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Courault P, Zimmer L, Lancelot S. Toward Functional PET Imaging of the Spinal Cord. Semin Nucl Med 2024:S0001-2998(24)00066-7. [PMID: 39181820 DOI: 10.1053/j.semnuclmed.2024.07.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2024] [Accepted: 07/25/2024] [Indexed: 08/27/2024]
Abstract
At present, spinal cord imaging primarily uses magnetic resonance imaging (MRI) or computed tomography (CT), but the greater sensitivity of positron emission tomography (PET) techniques and the development of new radiotracers are paving the way for a new approach. The substantial rise in publications on PET radiotracers for spinal cord exploration indicates a growing interest in the functional and molecular imaging of this organ. The present review aimed to provide an overview of the various radiotracers used in this indication, in preclinical and clinical settings. Firstly, we outline spinal cord anatomy and associated target pathologies. Secondly, we present the state-of-the-art of spinal cord imaging techniques used in clinical practice, with their respective strengths and limitations. Thirdly, we summarize the literature on radiotracers employed in functional PET imaging of the spinal cord. In conclusion, we propose criteria for an ideal radiotracer for molecular spinal cord imaging, emphasizing the relevance of multimodal hybrid cameras, and particularly the benefits of PET-MRI integration.
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Affiliation(s)
- Pierre Courault
- Lyon Neuroscience Research Center (CRNL), INSERM, CNRSx, Lyon, France; Hospices Civils de Lyon (HCL), Lyon, France; CERMEP-Imaging Platform, Lyon, France
| | - Luc Zimmer
- Lyon Neuroscience Research Center (CRNL), INSERM, CNRSx, Lyon, France; Hospices Civils de Lyon (HCL), Lyon, France; CERMEP-Imaging Platform, Lyon, France; National Institute for Nuclear Science and Technology (INSTN), CEA, Saclay, France.
| | - Sophie Lancelot
- Lyon Neuroscience Research Center (CRNL), INSERM, CNRSx, Lyon, France; Hospices Civils de Lyon (HCL), Lyon, France; CERMEP-Imaging Platform, Lyon, France
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Gao Y, Ye W, Ge X, Wang H, Xiong J, Zhu Y, Wang Z, Wang J, Tang P, Liu W, Cai W. Assessing the utility of MRI-based vertebral bone quality (VBQ) for predicting lumbar pedicle screw loosening. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2024; 33:289-297. [PMID: 37981599 DOI: 10.1007/s00586-023-08034-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 10/18/2023] [Accepted: 10/28/2023] [Indexed: 11/21/2023]
Abstract
STUDY DESIGN Retrospective cohort. OBJECTIVE The purpose of this study is to assess the potential of utilizing the MRI-based vertebral bone quality (VBQ) score as a predictive tool for pedicle screw loosening (PSL) in patients who have undergone pedicle screw fixation and to identify risk factors associated with VBQ scores. METHODS One hundred and sixteen patients who had undergone pedicle screw fixation between December 2019 and January 2021 and had more than a year of follow-up were divided into two groups of PSL and non-PSL. The radiological and clinical parameters investigated were age, gender, body mass index, the VBQ score, length of fusion and the DXA T-score. RESULTS Of the 116 patients included in the study, 22 patients developed pedicle screw loosening after surgery (18.97%). VBQ score of PSL group was higher than the non-PSL group (3.61 ± 0.63 vs. 2. 86 ± 0.43, p < 0.001). According to logistic regression, PSL was independently linked with a higher VBQ score (OR = 3.555, 95% confidence interval [1.620-7.802], p < 0.005). The AUC of predicting screw loosening was 0.774 (p < 0.001) for VBQ score, and the best threshold was 3.055 (sensitivity, 81.8%; specificity, 71.3%). High VBQ score was associated with age (r (114) = 0.29, p = 0.002), while it was not negatively correlated with T-scores of each part. CONCLUSION VBQ score is an independent predictor of pedicle screw loosening, with higher scores indicating a greater risk. Our results showed that older patients and women had higher VBQ scores.
