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1.
Neuroradiol J ; 36(6): 638-650, 2023 Dec.
Article in English | MEDLINE | ID: mdl-36172883

ABSTRACT

Arterial spin labeling (ASL) is a magnetic resonance perfusion technique that allows for quantification of cerebral blood flow (CBF) without the use of contrast or radiation. Several applications of ASL have been described in diagnosis of strokes and stroke mimics, intracranial tumors, and other conditions. Various vascular anomalies exhibit specific CBF patterns that correlate with different signal intensities on ASL. In this case-based review, we demonstrate the utility of ASL in diagnosis and surveillance of vascular anomalies in the intracranial compartment.


Subject(s)
Brain Neoplasms , Cardiovascular Abnormalities , Stroke , Vascular Malformations , Humans , Magnetic Resonance Angiography/methods , Spin Labels , Magnetic Resonance Imaging/methods , Brain Neoplasms/diagnostic imaging , Stroke/diagnostic imaging , Cerebrovascular Circulation
2.
AJR Am J Roentgenol ; 202(4): W314-24, 2014 Apr.
Article in English | MEDLINE | ID: mdl-24660729

ABSTRACT

OBJECTIVE: Recent technologic advances in MDCT have led to the introduction of dual-energy CT (DECT). The basic principle of DECT is to acquire images at two different energy levels simultaneously and to use the attenuation differences at these different energy levels for deriving additional information, such as virtual monochromatic images, artifact suppression, and material composition of various tissues. CONCLUSION: A variety of image reconstruction and postprocessing techniques are available for better demonstration and characterization of pathologic abnormalities. DECT can provide both anatomic and functional information of different organ systems. This article focuses on the main applications of DECT in emergency radiology.


Subject(s)
Emergency Medicine/methods , Radiographic Image Interpretation, Computer-Assisted/methods , Radiography, Dual-Energy Scanned Projection/methods , Tomography, X-Ray Computed/methods , Contrast Media , Humans , Prognosis , Risk Assessment
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