A new reference line for coronal head CT to align with MRI: development of a standardised approach

2020 ◽  
pp. 197140092097283
Author(s):  
Kerem Ozturk ◽  
Anthony Spano ◽  
David Nascene
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Intraclass Correlation ◽  
Angular Position ◽  
Magnetic Resonance Images ◽  
Reference Line ◽  
Resonance Imaging ◽  
Brain Computed Tomography ◽  
The Mean

Background and purpose There are great variations in how different technologists create the different imaging planes that can make a precise comparison of computed tomography and magnetic resonance imaging difficult. We aimed to identify a reference line for the coronal images on a computed tomography topography parallel to the posterior borderline of the brainstem (PB), matching standard coronal magnetic resonance imaging planes. Methods We retrospectively reviewed computed tomography topography images of 80 consecutive patients to determine a computed tomography plane to match the PB on magnetic resonance imaging. These included the tuberculum sella (TS)–anterior arch of the C1 vertebra (C1), TS–tip of dens axis (D), dorsum sellae (DS)–C1 and DS–D. We compared these methods of prescribing the coronal computed tomography plane to coronal magnetic resonance imaging planes by measuring the angles between TS–C1 and PB, TS–M and PB, DS–C1 and PB, DS–D and PB on midsagittal brain magnetic resonance images. Bland–Altman plots were created to assess intra-observer reliability. Results The angles between the PB line and each topogram-determined line are as follows: TS–C1, 10.40° ± 4.86°; TS–D, 22.46° ± 5.23°; DS–C1, 3.01° ± 3.16°; and DS–D, 11.53° ± 4.10°. The mean angles between the DS–C1 and the PB lines were significantly smaller than the mean angle between any other line (DS–D, TS–C1, or TS–D, all P < 0.001). Intra-observer agreement regarding the angular position of the reformatted coronal images on the lateral scout image was excellent (intraclass correlation coefficient >0.900, P < 0.05). Conclusions The DS–C1 is almost parallel to the PB and easily identifiable on the lateral scout topography of brain computed tomography. Utilising the DS–C1 line as the baseline for brain computed tomography could allow better corroboration with coronal magnetic resonance imaging angulation.

The Difference between Computed Tomography and Magnetic Resonance Imaging Measurements of Tibial Tubercle–Trochlear Groove Distance for Patients with or without Patellofemoral Instability: A Systematic Review and Meta-analysis

2019 ◽  
Vol 33 (08) ◽  
pp. 768-776 ◽  
Author(s):  
Si Heng Sharon Tan ◽  
Beatrice Ying Lim ◽  
Kiat Soon Jason Chng ◽  
Chintan Doshi ◽  
Francis K.L. Wong ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Patellofemoral Instability ◽  
Tibial Tubercle ◽  
Control Group ◽  
Trochlear Groove ◽  
Resonance Imaging ◽  
The Mean ◽  
Ct And Mri

AbstractThe tibial tubercle–trochlear groove (TT–TG) distance was originally described for computed tomography (CT) but has recently been used on magnetic resonance imaging (MRI) without sufficient evidence demonstrating its validity on MRI. The current review aims to evaluate (1) whether there is a difference in the TT–TG distances measured using CT and MRI, (2) whether both the TT–TG distances measured using CT and MRI could be used to differentiate between patients with or without patellofemoral instability, and (3) whether the same threshold of 15 to 20 mm can be applied for both TT–TG distances measured using CT and MRI. The review was conducted using the preferred reporting items for systematic reviews and meta-analyses (PRSIMA) guidelines. All studies that compared TT–TG distances either (1) between CT and MRI or (2) between patients with and without patellofemoral instability were included. A total of 23 publications were included in the review. These included a total of 3,040 patients. All publications reported the TT–TG distance to be greater in patients with patellofemoral instability as compared to those without patellofemoral instability. This difference was noted for both TT–TG distances measured on CT and on MRI. All publications also reported the TT–TG distance measured on CT to be greater than that measured on MRI (mean difference [MD] = 1.79 mm; 95% confidence interval [CI]: 0.91–2.68). Pooling of the studies revealed that the mean TT–TG distance for the control group was 12.85 mm (95% CI: 11.71–14.01) while the mean TT–TG distance for patients with patellofemoral instability was 18.33 mm (95% CI: 17.04–19.62) when measured on CT. When measured on MRI, the mean TT–TG distance for the control group was 9.83 mm (95% CI: 9.11–10.54), while the mean TT–TG distance for patients with patellofemoral instability was 15.33 mm (95% CI: 14.24–16.42). Both the TTTG distances measured on CT and MRI could be used to differentiate between patients with and without patellofemoral instability. Patients with patellofemoral instability had significantly greater TT–TG distances than those without. However, the TT–TG distances measured on CT were significantly greater than that measured on MRI. Different cut-off values should, therefore, be used for TT–TG distances measured on CT and on MRI in the determination of normal versus abnormal values. Pooling of all the patients included in the review then suggest for 15.5 ± 1.5 mm to be used as the cut off for TT–TG distance measured on CT, and for 12.5 ± 2 mm to be used as the cut-off for TT–TG distance measured on MRI. The Level of evidence for this study is IV.

