail whorl often distinct (4). The juvenile mean body length was 459.9 ± 28.7 μm and tail length averaged 51.6 ± 5.1 μm, with 10 to 16 μm long hyaline region and finely rounded tail tip (4). Results from the esterase electrophoresis were typical of M. javanica (2) with the J3 (Rm = 1.0, 1.3, and 1.4) phenotype being obtained. To our knowledge, this is the first report of M. javanica on Duboisia sp. in Brazil. This finding has great importance for Brazilian production since this nematode may damage plants, reduce yields, and control of this nematode on Duboisia sp. is difficult (5). Additional work is necessary in order to elucidate the losses caused by M. javanica on Duboisia sp. References: (1) J. I. Bonetti and S. Ferraz. Fitopatol. Bras. 6:533, 1981. (2) P. R. Esbenshade and A. C. Triantaphyllou. J. Nematol. 22:10, 1990. (3) K. M. Hartman and J. N. Sasser. Page 115 in: An Advanced Treatise on Meloidogyne. Volume II Methodology. K. R. Barker et al., eds. North Carolina State University Graphics, Raleigh, 1985. (4) D. J. Hunt and Z. A. Handoo. Page 55 in: Root-Knot Nematodes. R. N. Perry et al., eds. CABI International, Wallingford, UK, 2010. (5) A. M. Mello et al. Nematol. Bras. 22(2):12, 1998.
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Affiliation(s)
- A C Z Machado
- Instituto Agronômico do Paraná, 86047-902, Londrina, PR, Brazil
| | - O F Dorigo
- Instituto Agronômico do Paraná, 86047-902, Londrina, PR, Brazil
| | - A Boss
- ADAMA Agricultural Solutions, 86031-610, Londrina, PR, Brazil
| | - P Tironi
- Solana Agropecuária LTDA, 86700-970, Arapongas, PR, Brazil
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Boss A, Martirosian P, Fuchs J, Obermayer F, Tsiflikas I, Schick F, Schäfer JF. Dynamic MR urography in children with uropathic disease with a combined 2D and 3D acquisition protocol--comparison with MAG3 scintigraphy. Br J Radiol 2014; 87:20140426. [PMID: 25270833 DOI: 10.1259/bjr.20140426] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE The aim of this study was to evaluate combined two-dimensional (2D) and three-dimensional (3D) dynamic MR urography with respiratory compensation in children with anomalies of the genitourinary tract, allowing for computation of split renal function and assessment of urinary tract obstruction. METHODS Dynamic MR urography was performed in 53 children (3 months-16 years of age) with anomalies of the urinary tract. A protocol for dynamic MR urography and nephrography was implemented at 1.5 T using a navigator-triggered 2D TurboFLASH sequence. Split renal function and contrast-medium excretion were assessed after the bolus injection of 0.05 mmol kg(-1) body weight of gadolinium dimeglumine. In the excretory phase, a 3D gradient-echo data set with high spatial resolution was acquired. In all patients, mercaptoacetyltriglycine (MAG3) scintigraphy was obtained as a reference standard. RESULTS In all children, dynamic MR nephrography and urography could be performed with excellent compensation of breathing artefacts providing region of interest analysis in nearly identical kidney positions. The assessment of contrast-medium excretion into the ureter allowed for discrimination of functional from non-functional stenosis. Split renal function assessed by MRI showed an excellent agreement with the MAG3 reference standard with a correlation coefficient r = 0.95. Additionally recorded 3D data sets offered good depiction of anatomical anomalies in all patients. CONCLUSION The proposed protocol provides a robust technique for assessment of ureteral obstruction and split renal function with compensation of breathing artefacts, short post-processing time and excellent 3D spatial resolution. ADVANCES IN KNOWLEDGE The combined protocol of 2D and 3D MR urography is an efficient technique for assessment of renal morphology and function.
