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Peng L, Chen B, Yu E, Lin Y, Lin J, Zheng D, Fu Y, Chen Z, Zheng H, Zhan Z, Chen Y. The application value of LAVA-flex sequences in enhanced MRI scans of nasopharyngeal carcinoma: comparison with T1WI-IDEAL. Front Oncol 2024; 14:1320280. [PMID: 38420018 PMCID: PMC10899686 DOI: 10.3389/fonc.2024.1320280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 01/16/2024] [Indexed: 03/02/2024] Open
Abstract
Introduction Magnetic resonance imaging (MRI) staging scans are critical for the diagnosis and treatment of patients with nasopharyngeal cancer (NPC). We aimed to evaluate the application value of LAVA-Flex and T1WI-IDEAL sequences in MRI staging scans. Methods Eighty-four newly diagnosed NPC patients underwent both LAVA-Flex and T1WI-IDEAL sequences during MRI examinations. Two radiologists independently scored the acquisitions of image quality, fat suppression quality, artifacts, vascular and nerve display. The obtained scores were compared using the Wilcoxon signed rank test. According to the signal intensity (SI) measurements, the uniformity of fat suppression, contrast between tumor lesions and subcutaneous fat tissue, and signal-to-noise ratio (SNR) were compared by the paired t-test. Results Compared to the T1WI-IDEAL sequence, LAVA-Flex exhibited fewer artifacts (P<0.05), better visualization of nerves and vessels (P<0.05), and performed superior in the fat contrast ratio of the primary lesion and metastatic lymph nodes (0.80 vs. 0.52, 0.81 vs. 0.56, separately, P<0.001). There was no statistically significant difference in overall image quality, tumor signal-to-noise ratio (SNR), muscle SNR, and the detection rate of lesions between the two sequences (P>0.05). T1WI-IDEAL was superior to LAVA-Flex in the evaluation of fat suppression uniformity (P<0.05). Discussion LAVA-Flex sequence provides satisfactory image quality and better visualization of nerves and vessels for NPC with shorter scanning times.
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Affiliation(s)
- Li Peng
- Department of Radiology, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, Fuzhou, Fujian, China
| | - Bijuan Chen
- Department of Radiation Oncology, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, Fuzhou, Fujian, China
| | - Erhan Yu
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, Fujian, China
| | - Yifei Lin
- Department of Radiology, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, Fuzhou, Fujian, China
| | - Jiahao Lin
- Department of Radiology, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, Fuzhou, Fujian, China
| | - Dechun Zheng
- Department of Radiology, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, Fuzhou, Fujian, China
| | - Yu Fu
- School of Basic Medical Sciences of Fujian Medical University, Fuzhou, Fujian, China
| | - Zhipeng Chen
- School of Basic Medical Sciences of Fujian Medical University, Fuzhou, Fujian, China
| | - Hanchen Zheng
- Department of Medical Oncology, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, Fuzhou, Fujian, China
| | - Zhouwei Zhan
- Department of Medical Oncology, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, Fuzhou, Fujian, China
| | - Yunbin Chen
- Department of Radiology, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, Fuzhou, Fujian, China
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Athira R, Cannane S, Thushara R, Poyyamoli S, Nedunchelian M. Diagnostic Accuracy of Standalone T2 Dixon Sequence Compared with Conventional MRI in Sacroiliitis. Indian J Radiol Imaging 2022; 32:314-323. [PMID: 36177276 PMCID: PMC9514893 DOI: 10.1055/s-0042-1753467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Aim
The aim of this article was to assess the profile of T2-weighted (T2W) multipoint Dixon sequence and conventional sequences in magnetic resonance imaging (MRI) of sacroiliac joints for the diagnosis of active and chronic sacroiliitis.
Settings and Design
Prospective observational study.
Materials and Methods
Thirty-seven patients with sacroiliitis underwent MRI with conventional coronal oblique short tau inversion recovery, T1W sequences, and T2W multipoint Dixon sequences. T1 fat-saturated postcontrast sequences were added in active cases. Comparisons were made between conventional and T2 Dixon sequences both quantitatively and qualitatively.
Statistical Analysis
Paired
t
-test was used to study the difference in contrast–noise ratio (CNR) between two groups. Chi-squared analysis with
p
-value of ≤ 0.05 was used to test the significant association of different sequences.
Results
Water only images had highest mean CNR (296.35 ± 208.28) for the detection of bone marrow edema/osteitis. T1W (186.09 ± 96.96) and opposed-phase (OP) images (279.22 ± 188.40) had highest mean CNR for the detection of subchondral sclerosis and periarticular fat deposition, respectively. OP images (
p
-value <0.001) followed by fat-only (FO) images (
p
-value = 0.001) were superior to T1W sequences in detecting periarticular fat deposition. In-phase (IP) images in detecting subchondral sclerosis and IP and FO images in detecting cortical erosions were comparable to conventional T1W sequences (
p
-value < 0.001).
Conclusions
T2 Dixon sequences are superior or comparable to conventional MR sequences in detection of sacroiliitis, except ankylosis. Hence, Dixon can be used as a single sequence to replace the multiple sequences used in conventional imaging protocol of acute sacroiliac joints due to higher image quality. It can be used as an additional sequence in case of chronic sacroiliitis to increase the confidence and accuracy of diagnosis.
