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

Azuma, Toshiya; Kodama, Takahide; Yokota, Takanori; Enzaki, Masahiro; Nakamura, Masato; Murata, Katsutoshi

doi:10.2463/mrms.2014-0047

Cited by 9 publications

(6 citation statements)

References 13 publications

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“…11 So far, only a few studies have evaluated this new approach and found promising results. [17][18][19] This study evaluated RESOLVE-DWI for the detection of cholesteatoma and compared the results with surgical validation. Pooled sensitivity of non-EPI DWI for the detection of residual and recurrent cholesteatomas in a recent meta-analysis was 91% with a specificity of 92%.…”

Section: Discussionmentioning

confidence: 99%

Readout-Segmented Echo-Planar DWI for the Detection of Cholesteatomas: Correlation with Surgical Validation

Fischer¹,

Schartinger²,

Dejaco³

et al. 2019

AJNR Am J Neuroradiol

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BACKGROUND AND PURPOSE: MR imaging has become an important tool for the detection of cholesteatomas of the middle ear. Various diffusion-weighted imaging sequences are available and have shown promising results. This study aimed to evaluate readoutsegmented echo-planar DWI for the detection of cholesteatoma and compare the results with surgical validation. MATERIALS AND METHODS: Fifty patients with chronic otitis media (24 females and 26 males; range, 12-76 years of age; mean age, 41 years) who underwent MR imaging before an operation of the middle ear (1-169 days) were included. The MR imaging protocol consisted of axial and coronal readout-segmented echo-planar DWI with b-values of 0 and 1000 s/mm 2 and 3-mm slice thickness. The readoutsegmented echo-planar diffusion-weighted images were fused with standard T2-weighted sequences for better anatomic assignment. The results of the MR imaging evaluation were correlated with the results from the operation. RESULTS: Readout-segmented echo-planar DWI detected 22 of the 25 cases of surgically proved cholesteatoma. It has an accuracy of 92% (95% confidence interval, 80.8%-97.8%), a sensitivity of 88%, a specificity of 96%, a positive predictive value of 96%, and a negative predictive value of 89%. In 1 case, a positive finding for cholesteatoma with readout-segmented echo-planar DWI could not be proved by histology, and in 3 cases, histology yielded a cholesteatoma that was not detected with MR imaging. CONCLUSIONS: Readout-segmented echo-planar DWI is a promising and reliable MR imaging sequence for the detection and exclusion of cholesteatoma.

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Section: Discussionmentioning

confidence: 99%

Readout-Segmented Echo-Planar DWI for the Detection of Cholesteatomas: Correlation with Surgical Validation

Fischer¹,

Schartinger²,

Dejaco³

et al. 2019

AJNR Am J Neuroradiol

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“…An alternative, recently introduced technique, which divides the k- space trajectory into multiple segments in the readout direction, limits susceptibility artifacts and geometric distortion. 15–17 This so-called readout-segmented echo-planar DTI (rs-DTI) sequence uses multiple excitations followed by short echo-trains for the sampling of the tissue diffusion data, part by part, to then combine it to a final image. 15 Due to briefer echo-trains and shorter echo-spacing, in comparison to conventional ss-DTI sequences, rs-DTI is capable of achieving a higher image resolution, an increased signal-to-noise-ratio (SNR) and a reduction of susceptibility-based artifacts.…”

Section: Introductionmentioning

confidence: 99%

Diffusion Tensor Imaging of the Brachial Plexus: A Comparison between Readout-segmented and Conventional Single-shot Echo-planar Imaging

Ciritsis

Manoliu

et al. 2019

MRMS

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Purpose: Diffusion tensor imaging (DTI) adds functional information to morphological magnetic resonance neurography (MRN) in the assessment of the brachial nerve plexus. To determine the most appropriate pulse sequence in scan times suited for diagnostic imaging in clinical routine, we compared image quality between simultaneous multi-slice readout-segmented (rs-DTI) and conventional single-shot (ss-DTI) echo-planar imaging techniques. Methods: Institutional Review Board (IRB) approved study including 10 healthy volunteers. The supraclavicular brachial plexus, covering the nerve roots and trunks from C5 to C7, was imaged on both sides with rs-DTI and ss-DTI. Both sequences were acquired in scan times <7 min with b -values of 900 s/mm 2 and with isotropic spatial resolution. Results: In rs-DTI image, the overall quality was significantly better and distortion artifacts were significantly lower ( P = 0.001–0.002 and P = 0.001–0.002, respectively) for both readers. In ss-DTI, a trend toward lower degree of ghosting and motion artifacts was elicited (reader 1, P = 0.121; reader 2, P = 0.264). No significant differences between the two DTI techniques were found for signal-to-noise ratios (SNR), contrast-to-noise ratios (CNR) and fractional anisotropy (FA) ( P ≥ 0.475, P ≥ 0.624, and P ≥ 0.169, respectively). Interreader agreement for all examined parameters and all sequences ranged from intraclass correlation coefficient (ICC) 0.064 to 0.905 and Kappa 0.40 to 0.851. Conclusion: Incomparable acquisition times rs-DTI showed higher image quality and less distortion artifacts than ss-DTI. The trend toward a higher degree of ghosting and motion artifacts in rs-DTI did not deteriorate image quality to a significant degree. Thus, rs-DTI should be considered for functional MRN of the brachial plexus.

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“…3,4,[14][15][16] An alternative technique is to divide the k-space trajectory into multiple segments along the readout direction (rs-DTI). [17][18][19] This requires multiple excitations followed by shorter echo trains, each of which only samples part of the raw data for a single image. The segmentation results in shorter minimum echo times, increasing the signal-to-noise ratio (SNR), and significantly reduces the severity of susceptibilityrelated artifacts.…”

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confidence: 99%