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Affiliation(s)
- A Boss
- 1 Department of Diagnostic and Interventional Radiology, University Hospital of Zürich, Zurich, Switzerland
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Meerang M, Boss A, Felley-Bosco E, Lauk O, Arni S, Bitanihirwe B, Stahel R, Weder W, Opitz I. F-052 * EVALUATION OF TUMOUR IMAGING TECHNIQUES FOR MALIGNANT PLEURAL MESOTHELIOMA ORTHOTOPIC RAT MODEL. Interact Cardiovasc Thorac Surg 2014. [DOI: 10.1093/icvts/ivu167.52] [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: 11/13/2022] Open
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Naros G, Rossi C, Boss A, Schick F, Tatagiba M, Ebner F, Klose U. Diffusion tensor imaging coefficients correlate with electrophysiological recordings in intramedullary neoplasms of the human cervical spinal cord. KLIN NEUROPHYSIOL 2014. [DOI: 10.1055/s-0034-1371272] [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: 10/25/2022]
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Tsushima Y, Wurnig M, Jang JJ, Boss A, Weder W, Jungraithmayr W. P-218ASSESSMENT OF ISCHAEMIA REPERFUSION INJURY BY MICRO-COMPUTED TOMOGRAPHY AND ULTRA-SHORT ECHO-TIME MAGNETIC RESONANCE IMAGING AFTER MOUSE LUNG TRANSPLANTATION. Interact Cardiovasc Thorac Surg 2013. [DOI: 10.1093/icvts/ivt288.218] [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: 11/14/2022] Open
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Bickelhaupt S, Pazahr S, Chuck N, Blume I, Froehlich JM, Cattin R, Raible S, Bouquet H, Bill U, Rogler G, Frei P, Boss A, Patak MA. Crohn's disease: small bowel motility impairment correlates with inflammatory-related markers C-reactive protein and calprotectin. Neurogastroenterol Motil 2013; 25:467-73. [PMID: 23495824 DOI: 10.1111/nmo.12088] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2012] [Accepted: 01/01/2013] [Indexed: 02/02/2023]
Abstract
BACKGROUND To evaluate the correlation between the levels of C-reactive protein (CRP), calprotectin, and small bowel motility in patients with Crohn's disease assessed with MRI. METHODS This prospective institutional review board approved study included magnetic resonance imaging enterography (MRE) and analyses of inflammatory markers in blood (C-reactive protein) and feces (calprotectin). For cine MRE, a coronal 2D-T2w sequence was used on a 1.5 T MRI system. Small bowel motility was analyzed in 13 patients using dedicated magnetic resonance MR-motility assessment software (Motasso). Contraction frequency, amplitude, amplitude diameter ratio, and luminal diameter were determined as well as the blood levels of CRP (mg L(-1) ) and fecal levels of calprotectin (ug g(-1) ). Statistics were calculated using Pearson's correlation coefficient. KEY RESULTS A significant inverse linear correlation was found between the contraction frequency and both the level of CRP (r = -0.701, P = 0.008) and calprotectin (r = -0.805, P = 0.001). Dilatation of small bowel diameter significantly correlated with calprotectin levels (r = 0.857, P =< 0.001) but not with CRP (r = 0.447, P = 0.126). The absolute amplitude of the contractions did not correlate neither with the level of CRP (r = -0.527, P = 0.064) nor with calprotectin (r = -0.612, P = 0.026). The ratio describing the contraction amplitude relatively to the individual luminal diameter significantly correlated with calprotectin (r = 0.736, P = 0.004) and with CRP (r = 0.577, P = 0.039). CONCLUSIONS & INFERENCES Alterations of small bowel motility during CD flares significantly correlate with the level of calprotectin and CRP indicating that they represent inflammatory activity.
