Clinical Evaluation of Single-Shot and Readout-Segmented Diffusion-Weighted Imaging in Stroke Patients at 3 T

Morelli, John N.; Porter, David A.; Ai, Fen; Gerdes, Clint M.; Saettele, Megan R.; Feiweier, Thorsten; Padua, Abraham; Dix, James E.; Marra, Michael J.; Rangaswamy, Rajesh; Runge, Val M.

doi:10.1258/ar.2012.120541

Cited by 44 publications

(40 citation statements)

References 18 publications

(30 reference statements)

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“…Regarding the qualitative assessment, rs-EPI was found to be superior to ss-EPI in overall image quality, anatomical structure distinction, and conspicuity of the lesions. It is consistent with previously published studies (8, 14, 15, 16). In a recent study investigating the diagnostic value of rs-EPI in 47 patients of breast lesions, rs-EPI provided higher image quality and lesion conspicuity compared to ss-EPI (14).…”

Section: Discussionsupporting

confidence: 94%

“…Our results are consistent with those of Morelli et al (16), who compared ss-EPI and rs-EPI in the brain MRI. However, SNR in rs-EPI was lower than that in ss-EPI in the other studies (8, 14).…”

Section: Discussionsupporting

confidence: 93%

“…The rs-EPI sequence provides a significantly higher overall quality by reducing spatial distortion and image blurring. Previous studies compared the distortions in the two DW images sequences either qualitatively or quantitatively and demonstrated the reduced distortion in rs-EPI (8, 14, 15, 16). In a study of DW in stroke patients, the distortion was evaluated by measuring the AP length of the pons (16).…”

Section: Discussionmentioning

confidence: 99%

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Readout-Segmented Echo-Planar Imaging in Diffusion-Weighted MR Imaging in Breast Cancer: Comparison with Single-Shot Echo-Planar Imaging in Image Quality

Kim

Kang

et al. 2014

Korean J Radiol

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ObjectiveThe purpose of this study was to compare the image quality of standard single-shot echo-planar imaging (ss-EPI) and that of readout-segmented EPI (rs-EPI) in patients with breast cancer.Materials and MethodsSeventy-one patients with 74 breast cancers underwent both ss-EPI and rs-EPI. For qualitative comparison of image quality, three readers independently assessed the two sets of diffusion-weighted (DW) images. To evaluate geometric distortion, a comparison was made between lesion lengths derived from contrast enhanced MR (CE-MR) images and those obtained from the corresponding DW images. For assessment of image parameters, signal-to-noise ratio (SNR), lesion contrast, and contrast-to-noise ratio (CNR) were calculated.ResultsThe rs-EPI was superior to ss-EPI in most criteria regarding the qualitative image quality. Anatomical structure distinction, delineation of the lesion, ghosting artifact, and overall image quality were significantly better in rs-EPI. Regarding the geometric distortion, lesion length on ss-EPI was significantly different from that of CE-MR, whereas there were no significant differences between CE-MR and rs-EPI. The rs-EPI was superior to ss-EPI in SNR and CNR.ConclusionReadout-segmented EPI is superior to ss-EPI in the aspect of image quality in DW MR imaging of the breast.

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Section: Discussionsupporting

confidence: 94%

Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

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Readout-Segmented Echo-Planar Imaging in Diffusion-Weighted MR Imaging in Breast Cancer: Comparison with Single-Shot Echo-Planar Imaging in Image Quality

Kim

Kang

et al. 2014

Korean J Radiol

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“…This suggested that although the SNRs of the rs-EPI images were decreased, they exhibited less severe susceptibility artifacts and distortion, resulting in improved visualization of the target lesions. Morelli, 11 Holdsworth, 12 and Naganawa and associates 13 reported the acquisition of high resolution diffusion images and improved visualization of the brainstem and cranial nerves during studies of the head in patients with stroke. Whereas Naganawa's group set the voxel size on rs-EPI at 0.5 © 0.6 © 4 mm, we set it at 1.0 © 1.0 © 1.5 mm, which reduced the slice thickness, during imaging using a matrix size of 226 © 226 because the target lesions were cholesteatomas.…”

Section: Discussionmentioning

confidence: 99%

Optimal Imaging Parameters for Readout-segmented EPI of the Temporal Bone

et al. 2015

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Readout-segmented echo planar imaging (rs-EPI) is a form of multi-shot EPI. rs-EPI is affected less by susceptibility artifacts than single-shot EPI (ss-EPI), which is widely used for diffusion-weighted imaging, so rs-EPI is expected to produce less image distortion. In this study, we compared rs-EPI and conventional ss-EPI of the temporal bone region, which contains abundant amounts of air and frequently exhibits changes in magnetic susceptibility. In addition, we used a phantom to determine the optimum rs-EPI acquisition conditions for clinical use and investigated the clinical utility of rs-EPI in 20 patients (8 men, 12 women, mean age, 54.3 « 16.7-years-old) with cholesteatoma (mean apparent diffusion coefficient on ss-EPI, 0.88 © 10 ¹3 « 0.18 mm 2 /s). The images of the temporal bone region produced using rs-EPI exhibited less distortion than those obtained with ss-EPI (P < 0.05).

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“…For instance, Porter and Heidemann 19 implemented a readout-segmented EPI with parallel imaging, which combined reduced susceptibility artifact with superior motion correction while only marginally increasing the scan time. 20 …”

Section: Magnetization Transfer Contrastmentioning

confidence: 99%