干旱区生态环境知识资源中心(Arid): RF heating of deep brain stimulation implants during MRI in 1.2 T vertical scanners versus 1.5 T horizontal systems: A simulation study with realistic lead configurations

Arid

	RF heating of deep brain stimulation implants during MRI in 1.2 T vertical scanners versus 1.5 T horizontal systems: A simulation study with realistic lead configurations
	Kazemivalipour, Ehsan; Vu, Jasmine; Lin, Stella; Bhusal, Bhumi; Bach Thanh Nguyen; Kirsch, John; Elahi, Behzad; Rosenow, Joshua; Atalar, Ergin; Golestanirad, Laleh
通讯作者	Golestanirad, L (corresponding author), Northwestern Univ, Dept Radiol, Feinberg Sch Med, Chicago, IL 60611 USA. ; Golestanirad, L (corresponding author), Northwestern Univ, Dept Biomed Engn, McCormick Sch Engn, Evanston, IL 60208 USA.
会议名称	42nd Annual International Conference of the IEEE-Engineering-in-Medicine-and-Biology-Society (EMBC)
会议日期	JUL 20-24, 2020
会议地点	Montreal, CANADA
英文摘要	Patients with deep brain stimulation (DBS) implants are often denied access to magnetic resonance imaging (MRI) due to safety concerns associated with RF heating of implants. Although MR-conditional DBS devices are available, complying with manufacturer guidelines has proved to be difficult as pulse sequences that optimally visualize DBS target structures tend to have much higher specific absorption rate (SAR) of radiofrequency energy than current guidelines allow. The MR-labeling of DBS devices, as well as the majority of studies on RF heating of conductive implants have been limited to horizontal close-bore MRI scanners. Vertical MRI scanners, originally introduced as open low-field MRI systems, are now available at 1.2 T field strength, capable of high-resolution structural and functional imaging. No literature exists on DBS SAR in this class of scanners which have a 90 degrees rotated transmit coil and thus, generate a fundamentally different electric and magnetic field distributions. Here we present a simulation study of RF heating in a cohort of forty patient-derived DBS lead models during MRI in a commercially available vertical openbore MRI system (1.2 T OASIS, Hitachi) and a standard horizontal 1.5 T birdcage coil. Simulations were performed at two major imaging landmarks representing head and chest imaging. We calculated the maximum of 0.1g-averaged SAR (0.1g-SARMax) around DBS lead tips when a B-1(+) = 4 mu T was generated on an axial plane passing through patients body. For head landmark, 0.1g-SARMax reached 220 +/- 188 W/kg in the 1.5 T birdcage coil, but only 14 +/- 11 W/kg in the OASIS coil. For chest landmark, 0.1g-SAR(Max) was 24 +/- 17 W/kg in the 1.5 T birdcage coil and 3.2 W/kg in the OASIS coil. A paired two-tail t-test revealed a significant reduction in SAR with a large effect-size during head MRI (p < 1.5x10(-8), Cohen's d = 1.5) as well as chest MRI (p < 6.5x10(-10), Cohen's d = 1.7) in 1.2 T Hitachi OASIS coil compared to a standard 1.5 T birdcage transmitter. Our findings suggest that open-bore vertical scanners may offer an untapped opportunity for MRI of patients with DBS implants.
来源出版物	42ND ANNUAL INTERNATIONAL CONFERENCES OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY: ENABLING INNOVATIVE TECHNOLOGIES FOR GLOBAL HEALTHCARE EMBC'20
ISSN	1557-170X
EISSN	1558-4615
出版年	2020
页码	6143-6146
ISBN	978-1-7281-1990-8
出版者	IEEE
类型	Proceedings Paper
语种	英语
开放获取类型	Green Published
收录类别	CPCI-S
WOS记录号	WOS:000621592206116
WOS关键词	ABSORPTION RATE ; BIRDCAGE ; SAR ; DESIGN ; SAFETY ; WIRES
WOS类目	Engineering, Biomedical ; Engineering, Electrical & Electronic
WOS研究方向	Engineering
资源类型	会议论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/353094
作者单位	[Kazemivalipour, Ehsan; Vu, Jasmine; Lin, Stella; Bhusal, Bhumi; Bach Thanh Nguyen; Golestanirad, Laleh] Northwestern Univ, Dept Radiol, Feinberg Sch Med, Chicago, IL 60611 USA; [Kazemivalipour, Ehsan; Atalar, Ergin] Bilkent Univ, Dept Elect & Elect Engn, Ankara, Turkey; [Kazemivalipour, Ehsan; Atalar, Ergin] Bilkent Univ, Natl Magnet Resonance Res Ctr UMRAM, Ankara, Turkey; [Vu, Jasmine; Golestanirad, Laleh] Northwestern Univ, Dept Biomed Engn, McCormick Sch Engn, Evanston, IL 60208 USA; [Kirsch, John] Massachusetts Gen Hosp, AA Martinos Ctr Biomed Imaging, Boston, MA 02114 USA; [Elahi, Behzad] Northwestern Univ, Dept Phys Therapy & Human Movement Sci, Feinberg Sch Med, Evanston, IL USA; [Rosenow, Joshua] Northwestern Univ, Feinberg Sch Med, Dept Neurol Surg, Chicago, IL 60611 USA
推荐引用方式 GB/T 7714	Kazemivalipour, Ehsan,Vu, Jasmine,Lin, Stella,et al. RF heating of deep brain stimulation implants during MRI in 1.2 T vertical scanners versus 1.5 T horizontal systems: A simulation study with realistic lead configurations[C]:IEEE,2020:6143-6146.