High resolution intravascular MRI and MRS by using a catheter receiver coil

Atalar, Ergin; Bottomley, Paul A.; Ocali, Ogan; Correia, Luís Cláudio Lemos; Kelemen, Mark D.; Lima, João A.C.; Zerhouni, Elias A.

doi:10.1002/mrm.1910360415

Cited by 166 publications

(122 citation statements)

References 22 publications

Supporting

Mentioning

121

Contrasting

Unclassified

Order By: Relevance

“…The imaging protocol was based on optimal sequences reported in studies of human carotid arteries by surface MRI 4 and in investigations of tissue samples and animals in vivo by IVMRI. 5,6 Accordingly, the protocol consisted of a T1w spin-echo sequence (TR, 500 ms; TE, 13 ms), a moderately T2w fast-spin-echo sequence (TR, 2550 ms; TE, 50 ms; echo train length, 8), and a PDw fast-spin-echo sequence (TR, 2550 ms; TE, 12 ms; echo train length, 8). All ex vivo intravascular MRI was performed with a slice thickness of 2 mm and skip of 1 mm.…”

Section: Ivmri Coil and Ex Vivo Imaging Protocolmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of Human Atherosclerotic Plaques by Intravascular Magnetic Resonance Imaging

et al. 2005

View full text Add to dashboard Cite

Background-Development and validation of novel imaging modalities to assess the composition of human atherosclerotic plaques will improve the understanding of atheroma evolution and could facilitate evaluation of therapeutic strategies for plaque modification. Surface MRI can characterize tissue content of carotid but not deeper arteries. This study evaluated the usefulness of intravascular MRI (IVMRI) to discern the composition of human iliac arteries in vivo. Methods and Results-Initial studies validated IVMRI against histopathology of human atherosclerotic arteries ex vivo.A 0.030-inch-diameter IVMRI detector coil was advanced into isolated human aortoiliac arteries and coupled to a 1.5-T scanner. Information from combined T1-, moderate T2-, and proton-density-weighted images differentiated lipid, fibrous, and calcified components with favorable sensitivity and specificity and allowed accurate quantification of plaque size. The validated approach was then applied to image iliac arteries of 25 human subjects in vivo, and results were compared with those of intravascular ultrasound (IVUS). IVMRI readily visualized inner and outer plaque boundaries in all arteries, even those with extensive calcification that precluded IVUS interpretation. It also revealed the expected heterogeneity of atherosclerotic plaque content that was noted during ex vivo validation. Again, IVUS did not disclose this heterogeneity. The level of interobserver and intraobserver agreement in the interpretation of plaque composition was high for IVMRI but poor for IVUS. Conclusions-IVMRI can reliably identify plaque composition and size in arteries deep within the body. Identification of plaque components by IVMRI in vivo has important implications for the understanding and modification of human atherosclerosis.

show abstract

Section: Ivmri Coil and Ex Vivo Imaging Protocolmentioning

confidence: 99%

“…5,20 Such detectors are relatively flexible, enhance safety, and permit imaging over longer segments (up to 7 cm). Although the loopless antenna used here is too large to fit into the coronary arteries, it can be scaled down to the size of a coronary angioplasty guidewire (0.35 mm/0.014 inches).…”

Section: Larose Et Al Ivmri For Plaque Characterizationmentioning

confidence: 99%

Characterization of Human Atherosclerotic Plaques by Intravascular Magnetic Resonance Imaging

et al. 2005

View full text Add to dashboard Cite

show abstract

“…There are various types of disposable internal coils, such as opposed solenoids (3,4), expandable coils (5-8), elongated loops (9), and loopless antennas (10), for use in various body cavities, including the vagina, esophagus (11), urethra (12), blood vessels (10,13), and rectum (14). Although the SNR of MRI images increases when these coils are used, it is not possible to directly compare the performance of the internal coils with that of the external coils.…”

mentioning

confidence: 99%

Evaluation of internal MRI coils using ultimate intrinsic SNR

Çelik

Eryaman

Altintas

et al. 2004

Magnetic Resonance in Med

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…However, it is important to visualize the length of the catheter, particularly in cardiac catheterization, to prevent the formation of undesired loops. Promising methods for visualizing the entire catheter length, or multiple points along the catheter, using loopless antennae (13,14) or parallel resonant circuits distributed along the length of the catheter (15) have been proposed recently. However, it remains to be demonstrated whether these designs are suitable in terms of safety and mechanical stability.…”

mentioning

confidence: 99%