Three-dimensional segmentation of the upper airway using cone beam CT: a systematic review

Objective: Obstructive Sleep Apnea (OSA) occurs by recurrent collapse of the upper airway during sleep. It results in complete (apnea) or partial (hypopnea) reduction of airflow and has intimate relation with the upper airway anatomy. Cephalometric analysis has been used to quantify airway dimensions. The aim of this study is evaluate the correlation between the anteroposterior dimension of the upper airway and the severity of obstructive sleep apnea. Material and Methods: A retrospective analysis was performed reviewing polysomnographic data (AHI) and anteroposterior cephalometric measurements of pharynx subregions: nasopharynx, oropharynx, hypopharynx. Results: The sample consisted of 30 patients. The mean body mass index was 29.60 kg/m2 and the average age was 46.8 years. Nine patients presented severe OSA, seven had moderate OSA , seven had mild OSA, and seven were healthy. The Pearson's correlation index between the anteroposterior dimension of the nasopharynx, oropharynx and hypopharynx and AHI was respectively -0.128 (p=0.517), -0.272 (p=0.162) and -0.129 (p=0.513). Conclusion: The correlation between anteroposterior linear dimension of the airway and OSA severity, assessed by AHI, was not positive. As an isolated parameter it did not correlate to the severity of the obstrucive sleep apnea syndrome and should be evaluated in conjunction with other factors. KeywordsUpper Airway; Obstructive sleep apnea; Cone beam CT.

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Improvement of Image Quality of Cone-beam CT Images by Three-dimensional Generative Adversarial Network

10.1109/embc46164.2021.9629952 ◽

2021 ◽

Author(s):

Takumi Hase ◽

Megumi Nakao ◽

Keiho Imanishi ◽

Mitsuhiro Nakamura ◽

Tetsuya Matsuda

Keyword(s):

Image Quality ◽

Cone Beam Ct ◽

Three Dimensional ◽

Ct Images ◽

Cone Beam ◽

Generative Adversarial Network ◽

Adversarial Network

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The correlation between the three-dimensional radiolucency area around the crown of impacted maxillary canines and dentigerous cysts

Dentomaxillofacial Radiology ◽

10.1259/dmfr.20190402 ◽

2020 ◽

Vol 49 (4) ◽

pp. 20190402

Author(s):

Junliang Chen ◽

Dongmei Lv ◽

MingXia Li ◽

Wei Zhao ◽

Yun He

Keyword(s):

Cone Beam Ct ◽

Dentigerous Cyst ◽

Three Dimensional ◽

Cone Beam ◽

Hard Tissue ◽

Mean Values ◽

Dentigerous Cysts ◽

Impacted Canine ◽

The Mean ◽

Surgical Operations

This study aimed to reveal the correlation between the radiolucency area around the crown of impacted maxillary canines and dentigerous cysts using cone beam CT (CBCT). CBCT data were obtained from patients with impacted maxillary canines. Three points of five areas (tooth cusp area and buccal, lingual, mesial and distal areas of the crown) were randomly selected, and the distance between the point and the surrounding hard tissue was measured respectively. The mean values were recorded as the radiolucency area. These results were compared with the occurrence of dentigerous cysts during surgery. 58 patients with 76 impacted maxillary canines were included. 14 of the 76 impacted canines were accompanied by cysts (18.42%). With the increase in the thickness of the radiolucency area, the incidence of cysts was significantly increased (p < 0.05). No cysts were found in the compacted canines with 0–1 mm thickness of the radiolucency area. The highest incidence (71.43%) was observed in canines with 3–4 mm thickness of the radiolucency area. This study found that the thickness of the radiolucency area around the crown of the maxillary impacted canine was closely related to the occurrence of dentigerous cysts. CBCT can be used to estimate the occurrence possibility of dentigerous cyst and guide surgical operations.

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