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McBride A, Obuchowski N, Partovi S, Gadani S. Abstract No. 216 ▪ FEATURED ABSTRACT Liver vein deprivation (LVD) vs portal vein embolization (PVE): retrospective review of safety and efficacy. J Vasc Interv Radiol 2022. [DOI: 10.1016/j.jvir.2022.03.297] [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] Open
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Tuifua T, Partovi S, Shah S, Bullen J, Enders J, Kapoor B, Gadani S. Abstract No. 222 Pre-TIPS body composition measurements as predictors for long-term mortality after TIPS placement. J Vasc Interv Radiol 2022. [DOI: 10.1016/j.jvir.2022.03.303] [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] Open
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Borovik A, Gadani S, Bullen J, Haddadin I, Levitin A, Partovi S. Abstract No. 516 Risk of postcontrast acute kidney injury in patients with gastrointestinal (GI) bleeding undergoing computed tomography angiography (CTA) followed by visceral angiography within 24 hours. J Vasc Interv Radiol 2022. [DOI: 10.1016/j.jvir.2022.03.498] [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] Open
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Li X, Partovi S. Save the Brain First: CTA and Mechanical Thrombectomy in Patients at Risk for Contrast-Induced Nephropathy. AJNR Am J Neuroradiol 2020; 41:637-638. [PMID: 32217552 DOI: 10.3174/ajnr.a6515] [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] [Received: 03/09/2020] [Accepted: 03/10/2020] [Indexed: 11/07/2022]
Affiliation(s)
- X Li
- Section of Interventional Radiology, Imaging InstituteCleveland Clinic FoundationCleveland, Ohio
| | - S Partovi
- Section of Interventional Radiology, Imaging InstituteCleveland Clinic FoundationCleveland, Ohio
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Melzig C, Wörz S, Egenlauf B, Partovi S, Rohr K, Grünig E, Kauczor H, Heussel C, Rengier F. Automatisierte 3D-Volumetrie von CT-Angiografien zur nicht-invasiven Bestimmung des pulmonalarteriellen Drucks bei Patienten mit Verdacht auf pulmonale Hypertonie. ROFO-FORTSCHR RONTG 2017. [DOI: 10.1055/s-0037-1600450] [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: 10/19/2022]
Affiliation(s)
- C Melzig
- Universitätsklinikum Heidelberg, Diagnostische und Interventionelle Radiologie, Heidelberg
| | - S Wörz
- BioQuant, Universität Heidelberg, Bioinformatics & Functional Genomics, Heidelberg
| | - B Egenlauf
- Thoraxklinik, Universitätsklinikum Heidelberg, Pneumologie, Heidelberg
| | - S Partovi
- University Hospitals Case Medical Center, Case Western Reserve University, Radiologie, Cleveland, Ohio, USA
| | - K Rohr
- BioQuant, Universität Heidelberg, Bioinformatics & Functional Genomics, Heidelberg
| | - E Grünig
- Thoraxklinik, Universitätsklinikum Heidelberg, Pneumologie, Heidelberg
| | - H Kauczor
- Universitätsklinikum Heidelberg, Diagnostische und Interventionelle Radiologie, Heidelberg
| | - C Heussel
- Thoraxklinik, Universitätsklinikum Heidelberg, Radiologie, Heidelberg
| | - F Rengier
- Universitätsklinikum Heidelberg, Diagnostische und Interventionelle Radiologie, Heidelberg
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Buethe J, Farrell J, Partovi S, Bochnakova T, Robbin M, McDaniel J, Kang P, Kapoor B, Tavri S, Patel I. Medical student (MS) interventional radiology (IR) symposium: raising awareness and interest in pursuing IR residency. J Vasc Interv Radiol 2017. [DOI: 10.1016/j.jvir.2016.12.1058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Engelke J, Popov A, Simon A, Partovi S, Karck M, Rengier F, Weymann A, Raake P, Doesch A, Lotz J, Karmonik C, Ruhparwar A. Competing Flow Between Partial Circulatory Support and Native Cardiac Output: A Computational Fluid Dynamics-Study. J Heart Lung Transplant 2016. [DOI: 10.1016/j.healun.2016.01.225] [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: 11/17/2022] Open
