Journal of Magnetic Resonance Imaging最新文献

{"title":"Musculoskeletal MRI Relaxometry Phantom for T1, T2, and T1ρ Measurements.","authors":"Jeehun Kim, Stephen E Russek, Karl F Stupic, Cassandra M Stoffer, Kathryn E Keenan, David R Rutkowski, Jeff Kammerman, Jean H Brittain, Zhiyuan Zhang, Xiaojuan Li","doi":"10.1002/jmri.70570","DOIUrl":"https://doi.org/10.1002/jmri.70570","url":null,"abstract":"<p><strong>Background: </strong>Quantitative MRI (qMRI) requires quality assurance methods that reflect in vivo conditions to ensure consistent measurements with low bias and high reproducibility over time, across multiple sites, and across different MRI scanner manufacturers and models.</p><p><strong>Purpose: </strong>To develop a musculoskeletal (MSK) relaxometry phantom that spans the T1 and T2 (and T1ρ as an exploratory aim) ranges of articular cartilage.</p><p><strong>Study type: </strong>Longitudinal phantom study.</p><p><strong>Phantom: </strong>A cylindrical phantom designed to fit within multiple knee coil configurations using dedicated support stands. The phantom contains 12 gel-filled vials spanning T1 values of 300-1200 ms, T2 values of 10-100 ms, and T1ρ values of 20-120 ms, and an MR-visible thermometer.</p><p><strong>Field strength/sequence: </strong>3T; single-echo spin-echo T2; inversion-recovery T1; spin-lock prepared T1ρ for NMR (spin-lock frequencies 300-5000 Hz) and MAPSS T1ρ for MRI (spin-lock frequency 500 Hz).</p><p><strong>Assessment: </strong>NMR and two MRI systems from different vendors were used. A prototype phantom (n = 1), production phantoms (n = 12), and matched NMR samples were evaluated. NMR data acquired at multiple temperatures served as reference and enabled temperature correction of MRI measurements. The prototype phantom was scanned longitudinally (15 measurements over 725 days) to assess stability, while production phantoms were scanned at a single timepoint to evaluate batch consistency.</p><p><strong>Statistical analysis: </strong>Measurement variability and agreement were assessed using coefficients of variation (CVs), concordance correlation coefficients (CCCs), and Bland-Altman analysis for NMR-MRI comparison, longitudinal stability, batch consistency, and inter-vendor reproducibility.</p><p><strong>Results: </strong>After temperature correction, longitudinal CVs were 1.1% (T1), 1.8% (T2), and 1.6% (T1ρ). Production phantoms showed inter-phantom CVs of 0.8% (T1), 1.2% (T2), and 0.9% (T1ρ). NMR and MRI measurements demonstrated strong agreement (CCCs > 0.99 for T1, T2, and T1ρ) with biases < 6%. Inter-vendor MRI comparisons yielded CCCs > 0.99 for T1 and T2.</p><p><strong>Data conclusion: </strong>The phantom demonstrated excellent stability and reproducibility with temperature correction, supporting its use for quality assurance in longitudinal and multisite qMRI studies.</p><p><strong>Evidence level: </strong>1.</p><p><strong>Technical efficacy: </strong>Stage 1.</p>","PeriodicalId":16140,"journal":{"name":"Journal of Magnetic Resonance Imaging","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149168640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effects of Cerebrovascular Reactivity on the Coupling Between CSF Dynamics and Global Neurovascular Fluctuations in the Alzheimer's Disease Continuum.","authors":"Yutian Wang, Dayong Ge, Zhecheng Jin, Li Zhao, Dan Wu, Zixuan Lin","doi":"10.1002/jmri.70584","DOIUrl":"https://doi.org/10.1002/jmri.70584","url":null,"abstract":"<p><strong>Background: </strong>Mounting evidence revealed that the weakened coupling between CSF flow and global brain activity (gBOLD-CSF coupling) is associated with Alzheimer's Disease (AD) pathology and cognitive impairments. However, the mechanisms underlying this weakened coupling remain unclear.</p><p><strong>Purpose: </strong>To investigate the region-specific effects of cerebrovascular reactivity (CVR) on the gBOLD-CSF coupling.</p><p><strong>Study type: </strong>Retrospective.