The Experts below are selected from a list of 273 Experts worldwide ranked by ideXlab platform
Osmo Tervonen - One of the best experts on this subject based on the ideXlab platform.
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MR-guided breast biopsy and hook wire marking using a low-field (0.23 T) scanner with Optical Instrument tracking
European Radiology, 2007Co-Authors: Roberto Blanco Sequeiros, Andreas M.blanco Sequeiros, Teuvo Vaara, Risto Ojala, Heli Reinikainen, Eija Pääkkö, Osmo TervonenAbstract:The purpose of this study was to evaluate the technical feasibility of MR-guided percutaneous breast biopsy (LCNB) and breast hook wire marking in a low-field (0.23 T) MRI system with Optical Instrument tracking. MR-guided core biopsy and/or hook wire marking was performed on 13 lesions observable at MR imaging only. Seven breast LCNBs and 10 hook wire markings were performed under MR guidance on 11 patients. The diagnosis was confirmed by excision biopsy or mastectomy in 12 lesions and with histopathological and cytological diagnosis and 12-month clinical follow-up in one lesion. All lesions seen in the high-field scanner were also successfully identified and targeted in the low-field scanner. The following procedures were typically technically successful. There were difficulties due to unsatisfactory functioning of some core biopsy guns. Detailed description of low-field MR guidance and Optical tracking in breast biopsies is provided. The procedure seems accurate and safe and provides means to obtain a histological diagnosis of a breast lesion only seen with MRI. The low-field biopsy system is comparable to the high-field MRI system. MR-compatible biopsy guns need to be improved.
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MR imaging-guided laser ablation of osteoid osteomas with use of Optical Instrument guidance at 0.23 T
European Radiology, 2003Co-Authors: Roberto Blanco Sequeiros, Andreas M.blanco Sequeiros, Teuvo Vaara, Risto Ojala, Rauli Klemola, Lasse Jyrkinen, Pekka Hyvönen, Osmo TervonenAbstract:The purpose of this study was to determine the feasibility and features of low-field MR imaging in performing interstitial laser ablation of osteoid osteomas. Between September 2001 and April 2002, five consecutive patients with clinical and imaging findings suggesting osteoid osteoma and referred for removal of osteoid osteoma were treated with interstitial laser treatment. A low-field open-configuration MRI scanner (0.23 T, Outlook Proview, Philips Medical Systems, Finland) with Optical Instrument guidance hardware and software was used. Laser device used was of ND-Yag type (Fibertom medilas, Dornier Medizin Technik, Germany). A bare laser fiber (Dornier Medizin Technik, Germany) with a diameter of 400 μm was used. Completely balanced steady-state (CBASS; true fast imaging with steady precession) imaging was used for lesion localization, Instrument guidance, and thermal monitoring. A 14-G (Cook Medical, USA) bone biopsy drill was used for initial approach. Laser treatment was conducted through the biopsy canal. All the lesions were successfully localized, targeted, and treated under MRI guidance. All the patients were symptom free 3 weeks and 3 months after the treatment. There was one recurrence reported during follow-up (6 months). The MRI-guided percutaneous interstitial laser ablation of osteoid osteomas seems to be a feasible treatment mode.
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mri guided trephine biopsy and fine needle aspiration in the diagnosis of bone lesions in low field 0 23 t mri system using Optical Instrument tracking
European Radiology, 2002Co-Authors: Roberto Blanco Sequeiros, Risto Ojala, Rauli Klemola, Lasse Jyrkinen, Elisa Lappiblanco, Ylermi Soini, Osmo TervonenAbstract:The purpose of this study was to evaluate the feasibility of MRI-guided bone biopsy with Optical Instrument tracking and evaluate advantage of combined fine-needle aspiration (FNA) with trephine biopsy. Twenty trephine bone biopsies and 13 FNAs were performed under MRI and CT guidance in 14 patients. Informed consent was obtained from all patients. The evaluation of diagnostic accuracy was achieved by comparing the histopathological and cytological diagnosis with current or final diagnosis made during 6-month clinical follow-up. A 0.23-T open MRI scanner with interventional tools (Outlook Proview, Marconi Medical Systems, Cleveland, Ohio) was used. A surface coil was used. For trephine biopsy MRI-compatible bone biopsy set (Daum medical, Schwerin, Germany) was used. The FNA was performed with MRI compatible 20-G needle (Cook, Bloomington, Ind.). The diagnostic accuracy of MRI-guided trephine biopsy was 95%. The FNA sample diagnosis concurred with the histological in 54%. Our results show that MRI guidance in bone biopsies is accurate and safe. It is comparable to CT-guided or open biopsy. The role of combined FNA with bone biopsies remains controversial.