Volumetric Analysis of Intracranial Arteriovenous Malformations Contoured for CyberKnife Radiosurgery With 3-Dimensional Rotational Angiography vs Computed Tomography/Magnetic Resonance Imaging

Neurosurgery ◽  
2013 ◽  
Vol 73 (2) ◽  
pp. 262-270 ◽  
Author(s):  
Anand Veeravagu ◽  
Ake Hansasuta ◽  
Bowen Jiang ◽  
Aftab S. Karim ◽  
Iris C. Gibbs ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Confidence Interval ◽  
Cerebral Angiography ◽  
Resonance Imaging ◽  
3 Dimensional ◽  
Cyberknife Radiosurgery ◽  
The Mean ◽  
Volume Difference

Abstract BACKGROUND: Accurate target delineation has significant impact on brain arteriovenous malformation (AVM) obliteration, treatment success, and potential complications of stereotactic radiosurgery. OBJECTIVE: We compare the nidal contouring of AVMs using fused images of contrasted computed tomography (CT) and magnetic resonance imaging (MRI) with matched images of 3-dimensional (3-D) cerebral angiography for CyberKnife radiosurgery (CKRS) treatment planning. METHODS: Between May 2009 and April 2012, 3-D cerebral angiography was integrated into CKRS target planning for 30 consecutive patients. The AVM nidal target volumes were delineated using fused CT and MRI scans vs fused CT, MRI, and 3-D cerebral angiography for each patient. RESULTS: The mean volume of the AVM nidus contoured with the addition of 3-D cerebral angiography to the CT/MRI fusion (9.09 cm3, 95% confidence interval: 5.39 cm3-12.8 cm3) was statistically smaller than the mean volume contoured with CT/MRI fused scans alone (14.1 cm3, 95% confidence interval: 9.16 cm3-19.1 cm3), with a mean volume difference of δ = 5.01 cm3 (P = .001). Diffuse AVM nidus was associated with larger mean volume differences compared with a compact nidus (δ = 6.51 vs 2.11 cm3, P = .02). The mean volume difference was not statistically associated with the patient's sex (male δ = 5.61, female δ = 5.06, P = .84), previous hemorrhage status (yes δ = 5.69, no δ = 5.23, P = .86), or previous embolization status (yes δ = 6.80, no δ = 5.95, P = .11). CONCLUSION: For brain AVMs treated with CKRS, the addition of 3-D cerebral angiography to CT/MRI fusions for diagnostic accuracy results in a statistically significant reduction in contoured nidal volume compared with standard CT/MRI fusion-based contouring.

