1,721,048 research outputs found
Large-scale structural pattern as the result of the interplay between compression and extension during chain building: the case of the Sicily belt (central Mediterranean)
No full textUltrasonic evaluation with second harmonic imaging and SonoVue in the assessment of cerebral perfusion in diabetic patients: a case-control study
No full textThe purpose was to compare
human brain tissue perfusion
in diabetic patients and healthy subjects
with second harmonic imaging
ultrasound and SonoVue to test the
hypothesis that brain tissue perfusion
differences are present in these two
groups of patients. In a prospective
case-control study, second harmonic
examinations performed in 20 patients
with type II diabetes mellitus
and in 20 matched control patients
were compared. After administration
of 2.5 ml of SonoVue, 60 time-triggered
images were recorded. Timeintensity
curves, including peak intensity
and positive gradient normalized
to the middle cerebral artery,
were calculated to quantify ultrasound
intensity in a region of interest.
The Mann-Whitney U-test was
used to reveal any differences between
healthy and diabetic subjects.
Mean peak intensity was 0.64±0.1 Au
in healthy subjects and 0.53±0.09 Au
in diabetic patients. Mean positive
gradient was 0.04±0.007 Au/s in
healthy subjects and 0.04±0.008 Au/s
in diabetic patients. Peak intensity
and positive gradient were significantly
lower in diabetic patients than
in healthy subjects (P<0.05). Ultrasound
examination with second harmonic
imaging and SonoVue administration
is able to detect clinically
silent, reduced cerebral perfusion in
type II diabetic patients. Diabetic patients
have reduced cerebral perfusion
in comparison to healthy subjects
IMAGING OF VESTIBULAR SCHWANNOMA
No full textLesions of the cerebellopontine angle and internal auditory canal are a frequent finding in neuroradiological examinations and their detection may represent a diagnostic challenge. Among these lesions, vestibular
schwannomas and meningiomas are certainly the most frequent and account for up to 90% of all cerebellopontine angle tumours. The remaining ones are a group of lesions arising from the different structures found in these anatomical regions such as haemangiomas, lipomas, lymphomas, facial nerve tumours, and aneurysms. This chapter will introduce this topic focusing on a practical coverage of the typical and atypical neuroradiological signs that will drive towards the most correct differential diagnosis checklist. High-quality neuroradiological images will support the reader for an optimal learning experience
CT imaging of acute and chronic pyelonephritis: a practical guide for emergency radiologists
No full textContrast-enhanced CT is not routinely indicated in uncomplicated urinary infections, but it may be necessary in patients with specific risk factors (i.e., diabetes, immunocompromised patients, history of stones, or prior renal surgery) or in patients not responding to antibiotics and in detecting complications of pyelonephritis. CT is the gold standard for imaging assessment of pyelonephritis severity. Imaging appearance of acute pyelonephritis, including focal (i.e., wedge-shaped zones of decreased attenuation or hypodense mass) and diffuse (i.e., global enlargement, poor parenchymal enhancement, lack of excretion of contrast, fat stranding) forms, needs to be differentiated from renal infarction, renal lymphoma, and interstitial nephritis. Chronic pyelonephritis—which appears as focal polar scars with underlying calyceal distortion, global atrophy, and hypertrophy of residual tissue—may mimic at imaging lobar infarcts. This pictorial essay reviews the CT imaging appearance of acute and chronic pyelonephritis, their uncommon subtypes, and their complications, with key features for early diagnosis. Their knowledge is crucial for emergency and abdominal radiologists to avoid misdiagnosis with malignancy and to guide the clinician towards the appropriate medical or surgical treatment
large scale structural patterne as the result of the interplay between compression and extension during chain building: the case of the Sicily belt (central Mediterranean)
No full textImages - Computed tomography urographic appearance of traumatic rupture of renal cyst into the pyelocaliceal system
No full textSpontaneous or traumatic rupture of renal cysts, documented by radiological imaging, occurs infrequently. The pathogenesis of a cyst rupture is still unclear, except when it has
occurred following trauma or when the cyst has become infected. Imaging plays a crucial role in the diagnosis, management, surveillance, and choice of lesions that need
treatment
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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