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Jang W, Cho HR, Ha GW, Song JS. Quantitative and qualitative evaluation of high-quality hepatobiliary phase imaging with shortened timing and utility in patients with compromised liver function. Abdom Radiol (NY) 2024; 49:2659-2671. [PMID: 39009896 DOI: 10.1007/s00261-024-04495-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2024] [Revised: 07/05/2024] [Accepted: 07/06/2024] [Indexed: 07/17/2024]
Abstract
PURPOSE To compare high flip angle (FA) hepatobiliary-phase (hHBP) imaging with variable time intervals to conventional HBP (cHBP) to assess the impact of increased FA on image quality in shortened HBP imaging. METHODS Data from 218 patients, divided into normal liver group (n = 184) and decompensated liver group (n = 34), who underwent liver magnetic resonance imaging (MRI) including 10-min, 15-min, 20-min hHBP, and cHBP were analyzed. Signal-to-noise ratio (SNR), contrast-ratio (CR), contrast-to-noise ratio (CNR), signal intensity ratios (SIRs), and relative enhancement (RE) of the liver were calculated for quantitative analysis. Sharpness, noise, and artifacts of the image, contrast media visibility, overall image quality, and lesion conspicuity were evaluated by two abdominal radiologists. RESULTS Quantitative analysis showed that SNR, RE, SIR for liver/muscle, liver/spleen, and CR of all hHBP images demonstrated a significantly higher value compared to cHBP images in the normal liver group (p < 0.001). These values were also superior in the normal liver group compared to the decompensated liver group (p < 0.01). In qualitative analysis, both normal and decompensated liver groups exhibited significantly superior image sharpness in all hHBP images compared to cHBP images and the overall image quality of the 15-min and 20-min hHBP did not show significant difference compared to cHBP. All values tended to be better in the normal liver group than the decompensated liver group with statistical significance except for lesion conspicuity (p < 0.01). CONCLUSION High-FA HBP has proven to be a valuable image acquisition method, potentially shortening liver MR imaging time while maintaining acceptable image quality.
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Affiliation(s)
- Weon Jang
- Department of Radiology, Jeonbuk National University Medical School and Hospital, 20 Geonji-ro, Deokjin-gu, Jeonju, 54907, Jeonbuk, Korea
- Research Institute of Clinical Medicine of Jeonbuk National University, 20 Geonji-ro, Deokjin-gu, Jeonju, 54907, Jeonbuk, Korea
- Biomedical Research Institute of Jeonbuk National University Hospital, 20 Geonji-ro, Deokjin-gu, Jeonju, 54907, Jeonbuk, Korea
| | - Hyeong Ryun Cho
- Department of Radiology, Jeonbuk National University Medical School and Hospital, 20 Geonji-ro, Deokjin-gu, Jeonju, 54907, Jeonbuk, Korea
- Research Institute of Clinical Medicine of Jeonbuk National University, 20 Geonji-ro, Deokjin-gu, Jeonju, 54907, Jeonbuk, Korea
- Biomedical Research Institute of Jeonbuk National University Hospital, 20 Geonji-ro, Deokjin-gu, Jeonju, 54907, Jeonbuk, Korea
| | - Gi Won Ha
- Department of Surgery, Jeonbuk National University Medical School and Hospital, Jeonju, Korea
| | - Ji Soo Song
- Department of Radiology, Jeonbuk National University Medical School and Hospital, 20 Geonji-ro, Deokjin-gu, Jeonju, 54907, Jeonbuk, Korea.
- Research Institute of Clinical Medicine of Jeonbuk National University, 20 Geonji-ro, Deokjin-gu, Jeonju, 54907, Jeonbuk, Korea.
- Biomedical Research Institute of Jeonbuk National University Hospital, 20 Geonji-ro, Deokjin-gu, Jeonju, 54907, Jeonbuk, Korea.
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2
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Haubold J, Jost G, Theysohn JM, Ludwig JM, Li Y, Kleesiek J, Schaarschmidt BM, Forsting M, Nensa F, Pietsch H, Hosch R. Contrast Agent Dose Reduction in MRI Utilizing a Generative Adversarial Network in an Exploratory Animal Study. Invest Radiol 2023; 58:396-404. [PMID: 36728299 DOI: 10.1097/rli.0000000000000947] [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: 02/03/2023]
Abstract
OBJECTIVES The aim of this study is to use virtual contrast enhancement to reduce the amount of hepatobiliary gadolinium-based contrast agent in magnetic resonance imaging with generative adversarial networks (GANs) in a large animal model. METHODS With 20 healthy Göttingen minipigs, a total of 120 magnetic resonance imaging examinations were performed on 6 different occasions, 50% with reduced (low-dose; 0.005 mmol/kg, gadoxetate) and 50% standard dose (normal-dose; 0.025 mmol/kg). These included arterial, portal venous, venous, and hepatobiliary contrast phases (20 minutes, 30 minutes). Because of incomplete examinations, one animal had to be excluded. Randomly, 3 of 19 animals were selected and withheld for validation (18 examinations). Subsequently, a GAN was trained for image-to-image conversion from low-dose to normal-dose (virtual normal-dose) with the remaining 16 animals (96 examinations). For validation, vascular and parenchymal contrast-to-noise ratio (CNR) was calculated using region of interest measurements of the abdominal aorta, inferior vena cava, portal vein, hepatic parenchyma, and autochthonous back muscles. In parallel, a visual Turing test was performed by presenting the normal-dose and virtual normal-dose data to 3 consultant radiologists, blinded for the type of examination. They had to decide whether they would consider both data sets as consistent in findings and which images were from the normal-dose study. RESULTS The pooled dynamic phase vascular and parenchymal CNR increased significantly from low-dose to virtual normal-dose (pooled vascular: P < 0.0001, pooled parenchymal: P = 0.0002) and was found to be not significantly different between virtual normal-dose and normal-dose examinations (vascular CNR [mean ± SD]: low-dose 17.6 ± 6.0, virtual normal-dose 41.8 ± 9.7, and normal-dose 48.4 ± 12.2; parenchymal CNR [mean ± SD]: low-dose 20.2 ± 5.9, virtual normal-dose 28.3 ± 6.9, and normal-dose 29.5 ± 7.2). The pooled parenchymal CNR of the hepatobiliary contrast phases revealed a significant increase from the low-dose (22.8 ± 6.2) to the virtual normal-dose (33.2 ± 6.1; P < 0.0001) and normal-dose sequence (37.0 ± 9.1; P < 0.0001). In addition, there was no significant difference between the virtual normal-dose and normal-dose sequence. In the visual Turing test, on the median, the consultant radiologist reported that the sequences of the normal-dose and virtual normal-dose are consistent in findings in 100% of the examinations. Moreover, the consultants were able to identify the normal-dose series as such in a median 54.5% of the cases. CONCLUSIONS In this feasibility study in healthy Göttingen minipigs, it could be shown that GAN-based virtual contrast enhancement can be used to recreate the image impression of normal-dose imaging in terms of CNR and subjective image similarity in both dynamic and hepatobiliary contrast phases from low-dose data with an 80% reduction in gadolinium-based contrast agent dose. Before clinical implementation, further studies with pathologies are needed to validate whether pathologies are correctly represented by the network.
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Affiliation(s)
| | - Gregor Jost
- MR and CT Contrast Media Research, Bayer AG, Berlin, Germany
| | - Jens Matthias Theysohn
- From the Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen
| | - Johannes Maximilian Ludwig
- From the Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen
| | - Yan Li
- From the Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen
| | - Jens Kleesiek
- Institute of Artificial Intelligence in Medicine, University Hospital Essen, Essen
| | | | - Michael Forsting
- From the Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen
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Fernandes DA, Dal Lago EA, Oliver FA, Loureiro BMC, Martins DL, Penachim TJ, Barros RHDO, Araújo Filho JDAB, Eloy da Costa LB, da Silva ÁMO, de Ataíde EC, Boin IDFSF, Caserta NMG. Hepatobiliary phases in magnetic resonance imaging using liver-specific contrast for focal lesions in clinical practice. World J Hepatol 2022; 14:1459-1469. [PMID: 36158916 PMCID: PMC9376775 DOI: 10.4254/wjh.v14.i7.1459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 04/20/2022] [Accepted: 07/11/2022] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Challenging lesions, difficult to diagnose through non-invasive methods, constitute an important emotional burden for each patient regarding a still uncertain diagnosis (malignant x benign). In addition, from a therapeutic and prognostic point of view, delay in a definitive diagnosis can lead to worse outcomes. One of the main innovative trends currently is the use of molecular and functional methods to diagnosis. Numerous liver-specific contrast agents have been developed and studied in recent years to improve the performance of liver magnetic resonance imaging (MRI). More recently, one of the contrast agents introduced in clinical practice is gadoxetic acid (gadoxetate disodium).
AIM To demonstrate the value of the hepatobiliary phases using gadoxetic acid in MRI for the characterization of focal liver lesions (FLL) in clinical practice.
METHODS Overall, 302 Lesions were studied in 136 patients who underwent MRI exams using gadoxetic acid for the assessment of FLL. Two radiologists independently reviewed the MRI exams using four stages, and categorized them on a 6-point scale, from 0 (lesion not detected) to 5 (definitely malignant). The stages were: stage 1- images without contrast, stage 2- addition of dynamic phases after contrast (analogous to usual extracellular contrasts), stage 3- addition of hepatobiliary phase after 10 min (HBP 10’), stage 4- hepatobiliary phase after 20 min (HBP 20’) in addition to stage 2.
RESULTS The interobserver agreement was high (weighted Kappa coefficient: 0.81- 1) at all stages in the characterization of benign and malignant FLL. The diagnostic weighted accuracy (Az) was 0.80 in stage 1 and was increased to 0.90 in stage 2. Addition of the hepatobiliary phase increased Az to 0.98 in stage 3, which was also 0.98 in stage 4.
CONCLUSION The hepatobiliary sequences improve diagnostic accuracy. With growing potential in the era of precision medicine, the improvement and dissemination of the method among medical specialties can bring benefits in the management of patients with FLL that are difficult to diagnose.
