Abstract
Objective
The study compared the use of periodically rotated overlapping parallel lines with
enhanced reconstruction (PROPELLER) technique fast spin echo (FSE) T2 W and the sequence
of three-dimensional fast imaging employing steady-state acquisition (3D–FIESTA) technique
in the MRI of the internal auditory canal for overall image quality improvement.
Materials and methods
One hundred thirty-two patients undergoing FSE T2 W PROPELLER and 3D–FIESTA examinations
of the internal auditory canal were included. All examinations were performed at 3.0
T with comparison of a sagittal oblique FSE T2 W sequence with the PROPELLER technique
to 3D–FIESTA in the same reconstructed orientation with PROPELLER. Image quality was
evaluated by two radiologists using a 4-point scale. The Wilcoxon signed rank test
was used to compare the data of the two techniques.
Results
The image quality of FSE T2 W PROPELLER was significantly improved compared to the
reconstructed images of 3D–FIESTA. Observer 1: median FSE T2 W with PROPELLER, 4 [mean,
3.455] versus median reconstructed 3D–FIESTA, 3 [mean, 3.15], (P<.001); Observer 2: median FSE T2 W with PROPELLER, 4 [mean, 3.47] versus median reconstructed
3D–FIESTA, 3 [mean, 3.25], (P<.001). Interobserver agreement was good (k value, 0.73) for the rating of the overall
image quality.
Conclusion
The FSE T2 W PROPELLER technique for MRI of internal auditory canal reduced uncertainty
caused by motion artifact and improved the quality of the image compared to the reconstructed
3D–FIESTA. It was affected by different parameters including the blade width, echo
train length (ETL). This is explained by data oversampling at the center region of
k-space, which requires additional imaging time over conventional MRI techniques.
Increasing blade was expected to improve motion correction effects but also the signal-to-noise
ratio. ETL increases the image sharpness and the overall image quality.
Keywords
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Article info
Publication history
Published online: October 04, 2016
Accepted:
September 8,
2016
Received in revised form:
July 12,
2016
Received:
December 15,
2015
Identification
Copyright
© 2016 Published by Elsevier Inc.
