3D morphometry using automated aortic segmentation in native MR angiography: an alternative to contrast enhanced MRA?

Müller-Eschner, Matthias; Müller, Tobias; Biesdorf, Andreas; Wörz, Stefan; Rengier, Fabian; Böckler, Dittmar; Kauczor, Hans-Ulrich; Rohr, Karl; von Tengg-Kobligk, Hendrik (2014). 3D morphometry using automated aortic segmentation in native MR angiography: an alternative to contrast enhanced MRA? Cardiovascular diagnosis and therapy, 4(2), pp. 80-87. AME Publishing Company 10.3978/j.issn.2223-3652.2013.10.06

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INTRODUCTION Native-MR angiography (N-MRA) is considered an imaging alternative to contrast enhanced MR angiography (CE-MRA) for patients with renal insufficiency. Lower intraluminal contrast in N-MRA often leads to failure of the segmentation process in commercial algorithms. This study introduces an in-house 3D model-based segmentation approach used to compare both sequences by automatic 3D lumen segmentation, allowing for evaluation of differences of aortic lumen diameters as well as differences in length comparing both acquisition techniques at every possible location. METHODS AND MATERIALS Sixteen healthy volunteers underwent 1.5-T-MR Angiography (MRA). For each volunteer, two different MR sequences were performed, CE-MRA: gradient echo Turbo FLASH sequence and N-MRA: respiratory-and-cardiac-gated, T2-weighted 3D SSFP. Datasets were segmented using a 3D model-based ellipse-fitting approach with a single seed point placed manually above the celiac trunk. The segmented volumes were manually cropped from left subclavian artery to celiac trunk to avoid error due to side branches. Diameters, volumes and centerline length were computed for intraindividual comparison. For statistical analysis the Wilcoxon-Signed-Ranked-Test was used. RESULTS Average centerline length obtained based on N-MRA was 239.0±23.4 mm compared to 238.6±23.5 mm for CE-MRA without significant difference (P=0.877). Average maximum diameter obtained based on N-MRA was 25.7±3.3 mm compared to 24.1±3.2 mm for CE-MRA (P<0.001). In agreement with the difference in diameters, volumes obtained based on N-MRA (100.1±35.4 cm(3)) were consistently and significantly larger compared to CE-MRA (89.2±30.0 cm(3)) (P<0.001). CONCLUSIONS 3D morphometry shows highly similar centerline lengths for N-MRA and CE-MRA, but systematically higher diameters and volumes for N-MRA.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Radiology, Neuroradiology and Nuclear Medicine (DRNN) > Institute of Diagnostic, Interventional and Paediatric Radiology

UniBE Contributor:

von Tengg-Kobligk, Hendrik

Subjects:

600 Technology > 610 Medicine & health

ISSN:

2223-3652

Publisher:

AME Publishing Company

Language:

English

Submitter:

Aisha Stefania Mzinga

Date Deposited:

04 May 2015 09:55

Last Modified:

04 May 2015 09:55

Publisher DOI:

10.3978/j.issn.2223-3652.2013.10.06

PubMed ID:

24834406

Uncontrolled Keywords:

Magnetic resonance angiography; aorta; automatic data processing; thoracic

BORIS DOI:

10.7892/boris.66784

URI:

https://boris.unibe.ch/id/eprint/66784

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