Multichannel Radio-Frequency Receive Coil Array for Pediatric Brain at 3T Magnetic Resonance Imaging
Date Issued
2014
Date
2014
Author(s)
Lee, Jo
Abstract
The aim of this thesis is to develop a multi-channel radio-frequency (RF) receive coil array applicable to pediatric brains on a 3T magnetic resonance imaging (MRI) system. The helmet of the array was designed to fit 7-year-old children’s head and neck in order to improve the signal-to-noise ratio. The array consisted of 32 circular surface coils. All coils had 8 cm diameter and were evenly distributed. By optimally overlapping adjacent coils and using low input-impedance preamplifiers, we reduced the coupling between coils efficiently. The average of S12 from bench measurement was -14dB (minimum = -28dB). This array was used to acquire brain static and dynamic MRI. Images were compared with those from a 32-channel adult head coil array. We found that the ratio of SNR between the image from the pediatric array and that from the adult array at the periphery of the head was 1.85, and nearly the same in the center of the head. In dynamic MRI scans, the mean of temporal SNR (tSNR) of the data acquired from a pediatric array was 120% of that of the data acquired from an adult array. We conclude that our multi-channel RF receiving coil array can provide high SNR and tSNR pediatric brain magnetic resonance images.
Subjects
相位線圈
射頻接收線圈
磁共振平行影像
幼兒頭部線圈
Type
thesis
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