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Affiliation(s)
- Yu Gao
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China
| | - Wu Ye
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China
| | - Xuhui Ge
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China
| | - Haofan Wang
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China
| | - Junjun Xiong
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China
| | - Yufeng Zhu
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China
| | - Zhuanghui Wang
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China
| | - Jiaxing Wang
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China
| | - Pengyu Tang
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China
| | - Wei Liu
- Department of Orthopedics, Second Affiliated Hospital of Naval Medical University, Shanghai, 200003, China.
| | - Weihua Cai
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China.
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Branco LDMT, Rezende TJR, Reis F, França MC. Advanced Structural Magnetic Resonance Imaging of the Spinal Cord: Technical Aspects and Clinical Use. Semin Ultrasound CT MR 2023; 44:464-468. [PMID: 37581877 DOI: 10.1053/j.sult.2023.03.016] [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: 04/08/2023]
Abstract
For a long time, technical obstacles have hampered the acquisition of high-resolution images and the development of reliable processing protocols for spinal cord (SC) MRI. Fortunately, this scenario has changed in the past 5-10 years, due to hardware and software improvements. Nowadays, with advanced protocols, SC MRI is considered a useful tool for several inherited and acquired neurologic diseases, not only for diagnosis approach but also for pathophysiological unraveling and as a biomarker for disease monitoring and clinical trials. In this review, we address advanced SC MRI sequences for macrostructural and microstructural evaluation, useful semiautomatic and automatic processing tools and clinical applications on several neurologic conditions such as hereditary cerebellar ataxia, hereditary spastic paraplegia, motor neuron diseases and multiple sclerosis.
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Affiliation(s)
- Lucas de M T Branco
- Department of Neurology and Neuroimaging Laboratory, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Thiago J R Rezende
- Department of Neurology and Neuroimaging Laboratory, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Fabiano Reis
- Department of Anesthesiology, Oncology and Radiology, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Marcondes C França
- Department of Neurology and Neuroimaging Laboratory, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil.
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Hermes TDA, Jarry VDM, Reis F, Minatel E. Anatomy and Imaging of the Spinal Cord: An Overview. Semin Ultrasound CT MR 2023; 44:400-407. [PMID: 37555687 DOI: 10.1053/j.sult.2023.03.011] [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: 08/10/2023]
Abstract
The spinal cord comprises the part of the central nervous system located within the vertebral canal, extending from the foramen magnum to approximately the second lumbar vertebra. The spinal cord is covered by 3 meninges: dura mater, arachnoid mater, and pia mater (arranged from the outermost layer inward). A cross-section of the spinal cord reveals gray and white matter. Ascending and descending pathways have defined locations in the matter of the spinal cord. This article aims to review the spinal cord anatomy and demonstrate the imaging aspects, which are essential for the interpretation and understanding of spinal cord injuries.
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Affiliation(s)
- Túlio de Almeida Hermes
- Adjunct Professor, Department of Anatomy, Institute of Biomedical Sciences, Federal University of Alfenas (UNIFAL-MG), Minas Gerais, Brazil
| | - Vinicius de Menezes Jarry
- Post graduate student in Neuroradiology, Department of Anesthesiology, Oncology and Radiology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), Sao Paulo, Brazil
| | - Fabiano Reis
- Associate Professor, Department of Anesthesiology, Oncology and Radiology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), Sao Paulo, Brazil
| | - Elaine Minatel
- Associate Professor, Department of Structural and Functional Biology, State University of Campinas (UNICAMP), Sao Paulo, Brazil.
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Russo C, Muto G, Giordano F, Masala S, Muto M. Imaging of Common Spinal Cord Diseases. Semin Musculoskelet Radiol 2022; 26:510-520. [PMID: 36103892 DOI: 10.1055/s-0042-1755345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
Spinal cord evaluation is an integral part of spine assessment, and its reliable imaging work-up is mandatory because even localized lesions may produce serious effects with potentially irreversible sequelae. Spinal cord alterations are found both incidentally during spine evaluation in otherwise neurologically asymptomatic patients or during neurologic/neuroradiologic assessment in myelopathic patients. Myelopathy (an umbrella term for any neurologic deficit that refers to spinal cord impairment) can be caused by intrinsic lesions or extrinsic mechanical compression, and its etiology may be both traumatic and/or nontraumatic. The symptoms largely depend on the size/extension of lesions, ranging from incontinence to ataxia, from spasticity to hyperreflexia, from numbness to weakness. Magnetic resonance imaging is the reference imaging modality in spinal cord evaluation, ensuring the best signal and spatial resolution. We provide an overview of the most common spinal cord disorders encountered by radiologists and describe the technical measures that offer optimal spinal cord visualization.
