1,721,026 research outputs found
In vivo Hematoporphyrin mediated Fluorescence Reflectance Imaging: early tumor detection on small animals
No full textEsercizi di Fisica Biomedica
No full textTesto universitario per studenti di biologia e medicina, contenente eserzizi a quiz interamente svolt
Estimation of the power spectrum of bio-medical signals
No full textDesciption of the use of spectral analysis methods in the analysis of electrooculographic signals in patients with oculomotor disorders
Spectral analysis of EOG signals in the study of ocular motility disorders
No full textIllustration of the methods of spectral analysis applied to EOG signals in the study of ocular motility disorders
Spectral analysis of electro-oculograms in the quantitative evaluation of nystagmus surgery
No full textDescription of the method of spectral analysis of EOG and ENG signals in the quantitative estimation of the effects of congenital nystagmus surgery
Spectral Analysis of Pendular Waveforms in Congenital Nystagmus
No full textWe analyzed quantitatively electronystagmographic recordings of pendular waveforms via spectral analysis methods. We found (1) symmetrical pendular oscillations in orbital positions spanning a range as wide as 40°, with frequencies between 2 and 8 Hz; (2) stable and small pendular oscillations in patients without a null zone and unstable and large pendular oscillations in patients with a neutral zone; (3) a non-decreasing relationship between the amplitude and the frequency of the eye oscillations, and (4) pendular components in orbital positions at the two sides of a neutral zone. It is argued that pendular nystagmus can be generated independently of normal (jerk) nystagmus in the same orbital position
Computer-analysis of Eng Spectral Features From Patients With Congenital Nystagmus
No full textPower spectral estimation,from electronystagmographic recording of eye position is proposed as a simple digital processing method to quantify both the amplitude and the frequency features of eye motion in patients affected by the oculomotor disorder of congenital nystagmus (CN). Di$erent basic wave shapes clinically identified and studied in the literature are shown to have slightly different power .spectra, which ran be used to characterize the CN disorder from nystagmus waveforms. This
treatment, statistical in nature, does not depend strongly on the detailed structure of each recorded wave shape, thus emphasizing that accurate descriptive analysis of all patient’s waveforms characteristics adds little to the comprehension of CN. We show that the power spectral estimation also represents a useful tool in modelling both the CN defect and the non-defective oculomotor
Jystem, and in assessing the effect of the surgical treatment of CN through the differences in the power spectra before and after surgery
The Backus-Gilbert Inversion Method and the Processing of Sampled Data
No full textThe Backus-Gilbert (BG) method is an inversion method for solving integral equations. We show that, given a set of idealized delta-function kernels in the BG formalism, it is possible to derive an interpolation formula for a band-limited function very closely comparable with the perfect interpolation formula given by the Shannon theorem
Application of Monte Carlo technique to time-resolved transillumination: a comparison with experimental data
No full textAmount of Surgery in Congenital Nystagmus
No full textBy analyzing the clinical data on the amount of surgery on the extraocular muscles and resulting angular shift of the null zone in 24 patients with congenital nystagmus, a linear dependence was found to exist between these two variables. Hence, the amount of surgery can be confidently established in advance of treatment in order to obtain the shift of the null zone. Many cases of partial surgical successes are discussed and explained a posteriori by a lack of a proper amount of surgical rotation
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