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Affiliation(s)
- R. Athira
- Department of Radiology, Kovai Medical Center and Hospital, Coimbatore, Tamil Nadu, India
| | - Seetharaman Cannane
- Department of Radiology, Kovai Medical Center and Hospital, Coimbatore, Tamil Nadu, India
| | - R. Thushara
- Department of Radiology, Kovai Medical Center and Hospital, Coimbatore, Tamil Nadu, India
| | - Santhosh Poyyamoli
- Department of Radiology, Kovai Medical Center and Hospital, Coimbatore, Tamil Nadu, India
| | - Meena Nedunchelian
- Department of Radiology, Kovai Medical Center and Hospital, Coimbatore, Tamil Nadu, India
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Usefulness of rapid MR angiography using two-point Dixon for evaluating carotid and aortic plaques. Neuroradiology 2021; 64:693-702. [PMID: 34559244 DOI: 10.1007/s00234-021-02812-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 08/30/2021] [Indexed: 12/15/2022]
Abstract
PURPOSE Recently, various magnetic resonance imaging (MRI) modalities have been developed to easily detect carotid and aortic plaques, but these techniques are time-consuming and vulnerable to motion artifacts. We investigated the utility of a gradient echo MRI technique known as liver acquisition with volume acceleration flexible (LAVA-Flex) to detect carotid and aortic atherosclerotic plaques. METHODS Ten patients who underwent carotid endarterectomy (CEA) were assessed regarding the correspondence between LAVA-Flex findings and the histopathology of excised carotid plaques. In addition, 47 patients with cryptogenic ischemic stroke underwent LAVA-Flex and transesophageal echocardiography (TEE) for detection of embolic sources in the thoracic aorta. We analyzed the relationship between the thickness of the aortic plaque measured by TEE and the presence of high-intensity lesions on LAVA-Flex. RESULTS Nine of 10 patients (90.0%) who underwent CEA showed a high-intensity carotid lesion on LAVA-Flex, which corresponded pathologically to plaques containing large lipid cores and hemorrhage. Twenty-four (51.1%) of 47 cryptogenic stroke patients showed a high-intensity lesion in the thoracic aorta on LAVA-Flex; of these, 21 (87.5%) also demonstrated a large plaque (thickness ≥4 mm) on TEE. Twenty-two (95.7%) of 23 patients without a high-intensity lesion on LAVA-Flex demonstrated no large plaque on TEE. LAVA-Flex had a sensitivity of 95.5% and a specificity of 88.0% in patients with large plaques. CONCLUSION This study showed that LAVA-Flex successfully detected carotid and aortic plaques. This imaging technique may be useful to rapidly diagnose and evaluate carotid and aortic plaques, which are critical risk factors for aortogenic stroke.
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York V, Sultan N, Thapa M, Chaturvedi A. Musculoskeletal MRI in Infants: Technical Considerations, Pitfalls and Optimization Strategies. Semin Roentgenol 2021; 56:277-287. [PMID: 34281680 DOI: 10.1053/j.ro.2021.05.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Vincent York
- Department of Radiology, Rochester General Hospital, Rochester, NY.
| | - Nadia Sultan
- Department of Imaging Sciences, University of Rochester Medical Center, Rochester, NY
| | - Mahesh Thapa
- Department of Radiology, University of Washington, Seattle, WA
| | - Apeksha Chaturvedi
- Department of Imaging Sciences, University of Rochester Medical Center, Rochester, NY
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Dai X, Lei Y, Liu Y, Wang T, Ren L, Curran WJ, Patel P, Liu T, Yang X. Intensity non-uniformity correction in MR imaging using residual cycle generative adversarial network. Phys Med Biol 2020; 65:215025. [PMID: 33245059 PMCID: PMC7934018 DOI: 10.1088/1361-6560/abb31f] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Correcting or reducing the effects of voxel intensity non-uniformity (INU) within a given tissue type is a crucial issue for quantitative magnetic resonance (MR) image analysis in daily clinical practice. Although having no severe impact on visual diagnosis, the INU can highly degrade the performance of automatic quantitative analysis such as segmentation, registration, feature extraction and radiomics. In this study, we present an advanced deep learning based INU correction algorithm called residual cycle generative adversarial network (res-cycle GAN), which integrates the residual block concept into a cycle-consistent GAN (cycle-GAN). In cycle-GAN, an inverse transformation was implemented between the INU uncorrected and corrected magnetic resonance imaging (MRI) images to constrain the model through forcing the calculation of both an INU corrected MRI and a synthetic corrected MRI. A fully convolution neural network integrating residual blocks was applied in the generator of cycle-GAN to enhance end-to-end raw MRI to INU corrected MRI transformation. A cohort of 55 abdominal patients with T1-weighted MR INU images and their corrections with a clinically established and commonly used method, namely, N4ITK were used as a pair to evaluate the proposed res-cycle GAN based INU correction algorithm. Quantitatively comparisons of normalized mean absolute error (NMAE), peak signal-to-noise ratio (PSNR), normalized cross-correlation (NCC) indices, and spatial non-uniformity (SNU) were made among the proposed method and other approaches. Our res-cycle GAN based method achieved an NMAE of 0.011 ± 0.002, a PSNR of 28.0 ± 1.9 dB, an NCC of 0.970 ± 0.017, and a SNU of 0.298 ± 0.085. Our proposed method has significant improvements (p < 0.05) in NMAE, PSNR, NCC and SNU over other algorithms including conventional GAN and U-net. Once the model is well trained, our approach can automatically generate the corrected MR images in a few minutes, eliminating the need for manual setting of parameters.
