Non-contrast 3D black blood MRI for abdominal aortic aneurysm surveillance: comparison with CT angiography

Objectives Management of abdominal aortic aneurysms (AAAs) is based on diameter. CT angiography (CTA) is commonly used, but requires radiation and iodinated contrast. Non-contrast MRI is an appealing alternative that may allow better characterization of intraluminal thrombus (ILT). This study aims t...

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Bibliographic Details
Published in:European radiology 2017-05, Vol.27 (5), p.1787-1794
Main Authors: Zhu, Chengcheng, Tian, Bing, Leach, Joseph R., Liu, Qi, Lu, Jianping, Chen, Luguang, Saloner, David, Hope, Michael D.
Format: Article
Language:English
Subjects:
Abdomen
Aged
Aortic Aneurysm, Abdominal - diagnostic imaging
Aortic aneurysms
Blood clots
Computed Tomography Angiography
Contrast Media
Diagnostic Radiology
Disease Progression
Female
Humans
Imaging
Imaging, Three-Dimensional
Internal Medicine
Interventional Radiology
Magnetic Resonance Imaging
Male
Medical imaging
Medicine
Medicine & Public Health
Middle Aged
Neuroradiology
Radiation
Radiology
Reproducibility of Results
Retrospective Studies
Surveillance
Thrombosis - diagnostic imaging
Tomography
Ultrasonic imaging
Ultrasound
Vascular-Interventional
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Summary:Objectives Management of abdominal aortic aneurysms (AAAs) is based on diameter. CT angiography (CTA) is commonly used, but requires radiation and iodinated contrast. Non-contrast MRI is an appealing alternative that may allow better characterization of intraluminal thrombus (ILT). This study aims to 1) validate non-contrast MRI for measuring AAA diameter, and 2) to assess ILT with CTA and MRI. Method 28 patients with AAAs (diameter 50.7 ± 12.3 mm) underwent CTA and non-contrast MRI. MRI was acquired at 3 T using 1) a conventional 3D gradient echo (GRE) sequence and 2) a 3D T 1 -weighted black blood fast-spin-echo sequence. Two radiologists independently measured the AAA diameter. The ratio of signal of ILT and adjacent psoas muscle (ILT r  = signal ILT /signal Muscle ) was quantified. Results Strong agreement between CTA and non-contrast MRI was shown for AAA diameter (intra-class coefficient > 0.99). Both approaches had excellent inter-observer reproducibility (ICC > 0.99). ILT appeared homogenous on CTA, whereas MRI revealed compositional variations. Patients with AAAs ≥5.5 cm and
ISSN:0938-7994
1432-1084
DOI:10.1007/s00330-016-4559-0