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Rapid MR imaging of the pediatric brain using the fast spin-echo technique
S S Ahn1, M T Mantello, K M Jones
1Department of Radiology, Children's Hospital, Boston, MA 02115.
Purpose:
To evaluate diagnostic reliability and to establish optimal scanning techniques of a recently developed Fast Spin-echo MR pulse sequence that allows rapid proton density-weighted and T2-weighted imaging.
Methods:
We compared lesion conspicuity and signal intensity measurements on Fast Spin-echo and conventional spin-echo sequences in 81 patients ranging from 1 week to 25 years in age on a 1.5-T MR unit. A total of 28 Fast Spin-echo dual-echo images (14 slice locations) were obtained in 2:08 minutes with a 256 x 128 matrix or in 3:12 minutes with a 256 x 192 matrix at a TR of 2000 msec and two excitations.
Results:
Lesion conspicuity and characterization on Fast Spin-echo images compared favorably with conventional spin-echo images in our series when pseudo-TEs of 15 and 90 msec were employed for proton density-weighted and T2-weighted images, respectively. Fast Spin-echo images yielded diagnostic information in four nonsedated patients whose conventional spin-echo images were either degraded by motion or unobtainable. Fat signal remained bright on T2-weighted Fast Spin-echo images. Magnetic-susceptibility effects were slightly reduced with Fast Spin-echo but did not pose any diagnostic problem in our series.
Conclusion:
Diagnostically reliable rapid dual-echo brain images can be obtained with Fast Spin-echo sequences.
Insights
Fast Spin-echo magnetic resonance imaging (MRI) provides reliable and rapid dual-echo brain imaging. This technique enhances lesion detection and characterization, proving valuable in clinical settings.
Area of Science:
- Radiology
- Medical Imaging
- Neuroimaging
Background:
- Conventional spin-echo (CSE) sequences are standard for magnetic resonance imaging (MRI).
- Rapid imaging techniques are crucial for reducing motion artifacts and improving patient comfort.
- Fast Spin-echo (FSE) is a newer pulse sequence designed for accelerated image acquisition.
Purpose of the Study:
- To assess the diagnostic reliability of a novel Fast Spin-echo (FSE) MR pulse sequence.
- To determine optimal scanning parameters for FSE proton density-weighted and T2-weighted imaging.
- To compare FSE performance against conventional spin-echo (CSE) sequences.
Main Methods:
- Compared lesion conspicuity and signal intensity between FSE and CSE sequences in 81 patients (1 week to 25 years).
- Acquired dual-echo FSE images using a 1.5-T MR unit with varying matrix sizes and a repetition time (TR) of 2000 msec.
- Evaluated images acquired with pseudo-echo times (TEs) of 15 msec (proton density-weighted) and 90 msec (T2-weighted).
Main Results:
- FSE images demonstrated comparable lesion conspicuity and characterization to CSE images.
- FSE provided diagnostic information in four patients where CSE images were degraded by motion or unobtainable.
- Fat signal remained bright on T2-weighted FSE images, and susceptibility effects were minimally reduced without diagnostic compromise.
Conclusions:
- Fast Spin-echo sequences enable diagnostically reliable, rapid dual-echo brain imaging.
- FSE offers a valuable alternative to CSE for brain MRI, particularly in pediatric or uncooperative patients.
- The FSE technique facilitates efficient image acquisition without sacrificing diagnostic quality.