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Partovi S, Vidal L, Nakamoto D, Lu Z, Buethe J, Coffey M, Patel I. Lymphatic malformation treatment in adult and pediatric populations using real-time MRI guided percutaneous sclerotherapy. J Vasc Interv Radiol 2016. [DOI: 10.1016/j.jvir.2015.12.570] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Engelke J, Popov AF, Partovi S, Karck M, Simon A, Rengier F, Weymann A, Raake P, Doesch A, Lotz J, Karmonik C, Ruhparwar A. Competing Flow between Partial Circulatory Support and Native Cardiac Output: a computational Fluid Dynamics-Study. Thorac Cardiovasc Surg 2016. [DOI: 10.1055/s-0036-1571669] [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: 10/22/2022]
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Karmonik C, Anderson JR, Beilner J, Ge JJ, Partovi S, Klucznik RP, Diaz O, Zhang YJ, Britz GW, Grossman RG, Lv N, Huang Q. Relationships and redundancies of selected hemodynamic and structural parameters for characterizing virtual treatment of cerebral aneurysms with flow diverter devices. J Biomech 2015; 49:2112-2117. [PMID: 26654675 DOI: 10.1016/j.jbiomech.2015.11.035] [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: 11/12/2015] [Accepted: 11/13/2015] [Indexed: 11/28/2022]
Abstract
BACKGROUND AND PURPOSE To quantify the relationship and to demonstrate redundancies between hemodynamic and structural parameters before and after virtual treatment with a flow diverter device (FDD) in cerebral aneurysms. METHODS Steady computational fluid dynamics (CFD) simulations were performed for 10 cerebral aneurysms where FDD treatment with the SILK device was simulated by virtually reducing the porosity at the aneurysm ostium. Velocity and pressure values proximal and distal to and at the aneurysm ostium as well as inside the aneurysm were quantified. In addition, dome-to-neck ratios and size ratios were determined. Multiple correlation analysis (MCA) and hierarchical cluster analysis (HCA) were conducted to demonstrate dependencies between both structural and hemodynamic parameters. RESULTS Velocities in the aneurysm were reduced by 0.14m/s on average and correlated significantly (p<0.05) with velocity values in the parent artery (average correlation coefficient: 0.70). Pressure changes in the aneurysm correlated significantly with pressure values in the parent artery and aneurysm (average correlation coefficient: 0.87). MCA found statistically significant correlations between velocity values and between pressure values, respectively. HCA sorted velocity parameters, pressure parameters and structural parameters into different hierarchical clusters. HCA of aneurysms based on the parameter values yielded similar results by either including all (n=22) or only non-redundant parameters (n=2, 3 and 4). CONCLUSION Hemodynamic and structural parameters before and after virtual FDD treatment show strong inter-correlations. Redundancy of parameters was demonstrated with hierarchical cluster analysis.
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Affiliation(s)
- C Karmonik
- MRI Core, Houston Methodist Research Institute, Houston, TX, USA; Cerebrovascular Center, Neurosurgery, Houston Methodist, Houston, TX, USA.
| | - J R Anderson
- MRI Core, Houston Methodist Research Institute, Houston, TX, USA
| | | | - J J Ge
- Siemens AX, Shanghai, China
| | - S Partovi
- Department of Radiology, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, OH, USA
| | - R P Klucznik
- Cerebrovascular Center, Radiology, Houston Methodist, Houston, TX, USA
| | - O Diaz
- Cerebrovascular Center, Radiology, Houston Methodist, Houston, TX, USA
| | - Y J Zhang
- Cerebrovascular Center, Neurosurgery, Houston Methodist, Houston, TX, USA
| | - G W Britz
- Cerebrovascular Center, Neurosurgery, Houston Methodist, Houston, TX, USA
| | - R G Grossman
- Cerebrovascular Center, Neurosurgery, Houston Methodist, Houston, TX, USA
| | - N Lv
- Neurosurgery, The Affiliated Changhai Hospital of Second Military Medical University, Shanghai, China
| | - Q Huang
- Neurosurgery, The Affiliated Changhai Hospital of Second Military Medical University, Shanghai, China
