Automatic Abdominal Aortic Aneurysm segmentation in MR images

Abdominal Aortic Aneurism is a disease related to a weakening in the aortic wall that can cause a break in the aorta and the death. The detection of an unusual dilatation of a section of the aorta is an indicative of this disease. However, it is difficult to diagnose because it is necessary image diagnosis using computed tomography or magnetic resonance. An automatic diagnosis system would allow to analyze abdominal magnetic resonance images and to warn doctors if any anomaly is detected. We focus our research in magnetic resonance images because of the absence of ionizing radiation. Although there are proposals to identify this disease in magnetic resonance images, they need an intervention from clinicians to be precise and some of them are computationally hard. In this paper we develop a novel approach to analyze magnetic resonance abdominal images and detect the lumen and the aortic wall. The method combines different algorithms in two stages to improve the detection and the segmentation so it can be applied to similar problems with other type of images or structures. In a first stage, we use a spatial fuzzy C-means algorithm with morphological image analysis to detect and segment the lumen; and subsequently, in a second stage, we apply a graph cut algorithm to segment the aortic wall. The obtained results in the analyzed images are pretty successful obtaining an average of 79% of overlapping between the automatic segmentation provided by our method and the aortic wall identified by a medical specialist. The main impact of the proposed method is that it works in a completely automatic way with a low computational cost, which is of great significance for any expert and intelligent system.

MR Anfórico (MR-A) 09/05/2016

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Terms of partnership with Mr. S. Cheney, 1797 August 28

Two leaves containing a handwritten agreement between Samuel Cheney and William Croswell as partners in school-keeping.

Letter from William Croswell to [Mr. Turner], 1808 June 14

Draft of a letter with information about Croswell's activities.

Letter from William Croswell to Mr. Norton, 1820 August 14

Handwritten copy of a brief note from Croswell requesting he be allowed to continue to keep borrowed library books.

Letter from William Croswell to the Mr. Holt, 1824 May 10

Draft of a letter complaining about the noisiness of Holt's students.

Letter from William Croswell to Mr. Sparks, 1824 September 10

Draft of a letter requesting employment with the North American Review.

Letter from William Croswell to the Mr. Holt, [1824] September 30

Draft of a letter complaining about the noisiness of Holt's students.

Letter from William Croswell to Mr. B, [ca. 1829]

Draft of a letter regarding Croswell's study of the New Testament.

Agreements with Mr. Davies respecting Tables of Longitude, 1790 October 2

This folder contains two handwritten agreements concerning the exchange of mathematical calculations by Nathan Davies for copies of Croswell's published tables of longitude.

Subscription for the benefit of Mr. William Croswell, 1811

Two handwritten copies of a request to subscribers for monetary aid to Croswell on the credit of the future sales of his published map.

Mr. Gannett's Acct. for Commencement Dinner, 1781 July

Handwritten itemized list of costs for food and supplies purchased for the 1781 Commencement dinner. Signed by Caleb Gannett.

Mr. [Levi] Colburn's estimate, 14 April 1813

In this letter from Levi Colburn to Loammi Baldwin, Colburn details the cost estimates in dollars for the roof, floors, windows, and labor of University Hall.