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502 results on '"Ophir J"'

9. The combined effect of signal decorrelation and random noise on the variance of time delay estimation

Author

Cespedes, I., Ophir, J., and Alam, S. Kaisar

Subjects
Signal detection (Electronics) -- Research, Random noise theory -- Usage, Signal to noise ratio -- Observations, Correlation (Statistics) -- Usage, Business, Electronics, Electronics and electrical industries
Abstract

The combined effect of signal decorrelation and random noise on the variance of time delay estimation is assessed. An expression which converts the peak of the correlation coefficient function into a signal-to-noise (SNR) ratio has been obtained for two jointly stationary signals separated by a delay. However, this expression is valid only when the noise is stationary and uncorrelated with the signal. The equivalence of the SNR to the peak of the correlation coefficient function has been exploited to derive an expression for Cramer-Rao lower bound by using an SNR-rho relationship.

Published
1997

13. Theoretical bounds of strain estimation in elastography

Author

Cespedes, I., Insana, M., and Ophir, J.

Subjects
Strains and stresses -- Analysis, Compressibility -- Analysis, Echo -- Analysis, Elastic waves -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

An expression for the lower bound of the strain estimation error (LBSE) was achieved based on the Cramer-Rao Lower Bound (CRLB). For deriving the LBSE equation, it was assumed that post-compression echo signal could be retained to the pre-compression shape of the echo signal. Potential of the LBSE equation for considerably reducing the level of noise in elastograms is discussed.

Published
1995

26. Treatment of male genital condylomatous lesions by carbon dioxide laser after failure of previous nonlaser methods

Author

Bar-Am, A., Shilon, M., Peyser, M.R., Ophir, J., and Brenner, S.

Subjects
Papillomaviruses, Carbon dioxide lasers -- Health aspects, Condyloma acuminatum -- Care and treatment, Health
Abstract

Condylomatous lesions are warts that appear on the genital organs. The lesions have been associated with human papilloma virus (a virus that causes warts). In men, genital warts are treated with drugs such as podophyllin or 5-fluorouracil, applied directly to the warts or given systemically with interferon, or the warts are surgically removed. The lack of success using these methods of treatment has prompted the use of carbon dioxide laser therapy. The effectiveness of carbon dioxide laser therapy in treating genital warts was evaluated in 119 men with recurrent genital warts. These patients had been treated with podophyllin, 5-fluorouracil, interferon or liquid nitrogen for an average of 11 months, and their warts did not disappear. A Sharplan carbon dioxide laser beam was used to treat the warts; typical treatment time was 11 to 15 minutes. In 98 patients (82 percent), the warts disappeared after one treatment. Ten percent of the patients required two treatments, and 7.5 percent required three treatments. Thirteen percent of the patients developed infections, and in 9 percent of the patients the warts reappeared within 8 to 11 weeks of treatment. The advantages of carbon dioxide laser therapy include accuracy, minimal damage to surrounding tissue, ability to alter the power of the laser beam, ability to treat small and large warts, and the ability to reach warts that may not be reached by other methods of treatment. (Consumer Summary produced by Reliance Medical Information, Inc.)

Published
1991

27. Immediate and delayed effects of treatment at the Dead Sea in patients with psoriatic arthritis

Author

Efron D, Ori Elkayam, Brener S, Ophir J, Politi Y, Even-Paz Z, Daphna Paran, Irena Wigler, and Michael Yaron

Subjects
Male, Balneotherapy, medicine.medical_specialty, Time Factors, Bathing, Ultraviolet Rays, medicine.medical_treatment, Immunology, Arthritis, Psoriatic arthritis, Rheumatology, Psoriasis Area and Severity Index, Psoriasis, Hand strength, medicine, Back pain, Humans, Immunology and Allergy, Israel, Skin, Neck Pain, Hand Strength, Balneology, business.industry, Mud Therapy, Arthritis, Psoriatic, Middle Aged, medicine.disease, Combined Modality Therapy, Surgery, Back Pain, Female, Joints, medicine.symptom, business
Abstract

The purpose of this study was to evaluate the immediate and delayed effects of balneotherapy at the Dead Sea on patients with psoriatic arthritis (PsA). A total of 42 patients with PsA were treated at the Dead Sea for 4 weeks. Patients were randomly allocated into two groups: group 1 (23 patients) and group 2 (19 patients). Both groups received daily exposure to sun ultraviolet rays and regular bathing at the Dead Sea. Group 1 was also treated with mud packs and sulfur baths. Patients were assessed by a dermatologist and a rheumatologist 3 days before arrival, at the end of treatment, and at weeks 8, 16, and 28 from the start of treatment. The clinical indices assessed were morning stiffness, right and left hand grip, number of tender joints, number of swollen joints, Schober test, distance from finger to floor when bending forward, patient's self-assessment of disease severity, inflammatory neck and back pain and psoriasis area and severity index (PASI) score. Comparison between groups disclosed a similar statistically significant improvement for variables such as PASI, morning stiffness, patient self-assessment, right and left grip, Schober test and distance from finger to floor when bending forward. For variables such as tender and swollen joints, and inflammatory neck and back pain, improvement over time was statistically significant in group 1. Addition of mud packs and sulfur baths to sun ultraviolet exposure and Dead Sea baths seems to prolong beneficial effects and improves inflammatory back pain.

Published
2000

29. The anti-inflammatory target A3 adenosine receptor is over-expressed in rheumatoid arthritis, psoriasis and Crohn’s disease

Author

Ochaion, A., primary, Bar-Yehuda, S., additional, Cohen, S., additional, Barer, F., additional, Patoka, R., additional, Amital, H., additional, Reitblat, T., additional, Reitblat, A., additional, Ophir, J., additional, Konfino, I., additional, Chowers, Y., additional, Ben-Horin, S., additional, and Fishman, P., additional

Published
2009
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42. EUTHYROID PRETIBIAL MYXEDEMA

Author

Sarah Brenner, Srebrnik A, and Ophir J

Subjects
Adult, Male, medicine.medical_specialty, business.industry, Pretibial myxedema, Dermatology, Leg Dermatoses, Thyroid Function Tests, medicine.disease, Surgery, Myxedema, medicine, Humans, Euthyroid, business
Published
1992

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