Improving image quality in transcranial magnetic resonance guided focused ultrasound using a conductive screen.
Improving image quality in transcranial magnetic resonance guided focused ultrasound using a conductive screen.
复制标题
使用导电屏提高经颅磁共振引导聚焦超声的图像质量。
DOI：
10.1016/j.mri.2021.07.002
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发表时间：
2021-11
影响因子：
2.5
通讯作者：
Parker DL
中科院分区：
文献类型：
--
作者：
Hadley JR;Odéen H;Merrill R;Adams SI;Rieke V;Payne A;Parker DL
经颅磁共振引导的聚焦超声(TcMRgFUS)已被证明是治疗一些神经系统疾病的有效方法，如原发性震颤和帕金森震颤。然而，在3特斯拉(3T)频率的磁共振引导下，使用TcMRgFUS所需的大型半球换能器会导致通过大脑关键区域的人造低信号频段。这项工作的目的是调查圆形导电射频(RF)屏幕的使用，该屏幕在一个方向上弯曲成12厘米半径，定位在头部顶部或后面附近，以减少或消除TcMRgFUS中这些人为的低信号频段。在成像实验和电磁模拟中，研究了使用射频屏幕去除这些低信号频带的影响。在TcMRgFUS系统的加热研究中，将水听器测量直径2 mm的青铜方形网屏的声透明度与使用和不使用网屏时的温度测量进行了比较。成像和仿真研究都表明，对于本文研究的不同屏幕配置，RF屏幕去除了低信号频段，并提高了整个脑区的均匀性和信噪比(SNR)。水听器和加热研究表明，即使是2毫米的铁丝网也能对超声波束提供最小的衰减。模拟结果还表明，1厘米的网格将以更小的超声衰减提供足够的伪影抑制。在3T MR环境中破坏换能器的自然波导性的RF屏幕可以改变电磁场分布，以减少不需要的伪影，并在整个大脑提供更均匀和更高SNR的成像区域。
Transcranial Magnetic Resonance guided Focused Ultrasound (TcMRgFUS) has been proven to be an effective treatment for some neurological disorders such as essential and Parkinson’s tremor. However, magnetic resonance guidance at 3 Tesla (3T) frequencies and using the large hemispherical transducers required for TcMRgFUS results in artifactual low-signal bands that pass through key regions of the brain. The purpose of this work was to investigate the use of a circular conductive Radio Frequency (RF) screen, that is bent to have a 12 cm radius in one direction and positioned near the top or back of the head, to reduce or remove these artifactual low-signal bands in TcMRgFUS. The impact of using an RF screen to remove these low signal bands was studied in both imaging experiments and electromagnetic simulations. Hydrophone measurements of the acoustic transparency of the bronze 2 mm diameter square mesh screen used in the imaging studies were compared with temperature measurements with and without the screen in heating studies in the TcMRgFUS system. The imaging and simulation studies both show that for the different screen configurations studied in this work, RF screen removes the low-signal bands and increases both homogeneity and signal-to-noise ratio (SNR) throughout the region of the brain. Hydrophone and heating studies indicate that even a 2 mm wire mesh provides minimal attenuation to the ultrasound beam. Simulation results also suggest that a 1 cm mesh will provide adequate artifact suppression with even less ultrasound attenuation. An RF screen that disrupts the natural waveguide nature of the transducer in the 3T MR environment can change the electromagnetic field profile to reduce unwanted artifacts and provide an imaging region which has more homogeneity and higher SNR throughout the brain.
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影响因子：
3.3
作者：
Collins, CM;Yang, QX;Chen, W
通讯作者：
Chen, W
影响因子：
4.1
作者：
Jung, Na Young;Park, Chang Kyu;Chang, Jin Woo
通讯作者：
Chang, Jin Woo
DOI：
10.2463/mrms.mp.2019-0153
发表时间：
2021-03-01
期刊：
Magnetic resonance in medical sciences : MRMS : an official journal of Japan Society of Magnetic Resonance in Medicine
影响因子：
--
作者：
Kuwahara R;Kido A;Yajima R;Nishio N;Nakao K;Kurata Y;Tanaka S;Minamiguchi S;Baba T;Mandai M;Togashi K
通讯作者：
Togashi K
影响因子：
4.3
作者：
Kim, Se Joo;Roh, Daeyoung;Chang, Jin Woo
通讯作者：
Chang, Jin Woo
影响因子：
16.2
作者：
Folloni, Davide;Verhagen, Lennart;Sallet, Jerome
通讯作者：
Sallet, Jerome