Lyn D English - One of the best experts on this subject based on the ideXlab platform.
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engineering design in the primary school applying stem concepts to build an Optical Instrument
Faculty of Education, 2017Co-Authors: Donna King, Lyn D EnglishAbstract:Internationally there is a need for research that focuses on STEM (Science, Technology, Engineering and Mathematics) education to equip students with the skills needed for a rapidly changing future. One way to do this is through designing engineering activities that reflect real-world problems and contextualise students’ learning of STEM concepts. As such, this study examined the learning that occurred when fifth-grade students completed an Optical engineering activity using an iterative engineering design model. Through a qualitative methodology using a case study design, we analysed multiple data sources including students’ design sketches from eight focus groups. Three key findings emerged: first, the collaborative process of the first design sketch enabled students to apply core STEM concepts to model construction; second, during the construction stage students used experimentation for the positioning of lenses, mirrors and tubes resulting in a simpler ‘working’ model; and third, the redesign process enabled students to apply structural changes to their design. The engineering design model was useful for structuring stages of design, construction and redesign; however, we suggest a more flexible approach for advanced applications of STEM concepts in the future.
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engineering design in the primary school applying stem concepts to build an Optical Instrument
International Journal of Science Education, 2016Co-Authors: Donna King, Lyn D EnglishAbstract:Internationally there is a need for research that focuses on STEM (Science, Technology, Engineering and Mathematics) education to equip students with the skills needed for a rapidly changing future...
Roberto Blanco Sequeiros - One of the best experts on this subject based on the ideXlab platform.
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MR-guided breast biopsy and hook wire marking using a low-field (0.23 T) scanner with Optical Instrument tracking
European Radiology, 2007Co-Authors: Roberto Blanco Sequeiros, Andreas M.blanco Sequeiros, Teuvo Vaara, Risto Ojala, Heli Reinikainen, Eija Pääkkö, Osmo TervonenAbstract:The purpose of this study was to evaluate the technical feasibility of MR-guided percutaneous breast biopsy (LCNB) and breast hook wire marking in a low-field (0.23 T) MRI system with Optical Instrument tracking. MR-guided core biopsy and/or hook wire marking was performed on 13 lesions observable at MR imaging only. Seven breast LCNBs and 10 hook wire markings were performed under MR guidance on 11 patients. The diagnosis was confirmed by excision biopsy or mastectomy in 12 lesions and with histopathological and cytological diagnosis and 12-month clinical follow-up in one lesion. All lesions seen in the high-field scanner were also successfully identified and targeted in the low-field scanner. The following procedures were typically technically successful. There were difficulties due to unsatisfactory functioning of some core biopsy guns. Detailed description of low-field MR guidance and Optical tracking in breast biopsies is provided. The procedure seems accurate and safe and provides means to obtain a histological diagnosis of a breast lesion only seen with MRI. The low-field biopsy system is comparable to the high-field MRI system. MR-compatible biopsy guns need to be improved.
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MR imaging-guided laser ablation of osteoid osteomas with use of Optical Instrument guidance at 0.23 T
European Radiology, 2003Co-Authors: Roberto Blanco Sequeiros, Andreas M.blanco Sequeiros, Teuvo Vaara, Risto Ojala, Rauli Klemola, Lasse Jyrkinen, Pekka Hyvönen, Osmo TervonenAbstract:The purpose of this study was to determine the feasibility and features of low-field MR imaging in performing interstitial laser ablation of osteoid osteomas. Between September 2001 and April 2002, five consecutive patients with clinical and imaging findings suggesting osteoid osteoma and referred for removal of osteoid osteoma were treated with interstitial laser treatment. A low-field open-configuration MRI scanner (0.23 T, Outlook Proview, Philips Medical Systems, Finland) with Optical Instrument guidance hardware and software was used. Laser device used was of ND-Yag type (Fibertom medilas, Dornier Medizin Technik, Germany). A bare laser fiber (Dornier Medizin Technik, Germany) with a diameter of 400 μm was used. Completely balanced steady-state (CBASS; true fast imaging with steady precession) imaging was used for lesion localization, Instrument guidance, and thermal monitoring. A 14-G (Cook Medical, USA) bone biopsy drill was used for initial approach. Laser treatment was conducted through the biopsy canal. All the lesions were successfully localized, targeted, and treated under MRI guidance. All the patients were symptom free 3 weeks and 3 months after the treatment. There was one recurrence reported during follow-up (6 months). The MRI-guided percutaneous interstitial laser ablation of osteoid osteomas seems to be a feasible treatment mode.