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Grosse U, Syha R, Gatidis S, Grözinger G, Martirosian P, Partovi S, Nikolaou K, Robbin MR, Schick F, Springer F. MR-basedin vivofollow-up study of Achilles tendon volume and hydration state after ankle-loading activity. Scand J Med Sci Sports 2015; 26:1200-8. [DOI: 10.1111/sms.12550] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/10/2015] [Indexed: 12/01/2022]
Affiliation(s)
- U. Grosse
- Department of Diagnostic and Interventional Radiology; University Hospital Tübingen; Tübingen Germany
- Department of Radiology; University Hospital Case Medical Center; Case Western Reserve University; Cleveland Ohio USA
| | - R. Syha
- Department of Diagnostic and Interventional Radiology; University Hospital Tübingen; Tübingen Germany
| | - S. Gatidis
- Department of Diagnostic and Interventional Radiology; University Hospital Tübingen; Tübingen Germany
| | - G. Grözinger
- Department of Diagnostic and Interventional Radiology; University Hospital Tübingen; Tübingen Germany
| | - P. Martirosian
- Section on Experimental Radiology; Department of Diagnostic and Interventional Radiology; University Hospital Tübingen; Tübingen Germany
| | - S. Partovi
- Department of Radiology; University Hospital Case Medical Center; Case Western Reserve University; Cleveland Ohio USA
| | - K. Nikolaou
- Department of Diagnostic and Interventional Radiology; University Hospital Tübingen; Tübingen Germany
| | - M. R. Robbin
- Department of Radiology; University Hospital Case Medical Center; Case Western Reserve University; Cleveland Ohio USA
| | - F. Schick
- Section on Experimental Radiology; Department of Diagnostic and Interventional Radiology; University Hospital Tübingen; Tübingen Germany
| | - F. Springer
- Department of Diagnostic and Interventional Radiology; University Hospital Tübingen; Tübingen Germany
- Musculoskeletal Centre X-Ray Department; Chapel Allerton Hospital; Leeds UK
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Grosse U, Syha R, Partovi S, Keßler DE, Bongers M, Seith F, Nikolaou K, Robbin M, Schick F, Springer F. Intradiurnal Fluctuations of Off-Resonance Saturation Effects in Healthy Human Achilles Tendons Assessed with a 3D Ultrashort Echo Time MRI Sequence at 3 Tesla. ROFO-FORTSCHR RONTG 2015; 187:1003-10. [PMID: 26090729 DOI: 10.1055/s-0035-1553187] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
PURPOSE The purpose of this study was to evaluate whether gravitational interstitial fluid accumulation in healthy subjects has an impact on off-resonance saturation ratios (OSR) or the volume of the Achilles tendon after a prolonged time of reduced levels of physical activity. MATERIALS AND METHODS 7 healthy volunteers were repeatedly investigated on 3 consecutive days on a 3 T whole body MR scanner using an ultrashort echo time (UTE) imaging sequence with a Gaussian off-resonance saturation pulse at a frequency offset of 2000 Hz to calculate OSR values. For accurate volumetric quantification of the Achilles tendon, a newly developed contour detection snake algorithm was applied on high-resolution isotropic T2-weighted SPACE sequence datasets. Single-measure intraclass correlation coefficients (ICC) were calculated to estimate test-retest reliability. RESULTS For OSR and tendon volume measurements on three consecutive days, excellent reproducibility could be achieved with ICC values above 0.96 and 0.97, respectively. Comparing the results of all three days, a statistically significant mean individual percentage decrease (- 4.1 ± 1.5 %; p = 0.001) of calculated tendon OSR values was found for the evening measurements. No statistically significant difference between tendon volumes in the morning and the evening could be detected (p = 0.589). CONCLUSION The results of this in-vivo study demonstrate a significant influence of gravitational interstitial fluid accumulation after reduced physical activity on OSR values in the Achilles tendon, but not on tendon volume. Taken together with the demonstrated excellent reproducibility, these findings are important for future studies investigating temporal changes of the Achilles tendon microstructure.
