Impact of readout-segmented echo-planar imaging based on small field of view and saturation band on image quality of orbital diffusion weighted imaging
10.13929/j.issn.1003-3289.2023.12.029
- VernacularTitle:基于小视野及饱和带分段读出平面回波成像对眼眶弥散加权成像图像质量的影响
- Author:
Hai SHI
1
;
Jiulou ZHANG
;
Jianwei WANG
;
Feifei QU
;
Hao HU
;
Lulu XU
Author Information
1. 南京医科大学第一附属医院放射科,江苏南京 210029
- Keywords:
orbit;
magnetic resonance imaging;
prospective studies;
image quality
- From:
Chinese Journal of Medical Imaging Technology
2023;39(12):1872-1876
- CountryChina
- Language:Chinese
-
Abstract:
Objective To observe the impact of readout-segmented echo-planar imaging(RS-EPI)based on small field of view(FOV)and saturation band on image quality of orbital diffusion weighted imaging(DWI).Methods Orbital MR scanning were prospectively performed in 33 healthy subjects.T1W,RS-RPI and optimized RS-EPI(based on small FOV and saturation band)images were acquired.Imaging quality of RS-EPI and optimized RS-EPI on displaying intraorbital structures(eyeballs,optic nerve and intraconal compartment)and periorbital structures(nasal cavity,orbital gyrus,optic chiasma,pituitary and temporal lobe)were evaluated subjectively using 5-point method.The geometric parameters of eyeball,signal-to-noise ratio(SNR)and apparent diffusion coefficient(ADC)were compared between images of RS-EPI and optimized RS-EPI.Results The display of eyeball,nasal cavity,orbital gyrus,optic chiasm,pituitary and temporal lobe on optimized RS-EPI were all better than those on RS-EPI(all P＜0.01),whereas no significant difference of optic nerve nor intraconal compartment was found between optimized RS-EPI and RS-EPI images(P＞0.05).Deformations of eyeball volume,sphericity,surface area,3D maximum diameter,axial maximum diameter and sagittal maximum diameter of bilateral eyes on optimized RS-EPI images were all slighter than those on RS-EPI(all P＜0.01),whereas no significant difference of deformations of coronal maximum diameters was found between optimized RS-EPI and RS-EPI images(P＞0.05).SNR of left temporal lobe white matter and ADC of vitreous body on optimized RS-EPI images were both lower than those on RS-EPI(both P＜0.01),whereas no significant difference of ADC of left temporal lobe white matter nor that of pons was found between optimized RS-EPI and RS-EPI images(P＞0.05).Conclusion Optimized RS-EPI with small FOV and saturation band could be used to improve imaging quality of orbital DWI.
