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Watanabe Y, Nagayama M, Sakata A, et al. Evaluation of Fibrous Cap Rupture of Atherosclerotic Carotid Plaque with Thin-Slice Source Images of Time-of-Flight MR Angiography. Ann Vasc Dis. 2014;7(2):127-33doi: 10.3400/avd.oa.13-00101.
Watanabe, Y., Nagayama, M., Sakata, A., Okumura, A., Amoh, Y., Ishimori, T., Nakashita, S., & Dodo, Y. (2014). Evaluation of Fibrous Cap Rupture of Atherosclerotic Carotid Plaque with Thin-Slice Source Images of Time-of-Flight MR Angiography. Annals of vascular diseases, 7(2), 127-33. https://doi.org/10.3400/avd.oa.13-00101
Watanabe, Yuji, et al. "Evaluation of Fibrous Cap Rupture of Atherosclerotic Carotid Plaque with Thin-Slice Source Images of Time-of-Flight MR Angiography." Annals of vascular diseases vol. 7,2 (2014): 127-33. doi: https://doi.org/10.3400/avd.oa.13-00101
Watanabe Y, Nagayama M, Sakata A, Okumura A, Amoh Y, Ishimori T, Nakashita S, Dodo Y. Evaluation of Fibrous Cap Rupture of Atherosclerotic Carotid Plaque with Thin-Slice Source Images of Time-of-Flight MR Angiography. Ann Vasc Dis. 2014;7(2):127-33. doi: 10.3400/avd.oa.13-00101. Epub 2014 May 16. PMID: 24995056; PMCID: PMC4072860.
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Ann Vasc Dis. 2014;7(2):127-33. doi: 10.3400/avd.oa.13-00101. Epub 2014 May 16.

Evaluation of Fibrous Cap Rupture of Atherosclerotic Carotid Plaque with Thin-Slice Source Images of Time-of-Flight MR Angiography.

Annals of vascular diseases

Yuji Watanabe, Masako Nagayama, Akihiko Sakata, Akira Okumura, Yoshiki Amoh, Takayoshi Ishimori, Satoru Nakashita, Yoshihiro Dodo

Affiliations

  1. Department of Radiology, Kurashiki Central Hospital, Kurashiki, Okayama, Japan.

PMID: 24995056 PMCID: PMC4072860 DOI: 10.3400/avd.oa.13-00101

Abstract

OBJECTIVE: To investigate the ability of source image of time-of-flight magnetic resonance angiography (TOF-MRA) in the detection of fibrous cap rupture of atherosclerotic carotid plaques.

MATERIALS AND METHODS: From the database of radiological information in our hospital, 35 patients who underwent carotid MR imaging and subsequent carotid endoarterectomy within 2 weeks were included in this retrospective study. MR imaging included thin-slice time-of-flight MR angiography, black-blood T1- and T2-weighted imaging. Sensitivity, specificity and accuracy were calculated for the detection of fibrous cap rupture with source image of TOF-MRA. The Cohen k coefficient was also calculated to quantify the degree of concordance of source image of TOF-MRA with histopathological data.

RESULTS: Sensitivity, specificity and accuracy in the detection of fibrous cap rupture were 90% (95%CI: 81-98), 69% (95%CI: 56-82) and 79% (95%CI: 71-87) with a k value of 0.59. The false positives (n = 15) were caused by partial-volume averaging between fibrous cap and lumen at the shoulder of carotid plaque. The false negatives (n = 5) were underestimated as partial thinning of fibrous cap.

CONCLUSION: Source image of TOF-MRA can be useful in the detection of fibrous cap rupture with high sensitivity, but further technical improvement should be necessary to overcome shortcomings causing image degradation.

Keywords: MR imaging; atherosclerotic plaque; carotid artery; fibrous cap; time of flight MR angiography

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