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Affiliation(s)
- U Grosse
- Department of Diagnostic and Interventional Radiology, University Hospital Tuebingen, Germany
| | - R Syha
- Department of Diagnostic and Interventional Radiology, University Hospital Tuebingen, Germany
| | - S Partovi
- Department of Radiology, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, Germany
| | - D E Keßler
- Department of Diagnostic and Interventional Radiology, University Hospital Tuebingen, Germany
| | - M Bongers
- Department of Diagnostic and Interventional Radiology, University Hospital Tuebingen, Germany
| | - F Seith
- Department of Diagnostic and Interventional Radiology, University Hospital Tuebingen, Germany
| | - K Nikolaou
- Department of Diagnostic and Interventional Radiology, University Hospital Tuebingen, Germany
| | - M Robbin
- Department of Radiology, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, Germany
| | - F Schick
- Section on Experimental Radiology, Department of Diagnostic and Interventional Radiology, University Hospital Tuebingen, Germany
| | - F Springer
- Department of Diagnostic and Interventional Radiology, University Hospital Tuebingen, Germany
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Partovi S, Karimi S, Lyo JK, Esmaeili A, Tan J, Deangelis LM. Multimodality imaging of primary CNS lymphoma in immunocompetent patients. Br J Radiol 2014; 87:20130684. [PMID: 24646184 DOI: 10.1259/bjr.20130684] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Primary central nervous system lymphoma (PCNSL) belongs to the group of extranodal non-Hodgkin's lymphoma, and the management of the disease is radically different from other central nervous system neoplasms. Owing to its varied appearance on imaging, diagnosis of PCNSL can be challenging. The purpose of this pictorial review is to depict the brain findings of PCNSL during initial diagnosis in immunocompetent individuals. Multimodal imaging integrating advanced sequences can facilitate differentiation of PCNSL from other CNS neoplasms.
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Demirel S, Chen D, Mei Y, Partovi S, von Tengg-Kobligk H, Dadrich M, Böckler D, Kauczor HU, Müller-Eschner M. Comparison of morphological and rheological conditions between conventional and eversion carotid endarterectomy using computational fluid dynamics – a pilot study. Vascular 2014; 23:474-82. [DOI: 10.1177/1708538114552836] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Purpose: To compare postoperative morphological and rheological conditions after eversion carotid endarterectomy versus conventional carotid endarterectomy using computational fluid dynamics. Basic methods: Hemodynamic metrics (velocity, wall shear stress, time-averaged wall shear stress and temporal gradient wall shear stress) in the carotid arteries were simulated in one patient after conventional carotid endarterectomy and one patient after eversion carotid endarterectomy by computational fluid dynamics analysis based on patient specific data. Principal findings: Systolic peak of the eversion carotid endarterectomy model showed a gradually decreased pressure along the stream path, the conventional carotid endarterectomy model revealed high pressure (about 180 Pa) at the carotid bulb. Regions of low wall shear stress in the conventional carotid endarterectomy model were much larger than that in the eversion carotid endarterectomy model and with lower time-averaged wall shear stress values (conventional carotid endarterectomy: 0.03–5.46 Pa vs. eversion carotid endarterectomy: 0.12–5.22 Pa). Conclusions: Computational fluid dynamics after conventional carotid endarterectomy and eversion carotid endarterectomy disclosed differences in hemodynamic patterns. Larger studies are necessary to assess whether these differences are consistent and might explain different rates of restenosis in both techniques.
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Affiliation(s)
- S Demirel
- Department of Vascular and Endovascular Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - D Chen
- Department of Biomedical Engineering, School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Y Mei
- Department of Biomedical Engineering, School of Life Science, Beijing Institute of Technology, Beijing, China
| | - S Partovi
- Department of Radiology, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, USA
| | - H von Tengg-Kobligk
- Institute of Diagnostic, Interventional and Pediatric Radiology, University Hospital Bern, Inselspital, Bern, Switzerland
- Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Heidelberg, Germany
| | - M Dadrich
- Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Heidelberg, Germany
- Department of Radiology, German Cancer Research Center (dkfz), Heidelberg, Germany
| | - D Böckler
- Department of Vascular and Endovascular Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - HU Kauczor
- Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Heidelberg, Germany
| | - M Müller-Eschner
- Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Heidelberg, Germany
- Department of Radiology, German Cancer Research Center (dkfz), Heidelberg, Germany
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Partovi S, Kohan A, Vercher-Conejero JL, Rubbert C, Margevicius S, Schluchter MD, Gaeta C, Faulhaber P, Robbin MR. Qualitative and quantitative performance of ¹⁸F-FDG-PET/MRI versus ¹⁸F-FDG-PET/CT in patients with head and neck cancer. AJNR Am J Neuroradiol 2014; 35:1970-5. [PMID: 24924545 DOI: 10.3174/ajnr.a3993] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [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: 12/12/2022]
