This article examines GE MRI ARC vs ASSET imaging options. We explore the key differences and advantages to each scan technique.
When it comes to magnetic resonance imaging (MRI), GE offers two powerful imaging options known as ARC (Autocalibrating Reconstruction for Cartesian imaging) and ASSET (Array Spatial Sensitivity Encoding Technique).
These techniques are designed to enhance image acquisition, reduce scan time, and improve image quality. But what’s the difference between ARC and ASSET? Let’s take a closer look at each technique to understand their unique capabilities.
ARC is a data-driven parallel imaging technique that significantly reduces scan time while maintaining image quality. By synthesizing missing data from neighboring source data in all three imaging dimensions (slice, phase, and frequency), ARC minimizes the need for calibration lines. This results in faster and more accurate image reconstruction.
This innovative approach allows for highly accelerated MR data acquisition, reducing artifacts and enhancing overall image quality. However, it’s important to note that ARC is only available if the selected coil and imaging option support it.
When selecting ARC, several factors should be taken into account to ensure optimal results. Below we detail scan considerations when using the GE MRI ARC imaging option.
First, it’s crucial to position the patient appropriately and select a compatible PSD (Pulse Sequence Design), application, and coil. If the selected PSD, application, or coil does not support ARC, it will not be available in the imaging option screen.
Additionally, choosing the correct phase or slice acceleration factor is important, and 2D and 3D PSDs have different acceleration capabilities.
Adjusting the frequency direction may be necessary to achieve the best parallel imaging direction.
Careful consideration must be given to these trade-offs and artifacts observed in specific directions should be addressed by reducing or turning off acceleration in those directions.
It’s essential to understand that acceleration factors affect the signal-to-noise ratio (SNR) and can introduce parallel imaging artifacts like aliasing and noise amplification.
Click here for more information about MRI scan parameter trade-offs.
Turbo ARC, an extension of ARC, further enhances scan acquisition time for specific procedures. This feature is available with LAVA with Flex Imaging Option, VIBRANT with Flex Imaging Option, and 3D dual echo scans.
By adjusting the Turbo ARC level, the scan time can be further reduced. This makes it particularly useful for patients with short breath-hold capabilities or when acquiring two arterial phases in one breath-hold for simplified dynamic timing.
It’s important to note that increasing the Turbo ARC level may result in parallel imaging alias artifacts in certain protocols.
The ASSET imaging option offers faster scanning capabilities with various imaging applications, such as brain, abdomen, chest, fMRI, extremities, and breath-hold angiography. It is particularly effective in reducing artifacts with EPI sequences and minimizing blurring with FSE sequences.
ASSET is commonly used when compromising the signal-to-noise ratio (SNR) is not a major concern.
Additionally, ASSET proves effective in reducing artifacts with EPI (Echo Planar Imaging) sequences, which are prone to distortions. It is also useful in decreasing blurring in the FSE family, particularly in SSFSE and DWI sequences.
Importantly, the scan time with ASSET is comparable to that of a non-ASSET scan, ensuring efficient imaging without compromising time considerations.
By leveraging parallel imaging techniques, ASSET optimizes image acquisition, enhancing both speed and quality. This feature proves especially useful in time-sensitive scenarios like breath-hold examinations and dynamic studies.
When selecting ASSET for the FSE-XL8 and FRFSE pulse sequences, the reduction in scan time relies on multiple factors. Determining factors which affect scan include ETL, PFOV, NEX, and matrix size. However, changing the phase matrix value may not impact scan time in certain combinations of ETL and PFOV selections.
The scanning range of ASSET image acquisition should align within the borders of the calibration acquisition’s scanning range. This helps to avoid blank regions in the final images. See example of scan setup below.
Both ARC and ASSET offer valuable enhancements to MRI imaging, allowing for faster scans and improved image quality. However, it’s crucial to strike a balance between scan time reduction and image quality, taking into account factors like parallel imaging artifacts, SNR, and coil coverage. By understanding the capabilities and considerations of each technique, healthcare professionals can optimize MRI imaging protocols for their patients, ensuring efficient and accurate diagnostic outcomes.
In conclusion, GE’s MRI ARC and ASSET provide advanced imaging options that can significantly enhance MRI examinations. Whether it’s reducing scan time with ARC or improving image quality with ASSET, these techniques empower healthcare providers to deliver efficient and high-quality diagnostic imaging to their patients. By staying informed about the latest imaging advancements, medical professionals can continually refine their practices and provide optimal care.
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