Vertical open-bore MRI scanners generate significantly less radiofrequency heating around implanted leads: A study of deep brain stimulation implants in 1.2T OASIS scanners versus 1.5T horizontal systems.
Vertical open-bore MRI scanners generate significantly less radiofrequency heating around implanted leads: A study of deep brain stimulation implants in 1.2T OASIS scanners versus 1.5T horizontal systems.
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垂直开孔MRI扫描仪在植入电极导线周围产生的射频发热显著减少：1.2T OASIS扫描仪与1.5T水平系统中脑深部电刺激植入物的研究。
DOI：
10.1002/mrm.28818
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发表时间：
2021-09
影响因子：
3.3
通讯作者：
Golestanirad L
中科院分区：
文献类型：
--
作者：
Kazemivalipour E;Bhusal B;Vu J;Lin S;Nguyen BT;Kirsch J;Nowac E;Pilitsis J;Rosenow J;Atalar E;Golestanirad L
由于与电极射频加热相关的安全问题，具有脑深部刺激(DBS)设备等主动植入物的患者经常被拒绝访问MRI。大多数关于导电植入物的射频加热的研究都是在水平近孔磁共振扫描仪中进行的。垂直MRI扫描仪具有90°旋转的传输线圈，会产生根本不同的电场和磁场分布，但对此类扫描仪中植入物的射频加热知之甚少。我们进行了数值模拟和体模实验，比较了1.2T垂直扫描仪(OASIS，日立)和1.5T水平扫描仪(AERA，西门子)中DBS植入物的射频加热。对90个导联模型进行了模拟，这些模型是从DBS植入患者的术后CT图像中创建的。实验是用电线和商业DBS设备植入一个拟人化的体模进行的。我们发现，与1.5T传统扫描仪相比，1.2T垂直扫描仪的0.1g平均比吸收率(30倍，P<；1×10−5)和射频加热(9倍，P<；0.026)显著降低。垂直MRI扫描仪似乎在DBS导联周围产生较低的射频加热，提供了潜在的更高的安全性或灵活性，以使用比传统系统更高功率水平的序列。
Patients with active implants such as deep brain stimulation (DBS) devices are often denied access to MRI due to safety concerns associated with the radiofrequency (RF) heating of their electrodes. The majority of studies on RF heating of conductive implants have been performed in horizontal close-bore MRI scanners. Vertical MRI scanners which have a 90° rotated transmit coil generate fundamentally different electric and magnetic field distributions, yet very little is known about RF heating of implants in this class of scanners. We performed numerical simulations as well as phantom experiments to compare RF heating of DBS implants in a 1.2T vertical scanner (OASIS, Hitachi) compared to a 1.5T horizontal scanner (Aera, Siemens). Simulations were performed on 90 lead models created from post-operative CT images of patients with DBS implants. Experiments were performed with wires and commercial DBS devices implanted in an anthropomorphic phantom. We found significant reduction of 0.1 g-averaged specific absorption rate (30-fold, P < 1 × 10−5) and RF heating (9-fold, P < .026) in the 1.2T vertical scanner compared to the 1.5T conventional scanner. Vertical MRI scanners appear to generate lower RF heating around DBS leads, providing potentially heightened safety or the flexibility to use sequences with higher power levels than on conventional systems.
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影响因子：
4.1
作者：
Cui, Zhiqiang;Pan, Longsheng;Ling, Zhipei
通讯作者：
Ling, Zhipei
影响因子：
3.3
作者：
Golestanirad L;Rahsepar AA;Kirsch JE;Suwa K;Collins JC;Angelone LM;Keil B;Passman RS;Bonmassar G;Serano P;Krenz P;DeLap J;Carr JC;Wald LL
通讯作者：
Wald LL
影响因子：
4.4
作者：
Collins, CM;Liu, WZ;Smith, MB
通讯作者：
Smith, MB
影响因子：
5.7
作者：
Golestanirad L;Iacono MI;Keil B;Angelone LM;Bonmassar G;Fox MD;Herrington T;Adalsteinsson E;LaPierre C;Mareyam A;Wald LL
通讯作者：
Wald LL
影响因子：
3.3
作者：
Golestanirad, Laleh;Keil, Boris;Angelone, Leonardo M.;Bonmassar, Giorgio;Mareyam, Azma;Wald, Lawrence L.
通讯作者：
Wald, Lawrence L.