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Author Spotlight: Optimized Lung MRI Protocol with Computationally Efficient Reconstruction Methods
Published on: September 6, 2024
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Comparison of lung imaging using three-dimensional ultrashort echo time and zero echo time sequences: preliminary
Kyungsoo Bae1,2, Kyung Nyeo Jeon3,4, Moon Jung Hwang5
1Department of Radiology, Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju, South Korea.
European Radiology
|December 15, 2018
Summary
High-resolution volumetric zero echo time (ZTE) magnetic resonance imaging (MRI) is feasible for routine lung scans. ZTE offers superior image quality and small nodule detection compared to ultrashort echo time (UTE) MRI, with significantly shorter scan times.
Area of Science:
- Radiology and Imaging Science
- Pulmonary Medicine
- Medical Physics
Background:
- Lung MRI traditionally faces challenges due to short T2/T2* relaxation times of lung tissues.
- Ultrashort echo time (UTE) sequences have been developed to address these challenges, but further improvements in image quality and efficiency are desirable.
- Zero echo time (ZTE) sequences represent an advancement in capturing signals from short T2/T2* tissues.
Purpose of the Study:
- To assess the feasibility of implementing high-resolution volumetric ZTE sequences in routine lung MRI protocols.
- To compare the performance of free-breathing 3D UTE and ZTE lung MRI sequences.
- To evaluate differences in image quality, including signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR), and small nodule detection capabilities between UTE and ZTE.
Main Methods:
- Twenty patients underwent both UTE and ZTE lung MRI sequences during routine examinations.
- Images from both sequences were retrospectively analyzed for subjective image quality by two independent radiologists.
- Quantitative comparisons focused on lung parenchymal signal, intrapulmonary structures, and the detection of sub-centimeter nodules, with statistical analysis performed.
Main Results:
- ZTE sequences demonstrated significantly higher SNR in lung parenchyma (p < 0.05) and superior SNR and CNR for peripheral bronchi and small pulmonary arteries (all p < 0.05) compared to UTE.
- Radiologists rated ZTE images as superior in depicting normal structures and overall acceptability (p < 0.05).
- Diagnostic accuracy for sub-centimeter nodules was significantly higher with ZTE (AUCs 0.972 and 0.946) than with UTE (AUCs 0.885 and 0.855). Mean scan time for ZTE (131s) was substantially shorter than for UTE (467s), with reduced acoustic noise.
Conclusions:
- High-resolution volumetric ZTE is a feasible addition to routine lung MRI protocols.
- ZTE provides superior pulmonary structural information, characterized by enhanced SNR and CNR, compared to UTE.
- ZTE offers improved diagnostic accuracy for small nodules and significantly reduced scan times, making it an efficient alternative for lung MRI.
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