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Affiliation(s)
- Xianjin Dai
- Department of Radiation Oncology and Winship Cancer Institute, Emory University, Atlanta, GA, 30322, United States of America
| | - Yang Lei
- Department of Radiation Oncology and Winship Cancer Institute, Emory University, Atlanta, GA, 30322, United States of America
| | - Yingzi Liu
- Department of Radiation Oncology and Winship Cancer Institute, Emory University, Atlanta, GA, 30322, United States of America
| | - Tonghe Wang
- Department of Radiation Oncology and Winship Cancer Institute, Emory University, Atlanta, GA, 30322, United States of America
| | - Lei Ren
- Department of Radiation Oncology, Duke University, Durham, NC, 27708, United States of America
| | - Walter J Curran
- Department of Radiation Oncology and Winship Cancer Institute, Emory University, Atlanta, GA, 30322, United States of America
| | - Pretesh Patel
- Department of Radiation Oncology and Winship Cancer Institute, Emory University, Atlanta, GA, 30322, United States of America
| | - Tian Liu
- Department of Radiation Oncology and Winship Cancer Institute, Emory University, Atlanta, GA, 30322, United States of America
| | - Xiaofeng Yang
- Department of Radiation Oncology and Winship Cancer Institute, Emory University, Atlanta, GA, 30322, United States of America
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Wendl CM, Eiglsperger J, Dendl LM, Brodoefel H, Schebesch KM, Stroszczynski C, Fellner C. Fat suppression in magnetic resonance imaging of the head and neck region: is the two-point DIXON technique superior to spectral fat suppression? Br J Radiol 2018; 91:20170078. [PMID: 29436841 DOI: 10.1259/bjr.20170078] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
OBJECTIVE The aim of our study was to systematically compare two-point Dixon fat suppression (FS) and spectral FS techniques in contrast enhanced imaging of the head and neck region. METHODS Three independent readers analysed coronal T1 weighted images recorded after contrast medium injection with Dixon and spectral FS techniques with regard to FS homogeneity, motion artefacts, lesion contrast, image sharpness and overall image quality. RESULTS 85 patients were prospectively enrolled in the study. Images generated with Dixon-FS technique were of higher overall image quality and had a more homogenous FS over the whole field of view compared with the standard spectral fat-suppressed images (p < 0.001). Concerning motion artefacts, flow artefacts, lesion contrast and image sharpness no statistically significant difference was observed. CONCLUSION The Dixon-FS technique is superior to the spectral technique due to improved homogeneity of FS and overall image quality while maintaining lesion contrast. Advances in knowledge: T1 with Dixon FS technique offers, compared to spectral FS, significantly improved FS homogeneity and over all image quality in imaging of the head and neck region.
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Affiliation(s)
- Christina M Wendl
- 1 Department of Radiology, University Hospital Regensburg , Regensburg , Germany
| | | | - Lena-Marie Dendl
- 1 Department of Radiology, University Hospital Regensburg , Regensburg , Germany
| | - Harald Brodoefel
- 1 Department of Radiology, University Hospital Regensburg , Regensburg , Germany.,3 Department of Radiology, Ortenau Klinikum Lahr-Ettenheim , Lahr , Germany
| | | | | | - Claudia Fellner
- 1 Department of Radiology, University Hospital Regensburg , Regensburg , Germany
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Sun J, Xing Z, Chen J, Zha T, Cao Y, Zhang D, Zeng D, Xing W. Fat status detection and histotypes differentiation in solid renal masses using Dixon technique. Clin Imaging 2018; 51:12-22. [PMID: 29414519 DOI: 10.1016/j.clinimag.2018.01.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Revised: 01/20/2018] [Accepted: 01/23/2018] [Indexed: 11/26/2022]
Abstract
PURPOSE To detect fat status and differentiate histotypes of renal masses by using Dixon technique. MATERIALS AND METHODS This study included 134 solid renal masses. Signal intensity index (SII) and fat fraction (FF) in different histotypes were compared. RESULTS Only angiomyolipoma (AML), clear cell renal cell carcinoma (RCC), and papillary RCC were confirmed to contain fat. The FF of 16.8% can effectively differentiate AML from clear cell RCC, so did the SII of 9.2% can differentiate clear cell RCC from non-clear cell RCC and rare benign histotypes. CONCLUSION Dixon technique successfully evaluated the fat status and histotypes of renal masses.
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Affiliation(s)
- Jun Sun
- Department of Radiology, The Third Affiliated Hospital of Soochow University, Changzhou, Jiangsu 213003, China
| | - Zhaoyu Xing
- Department of Urology, The Third Affiliated Hospital of Soochow University, Changzhou, Jiangsu 213003, China
| | - Jie Chen
- Department of Radiology, The Third Affiliated Hospital of Soochow University, Changzhou, Jiangsu 213003, China
| | - Tingting Zha
- Department of Radiology, The Third Affiliated Hospital of Soochow University, Changzhou, Jiangsu 213003, China
| | - Yunjie Cao
- Department of Urology, The Third Affiliated Hospital of Soochow University, Changzhou, Jiangsu 213003, China
| | - Dachuan Zhang
- Department of Pathology, The Third Affiliated Hospital of Soochow University, Changzhou, Jiangsu 213003, China
| | - Dexing Zeng
- Department of Medicine & Radiology, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Wei Xing
- Department of Radiology, The Third Affiliated Hospital of Soochow University, Changzhou, Jiangsu 213003, China.