Xác định thể tích chiếu xạ các khối u não dựa vào hình ảnh cắt lớp vi tính và cộng hưởng từ

2020 ◽  
Author(s):  
Tuong Pham Nguyen
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Brain Tumors ◽  
Cerebral Edema ◽  
Magnetic Resonance Images ◽  
Resonance Imaging ◽  
Cross Sectional ◽  
Computed Tomography Images ◽  
Bone Changes

Purpose: Compare Computed Tomography and Magnetic Resonance Imaging to accurately determine the volume of brain tumors for radiotherapy. Methods and Materials: Cross-sectional descriptive study on 38 patients with brain tumors indicated for radiation therapy, underwent Magnetic Resonance Imaging and CT scans at Hue Central Hospital from January 2018 to July 2019. Data processed with MS Excel 2013, SPSS 20.0 and statistical algorithms. Results: The Magnetic Resonance Imaging has a rate of brain tumor detection of 100% while that of computed tomography only reached 60.5%. The average difference in tumor size is 0.66 cm, the size of the tumor is larger on the magnetic resonance images. There is a close agreement on Magnetic Resonance Imaging and computer tomography on the level of cerebral edema (kappa = 0.735, p <0.001), on the amount of mid line shift of the tumor (kappa = 0.775, p <0.001); and detected cocoons in tumor (kappa = 1.000, p <0.001). Conclusions: Magnetic Resonance has advantages over computed tomography in the ability to detect brain tumors, tumor margin, the ability to detect the level of cerebral edema, invasive properties and identify cocoons in tumors. Computed Tomography is more advantageous than Magnetic Resonance in cases with calcification in the tumors or bone changes. Fusing computed tomography images and Magnetic Resonance Imaging together is a more effective method of determining the volume of brain tumors for radiotherapy.

scholarly journals Traditional and Advanced Neuroimaging Contributions to the Diagnosis and Differential Diagnosis of Central Nervous System Lymphoma Patients Visiting a Comprehensive Medical Center

2020 ◽  
Vol 13 (1) ◽  
pp. 6-15
Author(s):  
Ali El Dirani ◽  
Zahraa Hachem ◽  
Assaad Mohanna ◽  
Amira J. Zaylaa
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Central Nervous System ◽  
Nervous System ◽  
Magnetic Resonance ◽  
Imaging Techniques ◽  
Central Nervous System Lymphoma ◽  
Magnetic Resonance Images ◽  
Imaging Features ◽  
Resonance Imaging

Introduction: The diagnosis of Central Nervous System Lymphoma, especially the Primary Central Nervous System Lymphoma is carried out based on brain imaging, thus avoiding an unnecessary extend of surgery. But the traditional imaging techniques, such as Computed Tomography and Magnetic Resonance Imaging, were not satisfactory. Aims: This study was conducted to characterize the spectrum of advanced Neuroimaging, such as the advanced Magnetic Resonance Imaging features in the Central Nervous System Lymphoma patients in a comprehensive medical center in Lebanon, and compare them to what has been described in the literature review. Methods: It is a retrospective exploratory study of the clinical data and imaging features for patients admitted to the emergency and radiology departments with ages above 10 years, and who were diagnosed histopathologically with intracranial lymphoma. This study may be the first to make a Radiological evaluation of Central Nervous System Lymphoma on the local population of patients over 9 years . Results: Results showed that the study of the Computed Tomography and Magnetic Resonance Imaging data of 10 immunocompetent patients with Central Nervous System Lymphoma concurs with the previously described patient populations, except for the gender parameter. Tumors were mostly presented in the fifth or Sixth decade and they could be solitary or multi-focal. Lesions were typically located Preprint submitted to The Open Neuroimaging Journal May 14, 2020 in the supratentorial compartment. On the brain Computed Tomography, the lesions were hyperdense, and in pre-contrast Magnetic Resonance images, the lesions appeared hypointense on T1 and hyperintense on T2-Weighted images, but hypointense with respect to the grey matter. The lesions were also surrounded with a mild to moderate edema as compared to other intracranial neoplasms, such as glioblastomas. Evaluation results showed that on post-contrast Magnetic Resonance images, the majority of lesions exhibited a homogeneous enhancement of 50%. Majority of the lesions also showed a less common heterogeneous ring-like enhancement of 40%, and revealed the uncommon absence of enhancement of 10%. Calcifications, hemorrhage, and necrosis were rare findings and were present in only one patient. Conclusion: As a future prospect, studying whether the advanced imaging techniques may provide not only non-invasive and morphological characteristics but also non-invasive biological characteristics and thus accurate diagnosis could be considered.

