Related Experiment Videos
Fast MR imaging of abdomen: application of the QD body coil and low refocusing flip angle
T Nitatori1, T Seki, J Hachiya
1Department of Radiology, Kyorin University, School of Medicine, Tokyo, Japan.
Abstract:
The fast spin-echo (FSE) method as applied to abdominal imaging has undergone considerable technical and clinical study over the past several years. However, except in a limited number of institutions, this time-saving sequence has not replaced the conventional spin-echo (CSE) method. In particular, FSE is less frequently employed for examination of the liver because FSE and CSE images of hepatic tumors and normal hepatic tissues differ significantly in terms of contrast. The signal reduction effect of magnetization transfer contrast (MTC) is affected by the number of slice sections and by the specific absorption rate (SAR). We have employed a newly developed quadrature detection (QD) body coil to enhance the signal-to-noise ratio (S/N) and a low refocusing flip angle to suppress SAR and MTC effects. We have also evaluated the effectiveness of this new method by carrying out visual assessment of clinical images and quantitative measurements of signal intensity in these images. Several problems must be overcome before the FSE method is able to replace the CSE method in the clinical examination of the abdomen. The selection of sequences with a low refocusing flip angle combined with the use of the QD body coil promises to be one possible solution to these problems.
Insights
Fast spin-echo (FSE) abdominal imaging faces challenges, particularly for liver scans, due to contrast differences. A new method using a quadrature detection (QD) body coil and low flip angles improves signal-to-noise ratio and suppresses unwanted effects.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Abdominal Radiology
- Medical Physics
Background:
- Fast spin-echo (FSE) is a time-saving MRI sequence but is underutilized in abdominal imaging, especially for liver examinations.
- Significant contrast differences exist between FSE and conventional spin-echo (CSE) images of hepatic tissues and tumors, hindering FSE adoption.
- Magnetization transfer contrast (MTC) effects in FSE are influenced by slice number and specific absorption rate (SAR), complicating image interpretation.
Purpose of the Study:
- To investigate a novel FSE approach for abdominal imaging to overcome limitations of current techniques.
- To improve image quality and reduce artifacts in FSE abdominal scans, particularly for liver imaging.
- To evaluate the efficacy of a new quadrature detection (QD) body coil and low refocusing flip angle strategy.
Main Methods:
- Utilized a newly developed quadrature detection (QD) body coil to enhance signal-to-noise ratio (S/N).
- Employed a low refocusing flip angle to suppress specific absorption rate (SAR) and magnetization transfer contrast (MTC) effects.
- Conducted visual assessment of clinical images and quantitative signal intensity measurements to evaluate the method's effectiveness.
Main Results:
- The combination of QD body coil and low refocusing flip angle demonstrated potential for improving FSE image quality.
- Enhanced signal-to-noise ratio (S/N) was achieved, alongside suppression of detrimental SAR and MTC effects.
- Clinical images and quantitative analyses indicated the promise of this new approach for abdominal MRI.
Conclusions:
- The FSE method requires further development to supplant CSE in routine abdominal examinations.
- The proposed strategy combining a low refocusing flip angle with a QD body coil offers a viable solution to current FSE challenges.
- This optimized FSE technique shows potential for improved diagnostic accuracy in abdominal and liver MRI.