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Bodanapally UK, Aarabi B, Liang Y, Khalid M, Fleiter TR, Gandhi D. Quantitative DECT of Iodine in Chronic Subdural Hematoma as Surrogate of Membrane Exudation: A Pilot Feasibility Study. J Comput Assist Tomogr 2023; 47:951-958. [PMID: 37948371 DOI: 10.1097/rct.0000000000001501] [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: 07/23/2023]
Abstract
OBJECTIVE We explore the feasibility to estimate the exudation from chronic subdural hematoma (CSDH) membranes, by using dual-energy computed tomography (DECT) quantification of iodine leak and test if the derived quantitative variables and membrane morphology correlates with hematoma volume, internal architecture (homogeneous, laminar, separated, and trabecular types), and fractional hyperdense hematoma at presentation. METHODS In this retrospective study, consecutive CSDH patients with postcontrast DECT head images from January 2020 and June 2021 were analyzed. Predictor variables derived from DECT were correlated with outcome variables followed by mixed-effects regression analysis. RESULTS The study included 36 patients with 50 observations (mean age, 72.6 years; standard deviation, 11.6 years); 31 were men. Dual-energy CT variables that correlated with hematoma volume were external membrane volume (ρ, 0.37; P = 0.008) and iodine concentration (ρ, -0.29; P = 0.04). Variables that correlated with separated type of hematoma were total iodine leak (median [Q 1 , Q 3 ], 68.3 mg [48.5, 88.9] vs 38.8 mg [15.5, 62.9]; P = 0.001) and iodine leak per unit membrane volume (median [Q 1 , Q 3 ], 16.47 mg/mL [10.19, 20.65] vs 8.68 mg/mL [5.72, 11.41]; P = 0.002). Membrane grade was the only variable that correlated with fractional hyperdense hematoma (ρ, 0.28; P = 0.05). Regression analysis showed total iodine leak as the strongest predictor of separated type hematoma (odds ratio [95% confidence interval], 1.06 per mg [1.01, 1.1]). CONCLUSIONS Dual-energy CT demonstrates iodine leak from CSDH membranes. The variables derived from DECT correlated with hematoma volume, internal architecture, and fractional hyperdense hematoma.
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Affiliation(s)
| | | | | | - Mazhar Khalid
- Department of Neurology, University of Maryland School of Medicine, Baltimore, MD
| | | | - Dheeraj Gandhi
- From the Department of Diagnostic Radiology and Nuclear Medicine
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Multi-Energy CT Applications. Radiol Clin North Am 2023; 61:1-21. [DOI: 10.1016/j.rcl.2022.08.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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3
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Posttraumatic Headaches and Postcraniotomy Syndromes. Neurol Clin 2022; 40:609-629. [PMID: 35871787 DOI: 10.1016/j.ncl.2022.02.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Headaches following head trauma or craniotomy have multiple causes, each of which has characteristic imaging features. Posttraumatic headaches may relate to intracranial hemorrhage, fracture, shear injury, mass effect, or vascular injury. Various complications of craniotomy and craniectomy may manifest with headache. CT and MRI of the brain play important roles in diagnosing these causes of headache.
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Sogano J, Mizutani K, Shibao S, Tomita H. How to distinguish confusing clinical entities; acute subdural hematoma and enhanced subdural effusions after an endovascular procedure? INTERDISCIPLINARY NEUROSURGERY 2021. [DOI: 10.1016/j.inat.2021.101335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Gaddam DS, Dattwyler M, Fleiter TR, Bodanapally UK. Principles and Applications of Dual Energy Computed Tomography in Neuroradiology. Semin Ultrasound CT MR 2021; 42:418-433. [PMID: 34537112 DOI: 10.1053/j.sult.2021.07.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Dual-energy computed tomography (DE CT) is a promising tool with many current and evolving applications. Available DE CT scanners usually consist of one or two tubes, or use layered detectors for spectral separation. Most DE CT scanners can be used in single energy or dual-energy mode, except for the layered detector scanners that always acquire data in dual-energy mode. However, the layered detector scanners can retrospectively integrate the data from two layers to obtain conventional single energy images. DE CT mode enables generation of virtual monochromatic images, blended images, iodine quantification, improving conspicuity of iodinated contrast enhancement, and material decomposition maps or more sophisticated quantitative analysis not possible with conventional SE CT acquisition with an acceptable or even lower dose than the SE CT. This article reviews the basic principles of dual-energy CT and highlights many of its clinical applications in the evaluation of neurological conditions.
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Affiliation(s)
- Durga Sivacharan Gaddam
- Department of Diagnostic Radiology and Nuclear Medicine, R Adams Cowley Shock Trauma Center, University of Maryland School of Medicine, 22 S. Greene Street, Baltimore, MD
| | - Matthew Dattwyler
- Department of Diagnostic Radiology and Nuclear Medicine, R Adams Cowley Shock Trauma Center, University of Maryland School of Medicine, 22 S. Greene Street, Baltimore, MD
| | - Thorsten R Fleiter
- Department of Diagnostic Radiology and Nuclear Medicine, R Adams Cowley Shock Trauma Center, University of Maryland School of Medicine, 22 S. Greene Street, Baltimore, MD
| | - Uttam K Bodanapally
- Department of Diagnostic Radiology and Nuclear Medicine, R Adams Cowley Shock Trauma Center, University of Maryland School of Medicine, 22 S. Greene Street, Baltimore, MD.
