Authors
Morrin, Martina MPedrosa, Ivan
McKenzie, Charles A
Farrell, Richard J
Bloch, Nicolas
Solazzo, Stephanie
Ngo, Long
Goldberg, Shraga N
Rofsky, Neil M
Affiliation
Department of Radiology, Beaumont Hospital, Dublin, Ireland. mmorrin@rcsi.ieIssue Date
2008-09MeSH
AlgorithmsAnimals
Colon
Colonic Polyps
Image Enhancement
Image Interpretation, Computer-Assisted
Imaging, Three-Dimensional
Magnetic Resonance Imaging
Pattern Recognition, Automated
Phantoms, Imaging
Reproducibility of Results
Sensitivity and Specificity
Subtraction Technique
Swine
Metadata
Show full item recordCitation
Parallel imaging enhanced MR colonography using a phantom model. 2008, 28 (3):664-72 J Magn Reson ImagingJournal
Journal of magnetic resonance imaging : JMRIDOI
10.1002/jmri.21357PubMed ID
18777549Additional Links
http://www.ncbi.nlm.nih.gov/pubmed/18777549Abstract
To compare various Array Spatial and Sensitivity Encoding Technique (ASSET)-enhanced T2W SSFSE (single shot fast spin echo) and T1-weighted (T1W) 3D SPGR (spoiled gradient recalled echo) sequences for polyp detection and image quality at MR colonography (MRC) in a phantom model. Limitations of MRC using standard 3D SPGR T1W imaging include the long breath-hold required to cover the entire colon within one acquisition and the relatively low spatial resolution due to the long acquisition time. Parallel imaging using ASSET-enhanced T2W SSFSE and 3D T1W SPGR imaging results in much shorter imaging times, which allows for increased spatial resolution.Using two porcine colon phantoms each with eight simulated 3-10-mm "polyps," baseline reference sequences acquired without ASSET (6-mm slices and readout bandwidth [BW] 62 kHz) were compared with 11 SSFSE and 8 SPGR sequences acquired with 2-fold ASSET acceleration. ASSET-enhanced SSFSE and SPGR sequences comprised BW/matrix combinations ranging from 20-62 kHz/256-352x256, respectively, with slice thicknesses adjusted from 3.0 to 4.5 mm to maintain a 23-26-second acquisition time and 30 cm slab thickness. Two experienced radiologists viewed the datasets in a randomized, blinded fashion.
Compared to reference sequences, ASSET-enhanced SSFSE and SPGR sequences facilitated better polyp detection and had similar overall image quality and per-phantom specificity. The two best ASSET-enhanced SSFSE (3 and 4.5 mm slices, each with BW of 62.5 kHz and 352x256 matrices) and three best ASSET-enhanced SPGR BW/slice thickness/matrix combinations of 31 kHz/4.4 msec/192x256; 62/3.4/192x256; and 62/4.0/192x256, respectively, permitted detection of all polyps>or=5 mm.
Parallel imaging using ASSET-enhanced T2W SSFSE and T1W 3D SPGR improves the ability to detect significant colon polyps in an MRC phantom model.
Item Type
ArticleLanguage
enISSN
1053-1807ae974a485f413a2113503eed53cd6c53
10.1002/jmri.21357
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