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01-12-2014 | Head and Neck

The clinical utility of reduced-distortion readout-segmented echo-planar imaging in the head and neck region: initial experience

Authors: Sho Koyasu, Mami Iima, Shigeaki Umeoka, Nobuko Morisawa, David A. Porter, Juichi Ito, Denis Le Bihan, Kaori Togashi

Published in: European Radiology | Issue 12/2014

Abstract

Objectives

To evaluate whether readout-segmented echo-planar imaging (RS-EPI) diffusion weighted image (DWI) can diminish image distortion in the head and neck area, compared with single-shot (SS)-EPI DWI.

Methods

We conducted phantom and patient studies using 3 T magnetic resonance imaging (MRI) with a 16-channel coil. For the phantom study, we evaluated distortion and signal homogeneity in gel phantoms. For the patient study, 29 consecutive patients with clinically suspicious parotid lesions were prospectively enrolled. RS-EPI and SS-EPI DWI were evaluated by two independent readers for identification of organ/lesion and distortion, using semiquantitative scales and quantitative scores. Apparent diffusion coefficient (ADC) values and contrast-noise ratios of parotid tumours (if present; n = 15) were also compared.

Results

The phantom experiments showed that RS-EPI provided less distorted and more homogeneous ADC maps than SS-EPI. In the patient study, RS-EPI was found to provide significantly less distortion in almost all organs/lesions (p < 0.05), according to both semiquantitative scales and quantitative scores. There was no significant difference in ADC values and contrast-noise ratios between the two DWI techniques.

Conclusions

The distortion in DWI was significantly reduced with RS-EPI in both phantom and patient studies. The RS-EPI technique provided more homogenous images than SS-EPI, and can potentially offer higher image quality in the head and neck area.

Key Points

• The distortion in DWI is significantly reduced with RS-EPI compared with SS-EPI.

• Structures in the head and neck were identified more clearly using RS-EPI.

• No significant difference in ADC values was found between the techniques.

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Title: The clinical utility of reduced-distortion readout-segmented echo-planar imaging in the head and neck region: initial experience
Authors: Sho Koyasu
Mami Iima
Shigeaki Umeoka
Nobuko Morisawa
David A. Porter
Juichi Ito
Denis Le Bihan
Kaori Togashi
Publication date: 01-12-2014
Publisher: Springer Berlin Heidelberg
Published in: European Radiology / Issue 12/2014
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-014-3369-5

Keynote webinar | Spotlight on medication adherence

Springer Medicine

The clinical utility of reduced-distortion readout-segmented echo-planar imaging in the head and neck region: initial experience

Abstract

Objectives

Methods

Results

Conclusions

Key Points

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Objectives

Methods

Results

Conclusions

Key Points

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