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Wang P, Tang Z, Xiao Z, Hong R, Wang R, Wang Y, Zhan Y. Dual-energy CT in differentiating benign sinonasal lesions from malignant ones: comparison with simulated single-energy CT, conventional MRI, and DWI. Eur Radiol 2021; 32:1095-1105. [PMID: 34427744 DOI: 10.1007/s00330-021-08159-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 06/11/2021] [Accepted: 06/15/2021] [Indexed: 12/21/2022]
Abstract
OBJECTIVES To explore the value of dual-energy CT (DECT) for differentiating benign sinonasal lesions from malignant ones, and to compare this finding with simulated single-energy CT (SECT), conventional MRI (cMRI), and diffusion-weighted imaging (DWI). METHODS Patients with sinonasal lesions (38 benign and 34 malignant) who were confirmed by histopathology underwent DECT, cMRI, and DWI. DECT-derived parameters (iodine concentration (IC), effective atomic number (Eff-Z), 40-180 keV (20-keV interval), virtual non-enhancement (VNC), slope (k), and linear-mixed 0.3 (Mix-0.3)), DECT morphological features, cMRI characteristics, and ADC value of benign and malignant tumors were compared using t test or chi-square test. Receiver operating characteristic (ROC) curve was performed to evaluate the diagnostic performance, and the area under the ROC curve (AUC) was compared using the Z test to select the optimal diagnostic approach. RESULTS Significantly higher DECT-derived single parameters (IC, Eff-Z, 40 keV, 60 keV, 80 keV, slope (k), Mix-0.3) were found in malignant lesions than those of benign sinonasal lesions (all p < 0.004, Bonferroni correction). Combined quantitative parameters (IC, Eff-Z, 40 keV, 60 keV, 80 keV, slope (k)) can improve the diagnostic efficiency for discriminating these two entities. Combination of DECT quantitative parameters and morphological features can further improve the overall diagnostic performance, with AUC, sensitivity, specificity, and accuracy of 0.935, 96.67%, 90.00%, and 93.52%. Moreover, the AUC of DECT was higher than those of Mix-0.3 (simulated SECT), cMRI, DWI, and cMRI+DWI. CONCLUSIONS Compared with simulated SECT, cMRI, and DWI, DECT appears to be a more accurate imaging technique for differentiating benign from malignant sinonasal lesions. KEY POINTS • DE can differentiate benign sinonasal lesions from malignant ones based on DECT-derived qualitative parameters. • DECT appears to be more accurate in the diagnosis of sinonasal lesions when compared with simulated SECT, cMRI, and DWI.
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Affiliation(s)
- Peng Wang
- Department of Radiology, Eye & ENT Hospital of Shanghai Medical School, Fudan University, 83 Fenyang Road, Shanghai, 200031, People's Republic of China.,Department of Radiology, The Affiliated Renmin Hospital of Jiangsu University, Zhenjiang, Jiangsu, 212002, People's Republic of China
| | - Zuohua Tang
- Department of Radiology, Eye & ENT Hospital of Shanghai Medical School, Fudan University, 83 Fenyang Road, Shanghai, 200031, People's Republic of China.
| | - Zebin Xiao
- Department of Radiology, Eye & ENT Hospital of Shanghai Medical School, Fudan University, 83 Fenyang Road, Shanghai, 200031, People's Republic of China.,Department of Biomedical Sciences, University of Pennsylvania, Philadelphia, 19104, USA
| | - Rujian Hong
- Department of Radiology, Eye & ENT Hospital of Shanghai Medical School, Fudan University, 83 Fenyang Road, Shanghai, 200031, People's Republic of China
| | - Rong Wang
- The Shanghai Institution of Medical Imaging, Zhongshan Hospital, Fudan University, Shanghai, 200032, People's Republic of China
| | - Yuzhe Wang
- Department of Radiology, Eye & ENT Hospital of Shanghai Medical School, Fudan University, 83 Fenyang Road, Shanghai, 200031, People's Republic of China
| | - Yang Zhan
- The Shanghai Institution of Medical Imaging, Zhongshan Hospital, Fudan University, Shanghai, 200032, People's Republic of China
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7
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Bordia R, Le M, Behbahani S. Pitfalls in the diagnosis of subdural hemorrhage - Mimics and uncommon causes. J Clin Neurosci 2021; 89:71-84. [PMID: 34119298 DOI: 10.1016/j.jocn.2021.02.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 01/17/2021] [Accepted: 02/06/2021] [Indexed: 10/21/2022]
Abstract
PURPOSE Subdural hemorrhage (SDH), the accumulation of blood between the dura and arachnoid mater, is one of the most commonly encountered traumatic findings in emergency radiology setting. The purpose of this essay is to review the pitfalls in the diagnosis of SDH including a) mimics on CT imaging and b) etiology other than accidental trauma. We describe several entities that closely mimic SDH on non-contrast CT scans. A knowledge of these mimics is essential in the emergency setting since overdiagnosis of SDH can lead to unnecessary hospital admissions, potentially invasive procedures, or even delay in necessary treatment. The mimics of SDH on non-contrast head CT include: PATHOLOGIC ENTITIES IATROGENIC MIMICS ANATOMIC/PHYSIOLOGIC MIMICS ARTIFACTUAL MIMICSWe also briefly review non-accidental and non-traumatic causes of SDH. Although, the most common cause of SDH is accidental trauma, other routinely encountered causes of SDH include coagulopathy, non-accidental trauma, cranial surgery, vascular malformations etc. CONCLUSION: Clinicians dealing with SDH in the emergency setting should consider SDH mimics and less common etiologies of SDH in order to facilitate appropriate patient management.
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Affiliation(s)
- Ritu Bordia
- Department of Radiology, NYU Winthrop Hospital, 259 First Street, Mineola, NY 11501, USA.
| | - Megan Le
- Department of Radiology, NYU Winthrop Hospital, 259 First Street, Mineola, NY 11501, USA.
| | - Siavash Behbahani
- Department of Radiology, NYU Winthrop Hospital, 259 First Street, Mineola, NY 11501, USA
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Sandhu R, Aslan M, Obuchowski N, Primak A, Karim W, Subhas N. Dual-energy CT arthrography: a feasibility study. Skeletal Radiol 2021; 50:693-703. [PMID: 32948903 DOI: 10.1007/s00256-020-03603-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 09/08/2020] [Accepted: 09/10/2020] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To evaluate the feasibility of producing 2-dimensional (2D) virtual noncontrast images and 3-dimensional (3D) bone models from dual-energy computed tomography (DECT) arthrograms and to determine whether this is best accomplished using 190 keV virtual monoenergetic images (VMI) or virtual unenhanced (VUE) images. MATERIALS AND METHODS VMI and VUE images were retrospectively reconstructed from patients with internal derangement of the shoulder or knee joint who underwent DECT arthrography between September 2017 and August 2019. A region of interest was placed in the area of brightest contrast, and the mean attenuation (in Hounsfield units [HUs]) was recorded. Two blinded musculoskeletal radiologists qualitatively graded the 2D images and 3D models using scores ranging from 0 to 3 (0 considered optimal). RESULTS Twenty-six patients (mean age ± SD, 57.5 ± 16.8 years; 6 women) were included in the study. The contrast attenuation on VUE images (overall mean ± SD, 10.5 ± 16.4 HU; knee, 19.3 ± 10.7 HU; shoulder, 5.0 ± 17.2 HU) was significantly lower (p < 0.001 for all comparisons) than on VMI (overall mean ± SD, 107.7 ± 43.8 HU; knee, 104.6 ± 31.1 HU; shoulder, 109.6 ± 51.0 HU). The proportion of cases with optimal scores (0 or 1) was significantly higher with VUE than with VMI for both 2D and 3D images (p < 0.001). CONCLUSIONS DECT arthrography can be used to produce 2D virtual noncontrast images and to generate 3D bone models. The VUE technique is superior to VMI in producing virtual noncontrast images.
