Dr Adnan Trakic

Postdoctoral Research Fellow

School of Information Technology and Electrical Engineering
Faculty of Engineering, Architecture and Information Technology

Overview

Qualifications

  • PhD, The University of Queensland

Publications

View all Publications

Publications

Journal Article

Conference Publication

  • Trakic, Adnan, Wang, Yifan, Foster, Darren and Abbosh, Amin (2018). Microwave split-ring resonator array for imaging of near-surface material defects. In: 2018 Australian Microwave Symposium (AMS). Australian Microwave Symposium (AMS), Brisbane, Australia, (47-48). 6-7 February 2018. doi:10.1109/AUSMS.2018.8346975

  • Jin Jin, Liu, Feng, Trakic, Adnan, Weber, Ewald and Crozier, Stuart (2013). Application of Rotating RF Coil Array in B1 Shimming with Strict Local SAR Constraints. In: ISMRM (International Society for Magnetic Resonance in Medicine), Salt Lake City, USA, (). 20-26 April 2013.

  • Trakic, Adnan, Weber, Ewald, Jin, Jin, Li, Mingyan, Liu, Feng and Crozier, Stuart (2013). B1 gradient encoding with the rotating RF coil. In: Proceedings of the International Society for Magnetic Resonance in Medicine (ISMRM): 21st Scientific Meeting and Exhibition. International Society for Magnetic Resonance in Medicine (ISMRM): 21st Scientific Meeting and Exhibition, Salt Lake City, UT, United States, (). 20-16 April 2013.

  • Li, Mingyan, Jin Jin, Liu, Feng, Trakic, Adnan and Crozier, Stuart (2013). Efficient hybrid imaging reconstruction of sensitivity encoding parallel imaging performed on rotating radiofrequency coil array. In: Proceedings of the International Society for Magnetic Resonance in Medicine (ISMRM): 21st Scientific Meeting and Exhibition. International Society for Magnetic Resonance in Medicine, 21st Annual Meeting and Exhibition, Salt Lake City, UT, United States, (). 20-26 April 2013.

  • Li, Mingyan, Jin Jin, Liu, Feng, Weber, Ewald, Trakic, Adnan and Crozier, Stuart (2013). Highly accelerated parallel MRI using rotating radiofrequency coil array at 7T. In: ISMRM 21st Annual Meeting and Exhibition. International Society for Magnetic Resonance in Medicine, Salt Lake City, Utah USA, (). 20-26 April 2013.

  • Wang, Hua, Yu, Yeyang, Li, Joe, Trakic, Adnan, Hong, Mingjian, Liu, Feng and Crozier, Stuart (2012). A GA guided K-Space sampling for compressed sensing MRI. In: Proceedings of the International Society for Magnetic Resonance in Medicine, Melbourne, Australia, (). 5 - 11 May 2012.

  • McClymont, Darryl, Mehnert, Andrew J. H., Trakic, Adnan, Kennedy, Dominic and Crozier, Stuart (2012). Automated selection of hypointense regions in diffusion-weighted breast MRI. In: ISMRM 20th Annual Meeting & Exhibition: Adapting MRI in a Changing World. 20th Annual Meeting of the International Society for Magnetic Resonance in Medicine, Melbourme, VIC, Australia, (). 5-11 May 2012.

  • Li, Mingyan, Jin, Jin, Trakic, Adnan, Liu, Feng, Weber, Ewald, Li, Yu and Crozier, Stuart (2012). High acceleration with a rotating radiofrequency coil array (RRFCA) in parallel magnetic resonance imaging (MRI). In: 2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). 34th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS 2012, San Diego, United States, (1098-1101). 28 August - 1 September 2012. doi:10.1109/EMBC.2012.6346126

  • Li, Bing Keong, Weber, Ewald, Bartel, Fabian, Hunt, Dean, Engstrom, Craig, Trakic, Adnan, Demetriades,Tim and Crozier, Stuart (2012). Multi-directional MSK phased array wrist coil. In: 20th Annual Meeting of the International Society for Magnetic Resonance in Medicine (ISMRM), Melbourne, Australia, (). 5-11 May 2012.

