Cookies Policy
We use cookies to improve our site and your experience. By continuing to browse our site you accept our cookie policy. Find out More
Close
  • Menu
About

About

My academic path started with a graduation in Physics Engineering (IST/Lisbon), followed by an MSc in Electrotechnical Eng. and Computers (IST/Lisbon), and a PhD in Physics /FCUP/UPorto). Along the way, I participated in different projects that had, as a common feature,  the development of new solutions or approaches in  Applied Optics  (LIDAR measuring systems, biosensors, fiber optic sensing, high resolution optical imaging, optical coherence tomography). As a lecturer at UPorto, I have been mostly envolved in the Physics Eng. and Medical Physics MSc programs. At the Center of Applied Photonics (INESC TEC) I have found the place/team to  develop my research in applied optics, looking for solutions for academic challenges, but most importantly for the challenges we receive from industrial partners, seeking for new measuring approaches using light as a probing agent. 

Interest
Topics
Details

Details

004
Publications

2016

Effects of shielding on pelvic and abdominal IORT dose distributions

Authors
Esposito, A; Sakellaris, T; Limede, P; Costa, F; Cunha, LT; Dias, AG; Lencart, J; Sarmento, S; Rosa, CC;

Publication
PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS

Abstract
Purpose: To study the impact of shielding elements in the proximity of Intra-Operative Radiation Therapy (IORT) irradiation fields, and to generate graphical and quantitative information to assist radiation oncologists in the design of optimal shielding during pelvic and abdominal IORT. Method: An IORT system was modeled with BEAMnrc and EGS++ Monte Carlo codes. The model was validated in reference conditions by gamma index analysis against an experimental data set of different beam energies, applicator diameters, and bevel angles. The reliability of the IORT model was further tested considering shielding layers inserted in the radiation beam. Further simulations were performed introducing a bone-like layer embedded in the water phantom. The dose distributions were calculated as 3D dose maps. Results: The analysis of the resulting 2D dose maps parallel to the clinical axis shows that the bevel angle of the applicator and its position relative to the shielding have a major influence on the dose distribution. When insufficient shielding is used, a hotspot nearby the shield appears near the surface. At greater depths, lateral scatter limits the dose reduction attainable with shielding, although the presence of bone-like structures in the phantom reduces the impact of this effect. Conclusions: Dose distributions in shielded IORT procedures are affected by distinct contributions when considering the regions near the shielding and deeper in tissue: insufficient shielding may lead to residual dose and hotspots, and the scattering effects may enlarge the beam in depth. These effects must be carefully considered when planning an IORT treatment with shielding.

2014

Real-time dosimeter targeted to nuclear applications

Authors
Correia, A; Rosa, CC; Santos, PMP; Falcao, AN; Lorentz, K;

Publication
SECOND INTERNATIONAL CONFERENCE ON APPLICATIONS OF OPTICS AND PHOTONICS

Abstract
An intrinsic fiber optic dosimeter (FOD) targeted to nuclear applications is presented. The proposed real-time dosimeter provides dose information based on the historic record over time of the effects of ionizing radiation on single-and multi-mode pure silica fibers, and also on PMMA plastic fibers. The effect of Co-60 gamma irradiation on optical links based on silica and plastic fibers were assessed, considering thermal environment effects over a wide range of variation of the operating parameters. Cerenkov radiation and radiation-induced absorption effects were in focus. The corresponding distortion and spectral transmission degradation were evaluated over wide range of the operating parameters. Radiation induced attenuation (RIA) has shown a spectral band dependent behaviour up to 840 Gy dose levels. The performance of different fibers was assessed against the performance of non-irradiated fibers. From the measurements of dose rate and total dose imparted by ionizing radiation in the fibers we verified that fibers with radiation resistance issues showed wavelength-dependent radiation sensitivity increasing with dose rate. Upon evaluation of correlations between the total dose, the induced loss at various dose rates and different wavelengths, it was concluded that intrinsic fiber dosimeters can be used for dose rates in the range 4 - 28 Gy/min., typical of severe radiation environments.

2013

Characterization of PET preforms using spectral domain optical coherence tomography

Authors
Hosseiny, H; Ferreira, MJ; Martins, T; Carmelo Rosa, CC;

Publication
8TH IBEROAMERICAN OPTICS MEETING AND 11TH LATIN AMERICAN MEETING ON OPTICS, LASERS, AND APPLICATIONS

Abstract
Polyethylene terephthalate (PET) preforms are massively produced nowadays with the purpose of producing food and beverages packaging and liquid containers. Some varieties of these preforms are produced as multilayer structures, where very thin inner film(s) act as a barrier for nutrients leakage. The knowledge of the thickness of this thin inner layer is important in the production line. The quality control of preforms production requires a fast approach and normally the thickness control is performed by destructive means out of the production line. A spectral domain optical coherence tomography (SD-OCT) method was proposed to examine the thin layers in real time. This paper describes a non-destructive approach and all required signal processing steps to characterize the thin inner layers and also to improve the imaging speed and the signal to noise ratio. The algorithm was developed by using graphics processing unit (GPU) with computer unified device architecture (CUDA). This GPU-accelerated white light interferometry technique non-destructively assesses the samples and has high imaging speed advantage, overcoming the bottlenecks in PET performs quality control.

2008

Statistics of the depth-scan photocurrent in time-domain optical coherence tomography

Authors
Sherif S. Sherif; Carla Carmelo Rosa; Costel Flueraru; Shoude Chang; Youxin Mao; Adrian G. Podoleanu

Publication
JOSA A - Journal of the Optical Society of America A , vol.25, no.1, pp.16-20

Abstract

2008

En-Face differential absorption optical coherence tomography with gold nanorods as the contrast agent

Authors
Michael Leitner; Andreas Henkel; Carsten Sönnichsen; Carla Carmelo Rosa; Adrian G. Podoleanu

Publication
1st Canterbury OCT&AO - 1st Canterbury Workshop on Optical Coherence Tomography and Adaptive Optics, Canterbury, United Kingdom

Abstract

2007

Multiscan time-domain optical coherence tomography for retina imaging

Authors
Carla Carmelo Rosa; John Rogers; Justin Pedro; Richard rosen; Adrian Podoleanu

Publication
APPL OPTICS - APPLIED OPTICS , vol.46, no.10, pp.1795-1808

Abstract

Supervised
thesis

2017

Dosimetric effects of clinical setup mismatch in Volumetric Modulated Arc Therapy as assessed by Monte Carlo methods

Author
Ricardo José Pires Magalhães

Institution
UP-FCUP

2015

GPU- Accelerated Optical Coherence Tomography Signal Processing and Visualization

Author
Seyed Hamid Hosseiny Darbrazi

Institution
UP-FCUP