Autoperfused balloon catheter for intravascular MR imaging

Quick, Harald H.; Ladd, Mark E.; Hilfiker, Paul R.; Paul, Gesine G.; Ha, Suk-Woo; Debatin, Jörg F.

doi:10.1002/(sici)1522-2586(199903)9:3<428::aid-jmri10>3.0.co;2-e

Cited by 34 publications

(18 citation statements)

References 36 publications

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“…By applying these equations to Eq. [6], the other components of the electric and magnetic fields can be calculated as follows: where Ј ϭ ( ϩ j ε) ϭ j␤ 2 / , and: …”

Section: Appendix Amentioning

confidence: 99%

Evaluation of internal MRI coils using ultimate intrinsic SNR

Çelik

Eryaman

Altintas

et al. 2004

Magnetic Resonance in Med

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The upper bounds of the signal-to-noise ratio (also known as the "ultimate intrinsic signal-to-noise ratio" (UISNR)) for internal and external coils were calculated. In the calculation, the body was modeled as a dielectric cylinder with a small coaxial cylindrical cavity in which internal coils could be placed. The calculated UISNR values can be used as reference solutions to evaluate the performance of internal MRI coils. As examples, we evaluated the performance of a loopless antenna and an endourethral coil design by comparing their ISNR with the UISNR. Magn Reson Med 52:640 -649, 2004.

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“…By applying these equations to Eq. [6], the other components of the electric and magnetic fields can be calculated as follows: where Ј ϭ ( ϩ j ε) ϭ j␤ 2 / , and: …”

Section: Appendix Amentioning

confidence: 99%

Evaluation of internal MRI coils using ultimate intrinsic SNR

Çelik

Eryaman

Altintas

et al. 2004

Magnetic Resonance in Med

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show abstract

“…The time needed to collect images with such high resolution can amount to several minutes, making this approach unsuitable for vessels such as the carotids and coronary arteries. A possible solution may lie in the use of auto-perfused balloon imaging catheters [56], similar to those used for PTCA. During imaging with the balloon-mounted coil, blood flow is maintained through the guidewire lumen running coaxially through the balloon.…”

Section: Intravascular Imaging Coils: the Invasive Approach To Vesselmentioning

confidence: 99%

MR imaging of the vessel wall

2001

Self Cite

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Since the risks for thrombosis are more dependent on plaque composition than on the degree of luminal narrowing, the radiological assessment of atherosclerosis should extend beyond mere depiction of the arterial lumen. High-resolution MRI of the vessel wall can provide important information about the individual makeup of atherosclerotic plaques, potentially enabling early detection and characterization of lesions before narrowing of the vessel lumen occurs. The MR-based assessment of the vessel wall with sufficient spatial resolution and image contrast, however, remains challenging. Requirements include high signal-to-noise ratio, high contrast-to-noise ratio, good signal penetration depth and homogeneous signal throughout the vessel under investigation, as well as imaging protocols encompassing various contrast weightings. Numerous dedicated radiofrequency (RF) coils have been developed to achieve these goals employing either external surface phased-array coils, or alternatively, utilizing intravascular coils to image the vessel wall from inside the vessel and thus being invasive. For the non-invasive approach of imaging with surface coils, the carotid and the right coronary arteries have been favoured since they are of critical importance and since they are relatively superficial structures, accessible from the outside. To detect the early development of plaque and visualize it globally rather than locally, intravascular contrast agents on the basis of ultrasmall particles of iron oxide can be used as a marker of macrophage activity within the plaque. In the long run, it appears likely that the combination of luminal MR angiography with the administration of susceptibility-based contrast agents and subsequent high-resolution MR of detected atherosclerotic lesions with dedicated RF coils could evolve as the diagnostic concept of choice for the assessment of atherosclerotic disease.

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“…Weitere Entwicklungen beinhalten intravaskuläre Oberflächenspulen, die direkte Informationen z.B. über die Plaquemorphologie bei arteriosklerotischen Veränderun-gen geben können [41]. Als Vorteil der MR-Überwachung vaskulärer Interventionen ist auch die Möglichkeit der direkten Information über Fluß-und Perfusionsverhältnisse zu werten.…”

Section: Mr-stereotaxieunclassified

MR-geführte Eingriffe

1999

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The spectrum of MR imaging-guided interventions includes biopsies, thermal ablation modalities, vascular applications, MR endoscopy and intraoperative MR imaging. The concept of MR guidance is based on the excellent morphologic and functional imaging achieved by MR. The most important recently published experimental and clinical results are discussed. In the future, MR imaging will play an important role in interventional radiology, minimal invasive therapy and guidance of surgical procedures.

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Autoperfused balloon catheter for intravascular MR imaging

Cited by 34 publications

References 36 publications

Evaluation of internal MRI coils using ultimate intrinsic SNR

Evaluation of internal MRI coils using ultimate intrinsic SNR

MR imaging of the vessel wall

MR-geführte Eingriffe

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