Abstract
BACKGROUND AND PURPOSE MR imaging and PET/CT are integrated in the work-up of head and neck cancer patients. The hybrid imaging technology (18)F-FDG-PET/MR imaging combining morphological and functional information might be attractive in this patient population. The aim of the study was to compare whole-body (18)F-FDG-PET/MR imaging and (18)F-FDG-PET/CT in patients with head and neck cancer, both qualitatively in terms of lymph node and distant metastases detection and quantitatively in terms of standardized uptake values measured in (18)F-FDG-avid lesions. MATERIALS AND METHODS Fourteen patients with head and neck cancer underwent both whole-body PET/CT and PET/MR imaging after a single injection of (18)F-FDG. Two groups of readers counted the number of lesions on PET/CT and PET/MR imaging scans. A consensus reading was performed in those cases in which the groups disagreed. Quantitative standardized uptake value measurements were performed by placing spheric ROIs over the lesions in 3 different planes. Weighted and unweighted κ statistics, correlation analysis, and the Wilcoxon signed rank test were used for statistical analysis. RESULTS κ statistics for the number of head and neck lesion lesions counted (pooled across regions) revealed interreader agreement between groups 1 and 2 of 0.47 and 0.56, respectively. Intrareader agreement was 0.67 and 0.63. The consensus reading provided an intrareader agreement of 0.63. For the presence or absence of metastasis, interreader agreement was 0.85 and 0.70. The consensus reading provided an intrareader agreement of 0.72. The correlations between the maximum standardized uptake value in (18)F-FDG-PET/MR imaging and (18)F-FDG-PET/CT for primary tumors and lymph node and metastatic lesions were very high (Spearman r = 1.00, 0.93, and 0.92, respectively). CONCLUSIONS In patients with head and neck cancer, (18)F-FDG-PET/MR imaging and (18)F-FDG-PET/CT provide comparable results in the detection of lymph node and distant metastases. Standardized uptake values derived from (18)F-FDG-PET/MR imaging can be used reliably in this patient population.
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Affiliation(s)
- S Partovi
- From the Department of Radiology (S.P., A.K., J.L.V.-C., C.R., C.G., P.F., M.R.R.), University Hospitals Seidman Cancer Center, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, Ohio
| | - A Kohan
- From the Department of Radiology (S.P., A.K., J.L.V.-C., C.R., C.G., P.F., M.R.R.), University Hospitals Seidman Cancer Center, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, Ohio
| | - J L Vercher-Conejero
- From the Department of Radiology (S.P., A.K., J.L.V.-C., C.R., C.G., P.F., M.R.R.), University Hospitals Seidman Cancer Center, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, Ohio
| | - C Rubbert
- From the Department of Radiology (S.P., A.K., J.L.V.-C., C.R., C.G., P.F., M.R.R.), University Hospitals Seidman Cancer Center, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, Ohio
| | - S Margevicius
- Department of Biostatistics and Epidemiology (S.M., M.D.S.), Case Western Reserve University, Cleveland, Ohio
| | - M D Schluchter
- Department of Biostatistics and Epidemiology (S.M., M.D.S.), Case Western Reserve University, Cleveland, Ohio
| | - C Gaeta
- From the Department of Radiology (S.P., A.K., J.L.V.-C., C.R., C.G., P.F., M.R.R.), University Hospitals Seidman Cancer Center, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, Ohio
| | - P Faulhaber
- From the Department of Radiology (S.P., A.K., J.L.V.-C., C.R., C.G., P.F., M.R.R.), University Hospitals Seidman Cancer Center, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, Ohio
| | - M R Robbin
- From the Department of Radiology (S.P., A.K., J.L.V.-C., C.R., C.G., P.F., M.R.R.), University Hospitals Seidman Cancer Center, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, Ohio
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Kohan AA, Kolthammer JA, Vercher-Conejero JL, Rubbert C, Partovi S, Jones R, Herrmann KA, Faulhaber P. N staging of lung cancer patients with PET/MRI using a three-segment model attenuation correction algorithm: Initial experience. Eur Radiol 2013; 23:3161-9. [DOI: 10.1007/s00330-013-2914-y] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2013] [Revised: 04/14/2013] [Accepted: 04/24/2013] [Indexed: 12/26/2022]
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Partovi S, Thomas S, Traughber B, Ellis R, Faulhaber P. Preliminary Evaluation of Dedicated PET/MRI in Gastrointestinal Malignancy: Qualitative and Quantitative Comparison to PET/CT. Pract Radiat Oncol 2013; 3:S27. [DOI: 10.1016/j.prro.2013.01.093] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [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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Partovi S, Imfeld S, Aschwanden M, Bilecen D, Jaeger KA, Staub D. The Use of Contrast-enhanced Ultrasound (CEUS) in Chronic Periaortitis. Ultraschall Med 2013; 34:2-3. [PMID: 22872380 DOI: 10.1055/s-0032-1313081] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