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Affiliation(s)
- Daniel Alvarenga Fernandes
- Department of Radiology, School of Medical Sciences, University of Campinas- UNICAMP, Campinas 13083-888, São Paulo, Brazil
| | - Eduardo Andreazza Dal Lago
- Department of Radiology, School of Medical Sciences, University of Campinas- UNICAMP, Campinas 13083-888, São Paulo, Brazil
| | - Felipe Aguera Oliver
- Department of Radiology, Medical School, São Paulo State University- UNESP, Botucatu 18618-970, São Paulo, Brazil
| | - Bruna Melo Coelho Loureiro
- Instituto de Radiologia, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo- InRad/HC-FMUSP, São Paulo 05403-010, SP, Brazil
| | - Daniel Lahan Martins
- Department of Radiology, School of Medical Sciences, University of Campinas- UNICAMP, Campinas 13083-888, São Paulo, Brazil
| | - Thiago José Penachim
- Department of Radiology, School of Medical Sciences, University of Campinas- UNICAMP, Campinas 13083-888, São Paulo, Brazil
| | | | | | - Larissa Bastos Eloy da Costa
- Department of Pathology, School of Medical Sciences, University of Campinas - UNICAMP, Campinas 13083-888, São Paulo, Brazil
| | - Áurea Maria Oliveira da Silva
- Liver Transplant Unit, Department of Surgery, School of Medical Sciences, University of Campinas- UNICAMP, Campinas 13083-888, São Paulo, Brazil
| | - Elaine Cristina de Ataíde
- Liver Transplant Unit, Department of Surgery, School of Medical Sciences, University of Campinas- UNICAMP, Campinas 13083-888, São Paulo, Brazil
| | - Ilka de Fátima Santana Ferreira Boin
- Liver Transplant Unit, Department of Surgery, School of Medical Sciences, University of Campinas- UNICAMP, Campinas 13083-888, São Paulo, Brazil
| | - Nelson Marcio Gomes Caserta
- Department of Radiology, School of Medical Sciences, University of Campinas- UNICAMP, Campinas 13083-888, São Paulo, Brazil
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Takayama Y, Nishie A, Okamoto D, Fujita N, Asayama Y, Ushijima Y, Yoshizumi T, Yoneyama M, Ishigami K. Differentiating Liver Hemangioma from Metastatic Tumor Using T2-enhanced Spin-echo Imaging with a Time-reversed Gradient-echo Sequence in the Hepatobiliary Phase of Gadoxetic Acid-enhanced MR Imaging. Magn Reson Med Sci 2021; 21:445-457. [PMID: 33883364 PMCID: PMC9316131 DOI: 10.2463/mrms.mp.2020-0151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Purpose: To evaluate the utility of T2-enhanced spin-echo imaging using the time-reversed gradient echo sequence (T2FFE imaging) in the hepatobiliary phase (HBP) of gadoxetic acid-enhanced MRI (Gd-EOB-MRI) for differentiating hemangiomas from metastatic tumors. Methods: A total of 61 patients with 133 liver lesions, including 37 hemangiomas and 96 metastatic tumors, were scanned by Gd-EOB-MRI. Four data sets were independently analyzed by two readers: (1) 3D fat-suppressed T2-weighted imaging (FS-T2WI) alone; (2) the combination of 3D FS-T2WI and T2FFE imaging in the HBP of Gd-EOB-MRI; (3) the combination of 3D FS-T2WI, diffusion-weighted imaging (DWI) with the b-value of 1000 s/mm2 and the apparent diffusion coefficient (ADC); and (4) a dynamic study of Gd-EOB-MRI. After classifying the lesion sizes as ≤ 10 mm or > 10 mm, we conducted a receiver-operating characteristic analysis to compare diagnostic accuracies among the four data sets for differentiating hemangiomas from metastatic tumors. Results: The areas under the curves (AUCs) of the four data sets of two readers were: (1) ≤ 10 mm (0.85 and 0.91) and > 10 mm (0.88 and 0.97), (2) ≤ 10 mm (0.94 and 0.94) and > 10 mm (0.96 and 0.95), (3) ≤ 10 mm (0.90 and 0.87) and > 10 mm (0.89 and 0.95), and (4) ≤ 10 mm (0.62 and 0.67) and > 10 mm (0.76 and 0.71), respectively. Data sets (2) and (3) showed no significant differences in AUCs, but both showed significantly higher AUCs compared to that of (4) regardless of the lesion size (P < 0.05). Conclusion: The combination of 3D FS-T2WI and T2FFE imaging in the HBP of Gd-EOB-MRI achieved an accuracy equivalent to that of the combination of 3D FS-T2WI, DWI, and ADC and might be helpful in differentiating hemangiomas from metastatic tumors.
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Affiliation(s)
- Yukihisa Takayama
- Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University
| | - Akihiro Nishie
- Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University
| | - Daisuke Okamoto
- Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University
| | - Nobuhiro Fujita
- Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University
| | - Yoshiki Asayama
- Department of Advanced Imaging and Interventional Radiology, Graduate School of Medical Sciences, Kyushu University
| | - Yasuhiro Ushijima
- Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University
| | - Tomoharu Yoshizumi
- Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University
| | | | - Kousei Ishigami
- Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University
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Vernuccio F, Gagliano DS, Cannella R, Ba-Ssalamah A, Tang A, Brancatelli G. Spectrum of liver lesions hyperintense on hepatobiliary phase: an approach by clinical setting. Insights Imaging 2021; 12:8. [PMID: 33432491 PMCID: PMC7801550 DOI: 10.1186/s13244-020-00928-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 10/14/2020] [Indexed: 12/13/2022] Open
Abstract
Hepatobiliary MRI contrast agents are increasingly being used for liver imaging. In clinical practice, most focal liver lesions do not uptake hepatobiliary contrast agents. Less commonly, hepatic lesions may show variable signal characteristics on hepatobiliary phase. This pictorial essay reviews a broad spectrum of benign and malignant focal hepatic observations that may show hyperintensity on hepatobiliary phase in various clinical settings. In non-cirrhotic patients, focal hepatic observations that show hyperintensity in the hepatobiliary phase are usually benign and typically include focal nodular hyperplasia. In patients with primary or secondary vascular disorders, focal nodular hyperplasia-like lesions arise as a local hyperplastic response to vascular alterations and tend to be iso- or hyperintense in the hepatobiliary phase. In oncologic patients, metastases and cholangiocarcinoma are hypointense lesions in the hepatobiliary phase; however, occasionally they may show a diffuse, central and inhomogeneous hepatobiliary paradoxical uptake with peripheral rim hypointensity. Post-chemotherapy focal nodular hyperplasia-like lesions may be tricky, and their typical hyperintense rim in the hepatobiliary phase is very helpful for the differential diagnosis with metastases. In cirrhotic patients, hepatocellular carcinoma may occasionally appear hyperintense on hepatobiliary phase.
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Affiliation(s)
- Federica Vernuccio
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties (PROMISE), University of Palermo, Via del Vespro, 129, 90127, Palermo, Italy. .,University Paris Diderot, Sorbonne Paris Cité, Paris, France. .,I.R.C.C.S. Centro Neurolesi Bonino Pulejo, Contrada Casazza, SS113, 98124, Messina, Italy. .,Department of Biomedicine, Neuroscience and Advanced Diagnostics (Bi.N.D.), University Hospital of Palermo, Via del Vespro 129, 90127, Palermo, Italy.
| | - Domenico Salvatore Gagliano
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (Bi.N.D.), University Hospital of Palermo, Via del Vespro 129, 90127, Palermo, Italy
| | - Roberto Cannella
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties (PROMISE), University of Palermo, Via del Vespro, 129, 90127, Palermo, Italy.,Department of Biomedicine, Neuroscience and Advanced Diagnostics (Bi.N.D.), University Hospital of Palermo, Via del Vespro 129, 90127, Palermo, Italy
| | - Ahmed Ba-Ssalamah
- Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, General Hospital of Vienna (AKH), Waehringer Guertel 18-20, 1090, Vienna, Austria
| | - An Tang
- Department of Radiology, Centre Hospitalier de l'Université de Montréal (CHUM), Montreal, QC, Canada.,Centre de Recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, QC, Canada.,Department of Radiology, Radio-Oncology and Nuclear Medicine, University of Montreal, Montreal, Canada
| | - Giuseppe Brancatelli
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (Bi.N.D.), University Hospital of Palermo, Via del Vespro 129, 90127, Palermo, Italy
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Ghorra C, Pommier R, Piveteau A, Rubbia-Brandt L, Vilgrain V, Terraz S, Ronot M. The diagnostic performance of a simulated "short" gadoxetic acid-enhanced MRI protocol is similar to that of a conventional protocol for the detection of colorectal liver metastases. Eur Radiol 2020; 31:2451-2460. [PMID: 33025173 DOI: 10.1007/s00330-020-07344-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 08/28/2020] [Accepted: 09/23/2020] [Indexed: 12/11/2022]
Abstract
OBJECTIVES To compare the performance of standard and simulated short gadoxetic acid-enhanced MRI protocols for the detection of colorectal liver metastases (CRLM). METHODS From 2008 to 2017, 67 patients (44 men (66%); mean age 65 ± 11 years old) who underwent gadoxetic acid-enhanced MRI during the initial work-up for colorectal cancer were included. Exams were independently reviewed by two readers blinded to clinical data in two reading sessions: (1) all acquired sequences (standard "long" protocol) and (2) only T2-weighted, diffusion-weighted, and hepatobiliary phase images (simulated "short" protocol). Readers characterized detected lesions using a 5-point scale (1-certainly benign to 5-certainly malignant). A lesion was considered a CRLM when the score was ≥ 3. The reference standard was histopathology or 12-month imaging follow-up. Chi-square, Student's t, and McNemar tests were used for comparisons. RESULTS A total of 486 lesions including 331 metastases (68%) were analyzed. The metastasis detection rate was 86.1% (95% CI 82-89.4)-86.7% (82.6-90) and 85.8% (81.6-89.2)-87% (82.9-90.2) with the short and long protocols, respectively (p > 0.99). Among detected lesions, 92.1% (89.1-94.4)-94.8% (92.2-96.6) and 84.6% (80.8-87.7)-88.8% (85.4-91.5) were correctly classified with the short and long protocols, respectively (p = 0.13 and p = 0.10). The results remained unchanged when lesions scored ≥ 4 were considered as CRLM. CONCLUSION The diagnostic performance of a simulated short gadoxetic enhanced-MR protocol including T2-weighted, diffusion-weighted, and hepatobiliary phase appears similar to that of a standard long protocol including dynamic phase images. Since this protocol shortens the duration of MR examination, it could facilitate the evaluation of patients with colorectal liver metastases. KEY POINTS • The detection rate of colorectal metastases with a simulated, short, MRI protocol was similar to that of a standard protocol. • The performance of both protocols for the differentiation of metastases and benign lesions appears to be similar. • A short MR imaging protocol could facilitate the evaluation of patients with colorectal liver metastases.
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Affiliation(s)
- Camille Ghorra
- Department of Radiology, University Hospitals Paris Nord Val de Seine, Beaujon, Clichy, Hauts-de-Seine, France
| | - Romain Pommier
- Department of Radiology, University Hospitals Paris Nord Val de Seine, Beaujon, Clichy, Hauts-de-Seine, France
| | - Arthur Piveteau
- Department of Radiology, University Hospitals of Geneva - HUG, Geneva, Switzerland
| | - Laura Rubbia-Brandt
- Department of Pathology, University Hospitals of Geneva - HUG, Geneva, Switzerland
| | - Valérie Vilgrain
- Department of Radiology, University Hospitals Paris Nord Val de Seine, Beaujon, Clichy, Hauts-de-Seine, France.,Université de Paris, Paris, France.,INSERM U1149, CRI, Paris, France
| | - Sylvain Terraz
- Department of Radiology, University Hospitals of Geneva - HUG, Geneva, Switzerland
| | - Maxime Ronot
- Department of Radiology, University Hospitals Paris Nord Val de Seine, Beaujon, Clichy, Hauts-de-Seine, France. .,Université de Paris, Paris, France. .,INSERM U1149, CRI, Paris, France.
