Kymographic imaging of laryngeal vibrations

Švec, Jan G.; Schutte, Harm K.

doi:10.1097/moo.0b013e3283581feb

Cited by 50 publications

(31 citation statements)

References 55 publications

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“…In order to create a DKG, a line perpendicular to the vocal fold axis is selected within a HSV sequence, and the corresponding video pixels on that line are successively extracted for each video frame in the analyzed sequence. The extracted lines are concatenated in time (separated by the frame rate period) to form the final graph (Švec and Schutte, 2012). The DKGs created for this manuscript were generated using a custom-written Python script (Herbst, 2012), which was run as a plug-in within the FIJI image analysis software package (Schindelin et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Glottal opening and closing events investigated by electroglottography and super-high-speed video recordings

Herbst

Lohscheller

Švec

et al. 2014

Journal of Experimental Biology

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Previous research has suggested that the peaks in the first derivative (dEGG) of the electroglottographic (EGG) signal are good approximate indicators of the events of glottal opening and closing. These findings were based on high-speed video (HSV) recordings with frame rates 10 times lower than the sampling frequencies of the corresponding EGG data. The present study attempts to corroborate these previous findings, utilizing super-HSV recordings. The HSV and EGG recordings (sampled at 27 and 44 kHz, respectively) of an excised canine larynx phonation were synchronized by an external TTL signal to within 0.037 ms. Data were analyzed by means of glottovibrograms, digital kymograms, the glottal area waveform and the vocal fold contact length (VFCL), a new parameter representing the time-varying degree of 'zippering' closure along the anterior-posterior (A-P) glottal axis. The temporal offsets between glottal events (depicted in the HSV recordings) and dEGG peaks in the opening and closing phase of glottal vibration ranged from 0.02 to 0.61 ms, amounting to 0.24-10.88% of the respective glottal cycle durations. All dEGG double peaks coincided with vibratory A-P phase differences. In two out of the three analyzed video sequences, peaks in the first derivative of the VFCL coincided with dEGG peaks, again co-occurring with A-P phase differences. The findings suggest that dEGG peaks do not always coincide with the events of glottal closure and initial opening. Vocal fold contacting and de-contacting do not occur at infinitesimally small instants of time, but extend over a certain interval, particularly under the influence of A-P phase differences.KEY WORDS: Electroglottography, dEGG double peaks, Highspeed video, Vocal fold contact length, Excised canine larynx, Glottal opening and closing events

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Section: Discussionmentioning

confidence: 99%

Glottal opening and closing events investigated by electroglottography and super-high-speed video recordings

Herbst

Lohscheller

Švec

et al. 2014

Journal of Experimental Biology

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“…Pre- and postoperative evaluation of inferior laryngeal nerve function were evaluated with video-laryngoscopy together with video-stroboscopy and video-kymography [21]. …”

Section: Methodsmentioning

confidence: 99%

Minimally Invasive Video-Assisted versus Minimally Invasive Nonendoscopic Thyroidectomy

Fík

Astl

Zábrodský

et al. 2014

BioMed Research International

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Minimally invasive video-assisted thyroidectomy (MIVAT) and minimally invasive nonendoscopic thyroidectomy (MINET) represent well accepted and reproducible techniques developed with the main goal to improve cosmetic outcome, accelerate healing, and increase patient's comfort following thyroid surgery. Between 2007 and 2011, a prospective nonrandomized study of patients undergoing minimally invasive thyroid surgery was performed to compare advantages and disadvantages of the two different techniques. There were no significant differences in the length of incision to perform surgical procedures. Mean duration of hemithyroidectomy was comparable in both groups, but it was more time consuming to perform total thyroidectomy by MIVAT. There were more patients undergoing MIVAT procedures without active drainage in the postoperative course and we also could see a trend for less pain in the same group. This was paralleled by statistically significant decreased administration of both opiates and nonopiate analgesics. We encountered two cases of recurrent laryngeal nerve palsies in the MIVAT group only. MIVAT and MINET represent safe and feasible alternative to conventional thyroid surgery in selected cases and this prospective study has shown minimal differences between these two techniques.

