Applications of the Dixon technique in the evaluation of the musculoskeletal system

Lins, Carolina Freitas; Salmon, Carlos Ernesto Garrido; Nogueira-Barbosa, Marcello Henrique

doi:10.1590/0100-3984.2019.0086

Cited by 24 publications

(12 citation statements)

References 33 publications

(83 reference statements)

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“…Moreover, the Dixon technique is useful in detecting iron deposition related to T2* effects and susceptibility artifacts owing to the double-echo sequence 24 . Additionally, Dixon-based images provide better signal-to-noise efficiency than other conventional fat-suppressed methods 25 . In our results, TA based on T1-weighted IP/OP/WO images demonstrated moderate classification scores, and the favorable classification scores were obtained by T1-weighted WO images.…”

Section: Discussionmentioning

confidence: 99%

The utility of texture analysis of kidney MRI for evaluating renal dysfunction with multiclass classification model

Hara

Nagawa

Yamamoto

et al. 2022

Sci Rep

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We evaluated a multiclass classification model to predict estimated glomerular filtration rate (eGFR) groups in chronic kidney disease (CKD) patients using magnetic resonance imaging (MRI) texture analysis (TA). We identified 166 CKD patients who underwent MRI comprising Dixon-based T1-weighted in-phase (IP)/opposed-phase (OP)/water-only (WO) images, apparent diffusion coefficient (ADC) maps, and T2* maps. The patients were divided into severe, moderate, and control groups based on eGFR borderlines of 30 and 60 mL/min/1.73 m2. After extracting 93 texture features (TFs), dimension reduction was performed using inter-observer reproducibility analysis and sequential feature selection (SFS) algorithm. Models were created using linear discriminant analysis (LDA); support vector machine (SVM) with linear, rbf, and sigmoid kernels; decision tree (DT); and random forest (RF) classifiers, with synthetic minority oversampling technique (SMOTE). Models underwent 100-time repeat nested cross-validation. Overall performances of our classification models were modest, and TA based on T1-weighted IP/OP/WO images provided better performance than those based on ADC and T2* maps. The most favorable result was observed in the T1-weighted WO image using RF classifier and the combination model was derived from all T1-weighted images using SVM classifier with rbf kernel. Among the selected TFs, total energy and energy had weak correlations with eGFR.

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Section: Discussionmentioning

confidence: 99%

The utility of texture analysis of kidney MRI for evaluating renal dysfunction with multiclass classification model

Hara

Nagawa

Yamamoto

et al. 2022

Sci Rep

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“…[37][38][39] The Dixon acquisition method enables uniform fat suppression based on chemical shift and was combined with T1-weighted VIBE sequences in our study. 40,41 Additionally, T2-weighted images, acquired using Periodically Rotated Overlapping ParallEL Lines with Enhanced Reconstruction (PROPELLER, or vendor-specifically termed BLADE) or HASTE, can be used for the evaluation of disease in organs. 42,43 The PROPELLER sequence is based on TSE-related image acquisition using a radial readout scheme with parallel data lines rotating and partially overlapping around the center of the k-space.…”

Section: Discussionmentioning

confidence: 99%

“…Radial VIBE image acquisition represents a vendor‐specific solution based on an optimized T1‐weighted 3D GRE sequence with integrated radial k ‐space sampling and a modified “stack‐of‐stars” approach 37–39 . The Dixon acquisition method enables uniform fat suppression based on chemical shift and was combined with T1‐weighted VIBE sequences in our study 40,41 . Additionally, T2‐weighted images, acquired using Periodically Rotated Overlapping ParallEL Lines with Enhanced Reconstruction (PROPELLER, or vendor‐specifically termed BLADE) or HASTE, can be used for the evaluation of disease in organs 42,43 .…”