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Affiliation(s)
- Camilla Russo
- Diagnostic and Interventional Neuroradiology Unit, Dipartimento delle Tecnologie Avanzate Diagnostico-Terapeutiche e dei Servizi sanitari, A.O.R.N. Cardarelli, Naples, Italy.,Department of Electrical Engineering and Information Technology (DIETI), Università Degli Studi di Napoli Federico II, Naples, Italy
| | - Gianluca Muto
- Service de Radiologie, Hôpitaux Universitaires de Genève (HUG), Geneva, Switzerland
| | - Flavio Giordano
- Diagnostic and Interventional Neuroradiology Unit, Dipartimento delle Tecnologie Avanzate Diagnostico-Terapeutiche e dei Servizi sanitari, A.O.R.N. Cardarelli, Naples, Italy
| | - Salvatore Masala
- Department of Diagnostic Imaging, Molecular Imaging, Interventional Radiology and Radiation Therapy, Università degli Studi di Roma Tor Vergata, Rome, Italy
| | - Mario Muto
- Diagnostic and Interventional Neuroradiology Unit, Dipartimento delle Tecnologie Avanzate Diagnostico-Terapeutiche e dei Servizi sanitari, A.O.R.N. Cardarelli, Naples, Italy
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Siasios I, Samara E, Fotiadou A, Tsoleka K, Vadikolias K, Mantatzis M, Birbilis T. The Role of Cervical Muscles Morphology in the Surgical Treatment of Degenerative Disc Disease: Clinical Correlations Based on Magnetic Resonance Imaging Studies. J Clin Med Res 2021; 13:367-376. [PMID: 34394779 PMCID: PMC8336945 DOI: 10.14740/jocmr4551] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 07/16/2021] [Indexed: 12/03/2022] Open
Abstract
Cervical spine musculature still remains a less studied component of the cervical spine anatomical compartments, although it plays a significant role in the mobility of the head and the preservation of cervical spine alignment. The goal of this study was to extract any significant information from the literature regarding the role of cervical spine muscles morphology in the outcome of surgically treated patients for degenerative disc disease (DDD) based on preoperative magnetic resonance imaging (MRI) studies. Eleven clinical case series were found, from which four were prospective and seven were retrospective. Six studies were concentrated on anterior approaches and five studies on posterior approaches in the cervical spine. In posterior approaches aiming at the preservation of muscles attachments and overall less surgical manipulations, results on cervical lordosis, axial pain and patient’s functionality were found superior to traditional laminectomies. The study of cross-sectional areas (CSAs) of deep paraspinal muscles in the cervical spine could add significant information for the spine surgeon such as the prediction of adjacent level disease (ALD), fusion failure, axial pain persistence, postoperative cervical alignment and patient’s postoperative functionality. It seems that MRI studies focusing on muscle layers of the cervical spine could add significant information for the spinal surgeon regarding the final surgical outcome in terms of pain and function expression. Larger multicenter clinical studies are a necessity in defining the role of the muscle component of the cervical spine in the surgical treatment of DDD.