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Affiliation(s)
- S Bickelhaupt
- Department of Radiology, University Hospital Zürich, Rämistrasse 100, Zürich, Switzerland
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Lecoultre V, Egli L, Carrel G, Theytaz F, Kreis R, Schneiter P, Boss A, Zwygart K, Lê KA, Bortolotti M, Boesch C, Tappy L. Effects of fructose and glucose overfeeding on hepatic insulin sensitivity and intrahepatic lipids in healthy humans. Obesity (Silver Spring) 2013; 21:782-5. [PMID: 23512506 DOI: 10.1002/oby.20377] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.9] [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] [Received: 10/08/2012] [Accepted: 01/07/2013] [Indexed: 11/09/2022]
Abstract
OBJECTIVE To assess how intrahepatic fat and insulin resistance relate to daily fructose and energy intake during short-term overfeeding in healthy subjects. DESIGN AND METHODS The analysis of the data collected in several studies in which fasting hepatic glucose production (HGP), hepatic insulin sensitivity index (HISI), and intrahepatocellular lipids (IHCL) had been measured after both 6-7 days on a weight-maintenance diet (control, C; n = 55) and 6-7 days of overfeeding with 1.5 (F1.5, n = 7), 3 (F3, n = 17), or 4 g fructose/kg/day (F4, n = 10), with 3 g glucose/kg/day (G3, n = 11), or with 30% excess energy as saturated fat (fat30%, n = 10). RESULTS F3, F4, G3, and fat30% all significantly increased IHCL, respectively by 113 ± 86, 102 ± 115, 59 ± 92, and 90 ± 74% as compared to C (all P < 0.05). F4 and G3 increased HGP by 16 ± 10 and 8 ± 11% (both P < 0.05), and F3 and F4 significantly decreased HISI by 20 ± 22 and 19 ± 14% (both P < 0.01). In contrast, there was no significant effect of fat30% on HGP or HISI. CONCLUSIONS Short-term overfeeding with fructose or glucose decreases hepatic insulin sensitivity and increases hepatic fat content. This indicates short-term regulation of hepatic glucose metabolism by simple carbohydrates.
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Affiliation(s)
- V Lecoultre
- Department of Physiology, Faculty of Biology and Medicine, Lausanne University, Lausanne Switzerland
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Würslin C, Schmidt H, Martirosian P, Brendle C, Boss A, Claussen CD, Schwenzer NF, Stegger L. MR-basierte Korrektur der Atembewegung bei simultan akquirierten in-vivo PET-Daten des Körperstamms. ROFO-FORTSCHR RONTG 2012. [DOI: 10.1055/s-0032-1329790] [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: 10/27/2022]
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Schäfer JF, Tsiflikas I, Boss A, Szavay P, Obermayer F, Teufel M, Fleischer S, Claussen CD. Dynamische Kontrastmittel verstärkte Magnetresonanz-Urographie zur funktionellen Nierendiagnostik bei Kindern mit Doppelnieren im Vergleich zur MAG3 Szintigraphie. ROFO-FORTSCHR RONTG 2012. [DOI: 10.1055/s-0032-1311028] [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: 10/28/2022]
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Schwenzer NF, Stegger L, Bisdas S, Schraml C, Kolb A, Boss A, Müller M, Reimold M, Ernemann U, Claussen CD, Pfannenberg C, Schmidt H. Simultaneous PET/MR imaging in a human brain PET/MR system in 50 patients--current state of image quality. Eur J Radiol 2012; 81:3472-8. [PMID: 22260898 DOI: 10.1016/j.ejrad.2011.12.027] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2011] [Revised: 12/14/2011] [Accepted: 12/15/2011] [Indexed: 11/26/2022]
Abstract
OBJECTIVES The present work illustrates the current state of image quality and diagnostic accuracy in a new hybrid BrainPET/MR. MATERIALS AND METHODS 50 patients with intracranial masses, head and upper neck tumors or neurodegenerative diseases were examined with a hybrid BrainPET/MR consisting of a conventional 3T MR system and an MR-compatible PET insert. Directly before PET/MR, all patients underwent a PET/CT examination with either [18F]-FDG, [11C]-methionine or [68Ga]-DOTATOC. In addition to anatomical MR scans, functional sequences were performed including diffusion tensor imaging (DTI), arterial spin labeling (ASL) and proton-spectroscopy. Image quality score of MR imaging was evaluated using a 4-point-scale. PET data quality was assessed by evaluating FDG-uptake and tumor delineation with [11C]-methionine and [68Ga]-DOTATOC. FDG uptake quantification accuracy was evaluated by means of ROI analysis (right and left frontal and temporo-occipital lobes). The asymmetry indices and ratios between frontal and occipital ROIs were compared. RESULTS In 45/50 patients, PET/MR examination was successful. Visual analysis revealed a diagnostic image quality of anatomical MR imaging (mean quality score T2 FSE: 1.27±0.54; FLAIR: 1.38±0.61). ASL and proton-spectroscopy was possible in all cases. In DTI, dental artifacts lead to one non-diagnostic dataset (mean quality score DTI: 1.32±0.69; ASL: 1.10±0.31). PET datasets of PET/MR and PET/CT offered comparable tumor delineation with [11C]-methionine; additional lesions were found in 2/8 [(68)Ga]-DOTATOC-PET in the PET/MR. Mean asymmetry index revealed a high accordance between PET/MR and PET/CT (1.5±2.2% vs. 0.9±3.6%; mean ratio (frontal/parieto-occipital) 0.93±0.08 vs. 0.96±0.05), respectively. CONCLUSIONS The hybrid BrainPET/MR allows for molecular, anatomical and functional imaging with uncompromised MR image quality and a high accordance of PET results between PET/MR and PET/CT. These results justify the application of this technique in further clinical studies and may contribute to the transfer into whole-body PET/MR systems.
