Abstract:
BACKGROUND:Single-shot fast spin echo (SSFSE) is particularly appealing in pediatric patients because of its motion robustness. However radiofrequency energy deposition at 3 tesla forces long pauses between slices, leading to longer scans, longer breath-holds and more between-slice motion. OBJECTIVE:We sought to learn whether modulation of the SSFSE refocusing flip-angle train could reduce radiofrequency energy deposition without degrading image quality, thereby reducing inter-slice pauses and overall scan times. MATERIALS AND METHODS:We modulated the refocusing flip-angle train for SSFSE to minimize energy deposition while minimizing blurring and motion-related signal loss. In a cohort of 50 consecutive patients (25 boys, mean age 5.5 years, range 1 month to 17 years) referred for abdominal MRI we obtained standard SSFSE and variable refocusing flip-angle (vrfSSFSE) images and recorded sequence scan times. Two readers independently scored the images in blinded, randomized order for noise, tissue contrast, sharpness, artifacts and left lobe hepatic signal uniformity on a four-point scale. The null hypothesis of no difference between SSFSE and vrfSSFSE image-quality was assessed with a Mann-Whitney U test, and the null hypothesis of no scan time difference was assessed with the paired t-test. RESULTS:SSFSE and vrfSSFSE mean acquisition times were 54.3 and 26.2 s, respectively (P-value <0.0001). For each reader, SSFSE and vrfSSFSE noise, tissue contrast, sharpness and artifacts were not significantly different (P-values 0.18-0.86). However, SSFSE had better left lobe hepatic signal uniformity (P < 0.01, both readers). CONCLUSION:vrfSSFSE is twice as fast as SSFSE, with equivalent image quality with the exception of left hepatic lobe signal heterogeneity.
journal_name
Pediatr Radioljournal_title
Pediatric radiologyauthors
Ruangwattanapaisarn N,Loening AM,Saranathan M,Litwiller DV,Vasanawala SSdoi
10.1007/s00247-014-3227-2subject
Has Abstractpub_date
2015-06-01 00:00:00pages
847-54issue
6eissn
0301-0449issn
1432-1998journal_volume
45pub_type
杂志文章abstract::Two patients with aneurysmal bone cysts of the spine demonstrate striking similarities when examined with magnetic resonance imaging (MRI), while the plain radiographs and images on computed tomography (CT) are quite different. Gadolinium DTPA enhanced T1W images were especially helpful in the definition of the lesion...
journal_title:Pediatric radiology
pub_type: 杂志文章
doi:10.1007/BF02015620
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abstract::Primary non-Hodgkin's lymphoma of the skull base presenting with neuro-ophthalmologic abnormalities or cavernous sinus involvement is very rare in children. We have found only 13 reported cases of cavernous sinus involvement by lymphoma [1]. We report the case of the youngest child diagnosed with Burkitt's lymphoma of...
journal_title:Pediatric radiology
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journal_title:Pediatric radiology
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journal_title:Pediatric radiology
pub_type: 杂志文章
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journal_title:Pediatric radiology
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journal_title:Pediatric radiology
pub_type: 杂志文章
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abstract:BACKGROUND:Laterality defects are quite common in thoracoileopagus and parapagus dicephalus but rare in other types of conjoined twins. OBJECTIVE:To present the presumed laterality defects in cephalothoracoileopagus and prosopothoracoileopagus conjoined twins, based on the unilateral or bilateral absence or duplicatio...
journal_title:Pediatric radiology
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journal_title:Pediatric radiology
pub_type: 杂志文章
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journal_title:Pediatric radiology
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abstract:BACKGROUND:In contrast to adults, intraparenchymal haemorrhage (IPH) is at least as common as ischaemic stroke in children. There is often uncertainty about the most appropriate modality for imaging in the acute stage. OBJECTIVE:To examine the diagnostic value of MRI and MR angiography (MRA) in the detection of underl...
journal_title:Pediatric radiology
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journal_title:Pediatric radiology
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journal_title:Pediatric radiology
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journal_title:Pediatric radiology
pub_type: 杂志文章
doi:10.1007/s002470050464
更新日期:1998-10-01 00:00:00
abstract:: ...
journal_title:Pediatric radiology
pub_type: 评论,杂志文章
doi:10.1007/s00247-018-4248-z
更新日期:2018-11-01 00:00:00
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journal_title:Pediatric radiology
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journal_title:Pediatric radiology
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journal_title:Pediatric radiology
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journal_title:Pediatric radiology
pub_type: 杂志文章
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更新日期:1981-01-01 00:00:00
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journal_title:Pediatric radiology
pub_type: 杂志文章
doi:10.1007/s00247-009-1386-3
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abstract::In recent years as a result of decreasing prices and the increasing availability of portable systems, ultrasonography (US), which historically has primarily been the domain of radiologists, has become more widely available to non-radiologists as well. This has increased the use of point-of-care paediatric US performed...
journal_title:Pediatric radiology
pub_type: 杂志文章,评审
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journal_title:Pediatric radiology
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更新日期:2011-06-01 00:00:00
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journal_title:Pediatric radiology
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journal_title:Pediatric radiology
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