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Optimization of timing of hepatocellular phase imaging after gadoxetate disodium injection for evaluation of patients with neuroendocrine tumor. Abdom Radiol (NY) 2020; 45:2358-2369. [PMID: 32270259 DOI: 10.1007/s00261-020-02515-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
PURPOSE Metastatic gastroenteropancreatic neuroendocrine neoplasms (mGEP-NEN) are indolent malignancies which undergo frequent imaging follow-up. Hepatocellular phase (HCP) MR with hepatocellular-specific contrast agent is widely used to evaluate mGEP-NEN liver metastases but is commonly performed after a 20-min delay which prolongs scan time. The purpose of this study was to evaluate if HCP MR at 15 min offers comparable performance to 20-min delay for patients with mGEP-NEN undergoing routine imaging surveillance. MATERIALS AND METHODS In this IRB-approved retrospective study, we evaluated 52 patients with mGEP-NEN who were imaged for routine surveillance with gadoxetate disodium (Eovist®)-enhanced MR including 15- and 20-min delayed HCP. Two readers (R1, R2), blinded to HCP timing, independently reviewed each set of images in random order at least 1 month apart. Readers assessed presence and conspicuity of metastases, and subjective image quality using 5-point scales. Readers quantified the number of metastases and diameter of the largest lesion. Statistical analysis was performed to determine individual-reader and inter-reader differences for qualitative and quantitative data. RESULTS No differences were observed for subjective image quality (R1 p = 0.86, R2 p = 0.17) or lesion conspicuity (R1 p = 0.56, R2 p = 0.74) at 15 min and 20 min for either reader. Individual-reader concordance correlation coefficient between 15 and 20 min was high for number of metastases detected (R1 = 0.9842, R2 = 0.9579) and diameter of largest metastasis (R1 = 0.9629, R2 = 0.8859). CONCLUSION HCP imaging at 15 min provides similar diagnostic yield to standard 20-min delay, which may help reduce the scan time and costs, and improve throughput and patient satisfaction.
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Fahlenkamp UL, Engel G, Adams LC, Böker SM, Huynh Anh M, Wagner M, Hamm B, Makowski MR. Improved visualisation of hepatic metastases in gadoxetate disodium-enhanced MRI: Potential of contrast-optimised (phase-sensitive) inversion recovery imaging. PLoS One 2019; 14:e0213408. [PMID: 30840710 PMCID: PMC6402670 DOI: 10.1371/journal.pone.0213408] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 02/20/2019] [Indexed: 11/19/2022] Open
Abstract
Background Detection of metastases can have a significant impact on therapy. Nevertheless, even in gadoxetate disodium-enhanced MR scans, very small hepatic metastases may be difficult to see. Purpose To investigate the potential of a contrast-optimised (phase-sensitive) inversion recovery MR sequence in gadoxetate disodium-enhanced scans for detection of hepatic metastases. Materials and methods With institutional review board approval and after written informed consent, 40 patients (18 male, 22 female) with suspected or known hepatic metastases were examined on a 1.5 T MR system. A T1-weighted gradient-echo volumetric-interpolated-breath-hold (VIBE) sequence was acquired as part of the standard imaging protocol 20 minutes after administration of gadoxetate disodium. Additionally, an IR sequence was acquired with an inversion time to suppress native signal from metastases. Overall image quality and delineation of lesions were assessed on VIBE as well as on magnitude-reconstructed (MAG) and phase-sensitive IR (PSIR) sequences. Lesion-to-liver contrast (LLC) was compared between VIBE and MAG images. Results Overall image quality was high in both VIBE and MAG IR sequences (VIBE 4.275; MAG 4.313), yet significantly lower in PSIR (4.038). Subjective delineation of lesions was higher on MAG and PSIR images compared to VIBE in all size groups with an overall statistically significant difference for VIBE vs. MAG vs. PSIR (p < .001) in the variance analysis. Mean LLC was 0.35±0.01 for VIBE sequences, and 0.73±0.01 for MAG. Conclusion Contrast-optimised PSIR seems to improve imaging characteristics of hepatic metastases in gadoxetate disodium-enhanced scans compared to T1 gradient-echo VIBE sequences.
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Affiliation(s)
- Ute Lina Fahlenkamp
- Department of Radiology, Charité—Universitätsmedizin Berlin, Berlin, Germany
- * E-mail:
| | - Günther Engel
- Department of Radiology, Charité—Universitätsmedizin Berlin, Berlin, Germany
| | | | - Sarah Maria Böker
- Department of Radiology, Charité—Universitätsmedizin Berlin, Berlin, Germany
| | - Minh Huynh Anh
- Department of Radiology, Charité—Universitätsmedizin Berlin, Berlin, Germany
| | - Moritz Wagner
- Department of Radiology, Charité—Universitätsmedizin Berlin, Berlin, Germany
| | - Bernd Hamm
- Department of Radiology, Charité—Universitätsmedizin Berlin, Berlin, Germany
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Rao SX, Wang J, Wang J, Jiang XQ, Long LL, Li ZP, Li ZL, Shen W, Zhao XM, Hu DY, Zhang HM, Zhang L, Huan Y, Liang CH, Song B, Zeng MS. Chinese consensus on the clinical application of hepatobiliary magnetic resonance imaging contrast agent: Gadoxetic acid disodium. J Dig Dis 2019; 20:54-61. [PMID: 30693659 DOI: 10.1111/1751-2980.12707] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Accepted: 01/27/2019] [Indexed: 02/05/2023]
Affiliation(s)
- Sheng Xiang Rao
- Department of Radiology, Zhongshan Hospital, Fudan University, and Shanghai Institute of Medical Imaging, Shanghai, China
| | - Jin Wang
- Department of Radiology, The Third Affiliated Hospital, Sun Yat-Sen University, Guangzhou, Guangdong Province, China
| | - Jian Wang
- Department of Radiology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - Xin Qing Jiang
- Department of Radiology, Guangzhou First People's Hospital, Guangzhou, Guangdong Province, China
| | - Li Ling Long
- Department of Radiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi Zhuang Autonomous Region, China
| | - Zi Ping Li
- Department of Radiology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, Guangdong Province, China
| | - Zhen Lin Li
- Department of Radiology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, China
| | - Wen Shen
- Department of Radiology, Tianjin First Central Hospital, Tianjin, China
| | - Xin Ming Zhao
- Department of Diagnostic Imaging, Chinese Academy of Medical Sciences Cancer Hospital, Beijing, China
| | - Dao Yu Hu
- Department of Radiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Hui Mao Zhang
- Department of Radiology, The First Hospital of Jilin University, Changchun, Jilin Province, China
| | - Lin Zhang
- Department of Radiology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - Yi Huan
- Department of Radiology, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Chang Hong Liang
- Department of Radiology, Guangdong Provincial People's Hospital, Guanggong Academy of Medical Sciences, Guangzhou, Guangdong Province, China
| | - Bin Song
- Department of Radiology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, China
| | - Meng Su Zeng
- Department of Radiology, Zhongshan Hospital, Fudan University, and Shanghai Institute of Medical Imaging, Shanghai, China
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10
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Jha P, Yeh BM, Zagoria R, Collisson E, Wang ZJ. The Role of MR Imaging in Pancreatic Cancer. Magn Reson Imaging Clin N Am 2018; 26:363-373. [DOI: 10.1016/j.mric.2018.03.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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11
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Lo GC, Kambadakone A. MR Imaging of Pancreatic Neuroendocrine Tumors. Magn Reson Imaging Clin N Am 2018; 26:391-403. [DOI: 10.1016/j.mric.2018.03.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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12
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Ko Y, Kim J, Park JKH, Kim H, Cho JY, Kang SB, Ahn S, Lee KJ, Lee KH. Limited detection of small (≤ 10 mm) colorectal liver metastasis at preoperative CT in patients undergoing liver resection. PLoS One 2017; 12:e0189797. [PMID: 29244853 PMCID: PMC5731738 DOI: 10.1371/journal.pone.0189797] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2017] [Accepted: 12/02/2017] [Indexed: 12/17/2022] Open
Abstract
OBJECTIVE To retrospectively determine the sensitivity of preoperative CT in the detection of small (≤ 10 mm) colorectal liver metastasis (CRLM) nodules in patients undergoing liver resection. METHODS The institutional review board approved the study and waived informed consent. We included 461 pathologically confirmed CRLM nodules in 211 patients (including 71 women; mean age, 66.4 years) who underwent 229 liver resections following abdominal CT. Prior to 163 resections, gadoxetic acid-enhanced liver MR imaging was also performed. Nodules were matched between pathology reports and prospective CT reports following a predefined algorithm. Per-nodule sensitivity of CT was calculated by nodule-size category. Generalized estimating equations were used to adjust for within-case correlation. RESULTS Fourteen nodule sizes were missing in the pathology report. Nodules of 1-5 mm and 6-10 mm accounted for 8.1% (n = 36) and 23.5% (n = 105) of the remaining 447 nodules, and the number of nodules gradually decreased as nodule size increased beyond 10 mm. The overall sensitivity of CT was 81.2% (95% confidence interval, 77.1%, 85.2%; 365/461). The sensitivity was 8% (0%, 17%; 3/36), 55% (45%, 65%; 59/105), 91%, 95%, and 100% for nodules of 1-5 mm, 6-10 mm, 11-15 mm, 16-20 mm, and >20 mm, respectively. The nodule-size distribution was similar between resections undergoing gadoxetic acid-enhanced MR imaging and those not undergoing the MR imaging. CONCLUSION CT has limited sensitivity for nodules of ≤ 10 mm and particularly of ≤ 5 mm.
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Affiliation(s)
- Yousun Ko
- Department of Radiology, Seoul National University Bundang Hospital, Gyeonggi-do, Korea
- Program in Biomedical Radiation Sciences, Department of Transdisciplinary Studies, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, Korea
| | - Jihang Kim
- Department of Radiology, Seoul National University Bundang Hospital, Gyeonggi-do, Korea
| | | | - Haeryoung Kim
- Department of Pathology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
| | - Jai Young Cho
- Department of Surgery, Seoul National University Bundang Hospital, Gyeonggi-do, Korea
| | - Sung-Bum Kang
- Department of Surgery, Seoul National University Bundang Hospital, Gyeonggi-do, Korea
| | - Soyeon Ahn
- Division of Statistics, Medical Research Collaborating Center, Seoul National University Bundang Hospital, Gyeonggi-do, Korea
| | - Kyong Joon Lee
- Department of Radiology, Seoul National University Bundang Hospital, Gyeonggi-do, Korea
| | - Kyoung Ho Lee
- Department of Radiology, Seoul National University Bundang Hospital, Gyeonggi-do, Korea
- Program in Biomedical Radiation Sciences, Department of Transdisciplinary Studies, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, Korea
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13
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Hope TA, Aslam R, Weinstein S, Yeh BM, Corvera CU, Monto A, Yee J. Change in Liver Imaging Reporting and Data System Characterization of Focal Liver Lesions Using Gadoxetate Disodium Magnetic Resonance Imaging Compared With Contrast-Enhanced Computed Tomography. J Comput Assist Tomogr 2017; 41:376-381. [PMID: 27801693 PMCID: PMC5411341 DOI: 10.1097/rct.0000000000000536] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
PURPOSE The aim of this study was to determine whether gadoxetate-enhanced magnetic resonance imaging (MRI) improves lesion characterization in patients at risk for hepatocellular carcinoma compared with computed tomography (CT). MATERIALS AND METHODS Forty-nine patients with indeterminate lesions found at contrast-enhanced CT were prospectively enrolled and imaged using gadoxetate-enhanced hepatobiliary phase (HBP) MRI within 30 days of their initial CT. Three readers graded each lesion at CT and MRI using the Liver Imaging Reporting and Data System (LI-RADS) v2014 major criteria and HBP characterization as an ancillary feature. Patients were followed for an average of 1.8 years to document growth or stability of each lesion. RESULTS The Liver Imaging Reporting and Data System categorization changed for 71% (52/73) of lesions based on HBP MRI compared with CT, with 30% (22/73) of lesions upgraded and 41% (30/73) of lesions downgraded. There was almost perfect agreement between readers for arterial phase hyperintensity and HBP hypointensity, with lower interreader agreement for washout and capsule appearance. On the basis of composite clinical follow-up, lesions that were subsequently classified as hepatocellular carcinoma were assigned a higher LI-RADS category on HBP MRI when compared with CT. CONCLUSIONS For patients with indeterminate lesions seen on contrast-enhanced CT, HBP MRI using gadoxetate improves lesion characterization when using LI-RADS v2014 criteria.