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Affiliation(s)
- Rashpal Sandhu
- Imaging Institute, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - Mercan Aslan
- Imaging Institute, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - Nancy Obuchowski
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - Andrew Primak
- Siemens Medical Solutions USA, Inc., Malvern, PA, 19355, USA
| | - Wadih Karim
- Imaging Institute, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - Naveen Subhas
- Imaging Institute, Cleveland Clinic, Cleveland, OH, 44195, USA.
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Hamid S, Nasir MU, So A, Andrews G, Nicolaou S, Qamar SR. Clinical Applications of Dual-Energy CT. Korean J Radiol 2021; 22:970-982. [PMID: 33856133 PMCID: PMC8154785 DOI: 10.3348/kjr.2020.0996] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 11/16/2020] [Accepted: 11/22/2020] [Indexed: 01/05/2023] Open
Abstract
Dual-energy CT (DECT) provides insights into the material properties of tissues and can differentiate between tissues with similar attenuation on conventional single-energy imaging. In the conventional CT scanner, differences in the X-ray attenuation between adjacent structures are dependent on the atomic number of the materials involved, whereas in DECT, the difference in the attenuation is dependent on both the atomic number and electron density. The basic principle of DECT is to obtain two datasets with different X-ray energy levels from the same anatomic region and material decomposition based on attenuation differences at different energy levels. In this article, we discuss the clinical applications of DECT and its potential robust improvements in performance and postprocessing capabilities.
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Affiliation(s)
- Saira Hamid
- Department of Radiology, University of British Columbia Hospital, University of British Columbia, Vancouver, Canada.
| | - Muhammad Umer Nasir
- Department of Medical Imaging, Vancouver General Hospital, University of British Columbia, Vancouver, Canada
| | - Aaron So
- Department of Medical Biophyics, Schulich School of Medicine and Dentistry Western University London, Ontario, Canada
| | - Gordon Andrews
- Department of Radiology, University of British Columbia Hospital, University of British Columbia, Vancouver, Canada
| | - Savvas Nicolaou
- Department of Medical Imaging, Vancouver General Hospital, University of British Columbia, Vancouver, Canada
| | - Sadia Raheez Qamar
- Department of Medical Imaging, Sunnybrook Hospital, University of Toronto, Toronto, Canada
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10
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Schweitzer AD, Niogi SN, Whitlow CT, Tsiouris AJ. Traumatic Brain Injury: Imaging Patterns and Complications. Radiographics 2020; 39:1571-1595. [PMID: 31589576 DOI: 10.1148/rg.2019190076] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
While the diagnosis of traumatic brain injury (TBI) is a clinical decision, neuroimaging remains vital for guiding management on the basis of identification of intracranial pathologic conditions. CT is the mainstay of imaging of acute TBI for both initial triage and follow-up, as it is fast and accurate in detecting both primary and secondary injuries that require neurosurgical intervention. MRI is more sensitive for the detection of certain intracranial injuries (eg, axonal injuries) and blood products 24-48 hours after injury, but it has limitations (eg, speed, accessibility, sensitivity to motion, and cost). The evidence primarily supports the use of MRI when CT findings are normal and there are persistent unexplained neurologic findings or at subacute and chronic periods. Radiologists should understand the role and optimal imaging modality to use, in addition to patterns of primary brain injury and their influence on the risk of developing secondary brain injuries related to herniation. ©RSNA, 2019 See discussion on this article by Mathur and Nicolaou.
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Affiliation(s)
- Andrew D Schweitzer
- From the Department of Radiology, Weill Cornell Medicine/New York-Presbyterian Hospital, 525 E 68th St, Starr 630C, New York, NY 10075 (A.D.S., S.N.N., A.J.T.); and Department of Radiology, Wake Forest School of Medicine, Winston-Salem, N.C. (C.T.W.)
| | - Sumit N Niogi
- From the Department of Radiology, Weill Cornell Medicine/New York-Presbyterian Hospital, 525 E 68th St, Starr 630C, New York, NY 10075 (A.D.S., S.N.N., A.J.T.); and Department of Radiology, Wake Forest School of Medicine, Winston-Salem, N.C. (C.T.W.)
| | - Christopher T Whitlow
- From the Department of Radiology, Weill Cornell Medicine/New York-Presbyterian Hospital, 525 E 68th St, Starr 630C, New York, NY 10075 (A.D.S., S.N.N., A.J.T.); and Department of Radiology, Wake Forest School of Medicine, Winston-Salem, N.C. (C.T.W.)
| | - A John Tsiouris
- From the Department of Radiology, Weill Cornell Medicine/New York-Presbyterian Hospital, 525 E 68th St, Starr 630C, New York, NY 10075 (A.D.S., S.N.N., A.J.T.); and Department of Radiology, Wake Forest School of Medicine, Winston-Salem, N.C. (C.T.W.)