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Kalovidouri A, Firmenich N, Delattre BMA, Picarra M, Becker CD, Montet X, Botsikas D. Fat suppression techniques for breast MRI: Dixon versus spectral fat saturation for 3D T1-weighted at 3 T. Radiol Med 2017. [PMID: 28643295 DOI: 10.1007/s11547-017-0782-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
OBJECTIVE To compare two fat suppression techniques used for 3D T1-weighted sequence in breast MRI (magnetic resonance imaging), namely Dixon versus spectral fat saturation (fat sat). MATERIALS AND METHODS All breast MRI examinations performed in a Philips 3 T unit between March 2013 and October 2015 including either a Dixon or a fat sat sequence were retrospectively analyzed. The examinations were subjectively evaluated by two independent experienced readers in a scale of 5 for overall quality of fat suppression, homogeneity of fat suppression, definition of anatomic structures and focal lesions, diagnostic confidence for axillary and internal mammary regions and the presence of artifacts, 1 corresponding to excellent and 5 to non-diagnostic quality. Contrast-to-noise-ratio (CNR) measurements for muscle and focal lesions were also performed. RESULTS Overall 161 women (mean age 51.6 ± 12.0 years) underwent 189 MR examinations, 113 with the fat saturation and 76 with the Dixon sequence. Interobserver variability was good (kappa = 0.757). In all subjectively evaluated parameters, the Dixon sequence was superior to the fat sat (p < 0.05). Mean values of CNR for muscle and focal lesions were 9.98 (±4.2), 17.9 (±7.53) for the fat sat and 18.3 (±10.4) and 29.3 (±14.1) for the Dixon sequence, respectively (p < 0.001). CONCLUSION 3D T1 Dixon sequence is superior to fat sat for dedicated breast MRI at 3 T, in terms of efficiency of fat suppression and image quality with the added advantage of optimal exploration of the axillary areas.
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Affiliation(s)
- Anastasia Kalovidouri
- Radiology Department, Geneva University Hospital, Rue Gabrielle-Perret-Gentil 4, 1205, Geneva, Switzerland.
| | - Natacha Firmenich
- Radiology Department, Geneva University Hospital, Rue Gabrielle-Perret-Gentil 4, 1205, Geneva, Switzerland
| | - Benedicte M A Delattre
- Radiology Department, Geneva University Hospital, Rue Gabrielle-Perret-Gentil 4, 1205, Geneva, Switzerland
| | - Marlise Picarra
- Radiology Department, Geneva University Hospital, Rue Gabrielle-Perret-Gentil 4, 1205, Geneva, Switzerland
| | - Christoph D Becker
- Radiology Department, Geneva University Hospital, Rue Gabrielle-Perret-Gentil 4, 1205, Geneva, Switzerland
| | - Xavier Montet
- Radiology Department, Geneva University Hospital, Rue Gabrielle-Perret-Gentil 4, 1205, Geneva, Switzerland
| | - Diomidis Botsikas
- Radiology Department, Geneva University Hospital, Rue Gabrielle-Perret-Gentil 4, 1205, Geneva, Switzerland
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Toselli B, Tortora D, Severino M, Arnulfo G, Canessa A, Morana G, Rossi A, Fato MM. Improvement in White Matter Tract Reconstruction with Constrained Spherical Deconvolution and Track Density Mapping in Low Angular Resolution Data: A Pediatric Study and Literature Review. Front Pediatr 2017; 5:182. [PMID: 28913326 PMCID: PMC5582070 DOI: 10.3389/fped.2017.00182] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Accepted: 08/10/2017] [Indexed: 12/14/2022] Open
Abstract
INTRODUCTION Diffusion-weighted magnetic resonance imaging (DW-MRI) allows noninvasive investigation of brain structure in vivo. Diffusion tensor imaging (DTI) is a frequently used application of DW-MRI that assumes a single main diffusion direction per voxel, and is therefore not well suited for reconstructing crossing fiber tracts. Among the solutions developed to overcome this problem, constrained spherical deconvolution with probabilistic tractography (CSD-PT) has provided superior quality results in clinical settings on adult subjects; however, it requires particular acquisition parameters and long sequences, which may limit clinical usage in the pediatric age group. The aim of this work was to compare the results of DTI with those of track density imaging (TDI) maps and CSD-PT on data from neonates and children, acquired with low angular resolution and low b-value diffusion sequences commonly used in pediatric clinical MRI examinations. MATERIALS AND METHODS We analyzed DW-MRI studies of 50 children (eight neonates aged 3-28 days, 20 infants aged 1-8 months, and 22 children aged 2-17 years) acquired on a 1.5 T Philips scanner using 34 gradient directions and a b-value of 1,000 s/mm2. Other sequence parameters included 60 axial slices; acquisition matrix, 128 × 128; average scan time, 5:34 min; voxel size, 1.75 mm × 1.75 mm × 2 mm; one b = 0 image. For each subject, we computed principal eigenvector (EV) maps and directionally encoded color TDI maps (DEC-TDI maps) from whole-brain tractograms obtained with CSD-PT; the cerebellar-thalamic, corticopontocerebellar, and corticospinal tracts were reconstructed using both CSD-PT and DTI. Results were compared by two neuroradiologists using a 5-point qualitative score. RESULTS The DEC-TDI maps obtained presented higher anatomical detail than EV maps, as assessed by visual inspection. In all subjects, white matter (WM) tracts were successfully reconstructed using both tractography methodologies. The mean qualitative scores of all tracts obtained with CSD-PT were significantly higher than those obtained with DTI (p-value < 0.05 for all comparisons). CONCLUSION CSD-PT can be successfully applied to DW-MRI studies acquired at 1.5 T with acquisition parameters adapted for pediatric subjects, thus providing TDI maps with greater anatomical detail. This methodology yields satisfactory results for clinical purposes in the pediatric age group.
