Readout-segmented Echo-planar Imaging for Diffusion-weighted Imaging in the Pelvis at 3T—A Feasibility Study

Thian, Yee Liang; Xie, Wenhui; Porter, David A.; Ang, Bertrand Weileng

doi:10.1016/j.acra.2014.01.005

Cited by 46 publications

(38 citation statements)

References 28 publications

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“…However, for MS-DWI-iPAT, the higher SNR standard deviation revealed clearly higher SNR inhomogeneity. These findings are consistent with the earlier study by Thian et al [23], and we tend to conclude that MS-DWI offers significant advantages in image quality, less artifact and higher geometric fidelity.…”

Section: Discussionsupporting

confidence: 94%

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Segmented diffusion-weighted imaging of the prostate: Application to transperineal in-bore 3T MR image-guided targeted biopsy

Fedorov

Tuncalı

Panych

et al. 2016

Magnetic Resonance Imaging

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Objective-To evaluate the applicability of using single-shot and multi-shot segmented diffusion-weighted imaging (DWI) techniques to support biopsy target localization in a cohort of targeted MRI-guided prostate biopsy patients.Materials and Methods-Single-shot echo-planar diffusion-weighted imaging (SS-DWI) and multi-shot segmented (MS-DWI) were performed intra-procedurally on a 3 Tesla system in a total of 35 men, who underwent in-bore prostate biopsy inside the scanner bore. Comparisons between SS-DWI and MS-DWI were performed with (in 16 men) and without (in 19 men) parallel coil acceleration (iPAT) for SS-DWI. Overall image quality and artifacts were scored by a radiologist and scores were compared with the Wilcoxon Mann-Whitney rank test. Correlation between the presence of air and image quality scores was evaluated with Spearman statistics. To quantify distortion, the anteroposterior prostate dimension was measured in SS and MS b=0 diffusion-and T 2 -weighted images. Signal-to-noise ratio was estimated in a phantom experiment. Agreement and accuracy of targeting based on retrospective localization of restricted diffusion areas in DWI was evaluated with respect to the targets identified using multiparametric MRI (mpMRI).Results-Compared to SS-DWI without iPAT, the average image quality score in MS-DWI improved from 2.0 to 3.3 (p<0.005) and the artifact score improved from 2.3 to 1.4 (p<0.005). When iPAT was used in SS-DWI, the average image quality score in MS-DWI improved from 2.6 to 3.3 (p<0.05) and the artifact score improved from 2.1 to 1.4 (p<0.01). Image quality (ρ=−0.74, p<0.0005) and artifact scores (ρ=0.77, p<0.0005) both showed strong correlation with the presence of air in the rectum for the SS-DWI sequence without iPAT. These correlations remained Publisher's Disclaimer: This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. HHS Public Access Author ManuscriptAuthor Manuscript Author ManuscriptAuthor Manuscript significant when iPAT was enabled (ρ=−0.52, p<0.05 and ρ=0.64, p<0.01). For the comparison MS-DWI vs SS-DWI without iPAT, median differences between diffusion-and T 2 -weighted image gland measurements were 1.1 (0.03-10.4) mm and 4.4 (0.5-22.7) mm, respectively. In the SS-DWI-iPAT cohort, median gland dimension differences were 2.7 (0.4-5.9) mm and 4.2 (0.7-8.9) mm, respectively. Out of the total of 89 targets identified in mpMRI, 20 had corresponding restricted diffusion areas in SS-DWI and 28 in MS-DWI. No statistically significant difference was observed between the distances for the targets in the target-concordant SS-and MS-DWI restricted diffusion areas (5.5 mm in SS-DWI...

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Section: Discussionsupporting

confidence: 94%

“…Recently, Thian et al [23] studied the feasibility and image quality of MS-DWI in the pelvis in a mixed cohort of male and female patients. However, we are not aware of a study focusing specifically on the imaging of the prostate and quantification of the distortion effects.…”

Section: Introductionmentioning

confidence: 99%

Segmented diffusion-weighted imaging of the prostate: Application to transperineal in-bore 3T MR image-guided targeted biopsy

Fedorov

Tuncalı

Panych

et al. 2016

Magnetic Resonance Imaging

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“…However, ss-EPI is highly prone to a susceptibility artifact and image blurring [7,8]. In prostate, distortion and other artifacts are particularly generated due to changes in magnetic susceptibility at the air-tissue boundary [9]. Thus, the diagnostic value of DWI based on ss-EPI can be diminished by these artifacts.…”

Section: Introductionmentioning

confidence: 98%

Comparison of field-of-view (FOV) optimized and constrained undistorted single shot (FOCUS) with conventional DWI for the evaluation of prostate cancer

et al. 2015

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“…[6] 일반적으로 DWI는 한 번의 고주파 펄스(radio fre quency pulse)와 많은 경사자장의 변화를 이용하여 k-공 간의 데이터를 획득하는 single-shot echo planar imaging 기법(이하 SS-EPI)을 사용한다. [7] 그러나 SS-EPI는 빠 른 시간 내 영상을 획득 할 수 있는 장점이 있으나, 위 상부호화 방향의 픽셀 당 대역폭이 작기 때문에 자화 율 효과(susceptibility effect)에 민감하다는 단점이 있다. 였다.…”

Section: ⅰ Introductionunclassified

The Study on Reduction of Image Distortion by using Single-Shot Turbo Spin Echo in Brain Stem Diffusion MRI

Choi¹,

Lee²,

Na³

et al. 2016

Journal of the Korean Society of Radiology

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Single-shot echo planar imaging(SS-EPI) is well established as high sensitivity for ischemic stroke. However, it is prone to susceptibility artifact in brain stem that diminish the image quality. single-shot turbo spin echo(SS-TSE) is a new DWI technique that can reduce susceptibility artifact. Thus, this research was conducted so as to reduce geometric distortion in brain stem by using single-shot turbo spin echo technique. Thirty patients without brain disease underwent diffusion MR on a 3T scanner with SS-EPI and SS-TSE. Obtained images with both sequences were analyzed for geometric distortion and error percentage as well. Image quality in terms of geometric distortion of SS-TSE were found to be significantly better than those for SS-EPI. And error percentage was considerably reduced for 2.4% of b0 image(from 11.1% to 8.7%), 1.2% of b1000 image(from 11.4% to 10.1%), respectively. In summary, diffusion MR using SS-TSE significantly reduce geometric distortion compared to SS-EPI in brain stem and may provide improved diagnostic performance.

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Readout-segmented Echo-planar Imaging for Diffusion-weighted Imaging in the Pelvis at 3T—A Feasibility Study

Cited by 46 publications

References 28 publications

Segmented diffusion-weighted imaging of the prostate: Application to transperineal in-bore 3T MR image-guided targeted biopsy

Segmented diffusion-weighted imaging of the prostate: Application to transperineal in-bore 3T MR image-guided targeted biopsy

Comparison of field-of-view (FOV) optimized and constrained undistorted single shot (FOCUS) with conventional DWI for the evaluation of prostate cancer

The Study on Reduction of Image Distortion by using Single-Shot Turbo Spin Echo in Brain Stem Diffusion MRI

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