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Published on: July 29, 2013
MRI quality assurance using the ACR phantom in a multi-unit imaging center
Toni M Ihalainen1, Nadja T Lönnroth, Juha I Peltonen
1HUS Helsinki Medical Imaging Center, Helsinki, Finland. toni.ihalainen@hus.fi
Acta Oncologica (Stockholm, Sweden)
|July 20, 2011
Summary
The American College of Radiology (ACR) MRI phantom is a feasible tool for quality assurance in multi-unit imaging centers, potentially replacing older methods. Further automation can enhance its cost-effectiveness and objectivity.
Area of Science:
- Medical Imaging Physics
- Radiology Quality Assurance
Background:
- Magnetic Resonance Imaging (MRI) instrumentation requires robust quality assurance (QA) to address technical and image quality issues.
- The study's regional imaging center previously relied on MagNET phantom measurements for long-term QA.
- The American College of Radiology (ACR) offers an accreditation program with a standardized MRI phantom and image quality protocol, including clinical relevance assessment criteria.
Purpose of the Study:
- To evaluate the feasibility and effectiveness of the ACR MRI phantom for quality assurance in a multi-unit imaging center.
- To compare the ACR phantom protocol with existing MagNET phantom measurements.
Main Methods:
- Acquired ACR phantom images using head coils on 11 MRI systems (3.0 T, 1.5 T, 1.0 T) following ACR scanning instructions.
- Scanned both ACR-defined T1- and T2-weighted sequences and site-specific clinical T1- and T2-weighted brain sequences.
- Performed duplicate measurements, analyzed images, and compared results against ACR acceptance criteria.
Main Results:
- The ACR phantom acquisition was faster than MagNET phantom measurements.
- 91% and 73% of MRI systems passed the ACR test on the first and second measurement rounds, respectively.
- Slice thickness accuracy deviations and differences in high-contrast spatial resolution were noted between ACR and site sequences. Image intensity uniformity in 3.0 T systems was slightly below ACR limits.
Conclusions:
- The ACR MRI phantom method is suitable for quality assurance in a multi-unit imaging center and can potentially replace MagNET phantom tests.
- Implementing automatic image analysis for the ACR protocol could significantly improve cost-effectiveness and objectivity.
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