Previous Research Projects

University of Southern California

From August 2012 to May 2014, my research focus was on image analysis aiming the development of automated tools for non-rigid intra-subject volume registration and segmentation from MR images, and phenotype classification based on abdominal fat. In this project, I worked with professors Krishna NayakHarry HuAnand Joshi, and Michael Goran. For more information about this topic, read the paper “Automatic intra-subject registration-based segmentation of abdominal fat from three-dimensional water–fat MRI“, from Dr. Joshi, Dr. Hu et al.

Segmentation tags for abdominal structures viewed using a function from the NIfTI toolbox.

Segmentation tags for abdominal structures viewed using a function from the NIfTI toolbox.

In addition, I also worked on the development of image formation algorithms using non-Cartesian parallel imaging applied to temporal-accelerated spiral Fourier velocity encoded (FVE) MRI as a follow up of my undergraduate thesis. This project was collaboration between professors Krishna Nayak, Joao Luiz Carvalho, and Taehoon Shin. These results were presented the 21st ISMRM Annual Meeting and Exhibition, in 2013.

Spiral FVE temporally-accelerated using UNFOLD, reconstructed with 3D image domain SPIRiT.

Spiral FVE temporally-accelerated using UNFOLD, reconstructed with 3D image domain SPIRiT.

Furthermore, I studied some image formation methods based on compressed sensing and constrained reconstruction techniques – especially using signal decomposition and component analysis – to be applied in non-Contrast Enhanced Magnetic Resonance Angiography. This project was a collaboration with other PhD students at USC and Dr. Mitsue Miyazaki’s team, from Toshiba Medical Research Institue USA.

University of Brasília

From June 2010 until August 2012 I worked under supervision of Professor João Luiz Carvalho on the development of algorithms to reconstruct Fourier velocity encoded MRI data using parallel imaging. In my senior project and scientific initiation research, I used 2D image domain SPIRiT to reconstruct images and flow diagrams. It was also investigated the use of different approaches in the image reconstruction of spiral FVE data such as: combining a reduced number of coils (near important vessels or reducing the effective FOV) and using an inversion of the Fourier transformations applied in the reconstruction process. My results were presented at the 20th ISMRM Annual Meeting and Exhibition34th EMBCXXIII Congresso Brasileiro de Engenharia Biomédica and also in my senior thesis. For detailed information, consult my publications.

Spatial images: oblique cut plane of the neck showing the carotids.

Spatial images: oblique cut plane of the neck showing the carotids.

Flow profiles from different undersampling factors and reconstruction algorithms.

Flow profiles from different undersampling factors and reconstruction algorithms.

From April 2009 until September 2010, I worked under supervision of Professor Ricardo de Queiroz, co-oriented by Professor Díbio Leandro Borges and Professor Camilo Chang Dorea , on the study of color constancy and calibration between color devices using a commercial camera as calibrative device. I also implemented an image scene classification (indoor vs outdoor) algorithm using machine learning. The results were presented at 7th DF’s Scientific Initiation Congress and at the Workshop de Pós-graduação do CIC (UnB).