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Affiliation(s)
- Ioannis Siasios
- Department of Neurosurgery, General Hospital of Papageorgiou, Thessaloniki, Greece.,Department of Neurosurgery, General University Hospital of Alexandroupolis, Alexandroupoli, Greece
| | - Ethymia Samara
- Department of Neurology, General Hospital of Papageorgiou, Thessaloniki, Greece
| | - Aggeliki Fotiadou
- Department of Neurology, General University Hospital of Alexandroupolis, Alexandroupoli, Greece
| | - Kalliopi Tsoleka
- Department of Neurosurgery, General Hospital of Papageorgiou, Thessaloniki, Greece
| | - Konstantinos Vadikolias
- Department of Neurology, General University Hospital of Alexandroupolis, Alexandroupoli, Greece
| | - Michael Mantatzis
- Department of Radiology, General University Hospital of Alexandroupolis, Alexandroupoli, Greece
| | - Theodosis Birbilis
- Department of Neurosurgery, General University Hospital of Alexandroupolis, Alexandroupoli, Greece
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Post-contrast T1-weighted spine 3T MRI in children using a golden-angle radial acquisition. Neuroradiology 2019; 61:341-349. [DOI: 10.1007/s00234-019-02165-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Accepted: 01/09/2019] [Indexed: 11/26/2022]
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Talbott JF, Narvid J, Chazen JL, Chin CT, Shah V. An Imaging-Based Approach to Spinal Cord Infection. Semin Ultrasound CT MR 2016; 37:411-30. [PMID: 27616314 DOI: 10.1053/j.sult.2016.05.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Infections of the spinal cord, nerve roots, and surrounding meninges are uncommon, but highly significant given their potential for severe morbidity and even mortality. Prompt diagnosis can be lifesaving, as many spinal infections are treatable. Advances in imaging technology have now firmly established magnetic resonance imaging (MRI) as the gold standard for spinal cord imaging evaluation, enabling the depiction of infectious myelopathies with exquisite detail and contrast. In this article, we aim to provide an overview of MRI findings for spinal cord infections with special focus on imaging patterns of infection that are primarily confined to the spinal cord, spinal meninges, and spinal nerve roots. In this context, we describe and organize this review around 5 distinct patterns of transverse spinal abnormality that may be detected with MRI as follows: (1) extramedullary, (2) centromedullary, (3) eccentric, (4) frontal horn, and (5) irregular. We seek to classify the most common presentations for a wide variety of infectious agents within this image-based framework while realizing that significant overlap and variation exists, including some infections that remain occult with conventional imaging techniques.
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Affiliation(s)
- Jason F Talbott
- Department of Radiology, San Francisco General Hospital, San Francisco, CA; Brain and Spinal Injury Center, San Francisco General Hospital, San Francisco, CA.
| | - Jared Narvid
- Department of Radiology, San Francisco General Hospital, San Francisco, CA
| | - J Levi Chazen
- Department of Radiology, Weill Cornell Medical School, New York, NY
| | - Cynthia T Chin
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA; Department of Radiology, San Francisco General Hospital, San Francisco, CA; Brain and Spinal Injury Center, San Francisco General Hospital, San Francisco, CA; Department of Radiology, Weill Cornell Medical School, New York, NY
| | - Vinil Shah
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA; Department of Radiology, San Francisco General Hospital, San Francisco, CA
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Free-Breathing Radial 3D Fat-Suppressed T1-Weighted Gradient-Echo Sequence for Contrast-Enhanced Pediatric Spinal Imaging: Comparison With T1-Weighted Turbo Spin-Echo Sequence. AJR Am J Roentgenol 2016; 207:177-82. [PMID: 27070492 DOI: 10.2214/ajr.15.15617] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
OBJECTIVE The purpose of this study was to compare free-breathing radially sampled 3D T1-weighted gradient-echo acquisitions (radial volumetric interpolated breath-hold examination [VIBE]) with a T1-weighted turbo spin-echo (TSE) sequence for contrast-enhanced spinal imaging of children with CNS tumors. MATERIALS AND METHODS Twenty-eight consecutively registered children with CNS tumors underwent evaluation of leptomeningeal seeding with 1.5-T MRI that included both radial VIBE and T1-weighted TSE sequences. For qualitative analysis, overall image quality; presence of motion, CSF flow, and radial artifacts; and lesion conspicuity were retrospectively assessed with scoring systems. The signal-intensity uniformity of each sequence was evaluated for quantitative comparison. The acquisition times for each sequence were compared. RESULTS Images obtained with the radial VIBE sequence had a higher overall image quality score than did T1-weighted TSE images (3.61 ± 0.73 vs 2.80 ± 0.69, p < 0.001) and lower motion artifact (0.82 ± 0.43 vs 1.29 ± 0.56, p = 0.001) and CSF flow artifact (0 vs 1.68 ± 0.67, p < 0.001) scores. Radial artifacts were found only on radial VIBE images (1.36 ± 0.31 vs 0, p < 0.001). In 13 patients with spinal seeding nodules, radial VIBE images showed greater lesion conspicuity than did T1-weighted TSE images (4.23 ± 0.52 vs 2.47 ± 0.57, p = 0.005). Radial VIBE images had diminished signal-intensity variation compared with T1-weighted TSE images in air, spine, and muscle (p < 0.01). The mean acquisition times were not significantly different between the two sequences (p = 0.117). CONCLUSION For pediatric spinal imaging, radial VIBE images had better image quality and lesion conspicuity and fewer CSF and respiratory motion artifacts than did T1-weighted TSE images in a similar acquisition time.
