W. A. Kaiser

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OBJECTIVE The aim of our study was to evaluate contrast-enhanced sonography as an alternative to radiographic voiding cystourethrography in the detection of vesicoureteral reflux. SUBJECTS AND METHODS A total of 46 children, ranging in age from 3 weeks to 14 years (median: 4 years, 6 months) with 92 ureterorenal units were investigated for reflux using(More)
OBJECTIVE To evaluate digital x-ray radiogrammetry (DXR) and the Radiogrammetry Kit program as new diagnostic tools for quantifying disease-related periarticular osteoporosis and for measuring joint space narrowing according to the severity and duration of rheumatoid arthritis (RA). METHODS Using DXR, we performed computerized calculations of bone mineral(More)
It has been demonstrated by single photon emission computed tomography (SPECT) and positron emission tomography (PET) that frontal brain regions are stimulated during performance of the Wisconsin Card Sorting Test (WCST). The WCST is also regarded as one of the standard tests for the assessment of frontal activity in brain imaging studies of schizophrenia.(More)
Of a total of 191 magnetic resonance breast studies performed since March 1984, 82 were performed with gradient-echo fast low-angle shot (FLASH) sequences and fast imaging with steady precession (FISP). These techniques permit imaging of thin and contiguous sections, resulting in high resolution of the parenchymal structure. Intravenous injection of 0.1(More)
The present study addresses phonological processing in children with developmental dyslexia. Following the hypothesis of a core deficit of assembled phonology in dyslexia a set of hierarchically structured tasks was applied that specifically control for different kinds of phonological coding (assembled versus addressed phonological strategies). Seventeen(More)
The objective of this review is to describe characteristic MR mammographic findings for signal increase and morphological patterns of enhancement in pure ductal carcinoma in situ (DCIS) and to differentiate between high grade and non-high grade lesions. The dynamic MR examination (1.5 T unit, contrast enhanced T(1) weighted two dimensional fast field echo,(More)
PURPOSE To employ a high resolution blood oxygenation level dependent (BOLD) method called susceptibility weighted imaging (SWI) together with the breathing of carbogen to investigate the response of cerebral tumors to this breathing gas and to assess tumor anatomy at high resolution. METHODS Five patients with cerebral tumors (four glioblastoma(More)
Magnetic nanoparticles are promising tools for the minimal invasive elimination of small tumours in the breast using magnetically-induced heating. The approach complies with the increasing demand for breast conserving therapies and has the advantage of offering a selective and refined tuning of the degree of energy deposition allowing an adequate(More)
The Continuous Performance Test (CPT) has become an essential constituent of the neuropsychological investigation of schizophrenia. Also, a vast number of brain imaging studies, mostly PET investigations, have employed the CPT as a cognitive challenge and established a relative hypofrontality in schizophrenics compared to controls. The aim of the present(More)
Sonography and color-coded Doppler sonography are the methods of first choice in diagnosing pathological changes of the testes. The MRI technique was tested using a dynamic technique to evaluate the possibility of differentiating between benign and malignant testicular lesions. The testes of 20 volunteers and of 15 patients were examined in a field strength(More)