Spatio-temporal quantification of vocal fold vibrations using high-speed videoendoscopy and a biomechanical model

Pathologic changes within the organic constitution of vocal folds or a functional impairment of the larynx may result in disturbed or even irregular vocal fold vibrations. The consequences are perturbations of the acoustic speech signal which are perceived as a hoarse voice. By means of appropriate image processing techniques, the vocal fold dynamics are extracted from digital high-speed videos. This study addresses the approach to obtain a parametric description of the spatio-temporal characteristics of the vocal fold oscillations for the aim of classification. For this purpose a biomechanical vocal fold model is introduced. An automatic optimization procedure is developed for fitting the model dynamics to the observed vocal fold oscillations. Thus, the resulting parameter values represent a specific vibration pattern and serve as an objective quantification measure. Performance and reliability of the optimization procedure are validated with synthetically generated data sets. The high-speed videos of two normal voice subjects and six patients suffering from different voice disorders are processed. The resulting model parameters represent a rough approximation of physiological parameters along the entire vocal folds.

[Use of adaptive devices by laryngectomees]

AIMS

This study is directed at the following questions: How many laryngectomees are using which adaptive devices how often? Which devices are they lacking? Which alaryngeal voice has the best results in terms of intelligibility?

METHODS

218 patients operated on in 6 ENT-clinics in Eastern Germany over the last 25 years were interviewed in person. Items from a German questionnaire for psychosocial adjustment after laryngectomy (FPAL) and from the quality of life questionnaire EORTC QLQ-H&N35 were used. Voice intelligibility was measured by an objective test, the Postlaryngectomy-Telephone-Intelligibility-Test (PLTT).

RESULTS

The most common communication method in this group is the esophageal voice, only 20% use voice prostheses regularly, and 15% of the patients use electronic devices. 87% of the laryngectomees wear scarves to protect their stoma, and 82% use inhalers. Several patients lack tools for communication, some for protection of the tracheostoma and others devices for showering and swimming. The best speech results are gained with voice prostheses. Health related Quality of Life shows only poor correlation with the use of adaptive devices.

CONCLUSION

In general the health care for laryngectomees in terms of device use can be seen as relatively good but not as optimal. Problematic is the fact that 15.5% of the patients could not acquire an adequate voice, that some devices are missed by patients despite the fact that they are available for purchase, and that some patients do not care for their tracheostoma. It could be useful to consider these findings within medical consultations.

Spatiotemporal classification of vocal fold dynamics by a multimass model comprising time-dependent parameters

A model-based approach is proposed to objectively measure and classify vocal fold vibrations by left-right asymmetries along the anterior-posterior direction, especially in the case of nonstationary phonation. For this purpose, vocal fold dynamics are recorded in real time with a digital high-speed camera during phonation of sustained vowels as well as pitch raises. The dynamics of a multimass model with time-dependent parameters are matched to vocal fold vibrations extracted at dorsal, medial, and ventral positions by an automatic optimization procedure. The block-based optimization accounts for nonstationary vibrations and compares the vocal fold and model dynamics by wavelet coefficients. The optimization is verified with synthetically generated data sets and is applied to 40 clinical high-speed recordings comprising normal and pathological voice subjects. The resulting model parameters allow an intuitive visual assessment of vocal fold instabilities within an asymmetry diagram and are applicable to an objective quantification of asymmetries.

Registration of PE segment contour deformations in digital high-speed videos

Oncologic therapy of laryngeal cancer may necessitate a total excision of the larynx which results in loss of voice. Voice rehabilitation can be achieved using mucosal tissue vibrations at the upper part of the esophagus which serves as substitute voice generating element (PE segment). The quality of the substitute voice is closely related to vibratory characteristics of the PE segment. By means of a high-speed camera the dynamics of the PE segment can be recorded in real-time. Using image processing the deformations of the PE segment are extracted from the image series as deforming contours. Commonly, the characterization of PE dynamics bases on the spectral analysis of the time varying contour area. However, this constitutes an integral approach which masks most of the specific dynamics of PE deformations. We present an algorithm that automatically registers one segmented contour in a frame of the video sequence to the contour in the next frame to derive discrete 2-D trajectories of PE vibrations. By concatenation of the obtained transformations this approach provides a total registration of PE segment contours. We suggest a mixed-integer programming formulation for the problem that combines an advanced outlier and deformation handling with the introduction of dummy points in regions that newly open up, and that includes normal information in the objective function to avoid unwanted deformations. Numerical experiments show that the implemented alternate convex search algorithm produces robust results which is demonstrated at the example of five high-speed recordings of laryngectomee subjects.