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11
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Dual-energy CT for differentiating acute intracranial hemorrhage from contrast staining or calcification: a meta-analysis. Neuroradiology 2020; 62:1617-1626. [PMID: 32621024 DOI: 10.1007/s00234-020-02486-w] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 06/22/2020] [Indexed: 10/23/2022]
Abstract
PURPOSE This study aimed to comprehensively evaluate the diagnostic performance of dual-energy CT (DECT) for differentiating acute intracranial hemorrhage (ICH) from contrast staining or small calcifications via a systematic review and meta-analysis. METHODS The PubMed-MEDLINE, EMBASE, and Cochrane Library databases were searched up to November 10, 2019. Original studies (prospective or retrospective cohort studies) with the primary aim of detecting ICH using DECT were selected. The diagnostic performance of DECT was assessed using bivariate and hierarchical summary receiver operating characteristic models. Quality assessment was performed according to the Quality Assessment of Diagnostic Accuracy Studies-2, while between-study heterogeneity was assessed using Higgins' inconsistency index (I2). To explore heterogeneity, subgroup meta-regression analyses were performed. Deeks' funnel plot asymmetry test was used for assessing publication bias. RESULTS Nine studies comprising 402 patients with 453 lesions were included for data synthesis. The overall pooled sensitivity and specificity of DECT for ICH detection were 96% (95% CI, 77-99%) and 98% (95 CI, 93%-100%), respectively. Substantial and moderate between-study heterogeneities were observed for sensitivity (I2 = 90.3%) and specificity (I2 = 57.9%), respectively. In meta-regression analysis, type of cohort affected heterogeneity-studies including only stroke patients showed lower sensitivity (43.5% vs. 94.2%) but higher specificity (98.7% vs. 92.6%) than those with mixed etiologies (P < 0.001). Deeks' funnel plot asymmetry test revealed publication bias (P = 0.020). CONCLUSION DECT demonstrated excellent diagnostic performance in terms of differentiating acute ICH from contrast staining and small calcifications. However, publication bias suggests the possibility of overestimated diagnostic performance, warranting large-scale, prospective cohort studies.
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Yan WT, Li XZ, Yan CX, Liu JC. Typical subdural contrast effusion secondary to endovascular treatment of a pediatric pial arteriovenous fistula. Interv Neuroradiol 2020; 27:31-36. [PMID: 32611214 DOI: 10.1177/1591019920938965] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Subdural contrast effusion secondary to endovascular treatment is exceptionally rare and might be mistaken as subdural hematoma because of similar hyperattenuation on computer tomography. The authors present the case of a 13-month-old girl with a history of increased head circumference and developmental retardation. Cerebral digital subtraction angiography showed a high-flow pial arteriovenous fistula fed by multiple arteries on the right cerebellar surface, with occlusion of the right sigmoid sinus and severe stenosis of the left sigmoid sinus. Staged endovascular treatments were performed to eliminate the fistula. Follow-up head computer tomography scans performed 3 h after both procedures demonstrated typical high-density subdural effusion with computer tomography attenuation value similar to hemorrhage. These effusions did not aggravate the condition and disappeared spontaneously 32 h after the first treatment and 29 h after the second, respectively.
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Affiliation(s)
- Wen-Tao Yan
- Department of Neurosurgery, 455994Capital Medical University Sanbo Brain Hospital, Beijing, China
| | - Xiu-Zhen Li
- Department of Neurosurgery, 455994Capital Medical University Sanbo Brain Hospital, Beijing, China
| | - Chang-Xiang Yan
- Department of Neurosurgery, 455994Capital Medical University Sanbo Brain Hospital, Beijing, China
| | - Jia-Chun Liu
- Department of Neurosurgery, 455994Capital Medical University Sanbo Brain Hospital, Beijing, China
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Gibney B, Redmond CE, Byrne D, Mathur S, Murray N. A Review of the Applications of Dual-Energy CT in Acute Neuroimaging. Can Assoc Radiol J 2020; 71:253-265. [PMID: 32106693 DOI: 10.1177/0846537120904347] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Dual-energy computed tomography (CT) is a promising tool with increasing availability and multiple emerging and established clinical applications in neuroradiology. With its ability to allow characterization of materials based on their differential attenuation when imaged at two different energy levels, dual-energy CT can help identify the composition of brain, neck, and spinal components. Virtual monoenergetic imaging allows a range of simulated single energy-level reconstructions to be created with postprocessing. Low-energy reconstructions can aid identification of edema, ischemia, and subtle lesions due to increased soft tissue contrast as well as increasing contrast-to-noise ratios on angiographic imaging. Higher energy reconstructions can reduce image artifact from dental amalgam, aneurysm clips and coils, spinal hardware, dense contrast, and dense bones. Differentiating iodine from hemorrhage may help guide management of patients after thrombectomy and aid diagnosis of enhancing tumors within parenchymal hemorrhages. Iodine quantification may predict hematoma expansion in aneurysmal bleeds and outcomes in traumatic brain injury. Calcium and bone subtraction can be used to distinguish hemorrhage from brain parenchymal mineralization as well as improving visualization of extra-axial lesions and vessels adjacent to dense plaque or skull. This article reviews the basics of dual-energy CT and highlights many of its clinical applications in the evaluation of acute neurological presentations.
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Affiliation(s)
- Brian Gibney
- Division of Emergency Radiology, Vancouver General Hospital, Vancouver, British Columbia, Canada
| | - Ciaran E Redmond
- Division of Emergency Radiology, Vancouver General Hospital, Vancouver, British Columbia, Canada
| | - Danielle Byrne
- Division of Neuroradiology, Vancouver General Hospital, Vancouver, British Columbia, Canada
| | - Shobhit Mathur
- Department of Medical Imaging, St Michael's Hospital, University of Toronto, Toronto, Ontario, Canada
| | - Nicolas Murray
- Division of Emergency Radiology, Vancouver General Hospital, Vancouver, British Columbia, Canada
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Bodanapally UK, Shanmuganathan K, Parikh GY, Schwartzbauer G, Kondaveti R, Feiter TR. Quantification of Iodine Leakage on Dual-Energy CT as a Marker of Blood-Brain Barrier Permeability in Traumatic Hemorrhagic Contusions: Prediction of Surgical Intervention for Intracranial Pressure Management. AJNR Am J Neuroradiol 2019; 40:2059-2065. [PMID: 31727752 PMCID: PMC6975368 DOI: 10.3174/ajnr.a6316] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Accepted: 09/30/2019] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Hemorrhagic contusions are associated with iodine leakage. We aimed to identify quantitative iodine-based dual-energy CT variables that correlate with the type of intracranial pressure management. MATERIALS AND METHODS Consecutive patients with contusions from May 2016 through January 2017 were retrospectively analyzed. Radiologists, blinded to the outcomes, evaluated CT variables from unenhanced admission and short-term follow-up head dual-energy CT scans obtained after contrast-enhanced whole-body CT. Treatment intensity of intracranial pressure was broadly divided into 2 groups: those managed medically and those managed surgically. Univariable analysis followed by logistic regression was used to develop a prediction model. RESULTS The study included 65 patients (50 men; median age, 48 years; Q1 to Q3, 25-65.5 years). Twenty-one patients were managed surgically (14 by CSF drainage, 7 by craniectomy). Iodine-based variables that correlated with surgical management were higher iodine concentration, pseudohematoma volume, iodine quantity in pseudohematoma, and iodine quantity in contusions. The regression model developed after inclusion of clinical variables identified 3 predictor variables: postresuscitation Glasgow Coma Scale (adjusted OR = 0.55; 95% CI, 0.38-0.79; P = .001), age (adjusted OR = 0.9; 95% CI, 0.85-0.97; P = .003), and pseudohematoma volume (adjusted OR = 2.05; 95% CI, 1.1-3.77; P = .02), which yielded an area under the curve of 0.96 in predicting surgical intracranial pressure management. The 2 predictors for craniectomy were age (adjusted OR = 0.89; 95% CI, 0.81-0.99; P = .03) and pseudohematoma volume (adjusted OR = 1.23; 95% CI, 1.03-1.45; P = .02), which yielded an area under the curve of 0.89. CONCLUSIONS Quantitative iodine-based parameters derived from follow-up dual-energy CT may predict the intensity of intracranial pressure management in patients with hemorrhagic contusions.