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Elliott CA, Fox R, Ashforth R, Gourishankar S, Nataraj A. Magnetic resonance imaging artifact following anterior cervical discectomy and fusion with a trabecular metal cage. J Neurosurg Spine 2016; 24:496-501. [DOI: 10.3171/2015.5.spine14219] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECT
This study was undertaken to evaluate the impact of postoperative MRI artifact on the assessment of ongoing spinal cord or nerve root compression after anterior cervical discectomy and fusion (ACDF) using a trabecular tantalum cage or bone autograft or allograft.
METHODS
The authors conducted a retrospective review of postoperative MRI studies of patients treated surgically for cervical disc degenerative disease or cervical instability secondary to trauma. Standard ACDF with either a trabecular tantalum cage or interbody bone graft had been performed. Postoperative MR images were shown twice in random order to each of 3 assessors (2 spine surgeons, 1 neuroradiologist) to determine whether the presence of a tantalum interbody cage and/or anterior cervical fixation plate or screws imparted MRI artifact significant enough to prevent reliable postoperative assessment of ongoing spinal cord or nerve root compression.
RESULTS
A total of 63 patients were identified. One group of 29 patients received a tantalum interbody cage, with 13 patients (45%) undergoing anterior plate fixation. A second group of 34 patients received bone auto- or allograft, with 23 (68%) undergoing anterior plate fixation. The paramagnetic implant construct artifact had minimal impact on visualization of postoperative surgical level spinal cord compression. In the cage group, 98% (171/174) of the cases were rated as assessable versus 99% in the bone graft group (201/204), with high intraobserver reliability. In contrast, for the assessment of ongoing surgical level nerve root compression, the presence of a tantalum cage significantly decreased visualization of nerve roots to 70% (121/174) in comparison with 85% (173/204) in the bone graft group (p < 0.001). When sequences using turbo spin echo (TSE), a T2-weighted axial sequence, were acquired, nerve roots were rated as assessable in 88% (69/78) of cases; when only axial T2-weighted sequences were available, the nerve roots were rated as assessable in 54% (52/96) of cases (p < 0.01). The presence of anterior plate fixation had minimal impact on visualization of the spinal cord (99% [213/216] for plated cases vs 98% [159/162] for nonplated cases; p = 1.0) or nerve roots (79% [170/216] for plated cases vs 77% [124/162] for nonplated cases; p = 0.62).
CONCLUSIONS
Interbody fusion with tantalum cage following anterior cervical discectomy imparts significant paramagnetic artifact, which significantly decreases visualization and assessment of ongoing surgical level nerve root, but not spinal cord, compression. Anterior plate constructs do not affect visualization of these structures. TSE T2-weighted sequences significantly improve nerve root visualization and should be performed as part of a standard postoperative protocol when imaging the cervical spine following interbody implantation of materials with potential for paramagnetic artifact.
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Affiliation(s)
| | - Richard Fox
- 2Department of Radiology and Diagnostic Imaging, and
| | | | - Sita Gourishankar
- 3Division of Nephrology, University of Alberta Hospital, Edmonton, Alberta, Canada
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Role of Magnetic Resonance Imaging in Differentiating Spondylitis from Vertebral Metastasis. Asian Spine J 2015; 9:776-82. [PMID: 26435798 PMCID: PMC4591451 DOI: 10.4184/asj.2015.9.5.776] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Revised: 02/25/2015] [Accepted: 02/27/2015] [Indexed: 12/19/2022] Open
Abstract
Study Design Observational analytic design with a cross-sectional approach. Purpose To analyze the suitability of magnetic resonance imaging (MRI) in distinguishing radiology images with a corresponding delineation of spondylitis and vertebral metastasis confirmed by histology results. Overview of Literature MRI is an accurate modality for assessing vertebrae and their disorders. Infections and metastasis are most commonly found in the vertebrae. It is difficult to differentiate between these two disorders both clinically and radiographically, particularly in atypical cases. Methods McNemar statistical test was used to analyze the data. Samples were chosen using the consecutive method. There were 35 samples (14 males and 21 females), consisting of 22 samples of spondylitis and 13 samples of metastasis confirmed on histology examination. Results Nineteen (86%) out of the 22 samples of histological spondylitis were diagnosed as having spondylitis on MRI, whereas all 13 samples of metastasis were 100% accurately diagnosed on MRI. Conclusions There was no statistically significant difference between diagnostic radiology using MRI and histological diagnosis with a p=0.250 (p>0.05). In this respect, MRI was more precise in diagnosing metastasis. Typical MRI description of spondylitis was the involvement of anterior vertebrae and components of intervertebral discs, stiffening of discs, paravertebral abscess, and involvement of the vertebral segment sequence. Typical MRI delineation of metastasis was involvement of the anterior posterior vertebral component, paravertebral mass, and skip lesions.