The OMERACT-RAMRIS Rheumatoid Arthritis Magnetic Resonance Imaging Joint Space Narrowing Score: Intrareader and Interreader Reliability and Agreement with Computed Tomography and Conventional Radiography

2013 ◽  
Vol 41 (2) ◽  
pp. 392-397 ◽  
Author(s):  
Uffe Møller Døhn ◽  
Philip G. Conaghan ◽  
Iris Eshed ◽  
Annelies Boonen ◽  
Pernille Boyesen ◽  
...  
Keyword(s):  
Rheumatoid Arthritis ◽  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Joint Space Narrowing ◽  
Intraclass Correlation ◽  
Joint Space ◽  
Imaging Data ◽  
Resonance Imaging ◽  
Scoring Method

Objective.To test the intrareader and interreader reliability of assessment of joint space narrowing (JSN) in rheumatoid arthritis (RA) wrist and metacarpophalangeal (MCP) joints on magnetic resonance imaging (MRI) and computed tomography (CT) using the newly proposed OMERACT-RAMRIS JSN scoring method, and to compare JSN assessment on MRI, CT, and radiography.Methods.After calibration of readers, MRI and CT images of the wrist and second to fifth MCP joints from 14 patients with RA and 1 healthy control were assessed twice for JSN by 3 readers, blinded to clinical and imaging data. Radiographs were scored by the Sharp/van der Heijde method. Intraclass correlation coefficients (ICC) and smallest detectable differences (SDD) were calculated, and the performance of various simplified scores was investigated.Results.Both MRI and CT showed high intrareader (ICC ≥ 0.95) and interreader (ICC ≥ 0.94) reliability for total (wrist + MCP) assessment of JSN. Agreement was generally lower for MCP joints than for wrist joints, particularly for CT. Intrareader SDD for MCP/wrist/MCP + wrist were 1.2/6.1/6.4 JSN units for MRI, while 2.7/8.3/9.9 JSN units for CT. JSN on MRI and CT correlated moderately well with corresponding radiographic JSN scores (MCP 2–5: 0.49 and 0.56; wrist areas assessed by Sharp/van der Heijde: 0.80 and 0.95), and high ICC between scores on MRI and CT were demonstrated (MCP: 0.94; wrist: 0.92; MCP + wrist: 0.92).Conclusion.The OMERACT-RAMRIS MRI JSN scoring system showed high intrareader and interreader reliability, and high correlation with CT scores of JSN. The suggested JSN score may, after further validation in longitudinal studies, become a useful tool in RA clinical trials.

scholarly journals The Diagnostic Value of Cervical Lymph Node Metastasis in Head and Neck Squamous Carcinoma by Using Diffusion-Weighted Magnetic Resonance Imaging and Computed Tomography Perfusion

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Jin Zhong ◽  
Zonghong Lu ◽  
Liang Xu ◽  
Longchun Dong ◽  
Hui Qiao ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Head And Neck ◽  
Resonance Imaging ◽  
Adc Value ◽  
Computed Tomography Perfusion ◽  
Diffusion Weighted ◽  
Weighted Magnetic Resonance Imaging ◽  
The Mean

Purpose.The aim of this study was to compare diffusion-weighted magnetic resonance imaging (DWI) with computed tomography perfusion (CTP) for preoperative detection of metastases to lymph nodes (LNs) in head and neck squamous cell carcinoma (SCC).Methods.Between May 2010 and April 2012, 30 patients with head and neck SCC underwent preoperative DWI and CTP. Two radiologists measured apparent diffusion coefficient (ADC) values and CTP parameters independently. Surgery and histopathologic examinations were performed on all patients.Results.On DWI, 65 LNs were detected in 30 patients. The mean ADC value of metastatic nodes was lower than benign nodes and the difference was statistically significant (P<0.05). On CTP images, the mean value in metastatic nodes of blood flow (BF) and blood volume (BV) was higher than that in benign nodes, and mean transit time (MTT) in metastatic nodes was lower than that in benign nodes. There were significant differences in BF and MTT values between metastatic and benign LNs (P<0.05). There were significant differences between the AUCs of DWI and CTP (Z=4.612,P<0.001).Conclusion.DWI with ADC value measurements may be more accurate than CTP for the preoperative diagnosis of cervical LN metastases.

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