Neuroimaging in Ophthalmology (Opthamology Monograph Series) - download pdf or read online

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

ISBN-10: 0195381610

ISBN-13: 9780195381610

Ophthalmologists are frequently the 1st clinicians to guage a sufferer harboring an underlying intraorbital or intracranial structural lesion. This precise place makes it relatively very important for them to appreciate the fundamental mechanics, symptoms, and contraindications for the to be had orbital and neuroimaging experiences (e.g., CT and MR imaging), in addition to any exact stories that could be essential to totally assessment the suspected pathology. it's both very important for them as a way to speak their imaging questions and supply correct scientific details to the analyzing radiologist. because the booklet of the unique version of this American Academy of Ophthalmology Monograph in 1992, new recommendations and precise sequences have more desirable our skill to observe 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 hot 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 integrated tables that define the symptoms, most sensible imaging thoughts for particular ophthalmic entities, and examples of particular radiographic pathology that illustrate the correct entities. The target of this Monograph is to augment the serious significance of actual, entire, and well timed communication--from the prescribing ophthalmologist to the reading radiologist--of the medical findings, differential analysis, and presumed topographical situation of the suspected lesion to ensure that the radiologist to accomplish the optimum imaging learn, and finally, to obtain the simplest interpretation.

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Because the FID signal will be related to the transverse magnetization, contrast on the printed image will result because the gray matter will produce a greater signal intensity than white matter for tissues of equal proton density. SE (spin-echo) sequences use a similar set of pulses as SR sequences, with the addition of 180° pulses between the 90° pulses. SE techniques include an initial 90° pulse followed by one or more 180° pulses at equal intervals in succession, which generate fi rst and subsequent echoes (or regenerations).

Coronal T1-weighted (left) and T2-weighted (right) MRI of the optic nerve (ON) within the optic canal demonstrating normal anatomy. AC, anterior clinoid process; CC, corpus callosum; FH, frontal horn of lateral ventricle; SP, septum pellucidum; SS, sphenoid sinus. Figure 1-40. Coronal T1-weighted (left) and T2-weighted (right) MRI demonstrating normal intracranial optic nerve (ON) anatomy. Note the flow void (black) of the internal carotid artery (ICA) within the cavernous sinus (CaS). Also note the anterior clinoid process (AC), which is bright on T1-weighted imaging due to bone marrow fat within the process.

Relaxation after the fi nal pulse of such a series occurs from an initial condition of zero net magnetization, rather than from an initial condition of partial magnetization as would occur after a single RF pulse. Saturation-recovery techniques are used in T1-weighted scans of the sella to remove the effects of unsaturated protons in blood moving through the imaging volume. Saturationrecovery techniques also are useful in removing swallowing and respiratory motion artifacts. Table 1-2. 6 Top, Typical imaging parameters used in clinical magnetic resonance images of the orbit.

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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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