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BACKGROUND For a quantitative comparison of images obtained during (99m)Tc-hexamethylpropylene amine oxime (HMPAO) single-photon emission computed tomography (SPECT), brain activity values are usually normalized to a reference region. In studies of Alzheimer-type dementia (ATD), the cerebellum is often used as a reference region, assuming that it is spared(More)
OBJECTIVE To study cerebral abnormalities in myotonic dystrophy (MD) and determine the different patterns of cerebral function in patients with MD with maternal (mMD) vs paternal (pMD) inheritance. DESIGN Patients with MD and normal controls were studied with neuropsychological testing, magnetic resonance imaging, and single photon emission computed(More)
UNLABELLED Transient cognitive and behavioral stabilization of patients with Alzheimer's disease (AD) is the main goal of long-term acetylcholinesterase inhibitor (AChEI) therapy, but response to treatment is variable and, indeed, only some of the patients are stabilized. This is usually assessed by means of clinical and neuropsychologic scales, whereas(More)
Alzheimer's disease (AD) is clinically characterized by cognitive symptoms that, in combination with behavioral disturbances, significantly interfere with activities of daily living. These behavioral disorders contribute to the clinical heterogeneity of the disease and probably express different pathophysiological processes. Apathy is one of the most(More)
Apathy is the most frequent behavioral symptom in Alzheimer's disease and is also frequently reported in other brain organic disorders occurring in the elderly. Based on the literature, we hypothesized that apathy was related to an anterior cingulate hypofunction. Forty-one subjects were studied. According to ICD 10 diagnostic criteria, 28 patients had(More)
This work aims at providing a tool to assist the interpretation of SPECT images for the diagnosis of Alzheimer's Disease (AD). Our approach is to test classifiers, which uses the intensity values of the images, without any prior information. Such a classifier is built upon a training set, containing images with two different labels (AD patients and normal(More)
Brain electrical activity is related to cerebral perfusion. The nature of this relationship is unclear, however, and surface-recorded activity has not been a reliable indicator of brain perfusion. We studied 27 subjects, all of whom were examined with single photon emission tomography (SPECT) and quantitative electroencephalography (QEEG), to assess(More)
UNLABELLED It has been shown in clinical studies that for subjects with a low likelihood of coronary artery disease (CAD), attenuation correction (AC) improves the specificity of defect detection in the inferior wall (right coronary artery [RCA] region). The aim of this study was to investigate the effect of AC on the visual interpretation of the RCA and(More)
Mediastinal irradiation is considered as a long term cardiac risk factor, although no myocardial dysfunction can usually be documented during long term follow-up of the patients having undergone this treatment. We prospectively studied on 124 patients the early effects of irradiation on the myocardium using radionuclide angiography Left ventricular ejection(More)
OBJECTIVES Accurate prediction of outcome in acute stroke would help in identifying subgroups of patients for therapeutic trials and intravenous thrombolysis. The purpose of this study was to prospectively test the hypothesis that brain SPECT, with (99m)Tc-L, L-ethylcysteinate dimer (ECD), a tracer sensitive to cell function, performed in the first hours(More)