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Affiliation(s)
- N F Schwenzer
- Department of Diagnostic and Interventional Radiology, Eberhard-Karls University Tübingen, Tübingen, Germany.
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Chuck NC, Jungraithmayr W, Puippe GD, Pazahr S, Nanz D, Boss A. MRI of the lung: comparison of ultrashort-echo-time (UTE) to zero-echo-time (ZTE). ROFO-FORTSCHR RONTG 2011. [DOI: 10.1055/s-0031-1295505] [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: 10/14/2022]
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Pazahr S, Fischer MA, Luechinger R, Schick F, Nanz D, Boss A. Assessment of segment specific flip angle distribution in Multi-Transmit 3.0T liver imaging: effects on contrast weighting in standard imaging. ROFO-FORTSCHR RONTG 2011. [DOI: 10.1055/s-0031-1295504] [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: 10/15/2022]
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Merten C, Ferrari P, Bakker M, Boss A, Hearty A, Leclercq C, Lindtner O, Tlustos C, Verger P, Volatier JL, Arcella D. Methodological characteristics of the national dietary surveys carried out in the European Union as included in the European Food Safety Authority (EFSA) Comprehensive European Food Consumption Database. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2011; 28:975-95. [PMID: 21732710 DOI: 10.1080/19440049.2011.576440] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
In 2009 competent organisations in the European Union provided the European Food Safety Authority (EFSA) with data from the most recent national dietary survey at the level of individuals' consumption. Twenty different Member States provided EFSA with data from 22 different national dietary surveys, with consumption figures for adults and, when available, for children. Member States' dietary data were assembled into the EFSA Comprehensive European Food Consumption Database. In this paper an overview of the methodologies and protocols employed in the different national dietary surveys is provided. Specifically, details about dietary assessment methods, interview administration, sampling design, portion size estimation, dietary software, evaluation of under-reporting and non-dietary information collected are described. This information is crucial to evaluate the level of accuracy of food consumption data and to anticipate and acknowledge the utmost important sources of heterogeneity of national databases included in the Comprehensive Database. The Comprehensive Database constitutes a unique resource for the estimation of consumption figures across the European Union and represents a useful tool to assess dietary exposure to hazardous substances and nutrient intake in Europe. Nevertheless, the many substantial methodological differences that characterise the Comprehensive Database are acknowledged and critically discussed.
