ArticleJournal of biomedical physics & engineering2018
MRS Shimming: An Important Point Which Should not be Ignored.
Article in Journal of biomedical physics & engineering, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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Who cites it
7 citing papers in PubMed.
- Unconscious switching of dorsal and medial pathways for plasticity and stability during NREM and REM sleep.bioRxiv : the preprint server for biology · 2025Article
- Diffusion magnetic resonance spectroscopy captures microglial reactivity related to gut-derived systemic lipopolysaccharide: A preliminary study.Brain, behavior, and immunity · 2024Article
- Influence and optimization strategy of the magnetic field in 1.5 T MR-linac liver stereotactic radiotherapy.Radiation oncology (London, England) · 2023Article
- Coregistration of magnetic resonance spectroscopy and polysomnography for sleep analysis in human subjects.STAR protocols · 2021Article
- Complementary contributions of non-REM and REM sleep to visual learning.Nature neuroscience · 2020Article
- Repeatability and Reproducibility ofFrontiers in human neuroscience · 2020Article
- A method for cranial target delineation in radiotherapy treatment planning aided by single-voxel magnetic resonance spectroscopy: evaluation using a custom-designed gel-based phantom and simulations.The British journal of radiology · 2019Article
Corrections and comments
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Authors and funding
8 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundProton magnetic resonance spectroscopy (MRS) is a well-known device for analyzing the biological fluids metabolically. Obtaining accurate and reliable information via MRS needs a homogeneous magnetic field in order to provide well-defined peaks and uniform water suppression. There are lots of reasons which can disturb the magnetic field homogeneity which can be corrected by a process known as shimming. This study is intended to recall the importance of shimming and also the significant role of quality control (QC) in achieving an accurate quantification. MATERIAL AND
methodAn acrylic cylindrical quality control phantom was designed as an analog of brain MRS test phantoms in order to control the accuracy of the obtained signal of a 1.5 T Siemens MRI system which belonged to one of Shiraz hospitals. The signal of NAA, Cho, Cr, the combination of these metabolites and also the distilled water, which was used in this study, was evaluated using separate phantoms. A QC test was performed using Siemens QC phantom and a standard test phantom.
resultsThe spectrum of our home- made phantom had a significant difference with the expected spectrum. The results of checking the spectrum of metabolites separately also confirmed that there was a systemic problem that affects all the signals originated from all metabolites and even the pure distilled water. The MRS system could not pass QC tests, and peak broadening was common in all spectra. The complex spectrum of standard test phantom was not produced successfully by the MRS system. DISCUSSION: By a simple check of the water peak characteristics, lots of information can be obtained, one of which is the status of shimming that has a considerable effect on the accuracy of the spectrum. Thus, performing an automatic or manual shimming is not a criterion of the spectrum accuracy, and performing a periodic quality control using a test phantom by a specialist is necessary.
conclusionBriefly, the quality control of MRS and all the other clinical device must be taken seriously. Sometimes QC can be the boundary of a right or a wrong decision for the patient.
Indexed as
Identifiers
30320030PMC6169119What OpenQuestion holds
Registered trials
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