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Affiliation(s)
- Benedetta Toselli
- Department of Informatics, Bioengineering, Robotics and System Engineering (DIBRIS), University of Genoa, Genoa, Italy
| | | | | | - Gabriele Arnulfo
- Department of Informatics, Bioengineering, Robotics and System Engineering (DIBRIS), University of Genoa, Genoa, Italy
| | - Andrea Canessa
- Department of Informatics, Bioengineering, Robotics and System Engineering (DIBRIS), University of Genoa, Genoa, Italy
| | - Giovanni Morana
- Neuroradiology Unit, Istituto Giannina Gaslini, Genoa, Italy
| | - Andrea Rossi
- Neuroradiology Unit, Istituto Giannina Gaslini, Genoa, Italy
| | - Marco Massimo Fato
- Department of Informatics, Bioengineering, Robotics and System Engineering (DIBRIS), University of Genoa, Genoa, Italy
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Cao W, Li F, Gong J, Liu D, Deng Y, Kang L, Zhou Z. Liver acquisition with acceleration volume acquisition gadolinium-enhanced magnetic resonance combined with T2 sequences in the diagnosis of local recurrence of rectal cancer. JOURNAL OF X-RAY SCIENCE AND TECHNOLOGY 2016; 24:855-863. [PMID: 27612049 DOI: 10.3233/xst-160594] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
To investigate the efficacy of liver acquisition with acceleration volume acquisition (LAVA) gadolinium-enhanced magnetic resonance (MR) sequences and to assess its added accuracy in diagnosing local recurrence (LR) of rectal cancer with conventional T2-weighted fast spin echo (FSE) sequences. Pelvic MRI, including T2-weighted FSE sequences, gadolinium-enhanced sequences of LAVA and T1-weighted FSE with fat suppression, was performed on 225 patients with postoperative rectal cancer. Two readers evaluated the presence of LR according to "T2" (T2 sequences only), "T2 + LAVA-Gad" (LAVA and T2 imaging), and "T2 + T1-fs-Gad" (T1 fat suppression-enhanced sequence with T2 images). To evaluate diagnostic efficiency, imaging quality with LAVA and T1-fs-Gad by subjective scores and the signal intensity (SI) ratio. In the result, the SI ratio of LAVA was significantly higher than that of T1-fs-Gad (p = 0.0001). The diagnostic efficiency of "T2 + LAVA-Gad" was better than that of "T2 + T1-fs-Gad" (p = 0.0016 for Reader 1, p = 0.0001 for Reader 2) and T2 imaging only (p = 0.0001 for Reader 1; p = 0.0001 for Reader 2). Therefore, LAVA gadolinium-enhanced MR increases the accuracy of diagnosis of LR from rectal cancer and could replace conventional T1 gadolinium-enhanced sequences in the postoperative pelvic follow-up of rectal cancer.
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Affiliation(s)
- Wuteng Cao
- Department of Radiology, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Fangqian Li
- Department of Radiology, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Jiaying Gong
- Department of Radiology, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Dechao Liu
- Department of Radiology, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Yanhong Deng
- Department of Oncology, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Liang Kang
- Department of Colorectal Surgery, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Zhiyang Zhou
- Department of Radiology, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
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Saito S, Tanaka K, Hashido T. Liver acquisition with volume acceleration flex on 70-cm wide-bore and 60-cm conventional-bore 3.0-T MRI. Radiol Phys Technol 2016; 9:154-60. [PMID: 26739299 DOI: 10.1007/s12194-015-0344-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Revised: 12/21/2015] [Accepted: 12/22/2015] [Indexed: 12/15/2022]
Abstract
This study aimed to compare the uniformity of fat suppression and image quality between liver acquisition with volume acceleration flex (LAVA-Flex) and LAVA on 60-cm conventional-bore and 70-cm wide-bore 3.0-T magnetic resonance imaging (MRI). The uniformity of fat suppression by LAVA-Flex and LAVA was assessed as the efficiency of suppression of superficial fat at the levels of the liver dome, porta, and renal hilum. Percentage standard deviation (%SD) was calculated using the following equation: %SD (%) = 100 × SD of the regions of interest (ROIs)/mean value of the signal intensity (SI) in the ROIs. Signal-to-noise ratio (SNR) and contrast ratio (CR) were calculated. In the LAVA sequence, the %SD in all slices on wide-bore 3.0-T MRI was significantly higher than that on conventional-bore 3.0-T MRI (P < 0.01). However, there was no significant difference in fat signal uniformity between the conventional and wide-bore scanners when LAVA-Flex was used. In the liver, there were no significant differences in SNR between the two sequences. However, the SNR in the pancreas was lower for the wide-bore scanner than for the conventional-bore scanner for both sequences (P < 0.05). There were no significant differences in CR for the liver and fat between LAVA-Flex and LAVA in both scanners. The CR in the LAVA-Flex images obtained by wide-bore MRI was significantly higher than that in the LAVA-Flex images recorded by conventional-bore MRI (P < 0.001). LAVA-Flex offers more homogenous fat suppression in the upper abdomen than LAVA for both conventional and wide-bore 3.0-T MRI.
