Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: " A case report of pseudoprogression followed by complete remission after proton-beam irradiation for a low-grade glioma in a teenager: the value of dynamic contrast-enhanced MRI...
(BQ) Part 2 book "MRI at a glance" presentation of content: Data acquisition and scan time, signal to noise ratio, spatial resolution, magnetic susceptibility, flow phenomena, phase contrast MR angiography, phase contrast MR angiography, contrast enhanced MR angiography, screening and safety procedures,...
Computed tomography (CT) is the mainstay of
cancer imaging outside of the central nervous
system. Advances in multidetector CT (MDCT)
technology have had a profound impact on its diagnostic
capabilities. Such techniques as multiphase, single breath-hold
imaging, CT angiography (CTA), volume rendering and
virtual colonography owe their success to the development of
multidetector arrays with continuously moving gantries.
Magnetic resonance spectroscopy (MRS), unlike conventional magnetic resonance
imaging (MRI), provides information on the brain’s chemical environment (rather than
neuroanatomical structure) and the data are most commonly presented as line spectra.
This capacity for determining brain metabolite concentrations provides the basis for
clinical investigation of, and differentiation between, neurological and neurosurgical
Although a substantial proportion of individuals over age
50 have reduced ability to absorb naturally occurring
vitamin B12, they are able to absorb the crystalline form.
Thus, all individuals over the age of 50 should be encour
aged to meet their Recommended Dietary Allowance
(RDA) (2.4 µg/day) for vitamin B12 by eating foods fortified
with vitamin B12 such as fortified cereals, or by taking the
crystalline form of vitamin B12 supplements.
The practicing radiologist is continually challenged to update his/her competencies so
as to deliver state-of-the-art radiological care. Nowhere is this truer than in the rapidly
evolving world of magnetic resonance imaging, where innovations in both technology
and diagnostic pharmaceuticals have dramatically altered the landscape of practice.
Combined methods have led to further refinements
with, for example, high visuospatial resolution afforded by MRI combined with
metabolic information from the lesion site (measured with 18F-fluorodeoxyglucose
positron emission tomography; FDG-PET) to indicate location and malignancy of
gliomas, which in turn informs radiosurgical targeting. Kapsalaki et al. (Chapter 7)
consider MRS spectroscopic profiles for differentiation among ring enhancing lesions
including high grade gliomas, abscesses and post-radiation necrosis.
These disorders are caused by maturational white matter abnormalities and therefore
white matter tractography (using DTI) can offer advantages over conventional MRI in
the detectability of clinically relevant microstructural features. High field strength
structural MR scanning (up to 7 tesla for clinical and research use in humans) is now
available in some countries, and this greatly enhances the spatial resolution over that
offered by standard clinical facilities (typically 1.5 or 3 tesla).