Abstract/Details

Low-contrast lesion detection in tomosynthetic breast imaging


2007 2007

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Abstract (summary)

Conventional 2D mammography is currently the most effective approach to detecting early stage breast cancer. Tomosynthetic breast imaging is a potentially more valuable 3D technique for breast cancer detection. This technique acquires a limited number of noisy 2D projection images over a limited angular range and then mathematically reconstructs a 3D breast. In breast imaging, the contrast between cancerous lesions and background features is fairly small; furthermore, the presence of lesions is masked by normal anatomical structures. The low contrast, anatomical masking and effects of radiation noise all combine to make lesion detection a difficult task.

In this simulation study, we investigate the efficacy of three tomosynthetic reconstruction algorithms simple backprojection, algebraic, and statistical in the context of an especially difficult lesion detection task. This is the detection of a very low-contrast mass embedded in a very dense bro-glandular tissue background a clinically useful task for which tomosynthesis may be well suited. The project uses anatomically realistic 3D breast phantoms whose normal anatomic variability limits lesion conspicuity. In order to capture anatomical object variability, we generate an ensemble of 3D breast phantoms by using stochastic algorithms, each of which results in random instances of various breast structures. Power-law structural noise is added to simulate small-scale object variability. The irregular mass is simulated by a 3D random walk algorithm. Low-dose data are acquired using an isocentric geometry and simulated Poisson radiation noise is added. The data are then reconstructed via the three types of methods. Reconstructed slices through the center of the lesion are presented to human observers in a two-alternative-forced-choice test to measure lesion detectability by computing the area under the ROC curve. We conclude that backprojection algorithms perform significantly more poorly compared to the other two types of reconstruction methods.

Indexing (details)


Subject
Electrical engineering
Classification
0544: Electrical engineering
Identifier / keyword
Applied sciences; 2AFC human observer study; Breast tomosynthesis; Lesion detection; Reconstruction algorithm; System optimization; Three-dimensional breast phantom
Title
Low-contrast lesion detection in tomosynthetic breast imaging
Author
Zhou, Lili
Number of pages
167
Publication year
2007
Degree date
2007
School code
0771
Source
DAI-B 69/02, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780549475125
University/institution
State University of New York at Stony Brook
University location
United States -- New York
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3302050
ProQuest document ID
304748937
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304748937
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