Faculty Opinions recommendation of Integrated electroanatomic mapping with three-dimensional computed tomographic images for real-time guided ablations.

Abstract Background: It is of clinical importance to examine the nasal cavity pre-operatively on surgical treatments. However, there is no simple and easy way to measure airflow in the nasal cavity. Objectives: Visualize the flow features inside the nasal cavity using computational fluid dynamics (CFD) method, and study the effect of different breathing rates on nasal function. Method: A three-dimensional nasal cavity model was reconstructed based on computed tomographic images of a healthy Malaysian adult nose. Navier-Stokes and continuity equations for steady airflow were solved numerically to examine the inspiratory nasal flow. Results: The flow resistance obtained varied from 0.026 to 0.124 Pa.s/mL at flow-rate from 7.5 L/min to 40 L/min. Flow rates by breathing had significant influence on airflow velocity and wall shear-stress in the vestibule and nasal valve region. Conclusion: Airflow simulations based on CFD is most useful for better understanding of flow phenomenon inside the nasal cavity.

Download Full-text

Three-dimensional Computed Tomographic Cranial Base Measurements for Improvement of Surgical Approaches to the Petrous Carotid Artery and Apex Regions

Neurosurgery ◽

10.1097/00006123-200108000-00016 ◽

2001 ◽

Vol 49 (2) ◽

pp. 342-353 ◽

Cited By ~ 2

Author(s):

Alan T. Villavicencio ◽

Jean-Christophe Leveque ◽

Ketan R. Bulsara ◽

Allan H. Friedman ◽

Linda Gray

Keyword(s):

Computed Tomography ◽

Carotid Artery ◽

Three Dimensional ◽

Internal Auditory Canal ◽

Cranial Base ◽

Petrous Apex ◽

Surgical Approaches ◽

Tomographic Images ◽

Computed Tomographic ◽

Preoperative Information

Abstract OBJECTIVE The bony and vascular anatomic features in the region of the petrous apex can vary significantly. These variations affect the operative view obtained via extended subtemporal or anterior transpetrosal approaches to cranial base lesions for individual patients. The goal of this study was to evaluate three-dimensional computed tomography as a means of obtaining detailed preoperative anatomic information regarding bony and vascular landmarks and spatial relationships in the region of the petrous carotid artery and petrous apex. METHODS We radiographically studied 15 patients (30 sides), using 0.8- to 1-mm-thick, reconstructed, computed tomographic images. Special attention was given to the course of the petrous carotid artery. RESULTS The petrous carotid artery was located lateral to the trigeminal impression. The size of the petrous apex medial to the horizontal petrous carotid artery was observed to be variable. The width of bone from the trigeminal impression to the wall of the internal auditory canal averaged 9.6 mm (range, 5.2–16.1 mm). A variable amount of bone overlying the internal auditory canal (4.5 mm) was also present. Multiple other relationships among key landmarks were quantified. CONCLUSION There is significant variability in the anatomic features of the petrous apex among patients. For each patient, detailed preoperative information regarding the amount of bone to be removed during a cranial base procedure can be obtained using three-dimensional computed tomography. This information may be critical for determination of the amount of extra exposure that can be achieved via an anterior petrosectomy for each patient.

Download Full-text

Three-dimensional segmentation of the tumor mass in computed tomographic images of neuroblastoma

10.1117/12.534559 ◽

2004 ◽

Cited By ~ 5

Author(s):

Hanford J. Deglint ◽

Rangaraj M. Rangayyan ◽

Graham S. Boag

Keyword(s):

Three Dimensional ◽

Tomographic Images ◽

Tumor Mass ◽

Computed Tomographic ◽

Three Dimensional Segmentation

Download Full-text

Evaluation of mandibular volume classified by vertical skeletal dimensions with cone-beam computed tomography

The Angle Orthodontist ◽

10.2319/103015-732.1 ◽

2016 ◽

Vol 86 (6) ◽

pp. 949-954 ◽

Cited By ~ 5

Author(s):

Takatoshi Nakawaki ◽

Tetsutaro Yamaguchi ◽

Daisuke Tomita ◽

Yu Hikita ◽

Mohamed Adel ◽

...

Keyword(s):

Computed Tomography ◽

Cone Beam Computed Tomography ◽

Three Dimensional ◽

Cone Beam ◽

Class Iii ◽

Tomographic Images ◽

Computed Tomographic ◽

Significant Difference ◽

Detailed Assessment ◽

Lateral Cephalometry

ABSTRACT Objective: To investigate the relationship between anteroposterior and vertical differences in maxillofacial morphology and mandibular volume. Materials and Methods: Subjects comprised 213 Japanese adults (84 males and 129 females) who were divided into three groups based on mandibular basal arch (ANB) and Wits, measured in a cephalometric analysis: Class I (−1° ≤ ANB < 4°,−1 mm ≤ Wits < 0 mm), Class II (ANB ≥ 4°, Wits ≥ 0), and Class III (ANB <−1°, Wits <−1 mm). Subjects were also divided into three groups based on the mandibular plane angle (Mp), as follows: hypodivergent (Mp < 23°), normodivergent (Mp = 23–30°), and hyperdivergent (Mp > 30°) groups. Mandibular volume was measured from cone-beam computed tomographic images that were analyzed using Analyze™ image processing software and compared among the three groups in each classification. Results: No significant differences were noted in mandibular volume among Classes I, II, and III. An inverse relationship was found between mandibular volume and Mp, and a significant difference was noted in mandibular volume between the hypodivergent and hyperdivergent groups. Conclusions: In addition to two-dimensional analysis, such as lateral cephalometry, three-dimensional information such as volume, provided by cone-beam computed tomography, contributes to a more detailed assessment of maxillofacial morphology.

Download Full-text