  • Liu, Feng, Jin, Jin, Li, Mingyan, Trakic, Adnan, Weber, Ewald and Crozier, Stuart (2012). On the reduction of transmit B1 non-uniformity and SAR using a single-loop rotating RF coil. In: 34BEMS: 34th Annual Meeting of the Bioelectromagnetics Society, Brisbane, Australia, (). 17 - 22 June 2012.

  • Li, Bing Keong, Weber, Ewald, Bartel, Fabian, Morris, Dru, Engstrom, Craig, Trakic, Adnan, Wang, Hua, Kelly, Ben and Crozier, Stuart (2012). Open phased array knee coil for dynamic MSK MRI. In: 20th Annual Meeting of the International Society for Magnetic Resonance in Medicine (ISMRM), Melbourne, Australia, (). 5-11 May 2012.

  • McClymont, Darryl, Mehnert, Andrew, Trakic, Adnan, Kennedy, Dominic and Crozier, Stuart (2012). Segmentation of malignant lesions in breast MRI using distance-weighted three-variable co-occurrence. In: Computer Assisted Radiology and Surgery, Pisa, Italy, (). 27-30 June 2012.

  • McClymont, Darryl, Mehnert, Andrew, Trakic, Adnan, Kennedy, Dominic and Crozier, Stuart (2011). A Novel Method for Automatic Extraction of Apparent Diffusion Coefficients in Breast MRI. In: ISMRM, Montreal Canada, (). 09-14 May 2011.

  • Wang, Hua, Trakic, Adnan, Li, Bing Keong, Yu, Yeyang, Liu, Feng and Crozier, Stuart (2011). Compressed sensing on TDM-SENSE with rotating RF coil. In: International Society for Magnetic Resonance in Medicine, 17th scientific meeting and exhibition, Montreal, Quebec, Canada, (). May, 2011.

  • Li, Bing Keong, Wang, Hua, Weber, Ewald, Li, Yu, Trakic, Adnan, Lee, Daniel James, Farhat, Sedig, Glover, Paul, Bowtell, Richard and Crozier, Stuart (2010). A 7T ‘Capless’ Transceive Breast Coil. In: ISMRM-ESMRMB Joint Annual Meeting 2010. ISMRM-ESMRMB Joint Annual Meeting 2010: Clinical Needs and Technological Solutions, Stockholm, Sweden, (). 1-7 May 2010.

  • Wang, Hua, Li, Joe, Trakic, Adnan, Engstrom, Craig M., Li, Yu and Crozier, Stuart (2010). An orthogonality based RF decoupling method. In: Daniel K. Sodickson, Proceedings of the International Society for Magnetic Resonance in Medicine. Joint Annual Meeting ISMRM-ESMRMB 2010. ISMRM, Stockholm, Sweden, (3926-3926). 1-7 May, 2010.

  • Sanchez Lopez, Hector, Michael Poole, Trakic, Adnan and Crozier, Stuart (2010). Can we re-design the gradient coil to make the eddy current field match the primary gradient field?. In: ISMRM-ESMRMB Joint Annual Meeting 2010. ISMRM-ESMRMB Joint Annual Meeting 2010: Clinical Needs and Technological Solutions, Stockholm, Sweden, (). 1-7 May 2010.

  • Chi, J., Liu, F., Weber, Ewald, Li, Y., Wei, R., Xu,W., Trakic, A, Wang, H. and Crozier, S (2010). GPU Accelerated FDTD Solver and Its Application in B1-Shimming. In: Daniel K. Sodickson, M.D., Ph.D., Program Chair, ISMRM 18th Scientific Meeting and Exhibition. ISMRM-ESMRMB Joint Annual Meeting 2010, Stockholm, Sweden, (1477-1477). 1-7 May 2010.

  • McClymont, Darryl, Mehnert, Andrew, Trakic, Adnan, Crozier, Stuart and Kennedy, Dominic (2010). Improving the discrimination of benign and malignant breast MRI lesions using the apparent diffusion coefficient. In: Proceedings 2010 Digital Image Computing: Techniques and Applications DICTA 2010. Digital Image Computing: Techniques and Applications, DICTA 2010, Sydney , Australia, (569-574). 1-3 December 2010. doi:10.1109/DICTA.2010.101

  • Liu, Feng, Weber, Ewald, Trakic, Adnan, Wang, Hua and Crozier, Stuart (2010). On the reduction of the transmit B1 non-uniformity and SAR using a single-element rotating RF coil. In: ISMRM-ESMRMB Joint Annual Meeting 2010. ISMRM-ESMRMB Joint Annual Meeting 2010: Clinical Needs and Technological Solutions, Stockholm, Sweden, (). 1-7 May 2010.

