Download PDF by Michael C. Johnson, Bruno Policeni, Andrew G. Lee, Wendy: Neuroimaging in Ophthalmology (Opthamology Monograph Series)

By Michael C. Johnson, Bruno Policeni, Andrew G. Lee, Wendy R.K. Smoker

ISBN-10: 0195381610

ISBN-13: 9780195381610

Ophthalmologists are usually the 1st clinicians to guage a sufferer harboring an underlying intraorbital or intracranial structural lesion. This distinct place makes it rather vital for them to appreciate the elemental mechanics, symptoms, and contraindications for the on hand orbital and neuroimaging reports (e.g., CT and MR imaging), in addition to any targeted reports that could be essential to totally evaluation the suspected pathology. it really is both vital for them with the intention to converse their imaging questions and supply proper medical info to the reading radiologist. because the ebook of the unique variation of this American Academy of Ophthalmology Monograph in 1992, new thoughts and distinct sequences have superior our skill to discover pathology within the orbit and mind which are major for the ophthalmologist. during this moment version of Monograph 6, Johnson, Policeni, Lee, and Smoker have up to date the unique content material and summarized the new neuroradiologic literature at the a number of modalities appropriate to CT and MR imaging for ophthalmology. They emphasize vascular imaging advances (e.g., MR angiography (MRA), CT angiography (CTA), MR venography (MRV), and CT venography (CTV) and particular MR sequences (e.g., fats suppression, fluid attenuation inversion restoration (FLAIR), gradient keep in mind echo imaging (GRE), diffusion weighted imaging (DWI), perfusion weighted imaging (PWI), and dynamic perfusion CT (PCT)). they've got additionally incorporated tables that define the indicators, top imaging thoughts for particular ophthalmic entities, and examples of particular radiographic pathology that illustrate the appropriate entities. The target of this Monograph is to augment the severe value of exact, whole, and well timed communication--from the prescribing ophthalmologist to the analyzing radiologist--of the medical findings, differential analysis, and presumed topographical place of the suspected lesion to ensure that the radiologist to accomplish the optimum imaging examine, and finally, to obtain the simplest interpretation.

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Extra info for Neuroimaging in Ophthalmology (Opthamology Monograph Series)

Example text

For example, protons associated with water have a different Larmor frequency than protons associated with lipids because of differences in the electron cloud configuration. H2O Collage in tendon and bone H2O H2O (Fat) H2O H2O Macromolecule Cell membrane Free water H2O Bound water Long Tightly bound water T1 Relaxation time (sec) 1 10–2 MRI signal intensity Hypointense 10–4 T2 Hyperintense Short 1011 107 Larmor frequency of protons Frequency of molecular motion of water (Hz) Figure 1-18. Relaxation time of protons versus frequency (Hz) of molecular motion of water molecules.

Axial T1-weighted (left) and T2-weighted (right) MRI demonstrating normal anatomy. The cistern of velum interpositum (VICi) is an anterosuperior extension of the quadrigeminal plate cistern. F, fornix; FL, frontal lobe; HCN, head of caudate nucleus; LV, lateral ventricle; OL, occipital lobe; Pu, putamen; SF, sylvian fissure; SSS, superior sagittal sinus. 29 Figure 1-29. Axial T1-weighted (left) and T2-weighted (right) MRI demonstrating normal anatomy. Note the dark cerebrospinal fluid signal in the lateral ventricles on T1-weighted image and bright CSF signal on T2-weighted image.

Note that gray matter and white matter have essentially equal proton densities, thus limiting the usefulness of this technique for differentiating normal anatomy. Look at the vitreous cavity and the CSF to make an initial evaluation of the weighting of a scan. If normal vitreous and CSF are hypointense, the scan is T1-weighted. The CSF can also be dark on a T2 FLAIR sequence because fluid signal is suppressed. If the CSF and vitreous are bright, then the scan is likely a T2-weighted study. There is insufficient appreciation of the ability of MRI to adequately image bone and detect fractures.

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Neuroimaging in Ophthalmology (Opthamology Monograph Series) by Michael C. Johnson, Bruno Policeni, Andrew G. Lee, Wendy R.K. Smoker


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