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Ruhparwar A, Karmonik C, Partovi S, Piontek P, Schmack B, Kallenbach K, Arif R, Ghodsizad A, Karck M. Assessing blood flow and wall shear stress of the ascending aorta and aortic root using computational fluid dynamics in patients with non-pulsatile and pulsatile left ventricular assist devices. Thorac Cardiovasc Surg 2013. [DOI: 10.1055/s-0032-1332290] [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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Müller-Eschner M, Rengier F, Partovi S, Weber TF, Kopp-Schneider A, Geisbüsch P, Kauczor HU, von Tengg-Kobligk H. Accuracy and variability of semiautomatic centerline analysis versus manual aortic measurement techniques for TEVAR. Eur J Vasc Endovasc Surg 2013; 45:241-7. [PMID: 23318135 DOI: 10.1016/j.ejvs.2012.12.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Accepted: 12/06/2012] [Indexed: 10/27/2022]
Abstract
OBJECTIVES This study aims to test whether inter-observer variability and time of diameter measurements for thoracic endovascular aortic repair (TEVAR) are improved by semiautomatic centerline analysis compared to manual assessment. METHODS Preoperative computed tomography (CT) angiographies of 30 patients with thoracic aortic disease (mean age 66.8 ± 11.6 years, 23 males) were retrospectively analysed by two blinded experts in vascular radiology. Maximum aortic diameters at three positions relevant to TEVAR were assessed (P1, distal to left common carotid artery; P2, distal to left subclavian artery; and P3, proximal to coeliac trunk) using three measurement techniques: manual axial slices (axial), manual double-oblique multiplanar reformations (MPRs) and semiautomatic centerline analysis. RESULTS Diameter measurements by both centerline analysis and the axial technique did not significantly differ from MPR (p = 0.17 and p = 0.37). Total deviation index for 0.9 was for P1 2.7 mm (axial), 3.7 mm (MPR), 1.8 mm (centerline); for P2 2.0 mm (axial), 3.6 mm (MPR), 1.8 mm (centerline); and for P3 3.0 mm (axial), 3.5 mm (MPR), 2.5 mm (centerline). Measurement time using centerline analysis was significantly shorter than for assessment by MPR. CONCLUSIONS Centerline analysis provides the least variable and fast diameter measurements in TEVAR patients with the same accuracy as the current reference standard MPR.
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Affiliation(s)
- M Müller-Eschner
- Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Im Neuenheimer Feld 110, 69120 Heidelberg, Germany
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Partovi S, Bruckner B, Staub D, Ortiz G, Scheinin S, Seethamraju H, Loebe M. Bloodless Lung Transplantation in Jehovah's Witnesses: Impact on Perioperative Parameters and Outcome Compared With a Matched Control Group. Transplant Proc 2013; 45:335-41. [DOI: 10.1016/j.transproceed.2012.06.057] [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] [Received: 06/10/2012] [Accepted: 06/26/2012] [Indexed: 10/27/2022]
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Jacobi B, Schulte AC, Partovi S, Michel S, Karimi S, Lyo JK, Daikeler T, Aschwanden M, Staub D, Zipp L, Rasmus M, Huegli RW, Bongartz G, Bilecen D. Alterations of skeletal muscle microcirculation detected by blood oxygenation level-dependent MRI in a patient with granulomatosis with polyangiitis. Rheumatology (Oxford) 2012; 52:579-81. [DOI: 10.1093/rheumatology/kes176] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [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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Partovi S, Jacobi B, Rapps N, Zipp L, Karimi S, Rengier F, Lyo JK, Stippich C. Clinical standardized fMRI reveals altered language lateralization in patients with brain tumor. AJNR Am J Neuroradiol 2012; 33:2151-7. [PMID: 22595902 DOI: 10.3174/ajnr.a3137] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Brain tumors affecting language-relevant areas may influence language lateralization. The purpose of this study was to systematically investigate language lateralization in brain tumor patients using clinical language fMRI, comparing the results with a group of healthy volunteers. MATERIALS AND METHODS Fifty-seven strictly right-handed patients with left-hemispheric-space intracranial masses (mainly neoplastic) affecting either the Broca area (n = 19) or Wernicke area (n = 38) were prospectively enrolled in this study. Fourteen healthy volunteers served as a control group. Standardized clinical language fMRI, using visually triggered sentence- and word-generation paradigms, was performed on a 1.5T MR scanner. Semiautomated analyses of all functional data were conducted on an individual basis using BrainVoyager. A regional lateralization index was calculated for Broca and Wernicke areas separately versus their corresponding right-hemisphere homologs. RESULTS In masses affecting the Broca area, a significant decrease in the lateralization index was found when performing word generation (P = .0017), whereas when applying sentence generation, the decrease did not reach statistical significance (P = .851). Masses affecting the Wernicke area induced a significant decrease of the lateralization index when performing sentence generation (P = .0007), whereas when applying word generation, the decrease was not statistically significant (P = .310). CONCLUSIONS Clinical language fMRI was feasible for patients with brain tumors and provided relevant presurgical information by localizing essential language areas and determining language dominance. A significant effect of the brain masses on language lateralization was observed, with a shift toward the contralesional, nondominant hemisphere. This may reflect compensatory mechanisms of the brain to maintain communicative abilities.