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Krupa K, Bekiesińska-Figatowska M. Artifacts in magnetic resonance imaging. Pol J Radiol 2015; 80:93-106. [PMID: 25745524 PMCID: PMC4340093 DOI: 10.12659/pjr.892628] [Citation(s) in RCA: 110] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Accepted: 10/29/2014] [Indexed: 01/13/2023] Open
Abstract
Artifacts in magnetic resonance imaging and foreign bodies within the patient's body may be confused with a pathology or may reduce the quality of examinations. Radiologists are frequently not informed about the medical history of patients and face postoperative/other images they are not familiar with. A gallery of such images was presented in this manuscript. A truncation artifact in the spinal cord could be misinterpreted as a syrinx. Motion artifacts caused by breathing, cardiac movement, CSF pulsation/blood flow create a ghost artifact which can be reduced by patient immobilization, or cardiac/respiratory gating. Aliasing artifacts can be eliminated by increasing the field of view. An artificially hyperintense signal on FLAIR images can result from magnetic susceptibility artifacts, CSF/vascular pulsation, motion, but can also be found in patients undergoing MRI examinations while receiving supplemental oxygen. Metallic and other foreign bodies which may be found on and in patients' bodies are the main group of artifacts and these are the focus of this study: e.g. make-up, tattoos, hairbands, clothes, endovascular embolization, prostheses, surgical clips, intraorbital and other medical implants, etc. Knowledge of different types of artifacts and their origin, and of possible foreign bodies is necessary to eliminate them or to reduce their negative influence on MR images by adjusting acquisition parameters. It is also necessary to take them into consideration when interpreting the images. Some proposals of reducing artifacts have been mentioned. Describing in detail the procedures to avoid or limit the artifacts would go beyond the scope of this paper but technical ways to reduce them can be found in the cited literature.
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Affiliation(s)
- Katarzyna Krupa
- Department of Diagnostic Imaging, Institute of Mother and Child, Warsaw, Poland
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Hassan Gamal G. Evaluation of spinal trauma by multi detector computed tomography and magnetic resonance imaging. THE EGYPTIAN JOURNAL OF RADIOLOGY AND NUCLEAR MEDICINE 2014. [DOI: 10.1016/j.ejrnm.2014.08.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Bagnato F, Ohayon JM, Ehrmantraut M, Chiu AW, Riva M, Ikonomidou VN. Clinical and imaging metrics for monitoring disease progression in patients with multiple sclerosis. Expert Rev Neurother 2014; 6:599-612. [PMID: 16623658 DOI: 10.1586/14737175.6.4.599] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Multiple sclerosis (MS) is an autoimmune disease of the CNS leading to clinical disability in 250,000-350,000 young adults in the USA and Europe. The disease affects both white matter (WM) and gray matter (GM) tissues of the brain and spinal cord. While WM disease is easily quantified using currently available magnetic resonance imaging (MRI) techniques, identification and quantification of GM disease present a daily challenge. Nonconventional brain and spinal cord MRI techniques, including magnetization transfer, MRI spectroscopy and diffusion tensor imaging, have improved our understanding of MS pathology in the deep GM. The sensitivity of high-resolution MRI obtained at a high magnetic field will improve the detection of spinal cord and brain cortical GM disease. The appropriate use of the above-mentioned techniques has the potential to more accurately explain the level of disability in MS patients.
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Affiliation(s)
- Francesca Bagnato
- Neuroimmunology Branch, NIND-NIH, 10 Center Drive, Building 10, Room 5B16, Bethesda, MD 20892-1400, USA.
