Rohan Ramdoyal Email & Phone Number

Toronto, On, Ca

Development of MRI compatible Hemispherical FUS Array for Glioblastoma clinical trials:Objective : Design & build MRI compatible FUS array for safe BBB opening in human to deliver chemotherapy drugs. Performed Ray-Acoustic transcranial simulations in MATLAB to optimize focal qualities.Designed CAD of 30 cm diameter array in Python libraries, printed in SLA, assembled and waterproofed.Designed and built MRI compatible, fully plastic 4-axes positioner to move array around patient's head in MRI bore FUS array consists of 4096 cube transducers and 256 receivers used for passive acoustic mapping to control blood brain barrier opening.Device validated in pre-clinical experiments (pigs and rabbits). Clinical trials to start soon.Development of MRI compatible Hemispherical FUS Array for Histotripsy in stroke patients:Objective : Design MRI compatible FUS array for clot lysis in human brain using very high pressures.Performed Ray-Acoustic transcranial simulations in MATLAB to optimize focal qualities.CAD design of 30cm diameter array and transducer modules coded with python libraries.Novel automated assembly method to fabricate transducer modules using adhesive dispensing robot.FUS array of 4096 ring shaped transducers in 64 modules and 256 receivers.Currently fabricating modules.Development of MRI compatible Pre-clinical Hemispherical FUS Array for gene therapy delivery in NHP:Objective : Design & build MRI compatible FUS array for safe BBB opening in NHP to deliver gene therapy drugs. Performed Ray-Acoustic transcranial simulations in MATLAB to optimize focal qualities.Designed the CAD of 25.1 cm diameter array with python librariesDevice validated with BBB opening experiments in rabbits.Successful trials with NHP to deliver drugs in the brainAutomation of transducer fabrication:reduced fabrication time of clinical prototype devices from months to days using robots

North York

-From CT data, the design of a conformal helmet is automated in Python and using Python CAD libraries to output a print ready STL in a few clicks. All modules’ placement in 3d space is automated with custom scripts to detect collision, avoid collision and suppress side lobes.-Designed a 25.1 cm diameter dome with 64 modules (3840 transmit elements) and 256 receiver elements for blood brain barrier opening and beamforming of micro-bubbles during treatments. This dome has been used successfully on 24 rabbits and 4NHPs and may be used in human clinical trials.-Designed the modules, pin board and array frame of a hemispherical dome of 64 modules,4096 ring transducer elements for the treatment of stroke at 575 kHz. -Designed, innovated and supervised the manufacturing process behind making transducer elements capable of withstanding high voltage sonications for histotripsy in stroke patients at 250 kHz-Transcranial acoustic simulations were run using MATLAB scripts accelerated by CUDA to evaluate and optimize the pressure at the focus, side lobe dimensions, and treatment range and beamforming performance of receivers.-Using MATLAB scripts, RS 232 and GPIB protocols; the data acquisition was automated to query the transducer driver, function generator, digital multimeter, oscilloscope and 3d positioning arm.-Diligent analysis informed the best efficiency operating parameters which improved the efficiency by 17%, power output by 25% and module yield to 99% +.-Major improvements have been made in the waterproofing of modules, adhesion of film to transducer surface and characterization of new failure modes.-Automated analysis scripts were implemented to process large data with statistics, extract meaningful plots and export tables, charts, animated gifs to Excel or Powerpoint.

Toronto, Canada Area

 Used COMSOL Multiphysics software to carry out numerical simulations of different 3D Micromorph solar cell designs. Investigated how surface texturing at the interfaces of a Micromorph solar cell affects the photogeneration rate and short circuit current. Compared and optimised the solar cell parameters to attain current matching and maximise the net short circuit current generated in textured Micromorph cells using three different intermediate reflectors: ZnO, ITO and Selectively Transparent and Conducting Photonic Crystals (STCPC).

 Created a video explaining the fundamental physics of conventional photovoltaic solar cells, plasmonics and photonic crystals and how the latter two are applied in novel solar cell designs. Successfully summarized and communicated the information in a way that is comprehensible to novice students while being informative and relevant to active researchers. Learned how to create high quality 3D animations in the Autodesk Maya computer graphics software to convey the information in a final product that is both artistic and professional.

Mauritius

 Assisted the Senior Technician in building electric panels to start and operate pumps by wiring and connecting contactors, relays and other sensory devices. Designed and drew electric wiring plans for the electric panels in Microsoft Visio 2010 software. These plans were given to the clients along with their panels and pumps. Assisted in choosing the optimum pumps for clients based on pump characteristics curves, head and flow requirements and finally cost and size constraints. Assisted in installing and troubleshooting the pumps and sensory devices by monitoring voltages.  Assumed responsibility and fully commissioned a 2 variable speed pump cascade system using the Grundfos R100 remote control and Grundfos CU-351 pump control unit under the supervision of the senior technician at the building site of 7-star St.Regis Resort & Spa in Mauritius. Assumed responsibility and fully commissioned a Grundfos Hydro Multi-E Booster set of 2 pumps which was recently installed at the Bagatelle Hotel Project in Mauritius.

Toronto, Canada Area

 Designed and created a software using Visual C# programming language with user interface on Windows platform. I had to learn and master the Visual C# programming language through self-study  My software interacts with the Phidgets interface boards to control a complex hologram printing machine with stepper motors, switches, sensors and other actuators all working synchronously The software also performs image editing and processing whereby input images are manipulated as per the requirements of the desired hologram. The end product was an innovative, fully automated software, outperforming previous systems used to print holograms by being more efficient, able to do more tasks and limiting causes of errors. Moreover, my software is currently being used to print holograms at the Ontario College of Art & Design (OCAD).