</p><p><strong>Population: </strong>One hundred ninety-eight cognitively normal controls (70.2 ± 8.7 years; 128 female, 70 male), 115 mild cognitive impairment patients (73.1 ± 7.1 years; 50 female, 65 male), and 24 dementia patients (75 ± 9.3 years; 14 female, 10 male) from ADNI.</p><p><strong>Field strength/sequence: </strong>3 T gradient-echo blood-oxygenation-level-dependent (BOLD).</p><p><strong>Assessment: </strong>gBOLD-CSF coupling and CVR maps were respectively derived from resting-state fMRI. The former reflects the temporal coordination between CSF dynamics and global neurovascular fluctuations, while the latter quantifies the capacity of vessels to dilate or constrict. AD-related clinical scales including Aβ-PET, tau-PET, and cognitive assessments were also involved.</p><p><strong>Statistical tests: </strong>Linear regression models were employed to examine the association of gBOLD-CSF coupling with AD-related clinical scales and with CVR of major cerebral arteries. Mediation analyses were employed to investigate the potential pathways linking these metrics. p < 0.05 was considered significant.</p><p><strong>Results: </strong>gBOLD-CSF coupling was significantly associated with cognitive assessments (CDR Global: β = 0.366; ADAS-Cog: β = 10.613), accumulation of cortical summary Aβ (β = 37.937) and tau in Braak stage ROIs (Braak I-II: β = 0.444; Braak III-IV: β = 0.565; Braak V-VI: β = 0.474). Analysis also revealed the regional differences in the association of gBOLD-CSF coupling with CVR. CVR, especially in posterior cerebral arteries (PCA) region, was significantly associated with gBOLD-CSF coupling (β = -0.313). The gBOLD-CSF coupling, both directly and through its effect on the accumulation of Aβ and tau, mediated the association between CVR and cognition.</p><p><strong>Data conclusion: </strong>Data revealed a significant CVR-coupling association in the PCA region and potential pathways linking CVR, gBOLD-CSF coupling, AD pathology, and cognition, providing deeper insights into weakened gBOLD-CSF coupling in AD.</p><p><strong>Evidence level: </strong>3.</p><p><strong>Technical efficacy: </strong>Stage 2.</p>","PeriodicalId":16140,"journal":{"name":"Journal of Magnetic Resonance Imaging","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149137103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Editorial for \"The Effects of Cerebrovascular Reactivity on the Coupling Between CSF Dynamics and Global Neurovascular Fluctuations in the Alzheimer's Disease Continuum\".","authors":"Binu P Thomas, Krishnendu Vyas","doi":"10.1002/jmri.70585","DOIUrl":"https://doi.org/10.1002/jmri.70585","url":null,"abstract":"","PeriodicalId":16140,"journal":{"name":"Journal of Magnetic Resonance Imaging","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149137144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ZTE-STAR: 4D Zero-Echo-Time (ZTE) Imaging With a Spiral Phyllotaxis Trajectory Using Temporal Total Variation Reconstruction and Algebraic Dead-Time Infilling.","authors":"Naoto Fujita, Tomokazu Tsurugizawa, Yasuhiko Terada","doi":"10.1002/jmri.70583","DOIUrl":"https://doi.org/10.1002/jmri.70583","url":null,"abstract":"<p><strong>Background: </strong>Zero-echo-time (ZTE) imaging detects signals from tissues with extremely short <math> <mrow><msub><mi>T</mi> <mn>2</mn></msub> </mrow> </math> relaxation times by minimizing echo time. Dead-time gaps and flexible temporal sampling remain challenges for dynamic applications such as functional MRI (fMRI).</p><p><strong>Purpose: </strong>To propose and evaluate ZTE-STAR, a dynamic ZTE framework combining paired-spoke spiral phyllotaxis sampling, algebraic dead-time infilling, and temporal total variation (TTV) reconstruction.</p><p><strong>Study type: </strong>Prospective.</p><p><strong>Subjects/phantom: </strong>A numerical phantom and eight C57BL/6J mice (one for image quality assessment; seven for resting-state fMRI).</p><p><strong>Fieldstrength/sequence: </strong>9.4 T; ZTE with a modified Spiral Phyllotaxis Golden Angle trajectory.