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UID:20260625T162127EDT-4545Hk09ak@132.216.98.100
DTSTAMP:20260625T202127Z
DESCRIPTION:Abstract\n\nThe goal of this work has been to make head imaging
  more equitable\, and show that accommodative engineering designs benefit 
 all. In magnetic resonance imaging (MRI)\, most radio-frequency (RF) coils
  are designed such that the largest heads fit\, however this means that sm
 aller heads are undeserved in terms of sensitivity and ultimately signal-t
 o-noise ratio\, as the space between the surface of the head and of some o
 f the coil’s elements is larger. Adding adjustability to coils is a popula
 r approach\, however stability and signal-to-noise ratio often suffer\, ma
 king it self defeating.\n\nA 128-channel RF coil array for head MRI was de
 signed. The array is split up into sub-arrays that are built into semi-fle
 xible plates\, which were inspired by the cranial bones of the human head.
  The plates can be adjusted to fit different heads. The gaps between the p
 lates are bridged by ultra-flexible bowing suture elements which bend outw
 ards when the plates move inwards to accommodate a smaller head\, and flat
 ten out for larger heads as the plates move apart.\n\nAn average head surf
 ace model was segmented into eight 2-mm thick plates 3D-printed in flexibl
 e thermoplastic polyurethane (TPU) on which 35-mm diameter elements are th
 readed. A total of 104 channels are plate bound with the remaining 24 rese
 rved as bowing sutures.\n\nThis thesis presents the results of targeted te
 sts that demonstrate the feasibility and effectiveness of the 128-channel 
 design\, and the fully realized semi-flexible plate-bound 104-channel coil
 .\n\nIn MRI experiments on phantoms the 104-channel coil outperformed a co
 mmercial 64-channel head coil in terms of an average SNR by 1.45-fold and 
 at cortical depths as much as 4.33-fold. It also outperforms in terms of a
 ccelerated imaging\, specifically at higher R factors. For instance\, the 
 maximum g-factor of an R = 8 A-P acceleration was reduced by ≈40%\, and in
  an R = 4 × 4 acceleration\, there was a reduction of ≈58%.\n\nThe adjusta
 ble plate approach presented in this work shows that an equitable coil is 
 possible and has the potential to improve head imaging for all\, in terms 
 of imaging speed\, patient comfort\, and image quality.\n
DTSTART:20250319T180000Z
DTEND:20250319T200000Z
LOCATION:Room 603\, McConnell Engineering Building\, CA\, QC\, Montreal\, H
 3A 0E9\, 3480 rue University
SUMMARY:PhD defence of William Mathieu – A Size-Adaptable Flexible 128-Chan
 nel Receive-Only RF Coil Array for Brain 3-T MRI
URL:https://www.mcgill.ca/ece/channels/event/phd-defence-william-mathieu-si
 ze-adaptable-flexible-128-channel-receive-only-rf-coil-array-brain-3-t-363
 767
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