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Affiliation(s)
- Thomas A. Hope
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, CA
- Department of Radiology, Veterans Affairs Medical Center, University of California, San Francisco, San Francisco, CA
| | - Rizwan Aslam
- Department of Radiology, MD Anderson Cancer Center, Houston, TX
| | - Stefanie Weinstein
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, CA
- Department of Radiology, Veterans Affairs Medical Center, University of California, San Francisco, San Francisco, CA
| | - Benjamin M. Yeh
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, CA
- Department of Radiology, Veterans Affairs Medical Center, University of California, San Francisco, San Francisco, CA
| | - Carlos U. Corvera
- Division of Surgical Oncology, Department of Surgery, University of California, San Francisco
| | - Alex Monto
- Division of Gastroenterology and Hepatology, Department of Medicine, San Francisco Veterans Affairs Medical Center, San Francisco, CA
| | - Judy Yee
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, CA
- Department of Radiology, Veterans Affairs Medical Center, University of California, San Francisco, San Francisco, CA
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14
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Jeon I, Cho ES, Kim JH, Kim DJ, Yu JS, Chung JJ. Feasibility of 10-Minute Delayed Hepatocyte Phase Imaging Using a 30° Flip Angle in Gd-EOB-DTPA-Enhanced Liver MRI for the Detection of Hepatocellular Carcinoma in Patients with Chronic Hepatitis or Cirrhosis. PLoS One 2016; 11:e0167701. [PMID: 27936106 PMCID: PMC5147964 DOI: 10.1371/journal.pone.0167701] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Accepted: 11/18/2016] [Indexed: 02/06/2023] Open
Abstract
Objectives To compare 10-minute (min) delayed hepatocyte phase imaging (HPI) using a 30° flip angle (FA) (10m-FA30) and 20-min delayed HPI using a 10° FA (20m-FA10) or 30° FA (20m-FA30) in Gd-EOB-DTPA-enhanced MRI in patients with chronic hepatitis or cirrhosis, in terms of lesion-to-liver contrast-to-noise ratio (CNR) for hepatocellular carcinoma (HCC) and detection sensitivity for focal hepatic lesions (FHLs). Materials and Methods One hundred and four patients with 168 HCCs and 55 benign FHLs who underwent Gd-EOB-DTPA-enhanced MRI with 10m-FA30, 20m-FA10, and 20m-FA30 were enrolled. Patients were divided into two groups according to the Child-Pugh classification: group A with chronic hepatitis or Child-Pugh A cirrhosis and group B with Child-Pugh B or C cirrhosis. Lesion-to-liver CNR for HCCs was compared between 10m-FA30 and 20m-FA10 or 20m-FA30 for each group. The presence of FHLs was evaluated using a four-point scale by two independent reviewers, and the detection sensitivity was analyzed. Results In group A, the CNR for HCCs (n = 86) on 10m-FA30 (165.8 ± 99.7) was significantly higher than that on 20m-FA10 (113.4 ± 71.4) and lower than that of 20m-FA30 (210.2 ± 129.3). However, there was no significant difference in the sensitivity of FHL detection between 10m-FA30 (mean 95.0% for two reviewers) and 20m-FA10 (94.7%) or 20m-FA30 (94.7%). In group B, the CNR (54.0 ± 36.4) for HCCs (n = 57) and the sensitivity (94.2%) of FHL detection for 10m-FA30 were significantly higher than those for 20m-FA10 (41.8 ± 36.4 and 80.8%, respectively) and were not different from those for 20m-FA30 (62.7 ± 44.4 and 93.3%, respectively). Conclusion The diagnostic performance of 10m-FA30 was similar to or higher than 20m-FA10 or 20m-FA30 in both groups A and B. This finding indicates that 10m-FA30 could replace 20-min delayed HPI regardless of patient liver function and reduce the delay time by 10 minutes.
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Affiliation(s)
- Inhwan Jeon
- Department of Radiology, Yonsei University College of Medicine, Gangnam Severance Hospital, Seoul, Korea
| | - Eun-Suk Cho
- Department of Radiology, Yonsei University College of Medicine, Gangnam Severance Hospital, Seoul, Korea
- * E-mail:
| | - Joo Hee Kim
- Department of Radiology, Yonsei University College of Medicine, Gangnam Severance Hospital, Seoul, Korea
| | - Dae Jung Kim
- Department of Radiology, CHA University, CHA Bundang Medical Center, Seongnam-si, Korea
| | - Jeong-Sik Yu
- Department of Radiology, Yonsei University College of Medicine, Gangnam Severance Hospital, Seoul, Korea
| | - Jae-Joon Chung
- Department of Radiology, Yonsei University College of Medicine, Gangnam Severance Hospital, Seoul, Korea
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Qu J, Han S, Zhang H, Liu H, Wang Z, Kamel IR, Berthold K, Dominik NM, Zhang J, Zhang S, Dong Y, Jiang L, Liu C, Li H. Arterial Phase with CAIPIRINHA-Dixon-TWIST (CDT)-Volume-Interpolated Breath-Hold Examination (VIBE) in Detecting Hepatic Metastases. Transl Oncol 2016; 10:46-53. [PMID: 27940372 PMCID: PMC5154962 DOI: 10.1016/j.tranon.2016.11.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 11/14/2016] [Accepted: 11/14/2016] [Indexed: 12/13/2022] Open
Abstract
PURPOSE: To evaluate lesion enhancement performance of Multi-Arterial CAIPIRINHA-Dixon-TWIST–Volume-Interpolated Breath-Hold Examination (MA-CDT-VIBE) for the detection of hepatic metastases. MATERIALS AND METHODS: Thirty-one patients with suspicious hepatic metastases were enrolled in this retrospective study. Two independent radiologists scored visualization of each lesion on a scale of 1 (poor visualization) to 11 (excellent visualization) on 11 sets of images. These included 6 hepatic arterial sub-phases acquired in one breath-hold, 1 series of the mean of 6 hepatic arterial sub-phases, 3 subtracted arterial sub-phases, and 1 portal venous phase. The phases with good (score 8–10) and excellent (score 11) lesion visualization were identified, and the number of lesions seen on each of these phases was compared to the number of lesions that was seen best on the equivalent-to-conventional single arterial phase as well as to those that were see best on the mean of 6 hepatic arterial sub-phases. Inter-reader agreement was also calculated. RESULTS: The MA-CDT-VIBE was successfully acquired in 25 patients with hypervascular metastases (96 lesions) and 6 patients with hypovascular metastases (13 lesions). In case of hypervascular metastases, the 6th/6 arterial sub-phase had excellent lesion visualization (sore of 11) in 56 and 44 lesions for the 2 readers, respectively. Good lesion visualization (score of 8-10) was recorded in 5th/6 arterial subphases, in 81 and 67 lesions for the 2 readers, respectively. In case of hypovascular metastases, the portal venous phase had excellent lesion visualization (sore of 11) in all 13 lesions for the 2 readers. Good lesion visualization (score of 8–10) was recorded in 12 and 13 lesions on the 5th/6 and 6th/6 arterial subphases, respectively. More hypervascular lesions scored good (score of 8–10) and excellent (score of 11) on the 5th/6 and 6th/6 phases of MA-CDT-VIBE compared with the equivalent-to-conventional single arterial phase (3rd/6) and the set with mean of 6 hepatic arterial sub-phases. The results were statistically significant (t test, P < .0001). Inter-reader agreement was good for hypervascular lesions (kappa = 0.627, P < .0001) and excellent for hypovascular lesions (kappa = 1.0, P < .0001), respectively. CONCLUSIONS: The MA-CDT-VIBE improves lesion conspicuity by providing a wide observation window for hypervascular lesions. For hypovascular lesions, the advantage of multiple arterial sub-phases over the portal venous phase is not apparent.
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Affiliation(s)
- Jinrong Qu
- Department of Radiology, the Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China, 450008.
| | - Shuai Han
- Department of Radiology, the Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China, 450008
| | - Hongkai Zhang
- Department of Radiology, the Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China, 450008
| | - Hui Liu
- MR Collaboration, Siemens Healthcare, Shanghai, China, 201318
| | - Zhaoqi Wang
- Department of Radiology, the Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China, 450008
| | - Ihab R Kamel
- Department of Radiology, Johns Hopkins University School of Medicine, Baltimore, MD, USA, 21205-2196
| | - Kiefer Berthold
- MR Pre-development, Siemens Healthcare, Erlangen, Germany, 91052
| | | | - Jianwei Zhang
- Department of Radiology, the Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China, 450008
| | - Shouning Zhang
- Department of Radiology, the Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China, 450008
| | - Yafeng Dong
- Department of Radiology, the Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China, 450008
| | - Lina Jiang
- Department of Radiology, the Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China, 450008
| | - Cuicui Liu
- Department of Radiology, the Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China, 450008
| | - Hailiang Li
- Department of Radiology, the Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China, 450008.