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mri guided trephine biopsy and fine needle aspiration in the diagnosis of bone lesions in low field 0 23 t mri system using Optical Instrument tracking
European Radiology, 2002Co-Authors: Roberto Blanco Sequeiros, Risto Ojala, Rauli Klemola, Lasse Jyrkinen, Elisa Lappiblanco, Ylermi Soini, Osmo TervonenAbstract:The purpose of this study was to evaluate the feasibility of MRI-guided bone biopsy with Optical Instrument tracking and evaluate advantage of combined fine-needle aspiration (FNA) with trephine biopsy. Twenty trephine bone biopsies and 13 FNAs were performed under MRI and CT guidance in 14 patients. Informed consent was obtained from all patients. The evaluation of diagnostic accuracy was achieved by comparing the histopathological and cytological diagnosis with current or final diagnosis made during 6-month clinical follow-up. A 0.23-T open MRI scanner with interventional tools (Outlook Proview, Marconi Medical Systems, Cleveland, Ohio) was used. A surface coil was used. For trephine biopsy MRI-compatible bone biopsy set (Daum medical, Schwerin, Germany) was used. The FNA was performed with MRI compatible 20-G needle (Cook, Bloomington, Ind.). The diagnostic accuracy of MRI-guided trephine biopsy was 95%. The FNA sample diagnosis concurred with the histological in 54%. Our results show that MRI guidance in bone biopsies is accurate and safe. It is comparable to CT-guided or open biopsy. The role of combined FNA with bone biopsies remains controversial.
Donna King - One of the best experts on this subject based on the ideXlab platform.
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engineering design in the primary school applying stem concepts to build an Optical Instrument
Faculty of Education, 2017Co-Authors: Donna King, Lyn D EnglishAbstract:Internationally there is a need for research that focuses on STEM (Science, Technology, Engineering and Mathematics) education to equip students with the skills needed for a rapidly changing future. One way to do this is through designing engineering activities that reflect real-world problems and contextualise students’ learning of STEM concepts. As such, this study examined the learning that occurred when fifth-grade students completed an Optical engineering activity using an iterative engineering design model. Through a qualitative methodology using a case study design, we analysed multiple data sources including students’ design sketches from eight focus groups. Three key findings emerged: first, the collaborative process of the first design sketch enabled students to apply core STEM concepts to model construction; second, during the construction stage students used experimentation for the positioning of lenses, mirrors and tubes resulting in a simpler ‘working’ model; and third, the redesign process enabled students to apply structural changes to their design. The engineering design model was useful for structuring stages of design, construction and redesign; however, we suggest a more flexible approach for advanced applications of STEM concepts in the future.
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engineering design in the primary school applying stem concepts to build an Optical Instrument
International Journal of Science Education, 2016Co-Authors: Donna King, Lyn D EnglishAbstract:Internationally there is a need for research that focuses on STEM (Science, Technology, Engineering and Mathematics) education to equip students with the skills needed for a rapidly changing future...
Jugal Agarwal - One of the best experts on this subject based on the ideXlab platform.
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a novel Optical Instrument for estimating size segregated aerosol mass concentration in real time
Aerosol Science and Technology, 2009Co-Authors: Xiaoliang Wang, George John Chancellor, James Evenstad, James E Farnsworth, Anthony Hase, Gregory Olson, Avula Sreenath, Jugal AgarwalAbstract:A novel Optical Instrument has been developed that estimates size segregated aerosol mass concentration (i.e., PM 10 , PM 4 , PM 2.5 , and PM 1 ) over a wide concentration range (0.001–150 mg/m 3 ) in real time. This Instrument combines photometric measurement of the particle cloud and Optical sizing of single particles in a single Optical system. The photometric signal is calibrated to approximate the PM 2.5 fraction of the particulate mass, the size range over which the photometric signal is most sensitive. The electrical pulse heights generated by light scattering from particles larger than 1 micron are calibrated to approximate the aerodynamic diameter of an aerosol of given physical properties, from which the aerosol mass distribution can be inferred. By combining the photometric and Optical pulse measurements, this Instrument can estimate aerosol mass concentrations higher than typical single particle counting Instruments while providing size information and more accurate mass concentration informat...