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“…Różnice między obiema metodami opisali Svec oraz Schutte, wskazując na wady i zalety każdej z nich [10]. Wśród zalet kimografii wykonywanej na podstawie szybkiego filmu wymienili m.in.…”

Section: Wideostrobokimografia (Svkg)unclassified

Videostrobokymography and phonovibrogram as a new methods for analysis of vocal fold vibration

Jędra¹,

Sielska-Badurek²,

Niemczyk³

2015

Polski Przegląd Otorynolaryngologiczny

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STRESZCZENIE:Współczesna foniatria dysponuje coraz nowocześniejszymi metodami, które pozwalają na dokładniejszą i obiektywniejszą ocenę drgań fonacyjnych fałdów głosowych. Poza oceną wideostroboskopową zaliczają się do nich wideostrobokimografia oraz fonowibrogram. Oba badania można wykonać na podstawie powszechnie wykonywanych nagrań wideolaryngostroboskopowych dobrej jakości.Wynikiem wideostrobokimografii są przekroje kimograficzne oraz wykresy obrazujące drgania fałdów głosowych. Umożliwiają one przede wszystkim ocenę: przesunięcia brzeżnego, drgań fonacyjnych fałdów głosowych, stosunku czasu trwania zwarć do rozwarć fonacyjnych oraz obecności i dokładnej lokalizacji ewentualnej niedomykalności.Fonowibrogram jest metodą, która za pomocą pojedynczego diagramu przedstawia kształt całej szpary głośni w trakcie drgań fonacyjnych. Uwidacznia momenty zwarć i rozwarć fonacyjnych oraz struktury, które przysłaniają światło głośni.Kimografia oraz fonowibrogram mogą być wykorzystywane w diagnostyce zaburzeń głosu o różnym podłożu czynnościowym i organicznym. Do nieprawidłowości dotyczących drgań fonacyjnych fałdów głosowych, które mogą być przedstawione za pomocą powyższych badań, zaliczają się: niejednoczasowe drgania fałdów głosowych, obecność niedomykalności fonacyjnej szpary głośni, ograniczony lub całkowity brak przesunięcia brzeżnego, a także obecność różnego rodzaju zmian organicznych zlokalizowanych na fałdach głosowych. Oba badania umożliwiają ocenę subtelnych zaburzeń drgań fonacyjnych, które nierzadko trudno dostrzec w trakcie oglądania nagrania wideolaryngostroboskopowego.Zarówno przekroje kimograficzne, jak i fonowibrogram mogą zostać wydrukowane i przechowywane w formie papierowej. Poprawne wykonanie opisanych badań oraz ich prawidłowa interpretacja stanowią wartościowe uzupełnienie klasycznej wideolaryngostroboskopii.SŁOWA KLUCZOWE: kimografia, wideostrobokimografia, fonowibrogram, wideolaryngostroboskopia, drgania fonacyjne fałdów głosowych WYKAZ SKRÓTÓW: SVKG -wideostrobokimografia, PVG -fonowibrogram ABSTRACT:Modern phoniatry is equipped with a number of increasingly more advanced technologies allowing for more precise and objective evaluation of vocal fold vibratory patterns during phonation. Aside from videostroboscopic assessment, these diagnostic methods include videostrobokymography and phonovibrography. Both examinations may be conducted based on common videolaryngostroboscopic recordings of good quality.Results of videostrobokymography are presented as kymographic cross-sections and graphs representing vocal fold vibrations. They primarily enable assessment of mucosal edge movements, phonatory vibrations, and vocal fold closingto-opening time ratio, as well as presence and precise location of possible insufficiency.artykuł poglądowy / review article

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Kymographic imaging of laryngeal vibrations

Abstract: High-speed kymography visualizes vibratory features which are not simply observable via traditional methods. It shows large potential in better understanding the functional origin of hoarseness and unsteady phonatory states. Further research in this area is envisioned.

Cited by 50 publications

References 55 publications

Glottal opening and closing events investigated by electroglottography and super-high-speed video recordings

Glottal opening and closing events investigated by electroglottography and super-high-speed video recordings

Minimally Invasive Video-Assisted versus Minimally Invasive Nonendoscopic Thyroidectomy

Videostrobokymography and phonovibrogram as a new methods for analysis of vocal fold vibration

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