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16
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Vilgrain V, Esvan M, Ronot M, Caumont-Prim A, Aubé C, Chatellier G. A meta-analysis of diffusion-weighted and gadoxetic acid-enhanced MR imaging for the detection of liver metastases. Eur Radiol 2016; 26:4595-4615. [PMID: 26883327 DOI: 10.1007/s00330-016-4250-5] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 01/22/2016] [Accepted: 01/25/2016] [Indexed: 12/11/2022]
Abstract
OBJECTIVES To obtain the diagnostic performance of diffusion-weighted (DW) and gadoxetic-enhanced magnetic resonance (MR) imaging in the detection of liver metastases. METHODS A comprehensive search (EMBASE, PubMed, Cochrane) was performed to identify relevant articles up to June 2015. Inclusion criteria were: liver metastases, DW-MR imaging and/or gadoxetic acid-enhanced MR imaging, and per-lesion statistics. The reference standard was histopathology, intraoperative observation and/or follow-up. Sources of bias were assessed using the QUADAS-2 tool. A linear mixed-effect regression model was used to obtain sensitivity estimates. RESULTS Thirty-nine articles were included (1,989 patients, 3,854 metastases). Sensitivity estimates for DW-MR imaging, gadoxetic acid-enhanced MR imaging and the combined sequence for detecting liver metastases on a per-lesion basis was 87.1 %, 90.6 % and 95.5 %, respectively. Sensitivity estimates by gadoxetic acid-enhanced MR imaging and the combined sequence were significantly better than DW-MR imaging (p = 0.0001 and p < 0.0001, respectively), and the combined MR sequence was significantly more sensitive than gadoxetic acid-enhanced MR imaging (p < 0.0001). Similar results were observed in articles that compared the three techniques simultaneously, with only colorectal liver metastases and in liver metastases smaller than 1 cm. CONCLUSIONS In patients with liver metastases, combined DW-MR and gadoxetic acid-enhanced MR imaging has the highest sensitivity for detecting liver metastases on a per-lesion basis. KEY POINTS • DW-MRI is less sensitive than gadoxetic acid-enhanced MRI for detecting liver metastases • DW-MRI and gadoxetic acid-enhanced MRI is the best combination • Same results are observed in colorectal liver metastases • Same results are observed in liver metastases smaller than 1 cm • Same results are observed when histopathology alone is the reference standard.
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Affiliation(s)
- Valérie Vilgrain
- Department of Radiology, Assistance Publique-Hôpitaux de Paris, University Hospitals Paris Nord Val de Seine, Beaujon, Clichy, Hauts-de-Seine, France. .,University Paris Diderot, Sorbonne Paris Cité, Paris, France. .,INSERM U1149, Centre de Recherche Biomédicale Bichat-Beaujon, CRB3, Paris, France.
| | - Maxime Esvan
- Hôpital européen Georges-Pompidou, Unité d'Épidémiologie et de Recherche Clinique, 75015, Paris, France.,INSERM, Centre d'Investigation Clinique 1418, module Épidémiologie Clinique, 75015, Paris, France
| | - Maxime Ronot
- Department of Radiology, Assistance Publique-Hôpitaux de Paris, University Hospitals Paris Nord Val de Seine, Beaujon, Clichy, Hauts-de-Seine, France.,University Paris Diderot, Sorbonne Paris Cité, Paris, France.,INSERM U1149, Centre de Recherche Biomédicale Bichat-Beaujon, CRB3, Paris, France
| | - Aurore Caumont-Prim
- Hôpital européen Georges-Pompidou, Unité d'Épidémiologie et de Recherche Clinique, 75015, Paris, France.,INSERM, Centre d'Investigation Clinique 1418, module Épidémiologie Clinique, 75015, Paris, France
| | - Christophe Aubé
- Department of Radiology, CHU d'Angers, Angers, France.,Laboratoire HIFIH, LUNAM, Université d'Angers, Angers, France
| | - Gilles Chatellier
- Hôpital européen Georges-Pompidou, Unité d'Épidémiologie et de Recherche Clinique, 75015, Paris, France.,INSERM, Centre d'Investigation Clinique 1418, module Épidémiologie Clinique, 75015, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, Faculté de Médecine, 75006, Paris, France
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17
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MOTOSUGI U, BANNAS P, HERNANDO D, SALMANI RAHIMI M, HOLMES JH, REEDER SB. Intraindividual Crossover Comparison of Gadoxetic Acid Dose for Liver MRI in Normal Volunteers. Magn Reson Med Sci 2016; 15:60-72. [DOI: 10.2463/mrms.2015-0005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- Utaroh MOTOSUGI
- Department of Radiology, University of Wisconsin
- Department of Radiology, University of Yamanashi
| | - Peter BANNAS
- Department of Radiology, University of Wisconsin
- Department of Radiology, University Hospital Hamburg-Eppendorf
| | | | | | | | - Scott B. REEDER
- Department of Radiology, University of Wisconsin
- Department of Biomedical Engineering, University of Wisconsin
- Department of Medical Physics, University of Wisconsin
- Department of Medicine, University of Wisconsin
- Department of Emergency Medicine, University of Wisconsin
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18
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Motosugi U, Bannas P, Bookwalter CA, Sano K, Reeder SB. An Investigation of Transient Severe Motion Related to Gadoxetic Acid-enhanced MR Imaging. Radiology 2015; 279:93-102. [PMID: 26473642 DOI: 10.1148/radiol.2015150642] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
PURPOSE To investigate the cause of imaging artifacts observed during gadoxetic acid-enhanced arterial phase imaging of the liver. MATERIALS AND METHODS This HIPAA-compliant study was approved by the institutional review board. Data were collected prospectively at two sites (site A, United States; site B, Japan) from patients undergoing contrast material-enhanced MR imaging with gadoxetic acid (site A, n = 154, dose = 0.05 mmol/kg; site B, n = 130, 0.025 mmol/kg) or gadobenate dimeglumine (only site A, n = 1666) from January 2014 to September 2014 at site A and from November 2014 to January 2015 at site B. Detailed comparisons between the two agents were made in the patients with dynamic liver acquisitions (n = 372) and age-, sex-, and baseline oxygen saturation (Spo2)-matched pairs (n = 130) at site A. Acquired data included self-reported dyspnea after contrast agent injection, Spo2, and breath-hold fidelity monitored with respiratory bellows. RESULTS Self-reported dyspnea was more frequent with gadoxetic acid than with gadobenate dimeglumine (site A, 6.5% [10 of 154] vs 0.1% [two of 1666], P < .001; site B, 1.5% [two of 130]). In the matched-pair comparison, gadoxetic acid, as compared with gadobenate dimeglumine, had higher breath-hold failure rates (site A, 34.6% [45 of 130] vs 11.7% [15 of 130], P < .0001; site B, 16.2% [21 of 130]) and more severe artifacts during arterial phase imaging (site A, 7.7% [10 of 130] vs 0% [none of 130], P < .001; site B, 2.3% [three of 130]). Severe imaging artifacts in patients who received gadoxetic acid were significantly associated with male sex (P = .023), body mass index (P = .021), and breath-hold failure (P < .001) but not with dyspnea or Spo2 decrease. CONCLUSION Severe motion-related artifacts in the arterial phase of gadoxetic acid-enhanced liver MR imaging are associated with breath-hold failure but not with subjective feelings of dyspnea or a substantial decrease in blood Spo2. Subjective feelings of dyspnea are not necessarily associated with imaging artifacts. The phenomenon, albeit at a lower rate, was confirmed at a second site in Japan.
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Affiliation(s)
- Utaroh Motosugi
- From the Departments of Radiology (U.M., P.B., C.A.B., S.B.R.), Medical Physics (S.B.R.), Biomedical Engineering (S.B.R.), Medicine (S.B.R.), and Emergency Medicine (S.B.R.), University of Wisconsin, 600 Highland Ave, Madison, WI 53792-3252; Department of Radiology, University of Yamanashi, Yamanashi, Japan (U.M., K.S.); and Department of Radiology, University Hospital Hamburg-Eppendorf, Hamburg, Germany (P.B.)
| | - Peter Bannas
- From the Departments of Radiology (U.M., P.B., C.A.B., S.B.R.), Medical Physics (S.B.R.), Biomedical Engineering (S.B.R.), Medicine (S.B.R.), and Emergency Medicine (S.B.R.), University of Wisconsin, 600 Highland Ave, Madison, WI 53792-3252; Department of Radiology, University of Yamanashi, Yamanashi, Japan (U.M., K.S.); and Department of Radiology, University Hospital Hamburg-Eppendorf, Hamburg, Germany (P.B.)
| | - Candice A Bookwalter
- From the Departments of Radiology (U.M., P.B., C.A.B., S.B.R.), Medical Physics (S.B.R.), Biomedical Engineering (S.B.R.), Medicine (S.B.R.), and Emergency Medicine (S.B.R.), University of Wisconsin, 600 Highland Ave, Madison, WI 53792-3252; Department of Radiology, University of Yamanashi, Yamanashi, Japan (U.M., K.S.); and Department of Radiology, University Hospital Hamburg-Eppendorf, Hamburg, Germany (P.B.)
| | - Katsuhiro Sano
- From the Departments of Radiology (U.M., P.B., C.A.B., S.B.R.), Medical Physics (S.B.R.), Biomedical Engineering (S.B.R.), Medicine (S.B.R.), and Emergency Medicine (S.B.R.), University of Wisconsin, 600 Highland Ave, Madison, WI 53792-3252; Department of Radiology, University of Yamanashi, Yamanashi, Japan (U.M., K.S.); and Department of Radiology, University Hospital Hamburg-Eppendorf, Hamburg, Germany (P.B.)
| | - Scott B Reeder
- From the Departments of Radiology (U.M., P.B., C.A.B., S.B.R.), Medical Physics (S.B.R.), Biomedical Engineering (S.B.R.), Medicine (S.B.R.), and Emergency Medicine (S.B.R.), University of Wisconsin, 600 Highland Ave, Madison, WI 53792-3252; Department of Radiology, University of Yamanashi, Yamanashi, Japan (U.M., K.S.); and Department of Radiology, University Hospital Hamburg-Eppendorf, Hamburg, Germany (P.B.)
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19
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Validation of 10-Minute Delayed Hepatocyte Phase Imaging with 30° Flip Angle in Gadoxetic Acid-Enhanced MRI for the Detection of Liver Metastasis. PLoS One 2015; 10:e0139863. [PMID: 26444677 PMCID: PMC4596879 DOI: 10.1371/journal.pone.0139863] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Accepted: 09/16/2015] [Indexed: 01/22/2023] Open
Abstract
Objectives To compare 10-minute delayed hepatocyte phase imaging using a 30° flip angle (10min-FA30) and 20-minute hepatocyte phase imaging using a 10° FA (20min-FA10) in gadoxetic acid-enhanced MRI of patients with possible liver metastases, regarding lesion-to-liver contrast-to-noise ratio (CNR) and focal hepatic lesion (FHL) detection to evaluate whether 10min-FA30 would be superior to 20min-FA10. Materials and Methods Eighty-three patients with 248 liver metastases and 78 benign FHLs who underwent gadoxetic acid-enhanced MRI with 10min-FA30 and 20min-FA10 were enrolled. Lesion-to-liver CNRs were compared between the two image groups. Two radiologists independently assessed the presence of FHLs using a four-point scale and detection sensitivity was calculated. Results The mean CNR for liver metastases on the 10min-FA30 (248.5 ± 101.6) were significantly higher than that of the 20min-FA10 (187.4 ± 77.4) (p < 0.001). The mean CNR difference between the two image groups was 61.2 ± 56.8. There was no significant difference in detection sensitivity of FHLs for two readers between 10min-FA30 (mean 97.7%) and 20min-FA10 (mean 97.9%), irrespective of the lesion size or malignancy. Conclusion 10min-FA30 yielded higher CNR with similar sensitivity compared to 20min-FA10. This finding indicates that 10min-FA30 can potentially replace 20min-FA10 with higher diagnostic performance and save 10 minutes of time.