  • Trakic, A., Wang, H., Weber, E., Li, B., Poole, M., Liu, F. and Crozier, S. (2010). Time Division Multiplexed - Sensitivity Encoding (TDM-SENSE) with a mechanically rotating RF coil. In: Daniel K. Sodickson, Proceedings of the International Society for Magnetic Resonance in Medicine. Joint Annual Meeting ISMRM-ESMRMB 2010. ISMRM, Stockholm, Sweden, (1507-1507). 1-7 May 2010.

  • Trakic, Adnan, Li, Bing Keong, Weber, Ewald, Liu, Feng, Wilson, Stephen and Crozier, Stuart (2009). A mechanically rotating RF transceive system and method for applications in magnetic resonance. In: 2009 Proceedings of the 17th ISMRM Scientific Meeting & Exhibition. 17th ISMRM Scientific Meeting & Exhibition, Honolulu, Hawaii, (505-505). 18-24 April 2009.

  • Poole, Michael, Sanchez Lopez, Hector, Trakic, Adnan and Crozier, Stuart (2009). Cool gradient coils designed with adaptive regularisation. In: 2009 Proceedings of the 17th ISMRM Scientific Meeting & Exhibition. 17th ISMRM Scientific Meeting & Exhibition, Honolulu, Hawaii, (774-774). 18-24 April 2009.

  • Trakic, Adnan, Weber, Ewald, Li, Bing Keong, Wang, Hua and Crozier, Stuart (2009). MRI with a rapidly rotating coil. In: 2009 Proceedings of the 17th ISMRM Scientific Meeting & Exhibition. 17th ISMRM Scientific Meeting & Exhibition, Honolulu, Hawaii, (2959-2959). 18-24 April 2009.

  • Wang, Hua, Liu, Feng, Li, Bing Keong, Trakic, Adnan and Crozier, Stuart (2009). Numerical evaluation of induced field by body motion around high field MRI magnets: A case study with an implanted pacemaker. In: 2009 Proceedings of the 17th ISMRM Scientific Meeting & Exhibition. 17th ISMRM Scientific Meeting & Exhibition, Honolulu, Hawaii, (3099-3099). 18-24 April 2009.

  • Akhand, M., Trakic, A., Terril, P., Liu, F., Wilson, S. and Crozier, S. (2009). Optimal tissue types in the thoracic electrical impedance model for thoracic electrical bioimpedance (TEB) studies. In: Proceedings of the 2009 Annual International Conference of the IEEE in Engineering in Medicine and Biology Society. 2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, Minneapolis, Minnesota, USA, (3913-3916). 3-6 September 2009. doi:10.1109/IEMBS.2009.5333554

  • Wang, H, Liu, F., Trakic, A. and Crozier, S. (2008). A BiCG Solution Based Quasi-Static Finite-Difference Scheme for Induced Field Evaluation in MRI. In: Proceeding of the International Society for Magnetic Resonance in Medicine, 16th Scientific Meeting & Exhibition. International Society for Magnetic Resonance in Medicine, Toronto, Ontario, Canada, (1192-1192). 3-9 May 2008.

  • Sanchez Lopez, H., Liu, F., Trakic, A., Weber, E. and Crozier, S. (2008). A new shimming approach using the Equivalent Magnetizing Current (EMC) Method. In: Proceedings of the 16th Annual Meeting of the International Society for Magnetic Resonance in Medicine. The International Society for Magnetic Resonance in Medicine, Toronto, Ontario, Canada, (2991-2991). 3-9 May 2008.

  • Liu, Feng, Wang, Hua, Trakic, Adnan and Crozier, Stuart (2008). EMF generated by the static magnetic field. In: international Society for Magnetic Resonance in Medicine Workshop on MR safety, Lisbon, Portugal, (). 13-14 July, 2008.