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Agreement between magnetic resonance imaging, myelography, and surgery for detecting recurrent, thoracolumbar intervertebral disc extrusion in dogs. Vet Comp Orthop Traumatol 2012; 26:12-8. [PMID: 23172044 DOI: 10.3415/vcot-12-05-0067] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2012] [Accepted: 07/12/2012] [Indexed: 11/17/2022]
Abstract
OBJECTIVES Although magnetic resonance imaging (MRI) is reported to be superior to myelography to determine the location and site of first time disc herniation, comparison of these diagnostic methods in cases of recurrent intervertebral disc disease (IVD) herniation after a first surgery has not been evaluated. The objective was to compare the diagnostic accuracy of MRI and myelography in a series of dogs undergoing repeat surgical decompression for recurrent IVD extrusion when compared to the gold standard of surgery. METHODS Ten dogs with recurrent IVD herniation underwent MRI and myelography followed by surgical decompression. Three observers reviewed the images to determine the site and side of the first surgery and the recurrent lesion. Agreement was determined by calculating a kappa (κ) score. RESULTS Substantial interobserver agreement was noted for recurrent lesion site using MRI and myelography (κ = 0.77 vs. 0.73) and when comparing MRI and myelography to the reported surgical site (κ = 0.73 vs. 0.67). Interobserver agreement was greater with MRI for circumferential location compared to myelography (κ = 0.76 vs. 0.43), similar to what was found when comparing to surgical side (κ = 0.82 vs. 0.49). The previous surgical site in this study had no effect on ability to identify the new lesion. CLINICAL SIGNIFICANCE Despite the limitations of MRI, there was greater agreement between observers using MRI for both the recurrent and first lesion.
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Gliozzi AS, Mazzetti S, Delsanto PP, Regge D, Stasi M. Phenomenological universalities: a novel tool for the analysis of dynamic contrast enhancement in magnetic resonance imaging. Phys Med Biol 2011; 56:573-86. [PMID: 21212471 DOI: 10.1088/0031-9155/56/3/004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Dynamic contrast enhancement in magnetic resonance imaging (DCE-MRI) is a promising tool for the clinical diagnosis of tumors, whose implementation may be improved through the use of suitable hemodynamic models. If one prefers to avoid assumptions about the tumor physiology, empirical fitting functions may be adopted. For this purpose, in this paper we discuss the exploitation of a recently proposed phenomenological universalities (PUN) formalism. In fact, we show that a novel PUN class may be used to describe the time-signal intensity curves in both healthy and tumoral tissues, discriminating between the two cases and thus potentially providing a convenient diagnostic tool. The proposed approach is applied to analysis of the DCE-MRI data relative to a study group composed of ten patients with spine tumors.
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Affiliation(s)
- A S Gliozzi
- Physics Department, Politecnico di Torino, Torino, Italy.
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Nance JR, Golomb MR. Ischemic spinal cord infarction in children without vertebral fracture. Pediatr Neurol 2007; 36:209-16. [PMID: 17437902 PMCID: PMC2001276 DOI: 10.1016/j.pediatrneurol.2007.01.006] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2006] [Accepted: 01/08/2007] [Indexed: 11/22/2022]
Abstract
Spinal cord infarction in children is a rare condition that is becoming more widely recognized. There are few reports in the pediatric literature characterizing etiology, diagnosis, treatment, and prognosis. The risk factors for pediatric ischemic spinal cord infarction include obstruction of blood flow associated with cardiovascular compromise or malformation, iatrogenic or traumatic vascular injury, cerebellar herniation, thrombotic or embolic disease, infection, and vasculitis. In many children, the cause of spinal cord ischemia in the absence of vertebral fracture is unknown. Imaging diagnosis of spinal cord ischemia is often difficult, due to the small transverse area of the cord, cerebrospinal fluid artifact, and inadequate resolution of magnetic resonance imaging. Physical therapy is the most important treatment option. The prognosis is dependent on the level of spinal cord damage, early identification and reversal of ischemia, and follow-up with intensive physical therapy and medical support. In addition to summarizing the literature regarding spinal cord infarction in children without vertebral fracture, this review article adds two cases to the literature that highlight the difficulties and controversies in the management of this condition.
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Affiliation(s)
- Jessica R Nance
- Division of Pediatric Neurology, Department of Neurology, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA
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