Ultrasound imaging of the larynx and vocal folds

Tsui, Po-Hsiang; Wan, Yung-Liang; Chen, Chin‐Kuo

doi:10.1097/moo.0b013e32835896b4

Cited by 32 publications

(24 citation statements)

References 41 publications

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“…The backscattered statistics of ultrasound echoes measured from biological tissues can be classified as pre-Rayleigh, Rayleigh, and post-Rayleigh distributions 30 . The Nakagami distribution fits well with these three distributions.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of muscular changes by ultrasound Nakagami imaging in Duchenne muscular dystrophy

Weng

Tsui

Lin

et al. 2017

Sci Rep

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Duchenne muscular dystrophy (DMD) is the most common debilitating muscular disorder. Developing a noninvasive measure for monitoring the progression of this disease is critical. The present study tested the effectiveness of using ultrasound Nakagami imaging to evaluate the severity of the dystrophic process. A total of 47 participants (40 with DMD and 7 healthy controls) were recruited. Patients were classified into stage 1 (presymptomatic and ambulatory), stage 2 (early nonambulatory), and stage 3 (late nonambulatory). All participants underwent ultrasound examinations on the rectus femoris, tibialis anterior, and gastrocnemius. The results revealed that the ultrasound Nakagami parameter correlated positively with functional severity in the patients with DMD. The median Nakagami parameter of the gastrocnemius muscle increased from 0.50 to 0.85, corresponding to the largest dynamic range between normal and stage 3. The accuracy, sensitivity, and specificity of diagnosing walking function were 85.52%, 76.31%, and 94.73%, respectively. The Nakagami parameter of the rectus femoris and gastrocnemius muscles correlated negatively with the 6-minute walking distance in the ambulatory patients. Therefore, changes in the Nakagami parameter for the gastrocnemius muscle are suitable for monitoring disease progression in ambulatory patients and for predicting ambulation loss. Ultrasound Nakagami imaging shows potential for evaluating patients with DMD.

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Section: Methodsmentioning

confidence: 99%

Evaluation of muscular changes by ultrasound Nakagami imaging in Duchenne muscular dystrophy

Weng

Tsui

Lin

et al. 2017

Sci Rep

Self Cite

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“…Echo amplitude distribution measured from tissues can be classified as Rayleigh, pre-Rayleigh, and post-Rayleigh distributions27. The variation of the Nakagami parameter from 0 to 1 corresponds to a change in the echo amplitude distribution from the pre-Rayleigh to Rayleigh distribution; Nakagami parameters higher than 1 indicate that the statistics of the echo amplitude conform to the post-Rayleigh distribution15.…”

Section: Methodsmentioning

confidence: 99%

“…In brief, (i) The envelope image was obtained using the absolute value of the Hilbert Transform of each echo signal filtered using empirical mode decomposition28; (ii) A square window within the envelope image was used to collect local amplitude data for estimating the Nakagami parameter, which is assigned as the new pixel located in the center of the window. The side length of the window was three times the pulse length of the transducer1424252729. The maximum likelihood estimator (MLE) derived by Greenwood30 was selected to calculate the Nakagami parameter because MLE yields a lower variance in estimating the Nakagami parameter313233.…”

Section: Methodsmentioning

confidence: 99%

Acoustic structure quantification by using ultrasound Nakagami imaging for assessing liver fibrosis

Tsui

Tai

et al. 2016

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Acoustic structure quantification (ASQ) is a recently developed technique widely used for detecting liver fibrosis. Ultrasound Nakagami parametric imaging based on the Nakagami distribution has been widely used to model echo amplitude distribution for tissue characterization. We explored the feasibility of using ultrasound Nakagami imaging as a model-based ASQ technique for assessing liver fibrosis. Standard ultrasound examinations were performed on 19 healthy volunteers and 91 patients with chronic hepatitis B and C (n = 110). Liver biopsy and ultrasound Nakagami imaging analysis were conducted to compare the METAVIR score and Nakagami parameter. The diagnostic value of ultrasound Nakagami imaging was evaluated using receiver operating characteristic (ROC) curves. The Nakagami parameter obtained through ultrasound Nakagami imaging decreased with an increase in the METAVIR score (p < 0.0001), representing an increase in the extent of pre-Rayleigh statistics for echo amplitude distribution. The area under the ROC curve (AUROC) was 0.88 for the diagnosis of any degree of fibrosis (≥F1), whereas it was 0.84, 0.69, and 0.67 for ≥F2, ≥F3, and ≥F4, respectively. Ultrasound Nakagami imaging is a model-based ASQ technique that can be beneficial for the clinical diagnosis of early liver fibrosis.

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“…US has been used to successfully evaluate vocal cord masses and abnormal vocal cord movements associated with vocal cord paralysis. 58 Hu et al 28 demonstrated good intra- and interrater reliability (0.723-0.943 and 0.736-0.903 intraclass correlation coefficients, respectively) measurements of the length, width, and thickness of the true and false vocal cords. To date, there have not been any published studies evaluating the ability of sports US to accurately and reproducibly diagnose VCD in athletes.…”

Section: Sonographic Evaluation For Vocal Cord Dysfunctionmentioning

confidence: 98%

Sports Ultrasound

Finnoff

Ray

Corrado

et al. 2016

Sports Health: A Multidisciplinary Approach

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Background:Traditionally, ultrasound has been used to evaluate musculoskeletal injuries in athletes; however, ultrasound applications extend well beyond musculoskeletal conditions, many of which are pertinent to athletes.Evidence Acquisition:Articles were identified in PubMed using the search terms ultrasound, echocardiogram, preparticipation physical examination, glycogen, focused assessment with sonography of trauma, optic nerve, and vocal cord dysfunction. No date restrictions were placed on the literature search.Study Design:Clinical review.Level of Evidence:Level 4.Results:Several potential applications of nonmusculoskeletal ultrasound in sports medicine are presented, including extended Focused Assessment with Sonography for Trauma (eFAST), limited echocardiographic screening during preparticipation physical examinations, assessment of muscle glycogen stores, optic nerve sheath diameter measurements in athletes with increased intracranial pressure, and assessment of vocal cord dysfunction in athletes.Conclusion:Ultrasound can potentially be used to assist athletes with monitoring their muscle glycogen stores and the diagnosis of multiple nonmusculoskeletal conditions within sports medicine.

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Ultrasound imaging of the larynx and vocal folds

Abstract: Future clinical applications could combine conventional B-mode and Nakagami images to allow physicians to simultaneously evaluate the morphology and scatterer properties of laryngeal tissues.

Cited by 32 publications

References 41 publications

Evaluation of muscular changes by ultrasound Nakagami imaging in Duchenne muscular dystrophy

Evaluation of muscular changes by ultrasound Nakagami imaging in Duchenne muscular dystrophy

Acoustic structure quantification by using ultrasound Nakagami imaging for assessing liver fibrosis

Sports Ultrasound

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