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Affiliation(s)
- Shigeyoshi Saito
- Department of Medical Physics and Engineering, Division of Medical Technology and Science, Course of Health Science, Graduate School of Medicine, Osaka University, 1-7 Yamadaoka, Suita, Osaka, 565-0871, Japan.
| | - Keiko Tanaka
- Division of Radiology, Department of Medical Technology, Osaka University Hospital, 2-15 Yamadaoka, Suita City, Osaka, 565-0871, Japan
| | - Takashi Hashido
- Division of Radiology, Department of Medical Technology, Osaka University Hospital, 2-15 Yamadaoka, Suita City, Osaka, 565-0871, Japan
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Samji K, Alrashed A, Shabana WM, McInnes MDF, Bayram E, Schieda N. Comparison of high-resolution T1W 3D GRE (LAVA) with 2-point Dixon fat/water separation (FLEX) to T1W fast spin echo (FSE) in prostate cancer (PCa). Clin Imaging 2016; 40:407-13. [DOI: 10.1016/j.clinimag.2015.11.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2015] [Revised: 11/10/2015] [Accepted: 11/19/2015] [Indexed: 01/06/2023]
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Saito S, Tanaka K, Tarewaki H, Koyama Y, Hashido T. [Evaluation of Image Quality in Three-dimensional Fat-suppressed T 1-weighted Images with Fast Acquisition Mode for Upper Abdomen]. Nihon Hoshasen Gijutsu Gakkai Zasshi 2016; 72:1122-1127. [PMID: 27867172 DOI: 10.6009/jjrt.2016_jsrt_72.11.1122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We compared the uniformity of fat-suppression and image quality using three-dimensional fat-suppressed T1-weighted gradient-echo sequences that are liver acquisition with volume acceleration (LAVA) and Turbo-LAVA at 3.0T-MRI. The subjects were seven patients with liver disease (mean age, 66.7±8.2 years). The axial slices of two LAVA sequences were used for the comparison of the uniformity of fat-suppression and image quality at a region-of-interest (ROI) of the liver dome, the porta, and the renal hilum. To yield a quantitative measurement of the uniformity of fat suppression, the percentage standard deviation (%SD) was calculated by comparing two sequences. For image signal to noise ratio (SNR), the contrast between the liver and fat (Cliver-fat), and the liver and muscle (Cliver-muscle), the other ROIs were placed in the superficial fat, liver, spleen, pancreas, and muscle. The %SD in Turbo-LAVA (28.1±16.8%) was lower than that in LAVA (41.5±13.4%). The SNRs in Turbo-LAVA (17.8±4.1 [liver], 12.5±3.0 [pancreas], 14.7±1.6 [spleen], 8.2±3.5 [fat]) were lower than those in LAVA (20.9±6.1 [liver], 16.8±4.1 [pancreas], 17.4±2.4 [spleen], 12.0±4.5 [fat]). While, the Cliver-fat in the Turbo-LAVA (0.72±0.06) was significantly higher than that in LAVA (0.59±0.07). Turbo-LAVA sequence offers superior and more homogenous fat-suppression in comparison to LAVA sequence.
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Affiliation(s)
- Shigeyoshi Saito
- Department of Medical Engineering, Division of Health Sciences, Osaka University, Graduate School of Medicine
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Li X, Liang Q, Zhuang L, Zhang X, Chen T, Li L, Liu J, Calimente H, Wei Y, Hu J. Preliminary Study of MR Diffusion Tensor Imaging of the Liver for the Diagnosis of Hepatocellular Carcinoma. PLoS One 2015; 10:e0135568. [PMID: 26317346 PMCID: PMC4552840 DOI: 10.1371/journal.pone.0135568] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Accepted: 07/23/2015] [Indexed: 12/11/2022] Open
Abstract
OBJECTIVES To evaluate the feasibility of differentiating between hepatocellular carcinomas (HCC) and healthy liver using diffusion tensor imaging (DTI). MATERIAL AND METHODS All subjects underwent an abdominal examination on a 3.0T MRI scanner. Two radiologists independently scored the image quality (IQ). An optimal set of DTI parameters was obtained from a group of fifteen volunteers with multiple b-values (100, 300, 500, and 800 s/mm2) and various diffusion-encoding directions (NED = 6, 9, and 12)using two way ANOVA analysis. Eighteen Patients with HCC underwent DTI scans with the optimized parameters. Fractional anisotropy(FA) and average apparent diffusion coefficient (ADC) values were measured. The differences of FA and ADC values between liver healthy region and HCC lesion were compared through paired t tests. RESULTS There were no significant changes in liver IQ and FA/ADC values with increased NED(P >0.05), whereas the liver IQ and FA/ADC values decreased significantly with increased b-values(P <0.05). Good IQ, acceptable scan time and reasonable FA/ADC values were acquired using NED = 9 with b-value of (0,300) s/mm2. Using the optimized DTI sequence, ADC value of the tumor lesion was significantly lower than that of the healthy liver region (1.30 ± 0.34×10-3 vs 1.52 ± 0.27×10-3 mm2/s, P = 0.013), whereas the mean FA value of the tumor lesion (0.42 ± 0.11) was significantly higher than the normal liver region (0.32 ± 0.10) (P = 0.004). CONCLUSION Either FA or ADC value from DTI can be used to differentiate HCC from healthy liver. HCC lead to higher FA value and lower ADC value on DTI than healthy liver.