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Affiliation(s)
- U K Bodanapally
- From the Departments of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., T.R.F.)
| | - K Shanmuganathan
- From the Departments of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., T.R.F.)
| | | | - G Schwartzbauer
- Neurosurgery (G.S.), R Adams Cowley Shock Trauma Center, University of Maryland School of Medicine, Baltimore, Maryland
| | - R Kondaveti
- Kasturba Medical College (R.K.), Mangaluru, India
| | - T R Feiter
- From the Departments of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., T.R.F.)
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15
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Dahl RH, Eskesen V, Benndorf G. Subdural contrast effusion during endovascular therapy: case report. Acta Neurochir (Wien) 2019; 161:2403-2407. [PMID: 31506726 DOI: 10.1007/s00701-019-04049-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Accepted: 08/22/2019] [Indexed: 12/01/2022]
Abstract
Accumulation of contrast medium in the subdural space after diagnostic intraarterial contrast administration is a rare observation. The authors report the case of a subdural contrast effusion (SCE) presenting during endovascular treatment of an intracranial dural arteriovenous fistula (DAVF) mimicking an acute subdural hematoma. Differentiation between the two by computed tomography (CT) or intraprocedural Dyna CT and early neurological examination can be crucial for patient management. We believe that repeated large-volume contrast injections via large-bore intermediate catheters into the territory of an (even partly) occluded DAVF may induce leakage of contrast medium into the extravascular subdural space thereby causing a SCE.
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Affiliation(s)
- Rasmus Holmboe Dahl
- Department of Radiology, University Hospital Rigshospitalet, Copenhagen, Denmark
- Department of Neurology, Aalborg University Hospital, Aalborg, Denmark
| | - Vagn Eskesen
- Department of Neurosurgery, University Hospital Rigshospitalet, Copenhagen, Denmark
| | - Goetz Benndorf
- Department of Radiology, University Hospital Rigshospitalet, Copenhagen, Denmark.
- Department of Radiology, Baylor College of Medicine, Houston, TX, USA.
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Albrecht MH, Vogl TJ, Martin SS, Nance JW, Duguay TM, Wichmann JL, De Cecco CN, Varga-Szemes A, van Assen M, Tesche C, Schoepf UJ. Review of Clinical Applications for Virtual Monoenergetic Dual-Energy CT. Radiology 2019; 293:260-271. [DOI: 10.1148/radiol.2019182297] [Citation(s) in RCA: 71] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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Reimer RP, Flatten D, Lichtenstein T, Zopfs D, Neuhaus V, Kabbasch C, Maintz D, Borggrefe J, Große Hokamp N. Virtual Monoenergetic Images from Spectral Detector CT Enable Radiation Dose Reduction in Unenhanced Cranial CT. AJNR Am J Neuroradiol 2019; 40:1617-1623. [PMID: 31537517 DOI: 10.3174/ajnr.a6220] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Accepted: 08/05/2019] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Our aim was to evaluate whether improved gray-white matter differentiation in cranial CT by means of 65- keV virtual monoenergetic images enables a radiation dose reduction compared to conventional images. MATERIALS AND METHODS One hundred forty consecutive patients undergoing 171 spectral detector CTs of the head between February and November 2017 (56 ± 19 years of age; male/female ratio, 56%/44%) were retrospectively included. The tube current-time product was reduced during the study period, resulting in 61, 55, and 55 patients being examined with 320, 290, and 260 mAs, respectively. All other scanning parameters were kept identical. The volume CT dose index was recorded. ROIs were placed in gray and white matter on conventional images and copied to identical positions in 65- keV virtual monoenergetic images. The contrast-to-noise ratio was calculated. Two radiologists blinded to the reconstruction technique evaluated image quality on a 5-point Likert-scale. Statistical assessment was performed using ANOVA and Wilcoxon test adjusted for multiple comparisons. RESULTS The mean volume CT dose index was 55, 49.8, and 44.7 mGy using 320, 290, and 260 mAs, respectively. Irrespective of the volume CT dose index, noise was significantly lower in 65- keV virtual monoenergetic images compared with conventional images (65- keV virtual monoenergetic images/conventional images: extraocular muscle with 49.8 mGy, 3.7 ± 1.3/5.6 ± 1.6 HU, P < .001). Noise slightly increased with a reduced radiation dose (eg, extraocular muscle in conventional images: 5.3 ± 1.4/5.6 ± 1.6/6.1 ± 2.1 HU). Overall, the contrast-to-noise ratio in 65- keV virtual monoenergetic images was superior to that in conventional images irrespective of the volume CT dose index (P < .001). Particularly, 65-keV virtual monoenergetic images with 44.7 mGy showed significantly lower noise and a higher contrast-to-noise ratio than conventional images with 55 mGy (P < .001). Subjective analysis confirmed better image quality in 65- keV virtual monoenergetic images, even using 44.7 mGy. CONCLUSIONS The 65-keV virtual monoenergetic images from spectral detector CT allow radiation dose reduction in cranial CT. While this proof of concept included a radiation dose reduction of 19%, our data suggest that even greater reduction appears achievable.
