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Computer-aided detection of colonic polyps using low-dose CT acquisitions.
- Source :
-
Academic radiology [Acad Radiol] 2006 Sep; Vol. 13 (9), pp. 1062-71. - Publication Year :
- 2006
-
Abstract
- Rationale and Objectives: This report proposes an alternative method for the automatic detection of colonic polyps that is robust enough to be directly applicable on low-dose computed tomographic data.<br />Materials and Methods: The polyp modeling process takes into account both the gray-level appearance of polyps (intensity profiles) and their geometry (extended Gaussian images). Spherical harmonic decompositions are used for comparison purposes, allowing fast estimation of the similarity between a candidate and a set of previously computed models. Starting from the original raw data (acquired at 55 mA), five patient data sets (prone and supine scans) are reconstructed at different dose levels (to 5 mA) by using different kernel filters, slice overlaps, and increments. Additionally, the efficacy of applying an edge-preserving smoothing filter before detection is assessed.<br />Results: Although image quality decreases when decreasing acquisition milliamperes, all polyps greater than 6 mm are detected successfully, even at 15 mA. Although not important at high doses, smoothing improves detection results for ultra-low-dose (tube current<15 mA) data.<br />Conclusion: The advantage of low-dose scans is a significant decrease in effective dose from 4.93 to 1.61 mSv while retaining high detection values, particularly important when thinking of population screening.
- Subjects :
- Humans
Information Storage and Retrieval methods
Radiation Dosage
Radiation Protection methods
Reproducibility of Results
Sensitivity and Specificity
Algorithms
Artificial Intelligence
Colonic Polyps diagnostic imaging
Pattern Recognition, Automated methods
Radiographic Image Enhancement methods
Radiographic Image Interpretation, Computer-Assisted methods
Tomography, X-Ray Computed methods
Subjects
Details
- Language :
- English
- ISSN :
- 1076-6332
- Volume :
- 13
- Issue :
- 9
- Database :
- MEDLINE
- Journal :
- Academic radiology
- Publication Type :
- Academic Journal
- Accession number :
- 16935718
- Full Text :
- https://doi.org/10.1016/j.acra.2006.05.002