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Schäfer JF, Teufel M, Koeppe S, Boss A, Szavay P, Obermayer F, Claussen CD. Dynamische Kontrastmittel verstärkte Magnetresonanz-Urographie zur funktionellen Nierendiagnostik bei Kindern mit einer Navigator-getriggerten TurboFLASH-Sequenz im Vergleich zur MAG3 Szintigraphie. ROFO-FORTSCHR RONTG 2011. [DOI: 10.1055/s-0031-1279333] [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: 10/18/2022]
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Schwenzer NF, Kolb A, Reimold M, Boss A, Stegger L, Bisdas S, Pichler B, Pfannenberg C, Claussen CD. Morphologische, funktionelle und metabolische Bildgebung an einem 3T BrainPET/MRT- ein Statusbericht. ROFO-FORTSCHR RONTG 2011. [DOI: 10.1055/s-0031-1279368] [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: 10/18/2022]
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Artunc F, Yildiz S, Rossi C, Boss A, Dittmann H, Schlemmer HP, Risler T, Heyne N. Simultaneous evaluation of renal morphology and function in live kidney donors using dynamic magnetic resonance imaging. Nephrol Dial Transplant 2010; 25:1986-1991. [DOI: 10.1093/ndt/gfp772] [Citation(s) in RCA: 11] [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] [Indexed: 08/30/2023] Open
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Bisdas S, Nägele T, Schlemmer HP, Boss A, Claussen CD, Pichler B, Ernemann U. Switching on the lights for real-time multimodality tumor neuroimaging: The integrated positron-emission tomography/MR imaging system. AJNR Am J Neuroradiol 2010; 31:610-4. [PMID: 19942710 DOI: 10.3174/ajnr.a1900] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [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: 11/07/2022]
Abstract
A recent report of the feasibility of simultaneous PET/MR imaging of the healthy human brain has sparked excitement in the field of neuroimaging because of its potential influence and utility in clinical neuroscience research. The aim of this communication is to discuss the benefits and current drawbacks of the hybrid imaging system and to highlight some perspectives of the new technique for brain neoplasms.
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Affiliation(s)
- S Bisdas
- Department of Diagnostic and Interventional Neuroradiology, Eberhard Karls University, Tübingen, Germany.
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Sauter AW, Boss A, Kolb A, Mantlik M, Bethge W, Kanz L, Pfannenberg C, Stegger L, Pichler B, Claussen C, Horger M. Erste Erfahrungen bei der Beurteilung hämato-onkologischer Krankheitsmanifestationen an den Extremitäten mit einem PET/MRT-Hybridsystem. ROFO-FORTSCHR RONTG 2010. [DOI: 10.1055/s-0030-1253047] [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: 10/19/2022]
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Schmidt D, Clasen S, Weihusen A, Rempp H, Schraml C, Boss A, Schick F, Claussen C, Pereira PL. Computerunterstützte Bildgebung zur Optimierung des Therapieerfolges der MR-gesteuerten Radiofrequenzablation von malignen Leberneoplasien. ROFO-FORTSCHR RONTG 2010. [DOI: 10.1055/s-0030-1252885] [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: 10/19/2022]
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Boss A, Bisdas S, Kolb A, Hofmann M, Nägele T, Ernemann U, Schlemmer HP, Claussen C, Reimold M, Pfannenberg C, Pichler B, Stegger L. Hybride PET/MRT-Bildgebung von intracraniellen Tumoren: Erste Erfahrungen und Vergleich zum PET/CT. ROFO-FORTSCHR RONTG 2010. [DOI: 10.1055/s-0030-1252583] [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: 10/19/2022]
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Boss A, Kolb A, Hofmann M, Bisdas S, Nägele T, Ernemann U, Stegger L, Schlemmer HP, Claussen C, Pfannenberg C, Reimold M, Pichler B, Klose U. Diffusion-Tensor-Bildgebung und Traktographie an einem humanen PET/MRT-Hybridsystem. ROFO-FORTSCHR RONTG 2010. [DOI: 10.1055/s-0030-1252713] [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: 10/19/2022]
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Rempp H, Clasen S, Schraml C, Schmidt D, Boss A, Roland J, Kickhefel A, Miller S, Schick F, Claussen C, Pereira PL. MR-Temperaturmapping bei der Radiofrequenzablation von hepatischen Tumoren: Wie genau kann das Koagulationsareal vorhergesagt werden? ROFO-FORTSCHR RONTG 2010. [DOI: 10.1055/s-0030-1253030] [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: 10/19/2022]