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Affiliation(s)
- R P Reimer
- From the Department of Diagnostic and Interventional Radiology, University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany
| | - D Flatten
- From the Department of Diagnostic and Interventional Radiology, University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany
| | - T Lichtenstein
- From the Department of Diagnostic and Interventional Radiology, University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany
| | - D Zopfs
- From the Department of Diagnostic and Interventional Radiology, University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany
| | - V Neuhaus
- From the Department of Diagnostic and Interventional Radiology, University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany
| | - C Kabbasch
- From the Department of Diagnostic and Interventional Radiology, University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany
| | - D Maintz
- From the Department of Diagnostic and Interventional Radiology, University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany
| | - J Borggrefe
- From the Department of Diagnostic and Interventional Radiology, University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany
| | - N Große Hokamp
- From the Department of Diagnostic and Interventional Radiology, University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany.
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Talbott JF, Hess CP. Is Dual-Energy CT Ready for Prime Time in Traumatic Brain Injury? Radiology 2019; 292:739-740. [DOI: 10.1148/radiol.2019191528] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jason F. Talbott
- From the Department of Radiology and Biomedical Imaging (J.F.T., C.P.H.), Brain and Spinal Injury Center (J.F.T.), and Department of Neurology (C.P.H.), University of California, San Francisco, 505 Parnassus Ave, M392, San Francisco, CA 94143; and Department of Radiology and Biomedical Imaging, Zuckerberg San Francisco General Hospital and Trauma Center, San Francisco, Calif (J.F.T.)
| | - Christopher P. Hess
- From the Department of Radiology and Biomedical Imaging (J.F.T., C.P.H.), Brain and Spinal Injury Center (J.F.T.), and Department of Neurology (C.P.H.), University of California, San Francisco, 505 Parnassus Ave, M392, San Francisco, CA 94143; and Department of Radiology and Biomedical Imaging, Zuckerberg San Francisco General Hospital and Trauma Center, San Francisco, Calif (J.F.T.)
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Bodanapally UK, Shanmuganathan K, Ramaswamy M, Tsymbalyuk S, Aarabi B, Parikh GY, Schwartzbauer G, Dreizin D, Simard JM, Ptak T, Li G, Liang Y, Fleiter TR. Iodine-based Dual-Energy CT of Traumatic Hemorrhagic Contusions: Relationship to In-Hospital Mortality and Short-term Outcome. Radiology 2019; 292:730-738. [PMID: 31361206 DOI: 10.1148/radiol.2019190078] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
BackgroundTraumatic hemorrhagic contusions are associated with iodine leak; however, quantification of leakage and its importance to outcome is unclear.PurposeTo identify iodine-based dual-energy CT variables that correlate with in-hospital mortality and short-term outcomes for contusions at hospital discharge.Materials and MethodsIn this retrospective study, consecutive patients with contusions from May 2016 through January 2017 were analyzed. Two radiologists evaluated CT variables from unenhanced admission head CT and follow-up head dual-energy CT scans obtained after contrast material-enhanced whole-body CT. The outcomes evaluated were in-hospital mortality, Rancho Los Amigos scale (RLAS) score, and disability rating scale (DRS) score. Logistic regression and linear regression were used to develop prediction models for categorical and continuous outcomes, respectively.ResultsThe study included 65 patients (median age, 48 years; interquartile range, 25-65.5 years); 50 were men. Dual-energy CT variables that correlated with mortality, RLAS score, and DRS score were iodine concentration, pseudohematoma volume, iodine quantity in pseudohematoma, and iodine quantity in contusion. The single-energy CT variable that correlated with mortality, RLAS score, and DRS score was hematoma volume at follow-up CT. Multiple logistic regression analysis after inclusion of clinical variables identified two predictors that enabled determination of mortality: postresuscitation Glasgow coma scale (P-GCS) (adjusted odds ratio, 0.42; 95% confidence interval [CI]: 0.2, 0.86; P = 0.01) and iodine quantity in pseudohematoma (adjusted odds ratio, 1.4 per milligram; 95% CI: 1.02 per milligram, 1.9 per milligram; P = 0.03), with a mean area under the receiver operating characteristic curve of 0.96 ± 0.05 (standard error). For RLAS, the predictors were P-GCS (mean coefficient, 0.32 ± 0.06; P < .001) and iodine quantity in contusion (mean coefficient, -0.04 per milligram ± 0.02; P = 0.01). Predictors for DRS were P-GCS (mean coefficient, -1.15 ± 0.27; P < .001), age (mean coefficient, 0.13 per year ± 0.04; P = .002), and iodine quantity in contusion (mean coefficient, 0.19 per milligram ± 0.07; P = .02).ConclusionIodine-based dual-energy CT variables correlate with in-hospital mortality and short-term outcomes for contusions at hospital discharge.© RSNA, 2019Online supplemental material is available for this article.See also the editorial by Talbott and Hess in this issue.
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Affiliation(s)
- Uttam K Bodanapally
- From the Departments of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., D.D., T.P., G.L., T.R.F.), Neurosurgery (B.A., G.S., M.S.), Neurology, R. Adams Cowley Shock Trauma Center (Y.G.P.), Epidemiology and Public Health (Y.L.), University of Maryland School of Medicine, 22 S Greene St, Baltimore, MD 21201; and University of Maryland School of Medicine, Baltimore, Md (M.R., S.T.)
| | - Kathirkamanathan Shanmuganathan
- From the Departments of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., D.D., T.P., G.L., T.R.F.), Neurosurgery (B.A., G.S., M.S.), Neurology, R. Adams Cowley Shock Trauma Center (Y.G.P.), Epidemiology and Public Health (Y.L.), University of Maryland School of Medicine, 22 S Greene St, Baltimore, MD 21201; and University of Maryland School of Medicine, Baltimore, Md (M.R., S.T.)