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Bajpai S, Kambadakone A, Guimaraes AR, Arellano RS, Gervais DA, Sahani D. Image-guided Treatment in the Hepatobiliary System: Role of Imaging in Treatment Planning and Posttreatment Evaluation. Radiographics 2015; 35:1393-418. [DOI: 10.1148/rg.2015140281] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Current Status of Imaging to Evaluate Liver Metastases From Colorectal Cancer. CURRENT COLORECTAL CANCER REPORTS 2015. [DOI: 10.1007/s11888-015-0272-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Merkle EM, Zech CJ, Bartolozzi C, Bashir MR, Ba-Ssalamah A, Huppertz A, Lee JM, Ricke J, Sakamoto M, Sirlin CB, Ye SL, Zeng M. Consensus report from the 7th International Forum for Liver Magnetic Resonance Imaging. Eur Radiol 2015; 26:674-82. [PMID: 26070500 PMCID: PMC4747985 DOI: 10.1007/s00330-015-3873-2] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Revised: 05/21/2015] [Accepted: 06/02/2015] [Indexed: 12/13/2022]
Abstract
Objectives Liver-specific MRI is a fast-growing field, with technological and protocol advancements providing more robust imaging and allowing a greater depth of information per examination. This article reports the evidence for, and expert thinking on, current challenges in liver-specific MRI, as discussed at the 7th International Forum for Liver MRI, which was held in Shanghai, China, in October 2013. Methods Topics discussed included the role of gadoxetic acid-enhanced MRI in the differentiation of focal nodular hyperplasia from hepatocellular adenoma and small hepatocellular carcinoma (HCC) from small intrahepatic cholangiocarcinoma (in patients with chronic liver disease), the differentiation of low-grade dysplastic nodule (DN) from pre-malignant high-grade DN and early HCC, and treatment planning and assessment of treatment response for patients with HCC and colorectal liver metastasis. Optimization of the gadoxetic acid-enhanced MRI protocol to gain robust arterial and hepatobiliary phase images was also discussed. Results and conclusions Gadoxetic acid-enhanced MRI demonstrates added value for the detection and characterization of focal liver lesions and shows promise in a number of new indications, including regional liver functional assessment and patient monitoring after therapy; however, more data are needed in some areas, and further developments are needed to translate cutting-edge techniques into clinical practice. Key Points • Liver-specific MRI is a fast-growing field, with many technological and protocol advancements. • Gadoxetic acid-enhanced MRI demonstrates value for detecting and characterizing focal liver lesions. • Gadoxetic acid-enhanced MRI shows promise in regional functional assessment and patient monitoring. • Further developments are needed to translate cutting-edge techniques into clinical practice.
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Affiliation(s)
- Elmar M Merkle
- Clinic of Radiology and Nuclear Medicine, University Hospital Basel, Petersgraben 4, CH-4031, Basel, Switzerland.
| | - Christoph J Zech
- Clinic of Radiology and Nuclear Medicine, University Hospital Basel, Petersgraben 4, CH-4031, Basel, Switzerland
| | | | - Mustafa R Bashir
- Department of Radiology, Duke University Medical Center, Durham, NC, USA
| | - Ahmed Ba-Ssalamah
- Department of General and Pediatric Radiology, Medical University of Vienna, Vienna, Austria
| | | | - Jeong Min Lee
- Department of Radiology, Seoul National University Hospital, Seoul, South Korea
| | - Jens Ricke
- Department of Radiology and Nuclear Medicine, Otto-von-Guericke Universität Magdeburg, Magdeburg, Germany
| | - Michiie Sakamoto
- Department of Pathology, Keio University School of Medicine, Tokyo, Japan
| | - Claude B Sirlin
- Liver Imaging Group, Department of Radiology, University of California, San Diego, California, USA
| | - Sheng-Long Ye
- Department of Hepatic Oncology, Zhongshan Hospital, Fudan University, Shanghai, People's Republic of China
| | - Mengsu Zeng
- Radiologic Diagnostic Department, Zhongshan Hospital, Fudan University, Shanghai, People's Republic of China
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Gadoxetic acid-enhanced MRI and diffusion-weighted imaging for the detection of colorectal liver metastases after neoadjuvant chemotherapy. Eur Radiol 2015; 25:2428-36. [DOI: 10.1007/s00330-015-3615-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2014] [Revised: 10/18/2014] [Accepted: 01/20/2015] [Indexed: 12/26/2022]
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Costa EAC, Cunha GM, Smorodinsky E, Cruite I, Tang A, Marks RM, Clark L, Wolfson T, Gamst A, Sicklick JK, Hemming A, Peterson MR, Middleton MS, Sirlin CB. Diagnostic Accuracy of Preoperative Gadoxetic Acid-enhanced 3-T MR Imaging for Malignant Liver Lesions by Using Ex Vivo MR Imaging-matched Pathologic Findings as the Reference Standard. Radiology 2015; 276:775-86. [PMID: 25875972 DOI: 10.1148/radiol.2015142069] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
PURPOSE To determine per-lesion sensitivity and positive predictive value (PPV) of gadoxetic acid-enhanced 3-T magnetic resonance (MR) imaging for the diagnosis of malignant lesions by using matched (spatially correlated) hepatectomy pathologic findings as the reference standard. Materials and METHODS In this prospective, institutional review board-approved, HIPAA-compliant study, 20 patients (nine men, 11 women; mean age, 59 years) with malignant liver lesions who gave written informed consent underwent preoperative gadoxetic acid-enhanced 3-T MR imaging for surgical planning. Two image sets were independently analyzed by three readers to detect liver lesions (set 1 without and set 2 with hepatobiliary phase [HBP] images). Hepatectomy specimen ex vivo MR imaging assisted in matching gadoxetic acid-enhanced 3-T MR imaging findings with pathologic findings. Interreader agreement was assessed by using the Cohen κ coefficient. Per-lesion sensitivity and PPV were calculated. RESULTS Cohen κ values were 0.64-0.76 and 0.57-0.84, and overall per-lesion sensitivity was 45% (42 of 94 lesions) to 56% (53 of 94 lesions) and 58% (55 of 94 lesions) to 64% (60 of 94 lesions) for sets 1 and 2, respectively. The addition of HBP imaging did not affect interreader agreement but significantly improved overall sensitivity for one reader (P < .05) and almost for another (P = .05). Sensitivity for 0.2-0.5-cm lesions was 0% (0 of 26 lesions) to 8% (two of 26 lesions) for set 1 and 4% (one of 26 lesions) to 12% (three of 26 lesions) for set 2. Sensitivity for 0.6-1.0-cm lesions was 28% (nine of 32 lesions) to 59% (19 of 32 lesions) for set 1 and 66% (21 of 32 lesions) to 69% (22 of 32 lesions) for set 2. Sensitivity for lesions at least 1.0 cm in diameter was at least 81% (13 of 16 lesions) for set 1 and was not improved for set 2. PPV was 98% (56 of 57 lesions) to 100% (60 of 60 lesions) for all readers without differences between image sets or lesion size. CONCLUSION Gadoxetic acid-enhanced 3-T MR imaging provides high per-lesion sensitivity and PPV for preoperative malignant liver lesion detection overall, although sensitivity for 0.2-0.5-cm malignant lesions is poor.
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Affiliation(s)
- Eduardo A C Costa
- From the Liver Imaging Group, Department of Radiology, University of California-San Diego, 408 Dickinson St, San Diego, CA 92103-8226 (E.A.C.C., G.M.C., E.S., I.C., A.T., R.M.M., L.C., M.S.M., C.B.S.); Department of Radiology, Naval Medical Center San Diego, San Diego, Calif (R.M.M.); Computational and Applied Statistics Laboratory, San Diego Supercomputer Center, University of California-San Diego, San Diego, Calif (T.W., A.G.); Department of Surgery and Moores Cancer Center, University of California-San Diego, San Diego, Calif (J.K.S., A.H.); and Western Washington Pathology and Multicare Health System, Tacoma, Wash (M.R.P.)
| | - Guilherme M Cunha
- From the Liver Imaging Group, Department of Radiology, University of California-San Diego, 408 Dickinson St, San Diego, CA 92103-8226 (E.A.C.C., G.M.C., E.S., I.C., A.T., R.M.M., L.C., M.S.M., C.B.S.); Department of Radiology, Naval Medical Center San Diego, San Diego, Calif (R.M.M.); Computational and Applied Statistics Laboratory, San Diego Supercomputer Center, University of California-San Diego, San Diego, Calif (T.W., A.G.); Department of Surgery and Moores Cancer Center, University of California-San Diego, San Diego, Calif (J.K.S., A.H.); and Western Washington Pathology and Multicare Health System, Tacoma, Wash (M.R.P.)
| | - Emmanuil Smorodinsky
- From the Liver Imaging Group, Department of Radiology, University of California-San Diego, 408 Dickinson St, San Diego, CA 92103-8226 (E.A.C.C., G.M.C., E.S., I.C., A.T., R.M.M., L.C., M.S.M., C.B.S.); Department of Radiology, Naval Medical Center San Diego, San Diego, Calif (R.M.M.); Computational and Applied Statistics Laboratory, San Diego Supercomputer Center, University of California-San Diego, San Diego, Calif (T.W., A.G.); Department of Surgery and Moores Cancer Center, University of California-San Diego, San Diego, Calif (J.K.S., A.H.); and Western Washington Pathology and Multicare Health System, Tacoma, Wash (M.R.P.)
| | - Irene Cruite
- From the Liver Imaging Group, Department of Radiology, University of California-San Diego, 408 Dickinson St, San Diego, CA 92103-8226 (E.A.C.C., G.M.C., E.S., I.C., A.T., R.M.M., L.C., M.S.M., C.B.S.); Department of Radiology, Naval Medical Center San Diego, San Diego, Calif (R.M.M.); Computational and Applied Statistics Laboratory, San Diego Supercomputer Center, University of California-San Diego, San Diego, Calif (T.W., A.G.); Department of Surgery and Moores Cancer Center, University of California-San Diego, San Diego, Calif (J.K.S., A.H.); and Western Washington Pathology and Multicare Health System, Tacoma, Wash (M.R.P.)
| | - An Tang
- From the Liver Imaging Group, Department of Radiology, University of California-San Diego, 408 Dickinson St, San Diego, CA 92103-8226 (E.A.C.C., G.M.C., E.S., I.C., A.T., R.M.M., L.C., M.S.M., C.B.S.); Department of Radiology, Naval Medical Center San Diego, San Diego, Calif (R.M.M.); Computational and Applied Statistics Laboratory, San Diego Supercomputer Center, University of California-San Diego, San Diego, Calif (T.W., A.G.); Department of Surgery and Moores Cancer Center, University of California-San Diego, San Diego, Calif (J.K.S., A.H.); and Western Washington Pathology and Multicare Health System, Tacoma, Wash (M.R.P.)