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Affiliation(s)
- Xinghui Li
- Sichuan Key Laboratory of Medical Imaging, Department of Radiology, Affiliated Hospital of North Sichuan Medical College, Nanchong, 637000, China
| | - Qi Liang
- Department of Laboratory, Affiliated Hospital of North Sichuan Medical College, Nanchong, 637000, China
| | - Ling Zhuang
- Department of Radiation Oncology, Wayne State University, Detroit, 48201, MI, United States of America
| | - Xiaoming Zhang
- Sichuan Key Laboratory of Medical Imaging, Department of Radiology, Affiliated Hospital of North Sichuan Medical College, Nanchong, 637000, China
| | - Tianwu Chen
- Sichuan Key Laboratory of Medical Imaging, Department of Radiology, Affiliated Hospital of North Sichuan Medical College, Nanchong, 637000, China
| | - Liangjun Li
- Sichuan Key Laboratory of Medical Imaging, Department of Radiology, Affiliated Hospital of North Sichuan Medical College, Nanchong, 637000, China
| | - Jun Liu
- Department of Radiology, Second Xiangya Hospital, Central South University, Changsha, 410011, China
| | - Horea Calimente
- Department of Radiology, Wayne State University, Detroit, 48201, MI, United States of America
| | - Yinan Wei
- Department of Radiology, Wayne State University, Detroit, 48201, MI, United States of America
| | - Jiani Hu
- Department of Radiology, Wayne State University, Detroit, 48201, MI, United States of America
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Affiliation(s)
- Sung Bin Park
- Department of Radiology, Chung-Ang University Hospital, Chung-Ang University College of Medicine; Dongjak-gu Korea
| | - Jong Beum Lee
- Department of Radiology, Chung-Ang University Hospital, Chung-Ang University College of Medicine; Dongjak-gu Korea
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Guglielmo FF, Mitchell DG, Roth CG, Deshmukh S. Hepatic MR Imaging Techniques, Optimization, and Artifacts. Magn Reson Imaging Clin N Am 2014; 22:263-82. [DOI: 10.1016/j.mric.2014.04.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Rousset P, Peyron N, Charlot M, Chateau F, Golfier F, Raudrant D, Cotte E, Isaac S, Réty F, Valette PJ. Bowel endometriosis: preoperative diagnostic accuracy of 3.0-T MR enterography--initial results. Radiology 2014; 273:117-24. [PMID: 24828001 DOI: 10.1148/radiol.14132803] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
PURPOSE To prospectively determine the accuracy of 3.0-T magnetic resonance (MR) enterography in the preoperative assessment of deep infiltrating endometriosis (DIE) lesions located in the bowel above the rectosigmoid junction. MATERIALS AND METHODS Institutional review board approval for this study was obtained, and each patient gave written informed consent. Over 18 months, patients with known pelvic DIE who were scheduled for surgery were recruited. Consecutive patients suspected of having bowel endometriosis above the rectosigmoid junction underwent 3.0-T MR enterography. Two blinded readers independently performed a systematic analysis of nine bowel segments above the rectosigmoid junction. MR images were compared with surgical and pathologic findings. Efficacy parameters were calculated with 95% confidence intervals (CIs). Interobserver agreement was assessed with κ statistics. RESULTS Among the 43 patients enrolled in this study, 33 underwent surgery and were included in the final analyses. Sixteen (48%) patients had bowel DIE lesions located above the rectosigmoid junction at surgery and histopathologic examination. Twenty-six lesions were analyzed, including four ileal, two ileocecal, three cecal, three appendicular, and 14 sigmoid colon lesions. For the diagnosis of these lesions, MR imaging showed sensitivities of 92% (95% confidence interval [CI]: 81.7, 100) for reader 1 and 96% (95% CI: 87.1, 100) for reader 2 and specificities of 100% (95% CI: 98.8, 100) for both readers. The κ value was 0.97. CONCLUSION These results show 3.0-T MR enterography is accurate in the preoperative diagnosis and mapping of bowel DIE lesions located above the rectosigmoid junction. Online supplemental material is available for this article.