Two novel mutations in the GDAP1 and PRX genes in early onset Charcot-Marie-Tooth syndrome

Autosomal recessive Charcot-Marie-Tooth syndrome (AR-CMT) is often characterised by an infantile disease onset and a severe phenotype. Mutations in the ganglioside-induced differentiation-associated protein 1 (GDAP1) gene are thought to be a common cause of AR-CMT. Mutations in the periaxin (PRX) gene are rare. They are associated with severe demyelination of the peripheral nerves and sometimes lead to prominent sensory disturbances. To evaluate the frequency of GDAP1 and PRX mutations in early onset CMT, we examined seven AR-CMT families and 12 sporadic CMT patients, all presenting with progressive distal muscle weakness and wasting. In one family also prominent sensory abnormalities and sensory ataxia were apparent from early childhood. In three families we detected four GDAP1 mutations (L58LfsX4, R191X, L239F and P153L), one of which is novel and is predicted to cause a loss of protein function. In one additional family with prominent sensory abnormalities a novel homozygous PRX mutation was found (A700PfsX17). No mutations were identified in 12 sporadic cases. This study suggests that mutations in the GDAP1 gene are a common cause of early-onset AR-CMT. In patients with early-onset demyelinating AR-CMT and severe sensory loss PRX is one of the genes to be tested.

Häufigkeit psychischer Begleiterkrankungen und der Wunsch nach psychosozialer Unterstützung bei Tumorpatienten im Akutkrankenhaus

BACKGROUND AND OBJECTIVE

A diagnosis of cancer can overpower a patient's ability to cope and thus can increase the prevalence of psychiatric disorders in this group of patients. It was the aim of this study to estimate that prevalence in tumor patients during their acute treatment.

PATIENTS AND METHODS

689 patients with malignancies were interviewed using the structure clinical interview connected with the Diagnostic and Statistical Manual of Mental Disorders IV [SCID]) DSM-IV during their first days of inpatient treatment. The patients' wishes for psychosocial support by the oncological team were assessed.

RESULTS

32 % of the patients were diagnosed having a psychiatric disorder, e. g. depression. Prevalence was greater among female and/or young patients, those who had little money, were receiving chemotherapy and those who had not yet been diagnosed with cancer but in whom it was suspected. Some types of tumor were more likely to be associated with a mental disorder, for instance gynecological and head-and-neck malignancies. 83 % of the patients asked for psychosocial help from the treating physician, 44 % from the social worker, 30 % from the clinical psychologist, and 8 % from a spiritual adviser. Support was especially needed by patients who felt sad or depressed, and in those who lacked social support: these needs were unrelated to tumor stage and time since diagnosis.

CONCLUSIONS

Inpatient cancer patients frequently suffer from a psychiatric disorder. The majority of them would like to get psychosocial support, especially from their treating physician. It should be recognized that it is not only palliative care patients with advanced disease who need psychosocial treatment and support.

Bedeutung psychosozialer Faktoren bei der Stimmrehabilitation nach Laryngektomie

BACKGROUND

Often it is assumed that psychosocial and sociodemographic factors cause the success of voice rehabilitation after laryngectomy. Aim of this study was to analyze the association between these parameters.

METHODS

Based on tumor registries of six ENT-clinics all patients were surveyed, who were laryngectomized in the years before (N = 190). Success of voice rehabilitation has been assessed as speech intelligibility measured with the postlaryngectomy-telephone-intelligibility-test. For the assessment of the psychosocial parameters validated and standardized instruments were used if possible. Statistical analysis was done by multiple logistic regression analysis.

RESULTS

Low speech intelligibility is associated with reduced conversations (OR 0.970) and social activity (OR 1.049). Patients are more likely to talk with esophageal voice when their motivation for learning the new voice was high (OR 7.835) and when they assessed their speech therapist as important for their motivation (OR 4.794). The risk to communicate merely by whispering is higher when patients live together with a partner (OR 5.293), when they talk seldomly (OR 1.017) and when they are not very active in social contexts (OR 0.966).

CONCLUSIONS

Psychosocial factors can only partly explain how voice rehabilitation after laryngectomy becomes a success. Speech intelligibility is associated with active communication behaviour, whereas the use of an esophageal voice is correlated with motivation. It seems that the gaining of tracheoesophageal puncture voice is independent of psychosocial factors.

[Requirements and performance profile of the Paediatric Radiation Oncology Working Group (APRO): evaluation of the present situation and description of future developments]

BACKGROUND

Radiation therapy is an integral component in the management of childhood malignancies and undergoes a continuous process of optimization within the prospective trials of the GPOH. At present there are approximately 20 active protocols, some specifying radio-oncological study questions, in which about 500 to 600 children annually are given radiotherapy.

MATERIALS/METHODS

The Pediatric Radiation Oncology Working Group (APRO) of the German Society for Radiation Oncology (DEGRO) represents the organizational link between GPOH and DEGRO. Their activities range from phrasing guidelines of radio-oncological therapy, through writing a protocol for a prospective study on radiation-induced late effects (RISK--in co-operation with GPOH, 695 patients registered so far) and organizing meetings for information transfer, to implementing radio-oncology within the prospective studies of the GPOH by establishing study chairs for radio-oncology when radio-oncological questions are a primary focus and/or to function as a reference institution for quality assurance. These activities also include individual case consultations outside the study proper. Twice annually the members of the APRO meet for an update on current knowledge and future directions where a representative of the GPOH is invited to contribute special aspects of pediatric oncology.

