Interventional cardiac MRI using an add‐on parallel transmit MR system: In vivo experience in sheep

Godinez, Felipe; Tomi‐Tricot, Raphaël; Delcey, Marylène; Williams, Steven E.; Mooiweer, Ronald; Quesson, Bruno; Razavi, Reza; Hajnal, Joseph V.; Malik, Shaihan J.

doi:10.1002/mrm.28931

Cited by 3 publications

(2 citation statements)

References 43 publications

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“…These implant-friendly null modes have even been incorporated into pTx pulse design whereby electric field reduction and B 1 + field homogenization are optimized simultaneously (Eryaman et al 2015). Recent work has sought to rigorously safety check the use of pTx for mitigating implant and device heating before use in patients and has included realistic phantom experiments (Godinez et al 2019, McElcheran et al 2019, in vivo scans in sheep (Godinez et al 2021), and more accurate electromagnetic field device models (Guérin et al 2019). This active work suggests that this strategy of pTx in patients with implants could be realized in the near future.…”

Section: Pulse Accelerationmentioning

confidence: 99%

Ultra-high field MRI: parallel-transmit arrays and RF pulse design

2023

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This paper reviews the field of multiple or parallel radiofrequency (RF) transmission for magnetic resonance imaging (MRI). Currently the use of ultra-high field (UHF) MRI at 7 tesla and above is gaining popularity, yet faces challenges with non-uniformity of the RF field and higher RF power deposition. Since its introduction in the early 2000s, parallel transmission (pTx) has been recognized as a powerful tool for accelerating spatially selective RF pulses and combating the challenges associated with RF inhomogeneity at UHF. We provide a survey of the types of dedicated RF coils used commonly for pTx and the important modeling of the coil behavior by electromagnetic (EM) field simulations. We also discuss the additional safety considerations involved with pTx such as the specific absorption rate (SAR) and how to manage them. We then describe the application of pTx with RF pulse design, including a practical guide to popular methods. Finally, we conclude with a description of the current and future prospects for pTx, particularly its potential for routine clinical use.

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Section: Pulse Accelerationmentioning

confidence: 99%

Ultra-high field MRI: parallel-transmit arrays and RF pulse design

2023

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“…[46][47][48] One of the key challenges during many interventional MRI procedures is the risks associated with overheating, which threatens the safety of the patients. Numerous reports have been published concerning the heating of metallic components during the MR imaging; [49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65] therefore, a continuous in situ temperature monitoring is required for safe interventional MRI applications. MRI thermometry has been developed as an in situ temperature monitoring method.…”

mentioning

confidence: 99%

Radio Frequency Sensing‐Based In Situ Temperature Measurements during Magnetic Resonance Imaging Interventional Procedures

Bilgin

Tiryaki

Lazović

et al. 2022

Adv Materials Technologies

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attention in the medical robotics as a potential alternative to traditional 2D fluoroscopic imaging methods with the MRI's ionizing-radiation-free nature and 3D high-resolution soft tissue imaging capabilities. [1][2][3][4][5][6] By developing different MRI-based medical robot or device designs, such as MRI-compatible guide wires, [7,8] soft pneumatic actuators, [9,10] piezo actuators, [11,12] focused ultrasound (FUS) systems, [5,13,14] active catheters, [15,16] needle insertion systems, [4,17,18] and magnetic microrobots [19][20][21][22][23][24][25] and millirobots, [26][27][28][29] researchers have demonstrated promising interventional procedures, such as laser ablation, [30][31][32][33][34] local hyperthermia, [14,35,36] and FUS ablation. [13,34,37] The usage of MRI is mainly limited to the position tracking and the steering control of such medical robots or devices with fiducial markers based on radiofrequency (RF) markers, [3,[38][39][40][41][42] magnetic markers, [43][44][45] and contrast agents. [46][47][48] One of the key challenges during many interventional MRI procedures is the risks associated with overheating, which threatens the safety of the patients. Numerous reports have been published concerning the heating of metallic components during the MR imaging; [49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65] therefore, a continuous in situ temperature monitoring is required for safe interventional MRI applications. MRI thermometry has been developed as an in situ temperature monitoring method. [66][67][68][69] Researchers have used MRI thermometry-based temperature feedback to control FUS hyperthermia operations [35,36,70] or to evaluate MRI-guided laser ablation therapies [6,31,71] and MRIguided active catheters. [72,73] While MRI thermometry methods can provide accurate in situ temperature mapping in 3D, they decrease the overall MRI-based visual feedback rate by adding an extra sequence, hindering the real-time MRI feedback. In a different approach, some researchers have proposed RFbased telemetric devices for measuring the in situ temperature remotely. [74][75][76][77][78] However, such methods have included sophisticated circuitries and metallic components that may distort MR images. [79][80][81] Therefore, a safe method for in situ temperature monitoring without decreasing the MRI feedback rate is highly desirable inside the interventional MR scanners.Previously, various RF marker designs have been reported; however, their main focus has been on device 3D tracking inside MRI. [3,[38][39][40][41][42] Recent studies explored new designs for ensuring functionality independent of the marker orientation. [82][83][84] Beyond tracking, a recent study used an RF marker design Magnetic resonance imaging (MRI)-tuned radio-frequency (RF) sensors are used as a radiation-free alternative for tracking minimally invasive medical tool positions. However, in situ temperature sensing capabilities of the MRI-tuned RF sensors have not been thoroughly investigated yet. A self-resonating RF sensor c...

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Translating UHF advances to lower field strength

Webb

2023

Advances in Magnetic Resonance Technology and Applications

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Interventional cardiac MRI using an add‐on parallel transmit MR system: In vivo experience in sheep

Abstract: This is an open access article under the terms of the Creat ive Commo ns Attri bution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 3 publications

References 43 publications

Ultra-high field MRI: parallel-transmit arrays and RF pulse design

Ultra-high field MRI: parallel-transmit arrays and RF pulse design

Radio Frequency Sensing‐Based In Situ Temperature Measurements during Magnetic Resonance Imaging Interventional Procedures

Translating UHF advances to lower field strength

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