  • Trakic, A., Wang, H., Sanchez Lopez, H., Weber, E. and Crozier, S. (2008). Lowering the imager significantly reduces the field exposure of MRI occupational workers. In: Proceedings of the 16th Annual Meeting of the International Society for Magnetic Resonance in Medicine. The International Society for Magnetic Resonance in Medicine's 16th Scientific Meeting and Exhibition, Toronto, Ontario, Canada, (1050-1050). 3-9 May 2008.

  • Wang, H., Trakic, A., Liu, F. and Crozier, S. (2008). Numerical field evaluation of healthcare workers when bending towards high-field MRI magnets. In: F. W. Wehril, Magnetic Resonance in Medicine: Proceedings of the International Society for Magnetic Resonance in Medicine. ISMRM 16th Annual Scientific Meeting and Exhibition, Toronto, Ontario, Canada, (410-422). 3-9 May, 2008. doi:10.1002/mrm.21441

  • Wang, Hua, Liu, Feng, Trakic, Adnan and Crozier, Stuart (2008). Parallel computing methods for finite-difference schemes in MRI research. In: Progress In Electromagnetics Research Symposium (PIERS), Hangzhou, China, (). 24-28 March 2008.

  • Liu, F., Trakic, A., Sanchez Lopez, H., Weber, E. and Crozier, S. (2008). Tailoring of gradient coils for numerical exposure evaluations based on experimentally measured B-field. In: Proceedings of the 16th Annual Meeting of the International Society for Magnetic Resonance in Medicine. The International Society for Magnetic Resonance in Medicine's 16th Scientific Meeting and Exhibition, Toronto, Ontario, Canada, (1053-1053). 3-9 May 2008.

  • Sanchez Lopez, H., Liu, F., Trakic, A., Weber, E. and Crozier, S. (2008). The Equivalent Magnetizing Current (EMC) method for biplanar active and passive shim design. In: Proceedings of the 16th Annual Meeting of the International Society for Magnetic Resonance in Medicine. International Society for Magnetic Resonance in Medicine, Toronto, Ontario, Canada, (343-343). 3-9 May 2008.

  • Sanchez, H., Liu, F., Trakic, A., Weber, E. and Crozier, S. (2007). 3D-gradient coil structures for MRI designed using fuzzy membership functions. In: A. Dittmar and J. Clark, Proceedings of the 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC 2007), Lyon, France, (2042-2045). 23-26 August 2007. doi:10.1109/IEMBS.2007.4352721

  • Wang, H., Liu, F., Trakic, A., Xia, L. and Crozier, S. (2007). An improved quasi-static finite-difference scheme for induced field evaluation in MRI based on the biconjugate gradient method. In: A. Dittmar and J. Clark, Proceedings of the 29th Annual International Conference of the IEEE EMBS. 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC 2007), Lyon, France, (487-490). 23-26 August 2007. doi:10.1109/IEMBS.2007.4352329

  • Wang, Hua, Trakic, Adnan, Liu, Feng and Crozier, Stuart (2007). Modelling regulatory compliance of occupationally exposed MRI workers during gradient pulsing. In: 2007 Scientific Meeting Proceedings. Joint Annual Meeting ISMRM-ESMRMB, Berlin, Germany, (). 19-25 May, 2007.

  • Crozier, Stuart, Wang, Hua, Trakic, Adnan and Liu, Feng (2007). Modelling regulatory compliance of occupationally exposed MRI workers during gradient pulsing. In: Proceedings of the International Society for Magnetic Resonance in Medicine 15th scientific meeting and exhibition. International Society for Magnetic Resonance in Medicine 15th scientific meeting and exhibition, Berlin, Germany, (). 19- 25 May, 2007.

  • Crozier, S., Trakic, A., Wang. H. and Liu, F. (2007). Numerical study of currents in occupational workers induced by body-motion around high-ultrahigh field MRI magnets. In: Proceedings of the ISMRM 15th Scientific Meeting and Exhibition. International Society for Magnetic Resonance in Medicine, 15th Scientific Meeting and Exhibition, Berlin, Germany, (). 19-25 May 2007.