| | - Robert M Marks
- From the Liver Imaging Group, Department of Radiology, University of California-San Diego, 408 Dickinson St, San Diego, CA 92103-8226 (E.A.C.C., G.M.C., E.S., I.C., A.T., R.M.M., L.C., M.S.M., C.B.S.); Department of Radiology, Naval Medical Center San Diego, San Diego, Calif (R.M.M.); Computational and Applied Statistics Laboratory, San Diego Supercomputer Center, University of California-San Diego, San Diego, Calif (T.W., A.G.); Department of Surgery and Moores Cancer Center, University of California-San Diego, San Diego, Calif (J.K.S., A.H.); and Western Washington Pathology and Multicare Health System, Tacoma, Wash (M.R.P.)
| | - Lisa Clark
- From the Liver Imaging Group, Department of Radiology, University of California-San Diego, 408 Dickinson St, San Diego, CA 92103-8226 (E.A.C.C., G.M.C., E.S., I.C., A.T., R.M.M., L.C., M.S.M., C.B.S.); Department of Radiology, Naval Medical Center San Diego, San Diego, Calif (R.M.M.); Computational and Applied Statistics Laboratory, San Diego Supercomputer Center, University of California-San Diego, San Diego, Calif (T.W., A.G.); Department of Surgery and Moores Cancer Center, University of California-San Diego, San Diego, Calif (J.K.S., A.H.); and Western Washington Pathology and Multicare Health System, Tacoma, Wash (M.R.P.)
| | - Tanya Wolfson
- From the Liver Imaging Group, Department of Radiology, University of California-San Diego, 408 Dickinson St, San Diego, CA 92103-8226 (E.A.C.C., G.M.C., E.S., I.C., A.T., R.M.M., L.C., M.S.M., C.B.S.); Department of Radiology, Naval Medical Center San Diego, San Diego, Calif (R.M.M.); Computational and Applied Statistics Laboratory, San Diego Supercomputer Center, University of California-San Diego, San Diego, Calif (T.W., A.G.); Department of Surgery and Moores Cancer Center, University of California-San Diego, San Diego, Calif (J.K.S., A.H.); and Western Washington Pathology and Multicare Health System, Tacoma, Wash (M.R.P.)
| | - Anthony Gamst
- From the Liver Imaging Group, Department of Radiology, University of California-San Diego, 408 Dickinson St, San Diego, CA 92103-8226 (E.A.C.C., G.M.C., E.S., I.C., A.T., R.M.M., L.C., M.S.M., C.B.S.); Department of Radiology, Naval Medical Center San Diego, San Diego, Calif (R.M.M.); Computational and Applied Statistics Laboratory, San Diego Supercomputer Center, University of California-San Diego, San Diego, Calif (T.W., A.G.); Department of Surgery and Moores Cancer Center, University of California-San Diego, San Diego, Calif (J.K.S., A.H.); and Western Washington Pathology and Multicare Health System, Tacoma, Wash (M.R.P.)
| | - Jason K Sicklick
- From the Liver Imaging Group, Department of Radiology, University of California-San Diego, 408 Dickinson St, San Diego, CA 92103-8226 (E.A.C.C., G.M.C., E.S., I.C., A.T., R.M.M., L.C., M.S.M., C.B.S.); Department of Radiology, Naval Medical Center San Diego, San Diego, Calif (R.M.M.); Computational and Applied Statistics Laboratory, San Diego Supercomputer Center, University of California-San Diego, San Diego, Calif (T.W., A.G.); Department of Surgery and Moores Cancer Center, University of California-San Diego, San Diego, Calif (J.K.S., A.H.); and Western Washington Pathology and Multicare Health System, Tacoma, Wash (M.R.P.)
| | - Alan Hemming
- From the Liver Imaging Group, Department of Radiology, University of California-San Diego, 408 Dickinson St, San Diego, CA 92103-8226 (E.A.C.C., G.M.C., E.S., I.C., A.T., R.M.M., L.C., M.S.M., C.B.S.); Department of Radiology, Naval Medical Center San Diego, San Diego, Calif (R.M.M.); Computational and Applied Statistics Laboratory, San Diego Supercomputer Center, University of California-San Diego, San Diego, Calif (T.W., A.G.); Department of Surgery and Moores Cancer Center, University of California-San Diego, San Diego, Calif (J.K.S., A.H.); and Western Washington Pathology and Multicare Health System, Tacoma, Wash (M.R.P.)
| | - Michael R Peterson
- From the Liver Imaging Group, Department of Radiology, University of California-San Diego, 408 Dickinson St, San Diego, CA 92103-8226 (E.A.C.C., G.M.C., E.S., I.C., A.T., R.M.M., L.C., M.S.M., C.B.S.); Department of Radiology, Naval Medical Center San Diego, San Diego, Calif (R.M.M.); Computational and Applied Statistics Laboratory, San Diego Supercomputer Center, University of California-San Diego, San Diego, Calif (T.W., A.G.); Department of Surgery and Moores Cancer Center, University of California-San Diego, San Diego, Calif (J.K.S., A.H.); and Western Washington Pathology and Multicare Health System, Tacoma, Wash (M.R.P.)
| | - Michael S Middleton
- From the Liver Imaging Group, Department of Radiology, University of California-San Diego, 408 Dickinson St, San Diego, CA 92103-8226 (E.A.C.C., G.M.C., E.S., I.C., A.T., R.M.M., L.C., M.S.M., C.B.S.); Department of Radiology, Naval Medical Center San Diego, San Diego, Calif (R.M.M.); Computational and Applied Statistics Laboratory, San Diego Supercomputer Center, University of California-San Diego, San Diego, Calif (T.W., A.G.); Department of Surgery and Moores Cancer Center, University of California-San Diego, San Diego, Calif (J.K.S., A.H.); and Western Washington Pathology and Multicare Health System, Tacoma, Wash (M.R.P.)
| | - Claude B Sirlin
- From the Liver Imaging Group, Department of Radiology, University of California-San Diego, 408 Dickinson St, San Diego, CA 92103-8226 (E.A.C.C., G.M.C., E.S., I.C., A.T., R.M.M., L.C., M.S.M., C.B.S.); Department of Radiology, Naval Medical Center San Diego, San Diego, Calif (R.M.M.); Computational and Applied Statistics Laboratory, San Diego Supercomputer Center, University of California-San Diego, San Diego, Calif (T.W., A.G.); Department of Surgery and Moores Cancer Center, University of California-San Diego, San Diego, Calif (J.K.S., A.H.); and Western Washington Pathology and Multicare Health System, Tacoma, Wash (M.R.P.)
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The impact of hepatocyte phase imaging from infancy to young adulthood in patients with a known or suspected liver lesion. Pediatr Radiol 2015; 45:354-65. [PMID: 25246096 DOI: 10.1007/s00247-014-3160-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Revised: 07/21/2014] [Accepted: 08/15/2014] [Indexed: 12/17/2022]
Abstract
OBJECTIVE Hepatocyte-specific contrast agents are used to help characterize liver lesions. However, there are no studies evaluating the utility of these agents in detecting or diagnosing pediatric liver lesions. The purpose of this study is to assess the impact of the hepatocyte phase of imaging on lesion detection, tumor staging and diagnostic confidence. MATERIALS AND METHODS All patients undergoing an MRI between September 2010 and August 2012 using gadoxetate disodium as the contrast agent were included in this study. Each exam was duplicated so that one copy contained all sequences, including the hepatocyte phase of imaging, and the other copy contained all sequences except the hepatocyte phase of imaging. One reviewer evaluated all exams in a blinded, random fashion. Data tracked included imaging diagnosis, confidence in diagnosis, number of lesions and PRETEXT grade. The imaging diagnosis was compared to histopathology, when available. Data were analyzed for the study population as well as the subset of patients diagnosed with focal nodular hyperplasia (FNH). RESULTS There were 112 patients (56 male; mean age: 9.25 years) included in this study. A total of 33 patients had a malignant tumor and the remainder had either a benign lesion or no lesion. The addition of the hepatocyte phase of imaging significantly improved the diagnostic confidence for all patients (P < 0.0001) as well as specifically for patients diagnosed with FNH (P = 0.003). In nearly a quarter of patients, the hepatocyte phase of imaging allowed the reviewer to detect additional lesions (P = 0.005). In the patients with a malignant tumor, the addition of the hepatocyte phase of imaging changed the PRETEXT grade in 7/30 patients although the results were not significant (P = 0.161). CONCLUSION The addition of the hepatocyte phase of imaging helps to improve lesion detection and increase the diagnostic confidence for all liver tumors, as well as for FNH in particular.
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Feasibility of 5-minute delayed transition phase imaging with 30° flip angle in gadoxetic acid-enhanced 3D gradient-echo MRI of liver, compared with 20-minute delayed hepatocyte phase MRI with standard 10° flip angle. AJR Am J Roentgenol 2015; 204:69-75. [PMID: 25539239 DOI: 10.2214/ajr.13.11903] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
OBJECTIVE The purpose of this study was to compare 5-minute delayed transitional phase imaging using a 30° flip angle (hereafter, 5 min-FA30) and 20-minute hepatocyte phase imaging using a 10° flip angle (hereafter, 20 min-FA10) in gadoxetic acid-enhanced MRI for focal hepatic lesion detection and lesion-to-liver contrast-to-noise ratio (CNR), and to determine whether 5 min-FA30 could replace 20 min-FA10 with a 15-minute time saving. MATERIALS AND METHODS One hundred sixteen patients with 282 focal hepatic lesions (size range, 0.2-12.5 cm; malignant, n = 146; benign, n = 136) underwent gadoxetic acid-enhanced MRI with 5 min-FA30 and 20 min-FA10 with a 3D T1-weighted gradient-echo sequence. Three radiologists independently assessed the presence of focal hepatic lesions using a 4-point scale, and detection sensitivity of focal hepatic lesions was calculated. Lesion-to-liver CNRs were calculated and compared in two image groups. RESULTS There was no significant difference in detection sensitivity of focal hepatic lesions for all three readers between 5 min-FA30 (mean, 95.4%) and 20 min-FA10 (mean, 95.6%), irrespective of lesion size or malignancy. The mean CNR on 5 min-FA30 (167.9 ± 84.1) was significantly higher than that on 20 min-FA10 (160.2 ± 79.5). However, the mean CNR difference between the two image groups was relatively small (7.8 ± 41.9). CONCLUSION Compared with 20 min-FA10, 5 min-FA30 provided higher CNR and similar sensitivity. These findings indicate that 5 min-FA30 could replace 20-min delayed hepatocyte phase imaging using a 10° flip angle with similar diagnostic performance and 15 minutes of time saving.