</p><p><strong>Assessment: </strong>Reconstruction quality was assessed using peak signal-to-noise ratio (PSNR) and structural similarity index (SSIM), and temporal response using the 90%-10% fall time. In vivo assessment included temporal signal-to-noise ratio (tSNR), rigid-body motion, and exploratory group independent component analysis (ICA).</p><p><strong>Statistical test: </strong>Descriptive statistics were used for PSNR, SSIM, motion, and tSNR. ICA was exploratory, with no inferential statistical testing.</p><p><strong>Results: </strong>In trajectory-reconstruction ablation at comparable spoke counts, paired spiral phyllotaxis with TTV yielded PSNR 32.12 dB versus 29.75 dB for conventional radial sampling with TTV. ZTE-STAR at 864 spokes yielded PSNR 30.90 dB, SSIM 0.903, and 90%-10% fall time 1.8-2.1 s; at 2880 versus 2948 spokes, fall times were 5.0-5.2 versus 4.9 s. With realistic measurement noise, ZTE-STAR at 864 spokes yielded PSNR 30.12 ± 0.01 dB and SSIM 0.838 ± 0.001 versus 24.79 ± 0.01 dB and 0.604 ± 0.001 for conventional radial sampling at 2948 spokes. Whole-brain tSNR ranged from 26.6 to 30.1. Resting-state ICA yielded an exploratory default mode network-like component.</p><p><strong>Data conclusion: </strong>ZTE-STAR enabled shorter retrospective bins while maintaining reconstruction quality at lower spoke counts and supported exploratory resting-state ZTE-fMRI in mice.</p><p><strong>Technical efficacy: </strong>Stage 1.</p><p><strong>Evidence level: </strong>4.</p>","PeriodicalId":16140,"journal":{"name":"Journal of Magnetic Resonance Imaging","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149137139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Editorial for \"Diffusion Basis Spectrum Imaging (DBSI): A Multicompartment Diffusion Model Linking Regional Microstructural Heterogeneity With Proliferation and Survival in High-Grade Gliomas\".","authors":"Toshiaki Taoka","doi":"10.1002/jmri.70565","DOIUrl":"https://doi.org/10.1002/jmri.70565","url":null,"abstract":"","PeriodicalId":16140,"journal":{"name":"Journal of Magnetic Resonance Imaging","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149137070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Editorial for \"MR Cytometry of Microstructural Changes in Breast Cancer: Association With Treatment Response and Prognosis\".","authors":"Diwei Shi","doi":"10.1002/jmri.70586","DOIUrl":"https://doi.org/10.1002/jmri.70586","url":null,"abstract":"","PeriodicalId":16140,"journal":{"name":"Journal of Magnetic Resonance Imaging","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149137059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Differences in Intracranial Artery and Brain Impairment Between Pediatric and Adult Moyamoya Disease: A Comparative MRI Study.","authors":"Xiangrong Du, Hongtao Zhang, Baobao Li, Yuan Liu, Shitong Liu, Cong Han, Fugeng Sheng, Guangming Duan, Xihai Zhao, Mingming Lu, Jianming Cai","doi":"10.1002/jmri.70516","DOIUrl":"https://doi.org/10.1002/jmri.70516","url":null,"abstract":"<p><strong>Background: </strong>Moyamoya disease (MMD) exhibits incidence peaks in children and adults, but the age-related differences in MR imaging features remain unclear.</p><p><strong>Purpose: </strong>To determine the differences in intracranial artery and brain impairment between pediatric and adult patients with MMD using MR imaging.</p><p><strong>Study type: </strong>Retrospective.</p><p><strong>Population: </strong>Four hundred and three patients (median age, 42 years [IQR, 29-51 years]; 268 adults) diagnosed with MMD by digital subtraction angiography (DSA), with routine clinical brain MRI and high-resolution intracranial vessel wall imaging within 1 week of DSA.</p><p><strong>Field strength/sequence: </strong>Pre- and post-contrast 3D T1 SPACE and routine brain MRI sequences including T1-weighted, T2-weighted, FLAIR, diffusion weighted imaging, and 3D time-of-flight at 3.0 T.