Frank Gottwald

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OBJECTIVE Histology of parotid tumors determines the extent of surgery. The aim was to test ultrasound (US) contrast enhancer-kinetics to identify histologic entities, possibly being superior to qualitative morphological parameters. STUDY DESIGN In a cross-sectional assessment of ultrasound diagnosis, the subjective US-classification was compared with(More)
OBJECTIVE Cysts of the thoracic duct located in the supraclavicular region are uncommon. To date only 12 cases in this topographic area have been described in the literature. Between 1998 and 2002, 5 patients presented to our department with the primary symptom of a palpable soft left-supracavicular swelling that could be displaced relative to adjacent(More)
Several criteria in B-scan and colour-coded Doppler ultrasound have been shown to discriminate malignant transformation of cervical lymph nodes. All these parameters tend to be operator dependent. We describe the first use of computer-assisted analysis of contrast-enhanced ultrasound images evaluating cervical lymphadenopathy in differentiation between(More)
The use of extracorporeal shock waves in the treatment of submandibular stones is a minimally invasive approach for the treatment of this disease. Its clinical significance has been determined in a long-term retrospective study, performed as follow-up to the short-term results. From 1989 to 1994, 197 patients (88 female, 109 male; age range, 8 to 83 years)(More)
A system for the computerized differentiation of parotid gland tumors is proposed. The parotid gland is the largest of the salivary glands. It is found in the subcutaneous tissue of the face, overlying the mandibular ramus and anterior and inferior to the external ear. The classification system is based on a multifeature tissue characterization approach,(More)
In this paper results from a clinical study on differentiating between various types of parotid gland tumors using computerized tissue characterization (Sonohistology) are presented. Complex baseband ultrasound data have been acquired during the common examinations of patients who were scheduled to have parotid surgery shortly after the acquisition. Data of(More)
The first ultrasonic tissue characterization system for the computerized differentiation of tumors of the parotid gland is presented. The system is based on a multifeature tissue characterization approach involving spectrum and texture parameters and using fuzzy inference systems as higher order classifiers. Baseband ultrasound echo data were acquired(More)
Neurological impairment during pregnancy is also commonly found in otorhinolaryngology. Cranial nerve palsy, e.g. of the facial nerve or changes in signal processing of the hearing system, are described. Apart from changes in electrolyte balance, these neurological alterations are attributed to hormone fluctuations. The spontaneous remission of the(More)
OBJECTIVE The Hoarseness Diagram, a program for voice quality analysis used in German-speaking countries, was compared with an automatic speech recognition system with a module for prosodic analysis. The latter computed prosodic features on the basis of a text recording. We examined whether voice analysis of sustained vowels and text analysis correlate in(More)