| | - Meghna Ramaswamy
- From the Departments of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., D.D., T.P., G.L., T.R.F.), Neurosurgery (B.A., G.S., M.S.), Neurology, R. Adams Cowley Shock Trauma Center (Y.G.P.), Epidemiology and Public Health (Y.L.), University of Maryland School of Medicine, 22 S Greene St, Baltimore, MD 21201; and University of Maryland School of Medicine, Baltimore, Md (M.R., S.T.)
| | - Solomiya Tsymbalyuk
- From the Departments of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., D.D., T.P., G.L., T.R.F.), Neurosurgery (B.A., G.S., M.S.), Neurology, R. Adams Cowley Shock Trauma Center (Y.G.P.), Epidemiology and Public Health (Y.L.), University of Maryland School of Medicine, 22 S Greene St, Baltimore, MD 21201; and University of Maryland School of Medicine, Baltimore, Md (M.R., S.T.)
| | - Bizhan Aarabi
- From the Departments of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., D.D., T.P., G.L., T.R.F.), Neurosurgery (B.A., G.S., M.S.), Neurology, R. Adams Cowley Shock Trauma Center (Y.G.P.), Epidemiology and Public Health (Y.L.), University of Maryland School of Medicine, 22 S Greene St, Baltimore, MD 21201; and University of Maryland School of Medicine, Baltimore, Md (M.R., S.T.)
| | - Gunjan Y Parikh
- From the Departments of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., D.D., T.P., G.L., T.R.F.), Neurosurgery (B.A., G.S., M.S.), Neurology, R. Adams Cowley Shock Trauma Center (Y.G.P.), Epidemiology and Public Health (Y.L.), University of Maryland School of Medicine, 22 S Greene St, Baltimore, MD 21201; and University of Maryland School of Medicine, Baltimore, Md (M.R., S.T.)
| | - Gary Schwartzbauer
- From the Departments of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., D.D., T.P., G.L., T.R.F.), Neurosurgery (B.A., G.S., M.S.), Neurology, R. Adams Cowley Shock Trauma Center (Y.G.P.), Epidemiology and Public Health (Y.L.), University of Maryland School of Medicine, 22 S Greene St, Baltimore, MD 21201; and University of Maryland School of Medicine, Baltimore, Md (M.R., S.T.)
| | - David Dreizin
- From the Departments of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., D.D., T.P., G.L., T.R.F.), Neurosurgery (B.A., G.S., M.S.), Neurology, R. Adams Cowley Shock Trauma Center (Y.G.P.), Epidemiology and Public Health (Y.L.), University of Maryland School of Medicine, 22 S Greene St, Baltimore, MD 21201; and University of Maryland School of Medicine, Baltimore, Md (M.R., S.T.)
| | - J Marc Simard
- From the Departments of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., D.D., T.P., G.L., T.R.F.), Neurosurgery (B.A., G.S., M.S.), Neurology, R. Adams Cowley Shock Trauma Center (Y.G.P.), Epidemiology and Public Health (Y.L.), University of Maryland School of Medicine, 22 S Greene St, Baltimore, MD 21201; and University of Maryland School of Medicine, Baltimore, Md (M.R., S.T.)
| | - Thomas Ptak
- From the Departments of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., D.D., T.P., G.L., T.R.F.), Neurosurgery (B.A., G.S., M.S.), Neurology, R. Adams Cowley Shock Trauma Center (Y.G.P.), Epidemiology and Public Health (Y.L.), University of Maryland School of Medicine, 22 S Greene St, Baltimore, MD 21201; and University of Maryland School of Medicine, Baltimore, Md (M.R., S.T.)
| | - Guang Li
- From the Departments of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., D.D., T.P., G.L., T.R.F.), Neurosurgery (B.A., G.S., M.S.), Neurology, R. Adams Cowley Shock Trauma Center (Y.G.P.), Epidemiology and Public Health (Y.L.), University of Maryland School of Medicine, 22 S Greene St, Baltimore, MD 21201; and University of Maryland School of Medicine, Baltimore, Md (M.R., S.T.)
| | - Yuanyuan Liang
- From the Departments of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., D.D., T.P., G.L., T.R.F.), Neurosurgery (B.A., G.S., M.S.), Neurology, R. Adams Cowley Shock Trauma Center (Y.G.P.), Epidemiology and Public Health (Y.L.), University of Maryland School of Medicine, 22 S Greene St, Baltimore, MD 21201; and University of Maryland School of Medicine, Baltimore, Md (M.R., S.T.)
| | - Thorsten R Fleiter
- From the Departments of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., D.D., T.P., G.L., T.R.F.), Neurosurgery (B.A., G.S., M.S.), Neurology, R. Adams Cowley Shock Trauma Center (Y.G.P.), Epidemiology and Public Health (Y.L.), University of Maryland School of Medicine, 22 S Greene St, Baltimore, MD 21201; and University of Maryland School of Medicine, Baltimore, Md (M.R., S.T.)
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Dong J, He F, Wang L, Yue Z, Wen T, Wang R, Liu F. Iodine density Changes in Hepatic and Splenic Parenchyma in Liver Cirrhosis with Dual Energy CT (DECT): A Preliminary Study. Acad Radiol 2019; 26:872-877. [PMID: 30262328 DOI: 10.1016/j.acra.2018.08.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Revised: 08/12/2018] [Accepted: 08/14/2018] [Indexed: 12/11/2022]
Abstract
PURPOSE To investigate the hemodynamic changes in liver cirrhosis by comparing iodine density in hepatic and splenic parenchyma with 8 cm detector dual energy CT (DECT). MATERIALS AND METHODS Forty-six consecutive patients with liver cirrhosis and 22 healthy volunteers were recruited in this study, and they were all performed contrast enhanced examination with 8 cm detector DECT. All raw data were reconstructed with 1.25 mm slice thickness, Iodine density (in milligrams per milliliter) were measured on iodine-based material decomposition images. Quantitative indices of iodine density (ID), including normalized ID of liver parenchyma for arterial phase (NIDLAP), ID of liver parenchyma for venous phase (IDLVP), ID of splenic parenchyma for arterial phase (IDSAP), ID of splenic parenchyma for venous phase (IDSVP), ID of portal vein in venous phase (IDPVP) and Liver arterial iodine density fraction (AIF) were measured and compared between two groups. The correlation between Child-Pugh grade and other quantitative indices were calculated, with statistical significance as P<0.05. RESULTS For all 46 liver cirrhosis patients, 10 were classified in grade A, 24 in Grade B and 12 in Grade C. Compared with control group, patients with liver cirrhosis showed (1) no statistical difference in general data (age, gender, height and weight) (all P>0.05), (2) higher iodine density of NIDLAP, IDSVP, IDPVP and AIF, and lower NIDSAP (all P<0.01), (3) NIDLAP, AIF, IDSVP and IDPVP in grade A were all lower than Grade B and C (all P<0.01). (4) AIF and NIDLAP showed positive correlation with Child-Pugh grade, with coefficient of R = 0.71 and R = 0.46, respectively. CONCLUSION Based on iodine density measurement in DECT, it is possible to evaluate the hemodynamic changes in liver and spleen parenchyma in liver cirrhosis. Quantitative indices of AIF and NIDLAP demonstrate positive correlation with Child-Pugh grade, which accommodates potential possibility for DECT as a noninvasive tool in assessing the severity of liver cirrhosis.