</p><p><strong>Assessment: </strong>Three neuroradiologists (10, 6, and 11 years of neurovascular imaging experience) assessed vessel wall enhancement grades and patterns, basal ganglia and centrum semiovale perivascular spaces, white matter hyperintensities, lacunes, infarction, hemorrhage, and intracranial arterial luminal stenosis.</p><p><strong>Statistical tests: </strong>Student's t-test, Mann-Whitney U test, Chi-square test, or Fisher's exact test, and logistic regression analysis. A two-sided p value < 0.05 was considered statistically significant.</p><p><strong>Results: </strong>Adult patients were significantly more likely to have bilateral intracranial internal carotid artery stenosis (90.7% vs. 81.5%), Grade 2 enhancement in the posterior cerebral artery (9.0% vs. 2.2%), and significantly higher risk of intracranial hemorrhage (odds ratio (OR) = 5.216, 95% confidence interval (CI): 2.312-11.767), periventricular WMHs (OR = 2.634, 95% CI: 1.263-5.494), and lacunes (OR = 2.012, 95% CI: 1.179-3.432) compared to pediatric patients. In contrast, pediatric patients were significantly more prone to bilateral anterior cerebral artery (ACA) stenosis and vessel wall enhancement, and had significantly higher prevalence of Grade 1 enhancement at the origins of the middle cerebral artery and ACA, as well as significantly higher odds of PVSs in the centrum semiovale (OR for adults = 0.447, 95% CI: 0.210-0.949) compared to adult patients.</p><p><strong>Data conclusion: </strong>The intracranial arterial and brain impairments assessed by MR imaging significantly differed between adult and pediatric patients with MMD.</p><p><strong>Evidence level: </strong>3.</p><p><strong>Technical efficacy: </strong>Stage 5.</p>","PeriodicalId":16140,"journal":{"name":"Journal of Magnetic Resonance Imaging","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149136967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MR Cytometry of Microstructural Changes in Breast Cancer: Association With Treatment Response and Prognosis.","authors":"Xiaoxia Wang, Yao Huang, Ruicheng Ba, Ying Cao, Xueqin Gong, Xiaosong Lan, Sun Tang, Lu Wang, Ting Yin, Dan Wu, Jiuquan Zhang","doi":"10.1002/jmri.70587","DOIUrl":"https://doi.org/10.1002/jmri.70587","url":null,"abstract":"<p><strong>Background: </strong>Although MR cytometry can probe microstructural features, the longitudinal trajectories of these changes during neoadjuvant chemotherapy (NAC) and their association with treatment response and prognosis remain poorly defined.</p><p><strong>Purpose: </strong>To characterize longitudinal changes in NAC-associated cellular microstructural properties and evaluate microstructural parameters for predicting pathologic complete response (pCR) and disease-free survival (DFS) in breast cancer.</p><p><strong>Study type: </strong>Prospective.</p><p><strong>Population: </strong>194 patients with invasive breast cancer underwent 713 MRI examinations.</p><p><strong>Field strength/sequence: </strong>3.0 T, oscillating gradient spin-echo (OGSE) and pulsed gradient spin-echo (PGSE) sequences.</p><p><strong>Assessment: </strong>MR cytometry was acquired at four time-points: pretreatment, early, mid-, and late treatment. Microstructural parameters were estimated using the IMPULSED (imaging microstructural parameters using limited spectrally edited diffusion) model. Microstructural parameters were compared with histopathologic measurements.</p><p><strong>Statistical tests: </strong>Generalized estimating equations, logistic regression, bootstrap resampling, the DeLong test with Bonferroni correction, Cox proportional hazards regression, Kaplan-Meier analysis with the log-rank test, the C-index, and the Pearson correlation coefficient were performed. p < 0.05 was significant.</p><p><strong>Results: </strong>Four logistic regression models were developed for predicting pCR, based on molecular subtype alone or combined with diameter at Time 1, ADC_50Hz at Time 2, or cellularity at Time 2. The clinicopathological-cellularity model achieved the best performance in predicting pCR (AUC = 0.89). For DFS, a Cox model incorporating ER status, HER2 status, cT stage, cN stage, and extracellular diffusivity at Time 1 yielded a C-index of 0.81; patients stratified by the median risk score into low- and high-risk groups differed significantly in DFS. Extracellular diffusion was positively correlated with pathologic stroma fraction (r = 0.56).