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Rossi C, Boss A, Artunc F, Yildiz S, Heyne N, Martirosian P, Claussen CD, Dittmann H, Schick F, Schlemmer HP. MR-tomographische Beurteilung von Nierenmorphologie, -Gefäßstatus sowie -Funktion bei potenziellen Nierenlebendspendern. ROFO-FORTSCHR RONTG 2009. [DOI: 10.1055/s-0029-1221535] [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: 10/20/2022]
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Schmidt D, Rempp HJ, Weihusen A, Clasen S, Boss A, Schraml C, Schick F, Claussen CD, Pereira PL. Evaluierung eines manuellen Segmentierungs- und Registrierungsalgorithmus für das Therapiemonitoring der MR gesteuerten Radiofrequenzablation maligner Leberneoplasien. ROFO-FORTSCHR RONTG 2009. [DOI: 10.1055/s-0029-1221762] [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: 10/20/2022]
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Clasen S, Rempp HJ, Boss A, Schmidt D, Schraml C, Fritz J, Claussen CD, Pereira PL. Multipolare hepatische Radiofrequenz-Ablation: Abschätzung des Koagulationsvolumens in Abhängigkeit von der applizierten Energie. ROFO-FORTSCHR RONTG 2009. [DOI: 10.1055/s-0029-1221734] [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: 10/20/2022]
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Boss A, Martirosian P, Fritz J, Kötter I, Henes JC, Claussen CD, Schick F, Horger M. Kontrastmittelfreie MR-Perfusionsbildgebung rheumatoider Arthritis der Handgelenke bei 3 Tesla. ROFO-FORTSCHR RONTG 2009. [DOI: 10.1055/s-0029-1221342] [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: 10/20/2022]
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Clasen S, Rempp HJ, Schmidt D, Schraml C, Boss A, Miller S, Claussen CD, Pereira PL. CT- und MRT-gestützte Radiofrequenz-Ablation in der Therapie des Hepatozellulären Karzinoms: Effektivitätsvergleich nach einmaliger und wiederholter Intervention. ROFO-FORTSCHR RONTG 2009. [DOI: 10.1055/s-0029-1221314] [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: 10/20/2022]
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Rossi C, Boss A, Lindig TM, Martirosian P, Steidle G, Claussen CD, Klose U, Schick F. Highly resolved Diffusion Tensor Imaging of the spinal cord at 3.0 Tesla. ROFO-FORTSCHR RONTG 2008. [DOI: 10.1055/s-2008-1052566] [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: 10/21/2022]
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Boss A, Oppitz M, Wehrl H, Rossi C, Claussen CD, Drews U, Pichler B, Schick F. Measurement of T1, T2 and Magnetization Transfer Properties during Embryonic Development Using the Chicken Model at 7 Tesla. ROFO-FORTSCHR RONTG 2008. [DOI: 10.1055/s-2008-1052589] [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: 10/21/2022]
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Horger M, Boss A, Vogel MN, Kötter I, Henes JC, Fritz J, Brodöfel H, Claussen CD. Rheumatoide Arthritis (RA): multimodale Diagnostik in der 3T-Ära. ROFO-FORTSCHR RONTG 2008. [DOI: 10.1055/s-2008-1074057] [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: 10/21/2022]
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Horger M, Boss A, Vogel M, Maksimovic O, Faul C, Vogel W, Bethge W, Claussen CD. Multimodale Diagnostik der chronischen GvHD des muskuloskelettalen Systems. ROFO-FORTSCHR RONTG 2008. [DOI: 10.1055/s-2008-1074058] [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: 10/21/2022]
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Boss A, Schäfer S, Martirosian P, Claussen CD, Schick F, Schäfer JF. T2*- und Linienbreitenbildgebung des Lungengewebes bei 0,2 Tesla. ROFO-FORTSCHR RONTG 2008. [DOI: 10.1055/s-2008-1073588] [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: 10/21/2022]
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Clasen S, Rempp HJ, Boss A, Fritz J, Schraml C, Schick F, Claussen CD, Pereira PL. MRT-gestützte perkutane Radiofrequenz-Ablation unter Verwendung eines 1,5 Tesla MR-Tomographen mit breiter Magnetöffnung: Erste klinische Ergebnisse in der Behandlung von 60 Lebermetastasen. ROFO-FORTSCHR RONTG 2008. [DOI: 10.1055/s-2008-1073702] [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: 10/21/2022]
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Schäfer JF, Boss A, Martirosian P, Schäfer S, Graepler-Mainka U, Stern M, Claussen CD, Schick F. Nichtinvasives Lungenperfusionsmapping mittels flusssensitiver MR-Bildgebung bei 1.5 Tesla: Vergleich von gesunden Probanden und Patienten mit Cystischer Fibrose. ROFO-FORTSCHR RONTG 2008. [DOI: 10.1055/s-2008-1073795] [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: 10/21/2022]