  • Crozier, Stuart, Trakic, Adnan, Wang, Hua and Liu, Feng (2007). Numerical study of currents in occupational workers induced by body-motion around high-ultrahigh field MRI magnets. In: Joint Annual Meeting ISMRM-ESMRMB, Berlin, Germany, (). 19-25 May, 2007.

  • Trakic, Adnan, Liu, Feng, Wang, Hua and Crozier, Stuart (2007). TFSF-FDTD Numerical Computational Method for Evaluation of Transient Eddy Currentsin MRI. In: Proceedings International Society for Magnetic Resonance in Medicine (ISMRM) Workshop on Advances in High Field MRI. ISMRM Workshop on Advances in High Field MRI, Asilomar Conference Center, Pacific Grove, California, (). 25-28 March, 2007.

  • Trakic, A., Liu, F., Sanchez Lopez, H., Wang, H and Crozier, S. (2007). Z-gradient coil optimisation in presence of time-varying eddy currents. In: Bongartz, G., Proceedings of the 15th Annual Meeting of International Society for Magnetic Resonance in Medicine. International Society for Magnetic Resonance in Medicine - ISMRM, Berlin, Germany, (3295-3295). 19-25 May, 2007.

  • Wang, Hua, Trakic, Adnan, Liu, Feng, Bialkowski, Marek E. and Crozier, Stuart (2006). A High Performance FDTD Scheme for MRI Applications. In: Proceedings of the International Society for Magnetic Resonance in Medicine: 14th Annual Meeting of International Society for Magentic Resonance in Medicine. ISMRM 14th Scientific Meeting & Exhibition, Washington, USA, (1385-1385). 6-12 May, 2006.

  • Sanchez Lopez, Hector, Liu, Feng, Trakic, Adnan and Crozier, Stuart (2006). A Simple Relationship for High Efficiency-Gradient Uniformity Trade-Offs in Multi-Layer Asymmetric Gradient Coils. In: D.G. Norris, Proceedings of the International Society for Magnetic Resonance in Medicine: 14th Annual Meeting of International Society for Magentic Resonance in Medicine. ISMRM 14th Scientific Meeting & Exhibition, Washington, USA, (705-705). 6-12 May, 2006.

  • Sanchez Lopez, H, Liu, F, Trakic, A. and Crozier, S (2006). A magnetization mapping approach for passive shim design in MRI. In: A. Dhawan, Proceedings of the 28th Annual IEEE Engineering in Medicine and Biology Society Annual International Conference. 28th Annual International Conference IEEE Engineering in Medicine and Biology Society, New York, USA, (1893-1896). 30 August - 3 September, 2006. doi:10.1109/IEMBS.2006.259480

  • Wang, H., Trakic, A., Xia,, Crozier, S, Liu, F and Bialkowski, M E (2006). A parallel FDTD scheme for electromagnetic analysis and design of MRI system. In: A. Hielscher, Proceedings of the 28th IEEE Engineering in Medicine and Biology Society Annual International Conference. 28th IEEE Engineering in Medicine and Biology Society Annual International Conference, New York, USA, (264-267). 30 August - 3 September, 2006. doi:10.1109/IEMBS.2006.259674

  • Trakic, Adnan, Wang, Hua, Liu, Feng, Sanchez Lopez, Hector and Crozier, Stuart (2006). Cylindrical 3D FDTD algorithm for the computation of low frequency transient eddy currents in MRI. In: D.G. Norris, Proceedings of the International Society for Magnetic Resonance in Medicine: 14th Annual Meeting of International Society for Magentic Resonance in Medicine. ISMRM 14th Scientific Meeting & Exhibition, Washington, USA, (1373-1373). 6-12 May, 2006.

  • Trakic, Adnan, Wang, Hua, Liu, Feng, Sanchez Lopez, Hector and Crozier, Stuart (2006). FDTD Analysis of transient eddy currents induced by gradient coil switching in MRI. In: D.G. Norris, Proceedings of the International Society for Magnetic Resonance in Medicine: 14th Annual Meeting of International Society for Magentic Resonance in Medicine. ISMRM 14th Scientific Meeting & Exhibition, Washington, USA, (1372-1372). 6-12 May, 2006.

