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Impact of magnetic field strength and receiver coil in ocular MRI: a phantom and patient study
K Erb-Eigner1, C Warmuth, M Taupitz
1Department of Radiology, Charité - Universitätsmedizin Berlin, Germany. katharina.erb@charite.de
Purpose:
Generally, high-resolution MRI of the eye is performed with small loop surface coils. The purpose of this phantom and patient study was to investigate the influence of magnetic field strength and receiver coils on image quality in ocular MRI.
Materials And Methods:
The eyeball and the complex geometry of the facial bone were simulated by a skull phantom with swine eyes. MR images were acquired with two small loop surface coils with diameters of 4 cm and 7 cm and with a multi-channel head coil at 1.5 and 3 Tesla, respectively. Furthermore, MRI of the eye was performed prospectively in 20 patients at 1.5 Tesla (7 cm loop surface coil) and 3 Tesla (head coil). These images were analysed qualitatively and quantitatively and statistical significance was tested using the Wilcoxon-signed-rank test (a p-value of less than 0.05 was considered to indicate statistical significance).
Results:
The analysis of the phantom images yielded the highest mean signal-to-noise ratio (SNR) at 3 Tesla with the use of the 4 cm loop surface coil. In the phantom experiment as well as in the patient studies the SNR was higher at 1.5 Tesla by applying the 7 cm surface coil than at 3 Tesla by applying the head coil. Concerning the delineation of anatomic structures no statistically significant differences were found.
Conclusion:
Our results show that the influence of small loop surface coils on image quality (expressed in SNR) in ocular MRI is higher than the influence of the magnetic field strength. The similar visibility of detailed anatomy leads to the conclusion that the image quality of ocular MRI at 3 Tesla remains acceptable by applying the head coil as a receiver coil.
Insights
Small loop surface coils significantly impact ocular MRI image quality more than magnetic field strength. Image quality at 3 Tesla remains acceptable with head coils, ensuring good visibility of eye anatomy.
Area of Science:
- Radiology
- Medical Imaging
- Ophthalmology
Background:
- High-resolution ocular MRI typically utilizes small loop surface coils.
- Understanding the impact of magnetic field strength and coil type on image quality is crucial for optimizing ocular MRI.
Purpose of the Study:
- To investigate the influence of magnetic field strength (1.5T and 3T) and receiver coils on image quality in ocular MRI.
- To compare image quality metrics between different coil types and field strengths using phantom and patient studies.
Main Methods:
- Ocular MRI was performed on a phantom and in 20 patients at 1.5T and 3T.
- Acquisitions utilized 4 cm and 7 cm loop surface coils, and a multi-channel head coil.
- Image quality was assessed quantitatively (signal-to-noise ratio) and qualitatively, with statistical analysis using the Wilcoxon signed-rank test.
Main Results:
- The 4 cm loop surface coil at 3 Tesla yielded the highest mean signal-to-noise ratio (SNR) in phantom images.
- Across phantom and patient studies, the 7 cm surface coil at 1.5 Tesla provided higher SNR than the head coil at 3 Tesla.
- No statistically significant differences were observed in the delineation of anatomical structures between tested configurations.
Conclusions:
- The choice of small loop surface coils has a greater impact on ocular MRI image quality (SNR) than magnetic field strength.
- Ocular MRI at 3 Tesla provides acceptable image quality when using a head coil, maintaining detailed anatomical visibility.
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