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Modulated flip angle techniques in refocused imaging with extended echo train for diagnosing lower extremity arteriosclerosis obliterans
WANG Peng  PENG Ruchen  ZHANG Ling  ZHONG Jiali 

Cite this article as: Wang P, Peng RC, Zhang L, et al. Modulated flip angle techniques in refocused imaging with extended echo train for diagnosing lower extremity arteriosclerosis obliterans[J]. Chin J Magn Reson Imaging, 2022, 13(1): 126-129. DOI:10.12015/issn.1674-8034.2022.01.026.

[Abstract] Objective To investigate the diagnostic value of magnetic resonance modulated flip angle techniques in refocused imaging with extended echo train (MATRIX) for lower extremity arteriosclerosis obliterans (ASO), to provide a new imaging method for the visualization and accurate diagnosis of lower extremity ASO.Materials and Methods: Twenty-two cases of lower extremity ASO were continuously included. Bilateral lower extremities of all the patients underwent digital subtraction angiography (DSA) and MRI (T1-MATRIX and T2-MATRIX sequences). Measure muscle signal-to-noise ratio (SNR) and thrombus-vessel contrast signal-to-noise ratio (CNR) of T1-MARIX and T2-MARIX. The differences and inter-observer consistency in image quality and diagnostic confidence were analyzed. DSA was used as the reference to calculate the diagnostic accuracy of MATRIX sequences for the detection of thrombus.Results In 22 patients with lower extremity ASO (211 vessels), occlusion caused by thrombosis and plaque was found in 68 vessels. Using DSA diagnosis as the reference criteria, the sensitivity, specificity, accuracy of detection, positive predictive value, and negative predictive value of lower extremity ASO in MATRIX at the level of vascular segments were 90.63%, 93.20%. 92.56%, 85.29% and 95.80%, respectively. The interobserver agreements in image quality and diagnostic confidence of the MATRIX sequences were excellent (ICC≥0.75, P<0.05).Conclusions MATRIX can realize contrast-free examination and imaging of lower extremity ASO, and can carry out definite diagnosis. It has high image quality and diagnostic efficiency, and can be applied to clinical practice.
[Keywords] lower extremity arteriosclerosis obliterans;magnetic resonance imaging;black blood thrombus imaging;modulated flip angle technique in refocused imaging with extended echo train;imaging examinations

WANG Peng   PENG Ruchen   ZHANG Ling   ZHONG Jiali  

Department of Radiology, Beijing Luhe Hospital, Capital Medical University, Beijing 101199, China

Peng RC, E-mail:

Conflicts of interest   None.

Received  2021-07-19
Accepted  2021-11-26
DOI: 10.12015/issn.1674-8034.2022.01.026
Cite this article as: Wang P, Peng RC, Zhang L, et al. Modulated flip angle techniques in refocused imaging with extended echo train for diagnosing lower extremity arteriosclerosis obliterans[J]. Chin J Magn Reson Imaging, 2022, 13(1): 126-129. DOI:10.12015/issn.1674-8034.2022.01.026.

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