Banca de QUALIFICAÇÃO: LUIZ GUILHERME DE CASTRO SANTOS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : LUIZ GUILHERME DE CASTRO SANTOS
DATE: 30/03/2023
TIME: 15:00
LOCAL: link do m=google meets (https://meet.google.com/hta-uvss-mnu)
TITLE:

Development of a transmit/receive RF coil for knee MRI at 7 Tesla.

PAGES: 64
BIG AREA: Engenharias
AREA: Engenharia Biomédica
SUBÁREA: Engenharia Médica
SPECIALTY: Transdutores para Aplicações Biomédicas
SUMMARY:

Radiofrequency (RF) coils are one of the main parts of MRI imaging equipment. When we take a shoulder or knee MRI scan, we are positioned by health professionals inside the equipment and around the region of interest is placed the receiving RF coil, since in the clinical equipment there is a dedicated transmitting RF coil that we don’t see because it is inside the machine. The coils are like a kind of lens in the system, they emit an electromagnetic field oscillating at the Larmor frequency of the hydrogen present in our body and also collect their signal to form an image. There are many coil geometries available, however one of the most advantageous in producing homogeneous oscillating field throughout is the birdcage coil and is the most common geometry used in modern clinical equipment. Ultra-high field equipment does not have a dedicated RF transmitter coil, because besides the energy dissipated over the patient being too high for these cases, the strong dielectric interferences of the tissues end up hindering the excitation of the spins. For this reason they work with local RF coils, being them signal transmitters, receivers or even transceivers. The following work shows the design, development and characterization of a Birdcage RF coil for ultra-high-field clinical imaging of the human knee. Electrical and electromagnetic simulations were performed, and a real prototype was built. Image acquisitions with the prototype were performed with phantons and on a human volunteer, which allowed comparison of the results of the simulations with the data obtained with the prototype. The RF coil proved to be efficient in producing a homogeneous magnetic field and was able to produce images with clinical diagnostic power of the human knee. The project is still under development and future perspectives include operating the coil in quadrature, which will reduce the power used in its polarization.

COMMITTEE MEMBERS:
Presidente - Interno ao Programa - 2249434 - TIAGO RIBEIRO DE OLIVEIRA
Membro Titular - Examinador(a) Interno ao Programa - 2188954 - ERICK DARIO LEON BUENO DE CAMARGO
Membro Titular - Examinador(a) Externo ao Programa - 2418478 - JOHN ANDREW SIMS
Membro Suplente - Examinador(a) Interno ao Programa - 2123676 - OLAVO LUPPI SILVA
Membro Suplente - Examinador(a) Externo ao Programa - 2605683 - NASSER ALI DAGHASTANLI