MR-guided percutaneous angioplasty: Assessment of tracking safety, catheter handling and functionality

Wildermuth, Simon; Dumoulin, Charles L.; Pfammatter, Thomas; Maier, Stephan E.; Hofmann, E.; Debatin, J. F.

doi:10.1007/s002709900288

Cited by 89 publications

(59 citation statements)

References 17 publications

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“…It also varies between different sequences and changes with the flip angle. Wildermuth et al [68] found sequences with higher duty cyles, as fast spin echo sequences, and high flip angles (90°) in gradient-recall echo sequences to cause most wire heating (18-20°C). However, studies using nitinol guidewires "off-label" did not show any harmful side effects caused by this heating in vivo, so its use is controversial [69].…”

Section: Safety Aspectsmentioning

confidence: 99%

MR-guided endovascular interventions: a comprehensive review on techniques and applications

et al. 2007

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The magnetic resonance (MR) guidance of endovascular interventions is probably one of the greatest challenges of clinical MR research. MR angiography is not only an imaging tool for the vasculature but can also simultaneously depict high tissue contrast, including the differentiation of the vascular wall and perivascular tissues, as well as vascular function. Several hurdles had to be overcome to allow MR guidance for endovascular interventions. MR hardware and sequence design had to be developed to achieve acceptable patient access and to allow real-time or near real-time imaging. The development of interventional devices, both applicable and safe for MR imaging (MRI), was also mandatory. The subject of this review is to summarize the latest developments in real-time MRI hardware, MRI, visualization tools, interventional devices, endovascular tracking techniques, actual applications and safety issues.

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Section: Safety Aspectsmentioning

confidence: 99%

MR-guided endovascular interventions: a comprehensive review on techniques and applications

et al. 2007

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“…MRI-based active catheter tracking methods [44,45] may suffer from practical limitations, such as hampered mechanical properties as well as tissue heating caused by the catheter RF-coils [46,47]. Passive tracking methods based on susceptibility-artifacts induced by dysprosium oxide markers depict dis-crete points along the catheter only [48], and the use of catheter contrast agents with short T 1 relaxation times may suffer from insufficient signal difference between catheter and surrounding tissue [49].…”

Section: Catheter Tracking and Visualizationmentioning

confidence: 99%

13C imaging—a new diagnostic platform

et al. 2005

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The evolution of magnetic resonance imaging (MRI) has been astounding since the early 1980s, and a broad range of applications has emerged. To date, clinical imaging of nuclei other than protons has been precluded for reasons of sensitivity. However, with the recent development of hyperpolarization techniques, the signal from a given number of nuclei can be increased as much as 100 000 times, sufficient to enable imaging of non-proton nuclei.Technically, imaging of hyperpolarized nuclei offers several unique properties, such as complete lack of background signal and possibility for local and permanent destruction of the signal by means of radio frequency (RF) pulses. These properties allow for improved as well as new techniques within several application areas. Diagnostically, the injected compounds can visualize information about flow, perfusion, excretory function, and metabolic status. In this review article, we explain the concept of hyperpolarization and the techniques to hyperpolarize 13 C. An overview of results obtained within angiography, perfusion, and catheter tracking is given, together with a discussion of the particular advantages and limitations. Finally, possible future directions of hyperpolarized 13 C MRI are pointed out.

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“…Placing a catheter with attached RF coils within the body may also produce harmful heating effects if pulse sequences with high RF duty cycles are used (25). In a recent study, tissue heating was eliminated with the use of a wireless self-resonating RF circuit inductively coupled to the transmitting body coil and a receiving surface coil as an active catheter-tracking device (20).…”

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confidence: 99%

Passive catheter tracking during interventional MRI using hyperpolarized ¹³C

Magnusson

Johansson

Månsson

et al. 2007

Magnetic Resonance in Med

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Interventional procedures in MRI can be performed preclinically using active or passive catheter-tracking methods. A novel passive nonproton technique is suggested that uses a catheter filled with a hyperpolarized 13 C contrast agent. A prototype three-lumen catheter was built with two closed lumens containing a flowing hyperpolarized 13 C contrast agent. Entire-length 13 C catheter projection visualization could be performed in vivo with a catheter SNR of ϳ80, one dual projection frame per ϳ700 ms, and an in-plane resolution of 2 ؋ 2 mm 2 while traveling through the aorta of a pig. The traveling path of the 13

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MR-guided percutaneous angioplasty: Assessment of tracking safety, catheter handling and functionality

Abstract: The in vivo use of an MR-tracking PTA catheter is safe under most scanning conditions.

Cited by 89 publications

References 17 publications

MR-guided endovascular interventions: a comprehensive review on techniques and applications

MR-guided endovascular interventions: a comprehensive review on techniques and applications

13C imaging—a new diagnostic platform

Passive catheter tracking during interventional MRI using hyperpolarized ¹³C

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MR-guided percutaneous angioplasty: Assessment of tracking safety, catheter handling and functionality

Abstract: The in vivo use of an MR-tracking PTA catheter is safe under most scanning conditions.

Cited by 89 publications

References 17 publications

MR-guided endovascular interventions: a comprehensive review on techniques and applications

MR-guided endovascular interventions: a comprehensive review on techniques and applications

13C imaging—a new diagnostic platform

Passive catheter tracking during interventional MRI using hyperpolarized 13C

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Product

Resources

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Passive catheter tracking during interventional MRI using hyperpolarized ¹³C