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• Clinical Article •
Double-phase three-dimensional double-phase contrast-enhanced magnetic resonance angiography of long-range aortic dissection: technique and clinical value of two-stop scan on 3.0 T
PAN Bi-tao  PAN Xi-min  HU Mei-yu  JIANG Bo 

DOI:10.3969/j.issn.1674-8034.2015.11.004.


[Abstract] Objective: To evaluate the operating feature and diagnostic usefulness of two-stop double-phase 3D CEMRA of long-range aortic dissection (AD) on 3.0 T.Materials and Methods: The transit time (TT) test and 3D FLASH-turbo MRA-sequence 3D CEMRA of 2 consecutive phases were prospectively performed in 14 patients with long-range AD. The differences between true and false lumens were compared in the aspects of TT, signal intensity of peak enhancement (SPE), and intensities on 3D CEMRA. MIP and MPR images of double-phase 3D CEMRA were employed to observe the dynamic visualization of true and false lumens, and to assess intimal entrance tear and relationship between abdominal aortic branch and lumens of AD. The findings in double-phase 3D CEMRA were correlated with those found in DSA.Results: The TT of true and false lumens was (13.4±4.8) s, (17.5±4.7) s, respectively, differing significantly (P<0.01). The SPE of true and false lumens was 108.7±28.4, 83.5±39.3, respectively, which differed significantly (P<0.05). The intensity of true and false lumens on double-phase 3D CEMRA was 391.4±83.7, 142.9±77.2, respectively, and different significantly (P<0.01) in 1st phase; 225.0±66.1, 231.6±80.0, respectively, with no difference (P>0.50) in 2nd phase. Dynamic visualization of true and false lumens of AD was displayed on double-phase 3D CEMRA: the whole-length visualization was noted in true lumen while segmented visualization in false lumen in 1st phase, signal subsidence was revealed on true lumen and whole-length visualization on false lumen in 2nd phase. Twenty-three intimal entrance tears were detected in double-phase 3D CEMRA 14 of which located closely distal to orifice of left subclavian artery, 5 at supra-phrenic descending aorta, and 4 at abdominal aorta. Jet sign was demonstrated in 8 tears. The number and location of tears detected on double-phase 3D CEMRA coincided completely with those on aortic DSA. Five left renal arteries, 3 right renal arteries and 1 celiac trunk were noted originating from false lumen.Conclusions: Two-stop double-phase 3D CEMRA could be used in diagnosing long-range AD on 3T, and the technical essentials of which comprise TT test and double-phase scan based on hemodynamic difference between both lumens of AD.
[Keywords] Aortic aneurysm；Magnetic resonance angiography；Tendencies

PAN Bi-tao Department of Diagnostic Radiology, Sun Yat-Sen University the First Affiliated Hospital, Guangzhou 510080, China

PAN Xi-min Department of Radiology of East Hospital, Sun Yat-Sen University the First Affiliated Hospital, Guangzhou 510700, China

HU Mei-yu Department of Radiology of East Hospital, Sun Yat-Sen University the First Affiliated Hospital, Guangzhou 510700, China

JIANG Bo* Department of Diagnostic Radiology, Sun Yat-Sen University the First Affiliated Hospital, Guangzhou 510080, China

*Correspondence to: Jiang B, E-mail: csujbo@163.com

Conflicts of interest   None.

Received  2015-09-07
Accepted  2015-10-10
DOI: 10.3969/j.issn.1674-8034.2015.11.004
DOI:10.3969/j.issn.1674-8034.2015.11.004.

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