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Affiliation(s)
- S Partovi
- Department of Neuroradiology, University Hospital of Basel, Basel, Switzerland.
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Müller-Eschner M, Rengier F, Partovi S, Weber TF, Kopp-Schneider A, Geisbüsch P, Böckler D, Kauczor HU, Tengg-Kobligk HV. Interobserver-Variabilität der semiautomatischen Centerline-Analyse verglichen mit manuellen Messtechniken zur Erfassung von Aortendurchmessern vor thorakaler endovaskulärer Therapie. ROFO-FORTSCHR RONTG 2012. [DOI: 10.1055/s-0032-1311015] [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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Rengier F, Weber T, Partovi S, Müller-Eschner M, Böckler D, Kauczor HU, von Tengg-Kobligk H. Reliability of Semiautomatic Centerline Analysis versus Manual Aortic Measurement Techniques for TEVAR among Non-experts. J Vasc Surg 2011. [DOI: 10.1016/j.jvs.2011.07.042] [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: 10/17/2022]
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Wallace RC, Karis JP, Partovi S, Fiorella D. Noninvasive imaging of treated cerebral aneurysms, part I: MR angiographic follow-up of coiled aneurysms. AJNR Am J Neuroradiol 2007; 28:1001-8. [PMID: 17569946 PMCID: PMC8134173 DOI: 10.3174/ajnr.a0662] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.5] [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: 11/07/2022]
Abstract
MRA is emerging as an alternative to conventional catheter based angiography for the assessment of aneurysms after endovascular treatment. Short TE and contrast enhanced MRA techniques can be applied to optimize image quality. We review the available data regarding the application of MR for the assessment of cerebral aneurysms after endovascular therapy.
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Affiliation(s)
- R C Wallace
- Division of Neuroradiology, Barrow Neurological Institute, St Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
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Wallace RC, Karis JP, Partovi S, Fiorella D. Noninvasive imaging of treated cerebral aneurysms, Part II: CT angiographic follow-up of surgically clipped aneurysms. AJNR Am J Neuroradiol 2007; 28:1207-12. [PMID: 17698518 PMCID: PMC7977656 DOI: 10.3174/ajnr.a0664] [Citation(s) in RCA: 30] [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: 11/07/2022]
Abstract
Although not useful for the evaluation of coiled aneurysms, CT angiography (CTA) is far superior to MR angiography (MRA) for the evaluation of aneurysms after surgical clipping. Using the latest multidetector row scanners and optimized imaging parameters, CTA can often effectively depict and follow small aneurysm remnants; demonstrate patency, stenosis, or vasospasm in the adjacent parent vessels; and provide surveillance of the entire cerebrovasculature for de novo aneurysms after surgical clipping. Despite these advances, conventional angiography remains the gold standard for the evaluation of surgically treated aneurysms and should be liberally used to resolve any cases of diagnostic uncertainty on noninvasive imaging.