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Boss A, Schaefer JF, Martirosian P, Obermayr F, Fuchs J, Claussen CD, Schick F, Schlemmer HP. Dynamische Magnetresonanz-Nephrografie und -Urografie bei Kindern mit Harnwegserkrankungen. ROFO-FORTSCHR RONTG 2007; 179:832-40. [PMID: 17597444 DOI: 10.1055/s-2007-963198] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [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: 10/23/2022]
Abstract
PURPOSE To evaluate an improved method of dynamic magnetic resonance (MR) nephrography with short acquisition time and compensation of breathing motion for assessment of renal excretion and split renal function in children with anomalies of the urinary tract. MATERIALS AND METHODS A protocol for dynamic MR nephrography was implemented using a T1-weighted navigator-gated TurboFLASH sequence (TR/TE 498 ms/1.25 ms, saturation recovery time 300 ms, flip angle 8 degrees ). After bolus injection of 0.05 mmol/kg gadolinium dimeglumine (Gd-DTPA), split renal function was determined from the contrast-medium excretion. In 20 patients (ages between 3 months and 14 years), dynamic MR nephrography and MAG3 radionuclide scintigraphy as the gold standard were performed. RESULTS In all children, T1-weighted images were able to be recorded over 40 minutes at a nearly identical diaphragm position using the TurboFLASH sequence, thus allowing for exact region-of-interest analysis of the excretion and split renal function. The course of the contrast-medium concentration was able to be measured in the renal pelvis with good accuracy due to the high spatial resolution and the lack of breathing artifacts. Excellent correlation to the MAG3 scintigraphy was demonstrated for the excretion and split renal function (correlation coefficient: 0.975). CONCLUSION Dynamic MR nephrography allows for reliable assessment of renal function in children with anomalies of the urinary tract with higher spatial resolution as compared to radionuclide scintigraphy.
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Affiliation(s)
- A Boss
- Abteilung Radiologische Diagnostik, Radiologische Universitätsklinikum Tübingen, Hoppe-Seyler-Strasse 3, 72076 Tübingen
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Rossi C, Boss A, Lindig TM, Martirosian P, Steidle G, Maetzler W, Claussen CD, Klose U, Schick F. Diffusion Tensor Imaging of the Spinal Cord at 1.5 and 3.0 Tesla. ROFO-FORTSCHR RONTG 2007; 179:219-24. [PMID: 17325991 DOI: 10.1055/s-2007-962832] [Citation(s) in RCA: 32] [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: 10/23/2022]
Abstract
PURPOSE The feasibility of highly resolved diffusion tensor imaging (DTI) of the human cervical spinal cord was tested on a clinical MR unit operating at 3.0 Tesla. DTI parametrical maps and signal-to-noise ratios (SNRs) were compared to results recorded at 1.5 Tesla. MATERIALS AND METHODS Eight healthy volunteers and one patient participated in the study. A transverse oriented single-shot ECG-triggered echo-planar imaging (EPI) sequence with double spin-echo diffusion preparation was applied for highly resolved DTI of the spinal cord. The signal yield, fractional anisotropy (FA), and mean diffusivity (MD) were compared for both field strengths. The clinical applicability of the protocol was also tested in one patient with amyotrophic lateral sclerosis (ALS) at 3.0 T. RESULTS A mean increase in SNR of 95.7 +/- 4.6 % was found at 3.0 Tesla compared to 1.5 Tesla. Improved quality of the DTI parametrical maps was observed at higher field strength (p < 0.02). Comparable FA and MD (reported in units of 10 (-3) mm (2)/s) values were computed in the dorsal white matter at both field strengths (1.5 T: FA = 0.75 +/- 0.08, MD = 0.84 +/- 0.12, 3.0 T: FA = 0.74 +/- 0.04, MD = 0.93 +/- 0.14). The DTI images exhibited diagnostic image quality in the patient. At the site of the diseased corticospinal tract, a decrease of 46.0 +/- 3.8 % in FA (0.40 +/- 0.03) and an increase of 50.3 +/- 5.6 % in MD (1.40 +/- 0.05) were found in the ALS patient. CONCLUSION The 3.0 Tesla field strength provides higher image quality in DTI of the spinal cord compared to 1.5 T. The proposed DTI protocol seems adequate for the assessment of spinal cord diseases.