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Affiliation(s)
- Pascal Rousset
- From Lyon 1 Claude Bernard University, Lyon, France (P.R., N.P., F.G., D.R., E.C., P.J.V.); and Departments of Radiology (P.R., N.P., M.C., F.C., F.R., P.J.V.), Obstetrics and Gynecology (F.G., D.R.), Oncologic and General Surgery (E.C.), and Pathology (S.I.), Hospices Civils de Lyon, Centre Hospitalier Lyon Sud, 165 Chemin du Grand Revoyet, 69495 Pierre Bénite, France
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Eggers H, Börnert P. Chemical shift encoding-based water-fat separation methods. J Magn Reson Imaging 2014; 40:251-68. [PMID: 24446249 DOI: 10.1002/jmri.24568] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Accepted: 12/12/2013] [Indexed: 12/13/2022] Open
Abstract
The suppression of signal from fat constitutes a basic requirement in many applications of magnetic resonance imaging. To date, this is predominantly achieved during data acquisition, using fat saturation, inversion recovery, or water excitation methods. Postponing the separation of signal from water and fat until image reconstruction holds the promise of resolving some of the problems associated with these methods, such as failure in the presence of field inhomogeneities or contrast agents. In this article, methods are reviewed that rely on the difference in chemical shift between the hydrogen atoms in water and fat to perform such a retrospective separation. The basic principle underlying these so-called Dixon methods is introduced, and some fundamental implementations of the required chemical shift encoding in the acquisition and the subsequent water-fat separation in the reconstruction are described. Practical issues, such as the selection of key parameters and the appearance of typical artifacts, are illustrated, and a broad range of applications is demonstrated, including abdominal, cardiovascular, and musculoskeletal imaging. Finally, advantages and disadvantages of these Dixon methods are summarized, and emerging opportunities arising from the availability of information on the amount and distribution of fat are discussed.
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Li XH, Zhu J, Zhang XM, Ji YF, Chen TW, Huang XH, Yang L, Zeng NL. Abdominal MRI at 3.0 T: LAVA-flex compared with conventional fat suppression T1-weighted images. J Magn Reson Imaging 2013; 40:58-66. [PMID: 24222639 DOI: 10.1002/jmri.24329] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Accepted: 07/10/2013] [Indexed: 02/05/2023] Open
Affiliation(s)
- Xing Hui Li
- Sichuan Key Laboratory of Medical Imaging; Department of Radiology; Affiliated Hospital of North Sichuan Medical College; Nanchong China
| | - Jiang Zhu
- Sichuan Key Laboratory of Medical Imaging; Department of Radiology; Affiliated Hospital of North Sichuan Medical College; Nanchong China
| | - Xiao Ming Zhang
- Sichuan Key Laboratory of Medical Imaging; Department of Radiology; Affiliated Hospital of North Sichuan Medical College; Nanchong China
| | - Yi Fan Ji
- Sichuan Key Laboratory of Medical Imaging; Department of Radiology; Affiliated Hospital of North Sichuan Medical College; Nanchong China
| | - Tian Wu Chen
- Sichuan Key Laboratory of Medical Imaging; Department of Radiology; Affiliated Hospital of North Sichuan Medical College; Nanchong China
| | - Xiao Hua Huang
- Sichuan Key Laboratory of Medical Imaging; Department of Radiology; Affiliated Hospital of North Sichuan Medical College; Nanchong China
| | - Lin Yang
- Sichuan Key Laboratory of Medical Imaging; Department of Radiology; Affiliated Hospital of North Sichuan Medical College; Nanchong China
| | - Nan Lin Zeng
- Sichuan Key Laboratory of Medical Imaging; Department of Radiology; Affiliated Hospital of North Sichuan Medical College; Nanchong China
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Comparing T1-weighted and T2-weighted three-point Dixon technique with conventional T1-weighted fat-saturation and short-tau inversion recovery (STIR) techniques for the study of the lumbar spine in a short-bore MRI machine. Clin Radiol 2013; 68:e617-23. [PMID: 23932678 DOI: 10.1016/j.crad.2013.06.004] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2012] [Revised: 06/02/2013] [Accepted: 06/03/2013] [Indexed: 11/21/2022]
Abstract
AIM To compare T1-weighted (W) fat-water separation (Dixon's technique) with T1W fat-saturation (FS) and T2W Dixon with short-tau inversion recovery (STIR) images for fat suppression in a short-bore MRI machine. MATERIALS AND METHODS Thirteen patients with lumbar disease were studied on using 1.5 T MRI machine. The protocol included T1 FS (with contrast medium administration) and/or STIR and T1W and/or T2W Dixon, for comparison. Three neuroradiologists scored the images from the two-pairs of techniques for fat suppression uniformity and lesion conspicuity. Clinical usefulness of fat-only images was also evaluated. RESULTS Regarding uniformity of fat suppression, mean scores were 2.28 (±0.49), 3.06 (±0.49), 2.39 (±0.49), and 3.15 (±0.35) for T1W FS, T1W Dixon, STIR, and T2W Dixon sequences, respectively. For the same pulse sequences, lesion conspicuity scores were 2.78 (±0.50), 2.78 (±0.27), 2.76 (±0.47), and 2.91 (±0.4), respectively. Both T1W and T2W Dixon sequences showed more homogeneous fat-suppression when compared to T1W FS (p = 0.026) and STIR (p = 0.008) techniques, but no significant difference was found for lesion conspicuity. Mean scores for the diagnostic utility of fat-only maps were, respectively, 1.72 (±0.39) and 2.48 (±0.50) for T1W and T2W Dixon. CONCLUSION Fat suppression quality was superior with Dixon when compared to the conventional sequences, but not lesion conspicuity, suggesting that both techniques are reliable for diagnosis. Dixon may be advantageous in cases where inhomogeneity artefacts are an issue. Water-only maps appear to be useful in the clinical setting.
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