Section: Discussionmentioning

confidence: 99%

Free‐breathing accelerated whole‐body MRI using an automated workflow: Comparison with conventional breath‐hold sequences

et al. 2022

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Whole‐body magnetic resonance imaging (MRI) has become increasingly popular in oncology. However, the long acquisition time might hamper its widespread application. We sought to assess and compare free‐breathing sequences with conventional breath‐hold examinations in whole‐body MRI using an automated workflow process. This prospective study consisted of 20 volunteers and six patients with a variety of pathologies who had undergone whole‐body 1.5‐T MRI that included T1‐weighted radial and Dixon volumetric interpolated breath‐hold examination sequences. Free‐breathing sequences were operated by using an automated user interface. Image quality, diagnostic confidence, and image noise were evaluated by two experienced radiologists. Additionally, signal‐to‐noise ratio was measured. Diagnostic performance for the overall detection of pathologies was assessed using the area under the receiver operating characteristics curve (AUC). Study participants were asked to rate their examination experiences in a satisfaction survey. MR free‐breathing scans were rated as at least equivalent to conventional MR scans in more than 92% of cases, showing high overall diagnostic accuracy (95% [95% CI 92–100]) and performance (AUC 0.971, 95% CI 0.942–0.988; p < 0.0001) for the assessment of pathologies at simultaneously reduced examination times (25 ± 2 vs. 32 ± 3 min; p < 0.0001). Interrater agreement was excellent for both free‐breathing (ϰ = 0.96 [95% CI 0.88–1.00]) and conventional scans (ϰ = 0.93 [95% CI 0.84–1.00]). Qualitative and quantitative assessment for image quality, image noise, and diagnostic confidence did not differ between the two types of MR image acquisition (all p > 0.05). Scores for patient satisfaction were significantly better for free‐breathing compared with breath‐hold examinations (p = 0.0145), including significant correlations for the grade of noise (r = 0.79, p < 0.0001), tightness (r = 0.71, p < 0.0001), and physical fatigue (r = 0.52, p = 0.0065). In summary, free‐breathing whole‐body MRI in tandem with an automated user interface yielded similar diagnostic performance at equivalent image quality and shorter acquisition times compared to conventional breath‐hold sequences.

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“…Dixon is usually acquired in post-contrast T1 weighting sequences [12]. Four types of images are obtained by Dixon techniques, which are water-only (WO), fat-only (FO), in-phase and opposed-phase (OP) images [13,14].…”

Section: Introductionmentioning

confidence: 99%

Dixon chemical shift MR sequences for demonstrating of bone marrow vertebral metastasis

Zarad

Elmaaty

Shanab

2022

Egypt J Radiol Nucl Med

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Background This study aimed to investigate the diagnostic performance and clinical utility of different MR Dixon sequences in the characterization of vertebral metastasis in a patient with a history of malignant neoplasm and compare the results with 18-F FDG PET CT. Patients were subjected to MR imaging of the dorsal and lumbosacral spine (1.5 T MR machine) using conventional MR, T2 Dixon and T1 post-contrast Dixon. Results This study involved 40 patients (45% female and 55% male) with 161 metastatic lesions and median age 61.5 years. The sensitivities of T1 post-contrast water-only (WO), fat-only (FO) and opposed-phase (OP) Dixon for diagnosis of vertebral metastasis were 92.6%, 89.4% and 83.1%, respectively, while the sensitivity of T2 (WO, OP) Dixon was 78.3% with 100% specificity for both T1 and T2 Dixon. There were excellent positive clinical utilities of T1 post-contrast WO (0.925), FO (0.894) and OP (0.826) Dixon with the good positive clinical utility of T2 Dixon (0.783) for lesion finding. There were fair negative clinical utilities of T1 WO (0.636) and FO (0.553) Dixon with poor negative clinical utilities of T1 OP (0.429), T2 WO and OP (0.375) Dixon for lesion screening. 15% was the best in-phase/opposed-phase ratio for differentiation between metastatic and benign vertebral lesions. Conclusions MR Dixon techniques are sensitive and specific for the diagnosis of vertebral metastasis. T1 post-contrast and T2 Dixons have excellent and good positive clinical utilities for lesion finding with fair and poor negative clinical utilities for lesion screening, respectively.

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Applications of the Dixon technique in the evaluation of the musculoskeletal system

Cited by 24 publications

References 33 publications

The utility of texture analysis of kidney MRI for evaluating renal dysfunction with multiclass classification model

The utility of texture analysis of kidney MRI for evaluating renal dysfunction with multiclass classification model

Free‐breathing accelerated whole‐body MRI using an automated workflow: Comparison with conventional breath‐hold sequences

Dixon chemical shift MR sequences for demonstrating of bone marrow vertebral metastasis

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