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Affiliation(s)
- C Rossi
- Sektion für Experimentelle Radiologie, Abteilung für Radiologische Diagnostik, Radiologische Universitätsklinik, Tübingen.
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Clasen S, Geng A, Herberts T, Boss A, Schmidt D, Schraml C, Fritz J, Kröber SM, Claussen CD, Pereira PL. Intern gekühlte bipolare Radiofrequenzablation: Ist eine niedrige Leistung effektiver? ROFO-FORTSCHR RONTG 2007; 179:282-8. [PMID: 17301932 DOI: 10.1055/s-2006-927360] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [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: 10/23/2022]
Abstract
PURPOSE Evaluation of bipolar radiofrequency (RF) ablation using internally cooled electrodes in an ex-vivo experiment. MATERIALS AND METHODS Bipolar RF ablations (n = 154) were performed in ex-vivo bovine liver. Both electrodes with a total length of the active tip of 4 cm were located on the same shaft of an internally cooled applicator. The power output was systematically varied between 20 and 100 watts (W). The energy application was continuous or modulated depending on the tissue resistance. In relationship to the maximum power output, the volume of coagulation was assessed. RESULTS In continuous energy application the induced volume of coagulation was increased at lower power outputs up to 33.7 cm (3) (20 watts). Parallel to an increased volume of coagulation, the required duration of energy application was increased up to a maximum of 51.6 minutes. Modulation of the power output as a function of the tissue resistance enabled application of a wide range of power outputs (40 - 75 watts) leading to a comparable extent of coagulation with a maximum of 14.9 cm (3) (10 min.), 16.8 cm (3) (15 min.), and 19.1 cm (3) (20 min.). CONCLUSION Continuous application of RF energy leads to an inverse relationship between volume of coagulation and power output. Modulation of the power output as a function of the tissue resistance enables application of a wider range of power outputs compared to continuous application of RF energy.
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Affiliation(s)
- S Clasen
- Diagnostische Radiologie, Radiologische Klinik, Universitätsklinikum Tübingen.
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Boss A, Martirosian P, Klose U, Nägele T, Claussen CD, Schick F. Spin-labeling imaging of cerebral perfusion at 1.5 and 3.0 Tesla. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-972133] [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: 10/21/2022]
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46
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Rempp H, Boss A, Martirosian P, Claussen CD, Schick F. Ganzkörper-Magnetisierungstransfer-MR-Bildgebung. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2006-956197] [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: 10/19/2022]
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47
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Rempp H, Boss A, Kraiger M, Pereira P, Claussen CD, Schick F. MR-Thermographie an Leber und Nieren mittels Phasenkontrast-Methode – Einflüsse von Atmung und Bewegung auf die Messgenauigkeit. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2006-956196] [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: 10/19/2022]
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48
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Boss A, Artunc F, Risler T, Claussen CD, Schick F, Schlemmer HP. Bestimmung der Glomerulären Filtrationsrate durch Messung der Gadobutrol-Clearance aus dem Extrazellularvolumen mittels Magnetresonanz-Tomographie. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-977197] [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: 10/21/2022]
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49
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Boss A, Obermayr F, Claussen CD, Schick F, Schlemmer HP, Schäfer JF. Dynamische Magnetresonanz-Nephrographie zur funktionellen Nierendiagnostik bei Kindern mit Uropathien. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-976910] [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: 10/21/2022]
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50
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Clasen S, Rempp H, Boss A, Schmidt D, Fritz J, Schraml C, Schick F, Claussen CD, Pereira PL. MRT-gestützte perkutane Radiofrequenz-Ablation in der Therapie des Hepatozellulären Karzinoms: Klinische Ergebnisse in der Behandlung von 24 Patienten. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-976940] [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: 10/21/2022]
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