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Jain A, Payabvash S. A case of post angiography subdural collection contrast enhancement: Time course of attenuation reduction. Radiol Case Rep 2019; 14:396-399. [PMID: 30627297 PMCID: PMC6321888 DOI: 10.1016/j.radcr.2018.12.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 12/17/2018] [Accepted: 12/21/2018] [Indexed: 12/04/2022] Open
Abstract
The leakage of contrast material into the subdural space following intra-arterial or intravenous administration can present as hyperattenuating subdural collections on noncontrast head computed tomography (CT) scan, mimicking subdural hematomas. Such a finding can potentially initiate erroneous intervention or hinder thromboprophylaxis treatment. We report the time course of attenuation changes in enhancing subdural collections of a patient with suspected stroke following percutaneous coronary intervention. The patient had simple fluid attenuation subdural collections (hygromas) on preprocedure head CT scan, which showed gradually increasing attenuation on 2- and 10-hours post angiography CT scans. On delayed follow-up head CT scan, at 24 and 31 hours after the percutaneous coronary intervention, the subdural collection attenuation returned to preprocedural levels. In this patient, findings on an MRI obtained 9 hours after the procedure, were not in favor of a subdural hematoma. This case highlights the likelihood of contrast leakage into subdural space, mimicking extra-axial hemorrhage on head CT scans, and the time needed for normalization of subdural collection attenuation.
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Affiliation(s)
- Abhi Jain
- Philadelphia College of Osteopathic Medicine, Philadelphia, PA, USA
| | - Seyedmehdi Payabvash
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, CT, USA
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Bodanapally UK, Shanmuganathan K, Issa G, Dreizin D, Li G, Sudini K, Fleiter TR. Dual-Energy CT in Hemorrhagic Progression of Cerebral Contusion: Overestimation of Hematoma Volumes on Standard 120-kV Images and Rectification with Virtual High-Energy Monochromatic Images after Contrast-Enhanced Whole-Body Imaging. AJNR Am J Neuroradiol 2018; 39:658-662. [PMID: 29439124 DOI: 10.3174/ajnr.a5558] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Accepted: 12/11/2017] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE In patients with hemorrhagic contusions, hematoma volumes are overestimated on follow-up standard 120-kV images obtained after contrast-enhanced whole-body CT. We aimed to retrospectively determine hemorrhagic progression of contusion rates on 120-kV and 190-keV images derived from dual-energy CT and the magnitude of hematoma volume overestimation. MATERIALS AND METHODS We retrospectively analyzed admission and follow-up CT studies in 40 patients with hemorrhagic contusions. After annotating the contusions, we measured volumes from admission and follow-up 120-kV and 190-keV images using semiautomated 3D segmentation. Bland-Altman analysis was used for hematoma volume comparison. RESULTS On 120-kV images, hemorrhagic progression of contusions was detected in 24 of the 40 patients, while only 17 patients had hemorrhagic progression of contusions on 190-keV images (P = .008). Hematoma volumes were systematically overestimated on follow-up 120-kV images (9.68 versus 8 mm3; mean difference, 1.68 mm3; standard error, 0.37; P < .001) compared with 190-keV images. There was no significant difference in volumes between admission 120-kV and 190-keV images. Mean and median percentages of overestimation were 29% (95% CI, 18-39) and 22% (quartile 3 - quartile 1 = 36.8), respectively. CONCLUSIONS The 120-kV images, which are comparable with single-energy CT images, significantly overestimated the hematoma volumes, hence the rate of hemorrhagic progression of contusions, after contrast-enhanced whole-body CT. Hence, follow-up of hemorrhagic contusions should be performed on dual-energy CT, and 190-keV images should be used for the assessment of hematoma volumes.
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Affiliation(s)
- U K Bodanapally
- From the Department of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., G.I., D.D., G.L., T.R.F.), R Adams Cowley Shock Trauma Center, University of Maryland Medical Center, Baltimore, Maryland
| | - K Shanmuganathan
- From the Department of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., G.I., D.D., G.L., T.R.F.), R Adams Cowley Shock Trauma Center, University of Maryland Medical Center, Baltimore, Maryland.,Department of Environmental Health Sciences (K.S.), Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland
| | - G Issa
- From the Department of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., G.I., D.D., G.L., T.R.F.), R Adams Cowley Shock Trauma Center, University of Maryland Medical Center, Baltimore, Maryland
| | - D Dreizin
- From the Department of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., G.I., D.D., G.L., T.R.F.), R Adams Cowley Shock Trauma Center, University of Maryland Medical Center, Baltimore, Maryland
| | - G Li
- From the Department of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., G.I., D.D., G.L., T.R.F.), R Adams Cowley Shock Trauma Center, University of Maryland Medical Center, Baltimore, Maryland
| | - K Sudini
- From the Department of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., G.I., D.D., G.L., T.R.F.), R Adams Cowley Shock Trauma Center, University of Maryland Medical Center, Baltimore, Maryland
| | - T R Fleiter
- From the Department of Diagnostic Radiology and Nuclear Medicine (U.K.B., K.S., G.I., D.D., G.L., T.R.F.), R Adams Cowley Shock Trauma Center, University of Maryland Medical Center, Baltimore, Maryland
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