</p><p><strong>Data conclusion: </strong>MR cytometry demonstrated longitudinal microstructural alterations during NAC and shows potential for predicting pCR and stratifying patients by DFS risk in breast cancer patients.</p><p><strong>Level of evidence: 1: </strong></p><p><strong>Technical efficacy: </strong>Stage 2.</p>","PeriodicalId":16140,"journal":{"name":"Journal of Magnetic Resonance Imaging","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149137087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Editorial for \"Differences in Intracranial Artery and Brain Impairment Between Pediatric and Adult Moyamoya Disease: A Comparative MRI Study\".","authors":"Dandan Jiang, Bochao Cheng","doi":"10.1002/jmri.70515","DOIUrl":"https://doi.org/10.1002/jmri.70515","url":null,"abstract":"","PeriodicalId":16140,"journal":{"name":"Journal of Magnetic Resonance Imaging","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149137119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Survey and Analysis of the Current Status of MRI Safety Management in Medical Institutions in Korea.","authors":"Chung-Hwan Kang, Kyoo-Jin Yeon, Yu-Jin Shin, Kyung-Bae Lee","doi":"10.1002/jmri.70581","DOIUrl":"https://doi.org/10.1002/jmri.70581","url":null,"abstract":"<p><strong>Background: </strong>MRI safety management is essential for patient safety and for standardizing institutional practices. However, nationwide data on MRI safety readiness in Korean tertiary hospitals remain limited.</p><p><strong>Purpose: </strong>To evaluate MRI safety management across all 47 Korean tertiary hospitals and identify major gaps in safety infrastructure, staffing, and education.</p><p><strong>Study type: </strong>Cross-sectional census survey.</p><p><strong>Population: </strong>MRI safety managers from all 47 Korean tertiary hospitals in 2025.</p><p><strong>Assessment: </strong>A structured 50-item questionnaire was developed based on the American College of Radiology (ACR) MRI safety guidelines. A composite safety maturity index (0-100) was calculated as the unweighted arithmetic mean of four domain scores derived from 32 binary safety-practice items, with mandatory items weighted 2 and recommended items weighted 1 in accordance with the 2024 ACR Manual on MR Safety.</p><p><strong>Statistical tests: </strong>Descriptive statistics were used to summarize institutional characteristics and safety compliance. Comparisons of staffing patterns by time period were evaluated using inferential tests, with statistical significance set at p < 0.05.</p><p><strong>Results: </strong>The response rate was 100% (47/47). The mean number of MRI units per hospital was 5.32 ± 3.50, and 3.0 T systems were predominant. Compliance was universal for closed-circuit television (CCTV) monitoring and MR Conditional monitoring devices but was low for ferromagnetic detection systems (17.0%), Magnetic Resonance Safety Officer (MRSO) appointment (17.0%), and Level 1 safety education (23.4%). MRI-related safety incidents were reported by 44.7% of hospitals. Two-person staffing decreased significantly from 97.9% on weekday daytime hours to 55.3% on Saturdays, 44.7% at night, and 38.3% on holidays. The overall composite safety maturity score was 63.08 ± 15.04.</p><p><strong>Data conclusion: </strong>Considerable variability remains in MRI safety management across Korean tertiary hospitals. These findings highlight the need for national MRI safety standards in the Republic of Korea.</p><p><strong>Evidence level: </strong>4.</p><p><strong>Technical efficacy: </strong>Stage 4.</p>","PeriodicalId":16140,"journal":{"name":"Journal of Magnetic Resonance Imaging","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149136982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}