Volumetric fat-water separated T2-weighted MRI
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Shreyas S. Vasanawala & Ananth J. Madhuranthakam & Ramesh Venkatesan & Arvind Sonik & Peng Lai & Anja C. S. Brau
- چاپ و سال / کشور: 2010
Description
Background Pediatric body MRI exams often cover multiple body parts, making the development of broadly applicable protocols and obtaining uniform fat suppression a challenge. Volumetric T2 imaging with Dixon-type fatwater separation might address this challenge, but it is a lengthy process. Objective We develop and evaluate a faster two-echo approach to volumetric T2 imaging with fat-water separation. Materials and methods A volumetric spin-echo sequence was modified to include a second shifted echo so two image sets are acquired. A region-growing reconstruction approach was developed to decompose separate water and fat images. Twenty-six children were recruited with IRB approval and informed consent. Fat-suppression quality was graded by two pediatric radiologists and compared against conventional fat-suppressed fast spinecho T2-W images. Additionally, the value of in- and opposed-phase images was evaluated. Results Fat suppression on volumetric images had high quality in 96% of cases (95% confidence interval of 80– 100%) and were preferred over or considered equivalent to conventional two-dimensional fat-suppressed FSE T2 imaging in 96% of cases (95% confidence interval of 78– 100%). In- and opposed-phase images had definite value in 12% of cases. Conclusion Volumetric fat-water separated T2-weighted MRI is feasible and is likely to yield improved fat suppression over conventional fat-suppressed T2-weighted imaging
Pediatr Radiol (2011) 41:875–883 DOI 10.1007/s00247-010-1963-5 Received: 8 September 2010 / Revised: 22 November 2010 / Accepted: 1 December 2010 / Published online: 18 January 2011