  • Trakic, A., Liu, F., Sanchez Lopez, H., Wang, H. and Crozier, S. (2006). Tailoring magnetic field gradient design to magnet cryostat geometry. In: A. Dhawan, Proceedings of the 28th Annual International Conference on the IEEE Engineering in Medicine and Biology Society. 28th Annual International Conference on the IEEE Engineering in Medicine and Biology Society, New York, U.S.A., (268-271). 30 August - 3 September, 2006. doi:10.1109/IEMBS.2006.259223

  • Sanchez Lopez, Hector, Liu, Feng, Trakic, Adnan and Crozier, Stuart (2006). Torque-Figure of Merit Trade-off in Multi-Layer Asymmetric Gradient Coils. In: D.G. Norris, Proceedings of the International Society for Magnetic Resonance in Medicine: 14th Annual Meeting of International Society for Magentic Resonance in Medicine. ISMRM 14th Scientific Meeting & Exhibition, Washington, USA, (778-778). 6-12 May, 2006.

  • Liu, Nianjun, Trakic, Adnan, Liu, Feng, Appleton, Ben, Wilson, Stephen, Slaughter, Richard, Strugnell, Wendy and Crozier, Stuart (2005). A Novel Automated Left Ventricle Segmentation Routine. In: Martin O. Leach, Proceedings of the International Society for Magnetic Resonance in Medicine: International Society for Magnetic Resonance in Medicine, 13th Scientific Meeting and Exhibition. 13th International Society for Magnetic Resonance in Medicine (ISMRM-2005), Miami Beach, Florida, USA, (1636-1636). 7-13 May 2005.

  • Trakic, Adnan, Liu, Feng and Crozier, Stuart (2005). A Theoretical Comparative Study of the Induced Fields Generated by Symmetric and Asymmetric Whole-Body Transverse Gradient Coils. In: M.O Leach, Proceedings of the International Society for Magnetic Resonance in Medicine: International Society for Magnetic Resonance in Medicine, 13th Scientific Meeting and Exhibition. 13th International Society for Magnetic Resonance in Medicine (ISMRM-2005), Miami Beach, Florida, USA, (894-894). 7-13 May 2005.

  • Wei, Qing, Crozier, Stuart, Xu, Bin, Trakic, Adnan, Li, Bing Keong and Liu, Feng (2005). An object-orient designed FDTD simulator: Applications to high field systems. In: Martin O. Leach, Proceedings of the International Society for Magnetic Resonance in Medicine: International Society for Magnetic Resonance in Medicine, 13th Scientific Meeting and Exhibition. 13th International Society for Magnetic Resonance in Medicine (ISMRM-2005), Miami Beach, Florida, USA, (817-817). 7-13 May 2005.

  • Trakic, A., Liu, F. and Crozier, S. (2005). Comparative study of symmetric and asymmetric cylindrical MRI gradient Y-coils in terms of induced eddy currents. In: Y.T. Zhang, 27th Annual IEEE Engineering in Medicine and Biology Society. 27th Annual IEEE Engineering in Medicine and Biology Society, ShangHai, China, (445-448). 1-4 September 2005.

  • Liu, Nianjun, Crozier, Stuart, Wilson, Stephen, Liu, Feng, Appleton, Ben, Trakic, Adnan, Wei, Qing, Strugnell, Wendy, Slaughter, Richard and Riley, Robyn (2005). Right ventricle extraction by low level and model-based algorithm. In: Y.T. Zhang, Proceedings of the 2005 IEEE Engineering in Medicine and Biology 27th Annual Conference. 27th Annual IEEE Engineering in Medicine and Biology Society, Shanghai, China, (677-680). 1-4 September 2005. doi:10.1109/IEMBS.2005.1616745

  • Liu, Feng, Crozier, Stuart, Trakic, Adnan, Xu, Bin, Li, Bing Keong and Wei, Qing (2005). Using the STIR Optimization Method to Determine the Optimal Rung Drives for Resonators in High Field Head MRI. In: Martin O. Leach, Proceedings of the International Society for Magnetic Resonance in Medicine: International Society for Magnetic Resonance in Medicine, 13th Scientific Meeting and Exhibition. 13th International Society for Magnetic Resonance in Medicine (ISMRM-2005), Miami Beach, Florida, USA, (2750-2750). 7-13 May 2005.

Other Outputs

PhD and MPhil Supervision

Completed Supervision