Banca de DEFESA: LUIZ GUILHERME DE CASTRO SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LUIZ GUILHERME DE CASTRO SANTOS
DATE: 09/11/2023
TIME: 14:00
LOCAL: Sala 205 do Bloco Zeta do Campus São Bernardo da Universidade Federal do ABC
TITLE:

RF COIL DEVELOPMENT FOR MAGNETIC RESONANCE IMAGING OF THE KNEE AT 7-TESLA CLINICAL SCANNER

 

PAGES: 142
BIG AREA: Engenharias
AREA: Engenharia Biomédica
SUBÁREA: Engenharia Médica
SPECIALTY: Transdutores para Aplicações Biomédicas
SUMMARY:

Magnetic resonance imaging (MRI) is a powerful diagnostic technique, allowing detailed visualization of soft tissues and organs without the use of ionizing radiation. This project focused on the design and development of a birdcage RF coil to improve the quality of knee MRI at ultra-high magnetic field (≥7T). Simulations were performed using Birdcage Builder software to estimate coil parameters, followed by electrical simulations in Advanced Design System (ADS) and electromagnetic simulations in XFDTD REMCOM to optimize coil performance in terms of RF field homogeneity. The results indicate that parameters such as field non-uniformity and relative uniformity can be estimated by simulations, while peak-to-peak inhomogeneity could not. Bench characterization of the coil, using a vector network analyzer (VNA), provided essential information about its intrinsic resistance. In addition, detailed drawings of the mechanical parts were made in SolidWorks, with manufacturing using 3D printing. The birdcage was tested in linear polarization with oil phantoms and compared to a commertial coil from SIEMENS. Although it showed lower image homogeneity compared to the commertial coil, our design presented a significantly higher signal-to-noise ratio (SNR). In vivo MRI acquitisions demonstrated the birdcage's capability to distinguish different tissues of the human knee. Furthermore, simulations were carried out in the ADS software to build a circuit that will allow quadrature polarization of the coil. One version of the circuit was built and characterized on a bench, demonstrating its operation. As future perspectives, it is planned to test the birdcage with the quadrature hybrid coupler/decoupler circuit and explore the construction of an eight-channel receive array for possible improvements and additional clinical applications.

COMMITTEE MEMBERS:
Presidente - Interno ao Programa - 1610505 - DANIEL PAPOTI
Membro Titular - Examinador(a) Interno ao Programa - 2231661 - JOAO LOURES SALINET JUNIOR
Membro Titular - Examinador(a) Externo ao Programa - 2418478 - JOHN ANDREW SIMS
Membro Suplente - Examinador(a) Interno ao Programa - 2188954 - ERICK DARIO LEON BUENO DE CAMARGO
Membro Suplente - Examinador(a) Interno ao Programa - 2123666 - FERNANDO SILVA DE MOURA
Membro Suplente - Examinador(a) Externo ao Programa - 2605683 - NASSER ALI DAGHASTANLI