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Palmucci S. Focal liver lesions detection and characterization: The advantages of gadoxetic acid-enhanced liver MRI. World J Hepatol 2014; 6:477-485. [PMID: 25067999 PMCID: PMC4110539 DOI: 10.4254/wjh.v6.i7.477] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Revised: 05/14/2014] [Accepted: 06/11/2014] [Indexed: 02/06/2023] Open
Abstract
Since its clinical introduction, several studies in literature have investigated gadolinium ethoxybenzhyl diethylenetriaminepentaacetic acid or gadoxetic acid (Gd-EOB-DTPA) properties. Following contrast injection, it provides dynamic vascular phases (arterial, portal and equilibrium phases) and hepatobiliary phase, the latter due to its uptake by functional hepatocytes. The main advantages of Gd-EOB-DTPA of focal liver lesion detection and characterization are discussed in this paper. Namely, we focus on the possibility of distinguishing focal nodular hyperplasia (FNH) from hepatic adenoma (HA), the identification of early hepatocellular carcinoma (HCC) and the pre-operative assessment of metastasis in liver parenchyma. Regarding the differentiation between FNH and HA, adenoma typically appears hypointense in hepatobiliary phase, whereas FNH is isointense or hyperintense to the surrounding hepatic parenchyma. As for the identification of early HCCs, many papers recently published in literature have emphasized the contribution of hepatobiliary phase in the characterization of nodules without a typical hallmark of HCC. Atypical nodules (no hypervascularizaton observed on arterial phase and/or no hypovascular appearance on portal phase) with low signal intensity in the hepatobiliary phase, have a high probability of malignancy. Finally, regarding the evaluation of focal hepatic metastases, magnetic resonance pre-operative assessment using gadoxetic acid allows for more accurate diagnosis.
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Bashir MR, Breault SR, Braun R, Do RK, Nelson RC, Reeder SB. Optimal timing and diagnostic adequacy of hepatocyte phase imaging with gadoxetate-enhanced liver MRI. Acad Radiol 2014; 21:726-32. [PMID: 24717550 DOI: 10.1016/j.acra.2014.02.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 02/07/2014] [Accepted: 02/10/2014] [Indexed: 12/23/2022]
Abstract
RATIONALE AND OBJECTIVES To evaluate clinical and imaging features associated with adequacy of the hepatocyte phase (HP) in gadoxetate disodium-enhanced liver magnetic resonance imaging (MRI) in patients without chronic liver disease (CLD). MATERIALS AND METHODS This was a retrospective institutional review board-approved study of 97 patients who underwent liver MRI examinations with gadoxetate disodium and had no history of CLD. Available late dynamic and HP sequences (3-20 minutes postinjection) were independently analyzed by four radiologists for perceived image adequacy and level of biliary enhancement. Signal intensity ratios (SIRs) of liver/inferior vena cava (IVC), liver/spleen, and liver/muscle were measured. The Spearman ρ and receiver operating characteristic analyses were performed correlating various factors with HP adequacy. A rule for predicting HP adequacy was also derived and tested to determine whether overall examination time could be shortened. RESULTS A visually adequate HP was observed in 12% of subjects by 10 minutes, 80% by 15 minutes, and 93% by 20 minutes. An SIRliver/IVC > 1.8 was the imaging feature that had the strongest correlation with an adequate HP (ρ = 0.813, P < .001), and was more predictive of adequacy of the HP than the time postinjection (ρ = 0.5, P < .001). The time at which an adequate HP was first observed did not correlate with any tested demographic or laboratory values. Stopping imaging when an SIRliver/IVC > 1.8 would have successfully reduced mean postcontrast time to 15:39 ± 4:02 from 20:00 (P < .001), although maintaining HP adequacy. CONCLUSIONS Most patients without CLD undergoing gadoxetate-enhanced liver MRI achieve adequate HP at 20 minutes. However, a shorter postcontrast stopping time can be used in most patients.
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Affiliation(s)
- Mustafa R Bashir
- Department of Radiology, Duke University Medical Center, DUMC 3808, Durham, NC 27710.
| | - Steven R Breault
- Department of Radiology, Duke University Medical Center, DUMC 3808, Durham, NC 27710
| | - Ryan Braun
- Department of Radiology, Rush University Medical Center, Chicago, IL 60612
| | - Richard K Do
- Department of Radiology, Memorial Sloan-Kettering Cancer Center, New York, NY 10065
| | - Rendon C Nelson
- Department of Radiology, Duke University Medical Center, DUMC 3808, Durham, NC 27710
| | - Scott B Reeder
- Department of Radiology, University of Wisconsin, Madison, WI 53792; Department of Medical Physics, University of Wisconsin, Madison, WI 53792; Department of Biomedical Engineering, University of Wisconsin, Madison, WI 53792; Department of Medicine, University of Wisconsin, Madison, WI 53792
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Current status of imaging and emerging techniques to evaluate liver metastases from colorectal carcinoma. Ann Surg 2014; 259:861-72. [PMID: 24509207 DOI: 10.1097/sla.0000000000000525] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Colorectal cancer is the third most common cancer diagnosed in both men and women in the United States. Liver is a common site of tumor spread and in approximately 30% of the cases; synchronous liver disease is present at the time of diagnosis. Early detection of liver metastases is crucial to appropriately select patients who may benefit from hepatic resection among those needing chemotherapy, to improve 5-year survival. Advances in imaging techniques have contributed greatly to the management of these patients. Multidetector computed tomography is the most useful test for initial staging and in posttreatment surveillance settings. Magnetic resonance imaging is considered superior to multidetector computed tomography and positron emission tomography for the detection and characterization of small lesions and for liver evaluation in the presence of background fatty liver changes. Positron emission tomography-computed tomography has a problem-solving role in the detection of distant metastasis and in posttreatment evaluation. The advanced imaging methods also serve a role in selecting appropriate patients for radiologically targeted therapies and in monitoring response to conventional and novel therapies.
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Thian YL, Riddell AM, Koh DM. Liver-specific agents for contrast-enhanced MRI: role in oncological imaging. Cancer Imaging 2013; 13:567-79. [PMID: 24434892 PMCID: PMC3893895 DOI: 10.1102/1470-7330.2013.0050] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/05/2013] [Indexed: 02/06/2023] Open
Abstract
Liver-specific magnetic resonance (MR) contrast agents are increasingly used in evaluation of the liver. They are effective in detection and morphological characterization of lesions, and can be useful for evaluation of biliary tree anatomy and liver function. The typical appearances and imaging pitfalls of various tumours at MR imaging performed with these agents can be understood by the interplay of pharmacokinetics of these contrast agents and transporter expression of the tumour. This review focuses on the applications of these agents in oncological imaging.
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Affiliation(s)
- Yee Liang Thian
- Department of Diagnostic Imaging, National University Hospital Singapore, 5 Lower Kent Ridge Road, Singapore 119074; Department of Diagnostic Radiology, Royal Marsden Hospital Foundation Trust, Downs Road, Sutton, Surrey SM2 5PT, UK
| | - Angela M. Riddell
- Department of Diagnostic Imaging, National University Hospital Singapore, 5 Lower Kent Ridge Road, Singapore 119074; Department of Diagnostic Radiology, Royal Marsden Hospital Foundation Trust, Downs Road, Sutton, Surrey SM2 5PT, UK
| | - Dow-Mu Koh
- Department of Diagnostic Imaging, National University Hospital Singapore, 5 Lower Kent Ridge Road, Singapore 119074; Department of Diagnostic Radiology, Royal Marsden Hospital Foundation Trust, Downs Road, Sutton, Surrey SM2 5PT, UK
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Sirlin CB, Hussain HK, Jonas E, Kanematsu M, Min Lee J, Merkle EM, Peck-Radosavljevic M, Reeder SB, Ricke J, Sakamoto M. Consensus report from the 6th International forum for liver MRI using gadoxetic acid. J Magn Reson Imaging 2013; 40:516-29. [PMID: 24923695 DOI: 10.1002/jmri.24419] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Accepted: 08/21/2013] [Indexed: 02/06/2023] Open
Abstract
As the utility of liver-specific magnetic resonance imaging (MRI) increases, it is pertinent to optimize and expand protocols to improve accuracy and foster evolution of techniques; in turn, positive impacts should be seen in patient management. This article reports on the latest expert thinking and current evidence in the field of liver-specific MRI, as discussed at the 6(th) International Forum for Liver MRI, which was held in Vancouver, Canada in September 2012. Topics discussed at this forum described the use of gadoxetic acid-enhanced MRI for the assessment of liver function at the segmental level; to increase accuracy in the diagnosis of liver metastases; to overcome current challenges in patients with cirrhosis, including management of arterial hypo-/isovascular, hepatobiliary phase hypointense nodules; and the data which would be required in order to recommend the use of this modality in hepatocellular carcinoma management guidelines. Growing evidence suggests that gadoxetic acid-enhanced MRI can help to improve the management of patients with a number of different liver disorders; however, more data are needed in some areas, and there may be a case for developing an interpretation guideline for gadoxetic acid-enhanced MRI findings to aid standardization.
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Affiliation(s)
- Claude B Sirlin
- Liver Imaging Group, Department of Radiology, University of California, San Diego, California, USA
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Kim MY, Kim YK, Park HJ, Park MJ, Lee WJ, Choi D. Diagnosis of focal liver lesions with gadoxetic acid-enhanced MRI: is a shortened delay time possible by adding diffusion-weighted imaging? J Magn Reson Imaging 2013; 39:31-41. [PMID: 24115329 DOI: 10.1002/jmri.24122] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2012] [Accepted: 02/20/2013] [Indexed: 01/02/2023] Open
Abstract
PURPOSE To determine whether the diagnostic performance of combined gadoxetic acid-enhanced dynamic phases and diffusion-weighted imaging (DWI) is comparable to the standard protocol with hepatobiliary phase (HBP) and DWI for detection and characterization of focal liver lesions in chronic liver disease. MATERIALS AND METHODS A total of 176 patients with 181 HCCs, 15 cholangiocarcinomas, and 32 benign lesions were included. Three combined gadoxetic acid-enhanced and DWI sets (dynamic phases [arterial, portal, and 3-min delay {3-min set} and dynamic phases with 10-min HBP [10-min set] or 20-min HBP [20-min set]) were analyzed by two observers to determine the diagnostic accuracy and sensitivity in detection of malignancy, and ability for lesion characterization. RESULTS There was a trend, although not statistically significant, toward highest diagnostic accuracy and sensitivity for detecting malignancies in the 20-min set (mean, 0.945, 96.2), followed by the 10-min set (0.937, 95.9), and the 3-min set (0.923, 94.1) (P > 0.05). For lesion characterization, three image sets were equivalent (P > 0.05). CONCLUSION For lesion detection and characterization in chronic liver diseases, 3-min set with DWI showed comparable efficacy to 10-min or 20-min set. However, the best diagnostic performance could be achieved by combination of all image sets.
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Affiliation(s)
- Moon Young Kim
- Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
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de Souza DAT, Parente DB, de Araújo ALE, Mortelé KJ. Modern imaging evaluation of the liver: emerging MR imaging techniques and indications. Magn Reson Imaging Clin N Am 2013; 21:337-63. [PMID: 23642557 DOI: 10.1016/j.mric.2013.01.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Modern MR imaging evaluation of the liver allows for a comprehensive morphologic and functional assessment of the liver parenchyma, hepatic vessels, and biliary tree, thus aiding in the diagnosis of both focal and diffuse liver diseases.
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MOTOSUGI U, ICHIKAWA T, ARAKI T. Rules, Roles, and Room for Discussion in Gadoxetic Acid-enhanced Magnetic Resonance Liver Imaging: Current Knowledge and Future Challenges. Magn Reson Med Sci 2013; 12:161-75. [DOI: 10.2463/mrms.2012-0085] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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