Method of Individual Adjustment for 3D CT Analysis: Linear Measurement

Kim, Dong Kyu; Choi, Dong Wik; Lee, Jeong Woo; Yang, Jung Dug; Chung, Ho Yun; Cho, Byung Chae; Choi, Kang Young

doi:10.1155/2016/6893072

Cited by 4 publications

(4 citation statements)

References 25 publications

(21 reference statements)

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“…Accordingly, the ratio for each length was calculated for comparison by dividing the value of the SS, not the measured length, by the value of the LS. 12 The volume of the bilateral masticatory muscles was determined using the Aquarius iNtuition program (Ver.4.4.13.P2, TeraRecon Inc, Durham, NC) to identify the position of the temporalis, masseter, medial pterygoid, and lateral pterygoid in the axial view on the horizontal plane of 3DCT images, and the volume was measured by directly entering the muscle boundary into the program (Fig. 3).…”

Section: Methodsmentioning

confidence: 99%

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The Effect of Orthognathic Surgery on Changes in Masticatory Muscle Volume in Patients With Facial Asymmetry

Park

Ryu

et al. 2021

Journal of Craniofacial Surgery

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: The masseter muscle changes remarkably with orthognathic surgery and has a marked influence on the contours of the lower face. If the postoperative volume change of masticatory muscles, including the masseter muscles, can be predicted, it will facilitate preoperative planning and outcome prediction. This study investigated the association of masticatory muscle volume according to the presence or absence of facial asymmetry, and evaluated whether the volume of masticatory muscles, including that of the masseter muscle, changes after orthognathic surgery in facial asymmetry patients. Twenty patients who underwent LeFort I osteotomy and bilateral sagittal segmentation ramus osteotomy (BSSRO) with facial asymmetry between 2011 and 2017 were assigned to the asymmetric group. Additionally, 207 patients with a simple nasal fracture between 2016 and 2019 were included as the common group. Threedimensional computed tomography images were retrospectively analyzed and compared between the asymmetric group and common group. The volume of both temporal and masseter muscles differed according to facial asymmetry, with the asymmetry in the muscle volume increasing in proportion to the degree of facial asymmetry. The difference in masseter volume on the shortened and lengthened sides was significantly reduced after orthognathic surgery, but a difference of about 1 cm3 remained. Additionally, the masticatory muscle volume on the lengthened side tended to be decreased more than that on the shortened side. Consideration of the postoperative change in the volume of the masticatory muscles may be helpful in planning orthognathic surgery in facial asymmetry patients.

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Section: Methodsmentioning

confidence: 99%

“…Accordingly, the ratio for each length was calculated for comparison by dividing the value of the SS, not the measured length, by the value of the LS. 12…”

Section: Methodsmentioning

confidence: 99%

The Effect of Orthognathic Surgery on Changes in Masticatory Muscle Volume in Patients With Facial Asymmetry

Park

Ryu

et al. 2021

Journal of Craniofacial Surgery

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“…In this study,the computed tomographywas used because it is an accurate imaging modality.Inherent high-contrast resolution of computed tomographyled to a distinction between tissues that differ in the physical density by less than 1%;while a distinction between tissues in conventional radiography requires a 10% difference in the physical density (17)In contrast to 2D cephalometric radiography, three dimensionalcomputed tomography gave accurate values for angular measurements (18). Distortion and magnificationare the major disadvantages of panoramic imageslimiting the dimensional accuracy (19).…”

Section: Discussionmentioning

confidence: 99%

Effect of Age and Gender on Gonial Angle and Mandibular Canal in CI Ι Malocclusion and Study their Relationship Using CT Scan

Atallah¹,

Al-Fadhily²,

Hameed³

et al. 2020

ATMPH

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The aim of this study is to evaluate the effect of age and gender on gonial angle and mandibular canal and to see if there is a relationship between them. Additionally, estimation ofthe gonial angle and position of mandibular canal.Materials and method:Computed tomographic images of 72 subjects were analyzed and divided into two groups, group I, age (14-35) years consisting of 18 males and 18 females and group II, age (36-60) years consisting of 18 males and 18 females. The gonial angle and the distance between the most inferior border of the inferior alveolar canal and the lower border of the mandible were measured.Results: There were no statistically significant differences in the gonial angle and the inferior alveolar canal measurements between groups Ι and ΙΙ in both males and females. There was a statistically significant difference between males and females in the gonial angle measurements and the females tended to show greater mean value (126.66) than males (123.94).On the contrary there was no statistically significant difference between them in the inferior alveolar canal measurements.There was a positive significant correlationbetween the gonial angle and the inferior alveolar canal measurements.Conclusion: Gonial angle was affected by gender but not by age. The measurement from inferior alveolar canal to the lower border of mandible not affected by age and gender. There is a positive significant correlationbetween the gonial angle and the inferior alveolar canal measurements.

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“…Measurement with CT may vary because of tilt vibration resulting from changes in the posture of patients or varied positions of the elbow inside the machine [19]. Thus, an arm support system was prepared for the capturing of images in all patients, ensuring consistent positioning inside the CT machine; adjustments were made for consistency with the posture during x-ray imaging of the cubital tunnel.…”

Section: Imaging Techniques Patient Positioningmentioning

confidence: 99%

Validity of computed tomographic measurements and morphological comparison of cubital tunnel in idiopathic cubital tunnel syndrome

Lee

Hwang

Choy

2020

BMC Musculoskelet Disord

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Background: Ulnar neuropathy is a common reason for referral to hand surgeons, and 10 to 30% of cubital tunnel syndrome (CuTS) is idiopathic. We hypothesized that the cause of idiopathic CuTS is in the bony structure. Methods: We analyzed 79 elbows (39 idiopathic CuTS and 40 without CuTS symptom) using computed tomography and Materialize Mimics software to compare the differences between the two groups. We proposed a new bony cubital tunnel with a new boundary that could play a role in ulnar nerve compression symptom. Results: The mean cubital tunnel volume was 1245.6 mm 3 in all patients, 1180.6 mm 3 in CuTS patients, and 1282.3 mm 3 in the control group. A significant difference (p = 0.015) between two groups was found. Bony cubital tunnel cross-sectional area, cubital tunnel depth, and cubital tunnel angle also showed significant differences. Conclusion: The shape of the bony cubital tunnel is an important cause of CuTS, and the normal variation of the volume and cross-sectional area of the cubital tunnel and cubital tunnel angle could influence the occurrence of idiopathic CuTS.

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Method of Individual Adjustment for 3D CT Analysis: Linear Measurement

Cited by 4 publications

References 25 publications

The Effect of Orthognathic Surgery on Changes in Masticatory Muscle Volume in Patients With Facial Asymmetry

The Effect of Orthognathic Surgery on Changes in Masticatory Muscle Volume in Patients With Facial Asymmetry

Effect of Age and Gender on Gonial Angle and Mandibular Canal in CI Ι Malocclusion and Study their Relationship Using CT Scan

Validity of computed tomographic measurements and morphological comparison of cubital tunnel in idiopathic cubital tunnel syndrome

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