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Karaktärisering av 8-kanals transmitsystem

Moreau Bruun, Yann LU (2019) BMEM01 20191
Department of Biomedical Engineering
Abstract
Ultra high magnetic field (UHF) MR-systemsis an interesting research area, the systems offer images with higher spatial resolution than its lower field counterpart. One of the disadvantages with UHF MR is that they lead to a worsened B1-field homogenity, a homogentity essential for the creation of MR-images. In the project an 8 independent channel transmit system is charachterised. The transmit system offers the oppurtunity for B1-shimming for increased B1-homogenity. B1-mapping is the process of gathering information regarding the B1-field and in this project the fast DREAM-method is used. This mapping is essential for the four B1 shimmingtools (RPN, volextAP, adaptextAP, preset) being tested to be able to improve the homogenity. The... (More)
Ultra high magnetic field (UHF) MR-systemsis an interesting research area, the systems offer images with higher spatial resolution than its lower field counterpart. One of the disadvantages with UHF MR is that they lead to a worsened B1-field homogenity, a homogentity essential for the creation of MR-images. In the project an 8 independent channel transmit system is charachterised. The transmit system offers the oppurtunity for B1-shimming for increased B1-homogenity. B1-mapping is the process of gathering information regarding the B1-field and in this project the fast DREAM-method is used. This mapping is essential for the four B1 shimmingtools (RPN, volextAP, adaptextAP, preset) being tested to be able to improve the homogenity. The project’s data is gathered from 10 individuals on a 7T Philips MR-system, both with the classic coil acting as a reference and with the new 8 channel transmit coil (mtx8). The preprocessing have included the process of
aligning the data to MNI-space, a standarised brain, to simplify the data comparison. The results show a 50 % higher SNR for the classic coil which has a marginally smaller CNR than mtx8. Two of the B1-shimmingtools, adaptextAP and RPN, offered a subpar performance unlike volextAP and preset which gave interesting results that has to be analysed further. It is to early to draw any conclusions if mtx8 can replace the classic coil or not, but regarding the applications surrounding B1-shimming mtx8 is very interesting. (Less)
Popular Abstract (Swedish)
Utvärdering av en sändarspole med 8 oberoende kanaler på ett MR-system med hög fältstyrka

Magnetresonanstomografi med höga magnetfältsstyrkor har potential att skapa bilder med otrolig kontrast. För att kunna uppnå detta över hela hjärnan måste det ojämna utsända RF-fältet jämnas ut. Oberoende sändarelement tillhandahåller lösningen!
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author
Moreau Bruun, Yann LU
supervisor
organization
course
BMEM01 20191
year
type
H2 - Master's Degree (Two Years)
subject
language
Swedish
additional info
2019-12
id
8994891
date added to LUP
2021-10-18 10:18:10
date last changed
2021-10-18 10:18:10
@misc{8994891,
  abstract     = {{Ultra high magnetic field (UHF) MR-systemsis an interesting research area, the systems offer images with higher spatial resolution than its lower field counterpart. One of the disadvantages with UHF MR is that they lead to a worsened B1-field homogenity, a homogentity essential for the creation of MR-images. In the project an 8 independent channel transmit system is charachterised. The transmit system offers the oppurtunity for B1-shimming for increased B1-homogenity. B1-mapping is the process of gathering information regarding the B1-field and in this project the fast DREAM-method is used. This mapping is essential for the four B1 shimmingtools (RPN, volextAP, adaptextAP, preset) being tested to be able to improve the homogenity. The project’s data is gathered from 10 individuals on a 7T Philips MR-system, both with the classic coil acting as a reference and with the new 8 channel transmit coil (mtx8). The preprocessing have included the process of
aligning the data to MNI-space, a standarised brain, to simplify the data comparison. The results show a 50 % higher SNR for the classic coil which has a marginally smaller CNR than mtx8. Two of the B1-shimmingtools, adaptextAP and RPN, offered a subpar performance unlike volextAP and preset which gave interesting results that has to be analysed further. It is to early to draw any conclusions if mtx8 can replace the classic coil or not, but regarding the applications surrounding B1-shimming mtx8 is very interesting.}},
  author       = {{Moreau Bruun, Yann}},
  language     = {{swe}},
  note         = {{Student Paper}},
  title        = {{Karaktärisering av 8-kanals transmitsystem}},
  year         = {{2019}},
}