Aharon Peretz

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BACKGROUND Nonuniform attenuation artifacts cause suboptimal specificity of stress single photon emission computed tomography (SPECT) myocardial perfusion images. In phantoms, normal subjects, and patients suspected of having coronary artery disease (CAD), we evaluated a new hybrid attenuation correction (AC) system that combines x-ray computed tomography(More)
Giant cell arteritis (GCA) is the most common vasculitis in Western countries in individuals over the age of 50. The diagnosis is relatively straightforward when typical features, such as headache, jaw claudication or other ischemic complications are present. Although atypical presentations of GCA have been described, herein we report for first time low(More)
Low back pain is a frequent symptom to consult the general practioner or the osteo-articular specialist. It is important to identify patients with inflammatory back pain (5 to 10 %) because the management and the treatment are different. Spondylarthropathies, especially ankylosing spondylitis (AS) are the most frequently encountered. The inflammatory(More)
Glucocorticoids are useful as therapeutic agents in a wide variety of clinical disorders for their antiinflammatory, immunosuppressive and cytolytic properties. When administered in supraphysiological doses they cause an array of undesired side-effects that greatly limit their clinical utility. Among them, the development of osteoporosis is critical. It is(More)
The discovery of two isoforms of cyclooxygenase, Cox-1 constitutive and Cox-2 inducible, has prompted the development of new molecules with high Cox-2 selectivity. These new NSAIDs belong to the coxib class and have theoretically a better digestive tolerability than classical NSAID have. In Belgium, rofecoxib ((Vioxx) and celecoxib (Celebrex) are(More)
Osteoporosis is a disease affecting a large population of postmenopausal women. The treatment is given for a period of 5, 10, 20 years.... The cost of the treatment plays an important role in the field of health economy. A commercial form of calcium and vitamin D for 10 years represent for the patient a cost of 50,000 BF. The other treatments, alternative(More)
Bone is a tissue undergoing permanent remodeling, submitted to the influence of endocrine and local (or paracrine) factors. After reaching a peak, bone mass decline physiologically with age, showing a more important decrease during early postmenopausal years. Bone remodeling tightly couples bone resorption due to osteoclasts to bone formation due to(More)
  • Aharon Peretz
  • Bulletin et mémoires de l'Académie royale de me…
  • 1993
The recent development of biochemical markers gives the opportunity to assess bone metabolism. Osteocalcin is a non collagenous protein of the bone matrix specifically synthesized by osteoblasts. The concentration of osteocalcin in serum reflects osteoblastic function and bone turnover. It has emerged as a more specific index of bone metabolism than serum(More)
OBJECTIVES SPECT/slow-rotation low-output CT systems can produce streak artifacts in filtered backprojection (FBP) attenuation maps, impacting attenuation correction (AC) in myocardial perfusion imaging. This paper presents an adaptive Bayesian iterative transmission reconstruction (ABITR) algorithm for more accurate AC. METHODS In each iteration, ABITR(More)
Muskuloskeletal ultrasound has been incorporated by rheumatologist to the clinical practice over the past decade. The technical improvements of the devices allowed the production of high quality images contributing to better identification of joint inflammation and structural damage. In this review, we highlight the applications of ultrasound in the study(More)