CONCLUSIONS

In the future, modern technology (intensity modulated radiotherapy, proton therapy, inclusion of imaging in treatment planning) will be part of disease management in pediatric oncology. A working group for modern radiotherapy technology was established to enhance this development. Prospective studies of the GPOH with primary or secondary radio-oncological questions require the implementation of corresponding tasks (documentation, monitoring, etc.) in order to meet future demands on clinical trials and to achieve the aims of the protocol. Consequently adequate financial support is indispensable.

Medizinische Entscheidungsfindung im Krankenhaus - Ergebnisse einer explorativen Studie zum Stellenwert des shared decision making aus der Sicht der Ärzte

The changes in the relationship between doctors and patients and the transfer of shared decision making into medical treatment has often been discussed. The role and the perspective of the patients are primarily described. The aim of our study is to examine the attitudes of physicians regarding the shared decision making concept, based on 15 interviews with clinical doctors. Our findings show that most doctors know the content of the concept and mostly agree with it. Practical barriers for the realisation of shared decision making are often stressed. The meaning of the concept of shared decision making for the physicians is in some respects different from the meaning of this concept for the patients. It is important to examine this concept more particularly with standardised instruments. It will be necessary to explore not only the role of patients and physicians in the medical decision making process but also the position of other relevant persons like the relatives of the patients or the nursing staff.

Model-based classification of nonstationary vocal fold vibrations

Classification of vocal fold vibrations is an essential task of the objective assessment of voice disorders. For historical reasons, the conventional clinical examination of vocal fold vibrations is done during stationary, sustained phonation. However, the conclusions drawn from a stationary phonation are restricted to the observed steady-state vocal fold vibrations and cannot be generalized to voice mechanisms during running speech. This study addresses the approach of classifying real-time recordings of vocal fold oscillations during a nonstationary phonation paradigm in the form of a pitch raise. The classification is based on asymmetry measures derived from a time-dependent biomechanical two-mass model of the vocal folds which is adapted to observed vocal fold motion curves with an optimization procedure. After verification of the algorithm performance the method was applied to clinical problems. Recordings of ten subjects with normal voice and ten dysphonic subjects have been evaluated during stationary as well as nonstationary phonation. In the case of nonstationary phonation the model-based classification into "normal" and "dysphonic" succeeds in all cases, while it fails in the case of sustained phonation. The nonstationary vocal fold vibrations contain additional information about vocal fold irregularities, which are needed for an objective interpretation and classification of voice disorders.

Classification of unilateral vocal fold paralysis by endoscopic digital high-speed recordings and inversion of a biomechanical model

Hoarseness in unilateral vocal fold paralysis is mainly due to irregular vocal fold vibrations caused by asymmetries within the larynx physiology. By means of a digital high-speed camera vocal fold oscillations can be observed in real-time. It is possible to extract the irregular vocal fold oscillations from the high-speed recordings using appropriate image processing techniques. An inversion procedure is developed which adjusts the parameters of a biomechanical model of the vocal folds to reproduce the irregular vocal fold oscillations. Within the inversion procedure a first parameter approximation is achieved through a knowledge-based algorithm. The final parameter optimization is performed using a genetic algorithm. The performance of the inversion procedure is evaluated using 430 synthetically generated data sets. The evaluation results comprise an error estimation of the inversion procedure and show the reliability of the algorithm. The inversion procedure is applied to 15 healthy voice subjects and 15 subjects suffering from unilateral vocal fold paralysis. The optimized parameter sets allow a classification of pathologic and healthy vocal fold oscillations. The classification may serve as a basis for therapy selection and quantification of therapy outcome in case of unilateral vocal fold paralysis.

[Success and failure in interdisciplinary studies]

The Association of Uro-genital Oncology (AUO) and the Association of Radiological Oncology (ARO) proceeded three studies on the indication of prostate cancer within the last 10 years. In this article, one of the leading study investigators is presenting determines on success or failure of this interdisciplinary studies.

Patienten nach Prostatektomie

BACKGROUND

Prostate carcinoma patients (PCP) with mental disorders suffer frequently from a decreased quality of life (QOL) and often need psychooncological treatment (PTN). To meet that need, the extent of treatment required should be determined and a reliable identification routine implemented.

METHODS

A total of 103 PCP were interviewed with a validated instrument (SCID) during urological inpatient treatment to assess mental disorders of PTN, and questionnaires were administered to examine QOL (QLQ-C30) and mental stress (HADS); 17 doctors and 23 nurses assessed their patients' PTN.

RESULTS

Twenty percent of the patients had a PTN which was identified by doctors and nurses in 50% of the cases and by HADS in up to 84%. Even 1 year after treatment, the QOL of patients with PTN was diminished, while patients without recovered remarkably better.

CONCLUSION

Patients with PTN should be detected as a matter of routine, e.g., using the HADS, and treated early.