Acute intracranial hemorrhage: intensity changes on sequential MR scans at 0.5 T

Zimmerman, Robert D.; Heier, Linda; Snow, Robert B.; Liu, David P. C.; Kelly, Anna B.; Deck, Michael D. F.

doi:10.2214/ajr.150.3.651

Cited by 57 publications

(26 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Intratumoural haemorrhage, reported in approximately 5% of meningiomas, may cause diagnostic problems 5,7,8,13. No case with intratumoural haemorrhage was encountered in this series.…”

Section: Turnour Consistencymentioning

confidence: 63%

Meningiomas: Correlation between MRI characteristics and operative findings including consistency

et al. 1994

View full text Add to dashboard Cite

The findings on magnetic resonance imaging (MRI) in 73 surgically verified intracranial meningiomas were correlated with their histology and consistency during resection. T 1-weighted imaging was least useful since most of the tumours were iso-intense, similar to cortical grey matter regardless of histology or tumour consistency. The signal intensity on T2-weighted images was found to best correlate with both the histology and consistency of the meningioma. Generally, the low intensity portion of the tumour on T2-weighted images indicated a more fibrous and harder character, while the higher intensity portions indicated a more soft character. Most of the fibroblastic meningiomas showed the features of a hard tumour while angioblastic tumours showed the features of soft tumours. Tumours predicted to be harder on MR imaging generally took longer to resect than softer ones, and this relationship was shown best for the larger tumours. Using linear regression analysis, it appears that operative time for soft tumours is more affected by factors other than tumour consistency. Blood loss during surgery was also unrelated to the consistency of the tumour. These results suggest that the histology and consistency of meningiomas may be predictable from findings on T2-weighted imaging, and this may also predict the difficulty and time required for resection.

show abstract

“…Intratumoural haemorrhage, reported in approximately 5% of meningiomas, may cause diagnostic problems 5,7,8,13. No case with intratumoural haemorrhage was encountered in this series.…”

Section: Turnour Consistencymentioning

confidence: 63%

Meningiomas: Correlation between MRI characteristics and operative findings including consistency

et al. 1994

View full text Add to dashboard Cite

show abstract

“…190,191,195,235 Two of these (of 82 patients) demonstrated the superiority of the gradient echo (GRE) technique in the identification of PICH. 190,195 Five (of 47 patients) were descriptive case studies, documenting the clinical characteristics and signs seen on imaging of haemorrhage on MR. 188,193,194,197,201,208 Six studies (427 patients), although including a small number of patients with haemorrhage, were primarily concerned with comparing CT and MRI in ischaemic stroke, and thus little information on accuracy or sensitivity or specificity could be drawn from these. 198,203,204,206,207,267 None of these studies documented the sensitivity of MR for the identification of PICH.…”

Section: Mr and The Identification Of Haemorrhagementioning

confidence: 99%

What is the best imaging strategy for acute stroke?

Wardlaw

Keir

Seymour

et al. 2005

Int J Technol Assess Health Care

View full text Add to dashboard Cite

Non-UK purchasers will have to pay a small fee for post and packing. For European countries the cost is £2 per monograph and for the rest of the world £3 per monograph.You can order HTA monographs from our Despatch Agents:-fax (with credit card or official purchase order) -post (with credit card or official purchase order or cheque) -phone during office hours (credit card only).Additionally the HTA website allows you either to pay securely by credit card or to print out your order and then post or fax it. Contact details are as follows: Payment methods Paying by chequeIf you pay by cheque, the cheque must be in pounds sterling, made payable to Direct Mail Works Ltd and drawn on a bank with a UK address. Paying by credit cardThe following cards are accepted by phone, fax, post or via the website ordering pages: Delta, Eurocard, Mastercard, Solo, Switch and Visa. We advise against sending credit card details in a plain email. Paying by official purchase orderYou can post or fax these, but they must be from public bodies (i.e. NHS or universities) within the UK. We cannot at present accept purchase orders from commercial companies or from outside the UK. How do I get a copy of HTA on CD?Please use the form on the HTA website (www.hta.ac.uk/htacd.htm). Or contact Direct Mail Works (see contact details above) by email, post, fax or phone. HTA on CD is currently free of charge worldwide.The website also provides information about the HTA Programme and lists the membership of the various committees. HTAWhat is the best imaging strategy for acute stroke? NHS R&D HTA ProgrammeT he NHS R&D Health Technology Assessment (HTA) Programme was set up in 1993 to ensure that high-quality research information on the costs, effectiveness and broader impact of health technologies is produced in the most efficient way for those who use, manage and provide care in the NHS.Initially, six HTA panels (pharmaceuticals, acute sector, primary and community care, diagnostics and imaging, population screening, methodology) helped to set the research priorities for the HTA Programme. However, during the past few years there have been a number of changes in and around NHS R&D, such as the establishment of the National Institute for Clinical Excellence (NICE) and the creation of three new research programmes: Service Delivery and Organisation (SDO); New and Emerging Applications of Technology (NEAT); and the Methodology Programme.This has meant that the HTA panels can now focus more explicitly on health technologies ('health technologies' are broadly defined to include all interventions used to promote health, prevent and treat disease, and improve rehabilitation and long-term care) rather than settings of care. Therefore the panel structure was replaced in 2000 by three new panels: Pharmaceuticals; Therapeutic Procedures (including devices and operations); and Diagnostic Technologies and Screening.The HTA Programme will continue to commission both primary and secondary research. The HTA Commissioning Board, supported by the National Coordinat...

show abstract

“…20 - 23 A much simplified schema will be presented here. Acutely, red blood cells (RBC) are hemoconcentrated and form deoxyhemoglobin which results in hypointense regions on T 2 images.…”

Section: Intracerebral Hemorrhagementioning

confidence: 99%

Magnetic resonance and clinical cerebrovascular disease. An update.

Ramadan

Deveshwar

Levine

1989

Stroke

View full text Add to dashboard Cite

-8 of living systems were reported in the literature. Since that time the clinical application of NMR has experienced exponential growth. Because of this rapid pace of development and the concurrent increase in hospitalbased NMR facilities, it is timely to review the application of NMR to the diagnosis and investigation of cerebrovascular disease.Nuclear Magnetic Resonance Detailed physics of the NMR experiment are beyond the scope of this review. However, the parameters used to determine contrast in magnetic resonance imaging and the basics of NMR spectroscopy are briefly described. Magnetic Resonance Imaging (MRI)There are three parameters that determine contrast in NMR imaging: nuclear density, p, and two intrinsic NMR parameters called T, and T 2 . T, and T 2 are relaxation time constants that can have characteristic values for various tissues. By exploiting certain timing aspects of the pulse sequence (a collection of radio frequency [RF] pulses delivered in a specifically timed sequence) used in obtaining an image, one can enhance the relative contribution of p, T l5 and T 2 contrast. The time delays in the RF pulse sequence, which are adjusted to produce variable contrast, are called TR (time-to-repetition) and TE (time-to-echo). TR is related to the speed with which the entire pulse sequence is delivered, usually on the order of seconds, and TE is related to the time between the individual RF pulses within the RF pulse sequence, usually on the order of

show abstract

Acute intracranial hemorrhage: intensity changes on sequential MR scans at 0.5 T

Cited by 57 publications

References 13 publications

Meningiomas: Correlation between MRI characteristics and operative findings including consistency

Meningiomas: Correlation between MRI characteristics and operative findings including consistency

What is the best imaging strategy for acute stroke?

Magnetic resonance and clinical cerebrovascular disease. An update.

Contact Info

Product

Resources

About