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Affiliation(s)
- R C Wallace
- Division of Neuroradiology, Barrow Neurological Institute, St Joseph's Hospital and Medical Center, Phoenix, AZ, USA
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Abstract
The use of tissue plasminogen activator (tPA) in community hospitals has been limited by a lack of neurologic support. The authors developed a telephone network to support community emergency departments (EDs) in the use of tPA. Their experience demonstrates equivalent results for patients treated by telephone and those treated in-house. Their number of tPA-treated patients increased 72%. Requirements included willingness of community EDs to use tPA and willingness of the stroke center to provide support.
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Affiliation(s)
- J L Frey
- Department of Neurology, Barrow Neurological Institute, Phoenix, AZ, USA
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Abstract
OBJECT This study was undertaken to evaluate the long-term angiographic outcome of surgically treated aneurysms, which is unknown. Specifically, the incidence of recurrent aneurysms, the fate of residual necks, and the de novo formation of aneurysms were evaluated. METHODS One hundred two patients (80 females and 22 males; mean age 49 years; range 12-78 years) harboring a total of 167 aneurysms underwent late follow-up angiography; 160 aneurysms were surgically treated. Late angiographic follow-up review was obtained at a mean of 4.4 +/- 1.6 years postsurgery (range 2.6-9.7 years). Late follow-up angiography revealed two recurrent aneurysms (1.5%) of 135 clipped aneurysms without residua. Of 12 aneurysms with known residua, there were eight "dog-ear" residua, of which two (25%) enlarged. One hemorrhage was noted, yielding a hemorrhage risk of 1.9% per year. A second subgroup with broad-based residua revealed dramatic regrowth in three of four cases. Eight de novo aneurysms were found in six patients, for an annual risk of 1.8% per year. A history of multiple aneurysms was associated with de novo aneurysm formation (p = 0.049, chi-square analysis). CONCLUSIONS This study confirms the long-term efficacy of aneurysm clip ligation. In addition, the authors found there is a small but significant risk of de novo aneurysm formation, particularly in patients with multiple aneurysms. Most residual aneurysm rests appear to remain stable, although a subset may enlarge or rupture. These findings support the rationale for late angiographic follow-up review in patients with aneurysms.
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Affiliation(s)
- C A David
- Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona 85013-4496, USA
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Partovi S, Fram EK, Karis JP. Fast spin echo MR imaging. Neuroimaging Clin N Am 1999; 9:553-76. [PMID: 10433645] [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: 02/13/2023]
Abstract
For years, investigators have sought after faster MR scanning techniques. Gradient echo and echo planar imaging were potential candidates that met with limited success. Fast spin echo (FSE) imaging was an innovation that revolutionized the clinical utility of MR imaging and fulfilled the promise of fast diagnostic MR scanning. FSE allows for the acquisition of MR images that often equals and occasionally exceeds the quality of conventional spin echo imaging, all during less or similar scanning time.
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Affiliation(s)
- S Partovi
- Department of Radiology, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona 85013, USA.
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Abstract
Radiology Internet Protocol (RIP) is an image transmission protocol designed to address the special needs of radiology World Wide Web (Web) servers. RIP preserves the ability to alter the window and level (W/L) settings of an image over the Internet from a remote location while maintaining short transmission times. RIP operates with a client-server paradigm and can be used for Web-based radiology teaching files or Internet-based teleradiology. The protocol itself is based on the concept of W/L partitioning, whereby the clinically most important W/L setting of an image is transmitted first. Supplementary data are appended to the initial transmitted image in the background while the user is reviewing the preliminary image. The time required to transmit the first image, or time-to-first-image, is comparable with that of graphics interchange format and Joint Photographic Expert Group (JPEG) files. The longer the user looks at an image, the more data are appended to it in the background. Ultimately, the user can view a received image at any W/L setting.
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Affiliation(s)
- S Partovi
- Department of Diagnostic Radiology, University of British Columbia, Vancouver Hospital and Health Science Center, Canada
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Partovi S, Logan PM, Janzen DL, O'Connell JX, Connell DG. Low-grade parosteal osteosaracoma of the ulna with dedifferentiation into high-grade osteosarcoma. Skeletal Radiol 1996; 25:497-500. [PMID: 8837286 DOI: 10.1007/s002560050123] [Citation(s) in RCA: 13] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
This report describes a low-grade parosteal osteosarcoma of the ulna with dedifferentiation into high-grade osteosarcoma. The clinical, pathological, and imaging findings are described and discussed.
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Affiliation(s)
- S Partovi
- Department of Radiology, University of British Columbia, Vancouver, Canada
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